123 results on '"Mee-Koy Chin"'
Search Results
52. Transmission properties and application of a two-ring one-bus building block
- Author
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Mee-Koy Chin, Roel Baets, Pieter Dumon, Landobasa Yosef Mario, and S. Darmawan
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Finesse ,Materials science ,Mathematics::Commutative Algebra ,Nanoelectronics ,Bistability ,Transmission (telecommunications) ,Simple (abstract algebra) ,Topology ,Ring (chemistry) ,Intensity (heat transfer) ,Block (data storage) - Abstract
We propose and demonstrate a simple one-bus two-ring configuration where the two rings are mutually coupled that has advantages over the one-ring structure. Unlike a one cavity system, it can exhibit near critically-coupled transmission with a broader range of loss. It can also significantly enhance the cavity finesse by simply making the second ring twice the size of the bus-coupled one, with the enhancement proportional to the intensity buildup in the second ring. A ring structure with high finesse has many potential applications, one of which, in bistability switching, is discussed.
- Published
- 2008
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53. Box-like filter response of two-dimensional array of microring resonator fabricated in silicon-on-insulator technology
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Pieter Dumon, Landobasa Y. M. Tobing, Mee-Koy Chin, and Roel Baets
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Resonator ,Materials science ,business.industry ,Bandwidth (signal processing) ,Optoelectronics ,Silicon on insulator ,Integrated optics ,business ,Optical filter ,USable ,Photonic crystal ,Photonic bandgap - Abstract
We show theoretically and demonstrate experimentally that box-like response can be obtained using 2D arrays of microring resonator. The box-like response is manifested from the complementary photonic bandgap properties of the column and row configurations. The observed sidelobe suppression is ~10 dB, while the usable bandwidth can be as high as 500 to 750 GHz.
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- 2008
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54. Design and fabrication of high-performance InGaAsP/InP electroabsorption modulator
- Author
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Desmond C.S. Lim, Hua Yang, Jingtao Zhou, Weixi Chen, Shuh-Ying Lee, Mee Koy Chin, Hongliang Zhu, and Yuanbing Cheng
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Fabrication ,Optical fiber ,Materials science ,Coupling loss ,business.industry ,Bandwidth (signal processing) ,Optical communication ,Physics::Optics ,Waveguide (optics) ,law.invention ,Optics ,law ,Optical cavity ,business ,Quantum well - Abstract
Electroabsorption modulator has been widely used in modern optical fiber communication system and analog RF link system. In this paper, the design of a high-performance EAM with low coupling loss, high saturation power and high speed was demonstrated, which include the waveguide, active core and electrodes. A novel EAM with large optical cavity (LOC) waveguide structure, intrastep quantum well (IQW) active core and traveling wave electrodes was presented and fabricated successfully. Our results show that the LOC waveguide effectively improved the optical profile of EAM and reduced the coupling loss. The obtained traveling wave EAM achieved 21dBm saturation power and 23GHz 3-dB bandwidth.
- Published
- 2007
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55. Finesse Enhancement with Two-Ring Resonator Structure
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Landobasa Yosef Mario, Mee-Koy Chin, and Desmond Lim
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Physics ,Mathematics::Commutative Algebra ,business.industry ,Structure (category theory) ,Physics::Optics ,Silicon on insulator ,Resonance ,Slow light ,Ring (chemistry) ,Resonator ,Finesse ,Optics ,Interference (communication) ,Optoelectronics ,business ,Computer Science::Databases - Abstract
We theoretically demonstrate that a simple two-ring resonator structure can have significantly larger finesse than the single-ring case.
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- 2007
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56. Design of a single mesa vertical coupler
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Mee-Koy Chin, Shuh-Ying Lee, and Chee-Wei Lee
- Subjects
Optical fiber ,Materials science ,business.industry ,Single-mode optical fiber ,Photodetector ,Optical polarization ,Polarization (waves) ,law.invention ,Optics ,law ,Direct coupling ,Hybrid coupler ,business ,Waveguide - Abstract
A new design of vertical coupler (VC) based on only a single mesa is presented. The newly proposed vertical coupler has the potential of improving the fabrication yield, as it requires much simpler fabrication process. The vertical coupler comprises a large underlying rib waveguide to which light is coupled. The lower waveguide is formed by the loading effect provided by the smaller upper ridge waveguide. The upper ridge waveguide contains the actual device (e.g. modulator or photodetector) and is tapered in a way to maximize the vertical transfer of light from the lower waveguide, and thus the vertical coupler can be used as a spot-size converter (SSC) between a single-mode fiber and the actual device.. We investigate the transfer efficiency of the single-mesa vertical coupler with different configurations. The single-mesa design is found to give a lower total loss (i.e., fiber coupling loss plus transfer loss) compared with direct coupling to the actual device. The transfer efficiencies obtained are more than 90% for both TE and TM polarizations, and are polarization independent.
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- 2006
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57. Polymeric Optical Splitter Based on Multimode Interference Mechanism
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Shuh-Ying Lee, Norazan Mohd. Kassim, M. Haniff, Mee-Koy Chin, and Abu Bakar Mohammad
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Materials science ,business.industry ,Substrate (electronics) ,Interference (wave propagation) ,Mechanism (engineering) ,chemistry.chemical_compound ,Optics ,Planar ,chemistry ,Benzocyclobutene ,Etching ,Fiber optic splitter ,Optoelectronics ,Photonics ,business - Abstract
A 1 times 2 and 1 times 3 planar optical splitter based on BenzoCyclobutene (BCB 4024-40) polymeric material is proposed. The device is designed based on symmetric interference mechanism, utilizing a BK7 glass as a substrate and thin layer of SiO2 as a cover. Simulation results show that the splitting uniformity is better than 0.5 dB at 1550 nm optical wavelength.
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- 2006
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58. Theoretical design of a 'perfect' filter based on coupled ring resonator arrays
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L.Y. Mario, S. Darmawan, and Mee-Koy Chin
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Physics ,business.industry ,Physics::Optics ,Optical ring resonators ,law.invention ,Resonator ,Optics ,Band-pass filter ,law ,Optoelectronics ,Photonics ,business ,Optical filter ,Computer Science::Databases ,Helical resonator ,Coupling coefficient of resonators ,Photonic crystal - Abstract
We show that a general 2-D resonator lattice can approximate an ideal bandpass filter, fundamentally because the 2-D periodic structure exhibits non-overlapping photonic bandgaps.
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- 2006
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59. Quasi-stable soliton transmission in dispersion managed fiber links with lumped amplifiers
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X.Y. Tang and Mee-Koy Chin
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Physics ,Multi-mode optical fiber ,business.industry ,Single-mode optical fiber ,Polarization-maintaining optical fiber ,Molecular physics ,Graded-index fiber ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Fiber-optic communication ,Nonlinear Sciences::Exactly Solvable and Integrable Systems ,Zero-dispersion wavelength ,Optics ,Dispersion-shifted fiber ,Electrical and Electronic Engineering ,business ,Plastic optical fiber ,Nonlinear Sciences::Pattern Formation and Solitons - Abstract
We study quasi-stable solitons in a cascaded fiber line with alternating positive and negative dispersions, with and without fiber loss. Although more energy is required for forming the quasi-stable solitons than the regular solitons in a uniform fiber system with the same average dispersion, the required soliton energy decreases as the energy loss in one amplification period increases, eventually approaching the same value as in a uniform fiber system. Thus, the predicted advantage of higher soliton energy in dispersion-managed system is diminished in the presence of loss.
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- 1997
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60. Passively Q-switched diode-pumped singie-frequency Nd:YVO/sub 4/ microchip laser with a GaAs output coupler
- Author
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Gong Zhang, G.Q. Gu, F. Zhou, and Mee-Koy Chin
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Blue laser ,Materials science ,business.industry ,Ti:sapphire laser ,Physics::Optics ,Laser pumping ,Output coupler ,Injection seeder ,Laser ,law.invention ,Optics ,law ,Diode-pumped solid-state laser ,Optoelectronics ,Physics::Atomic Physics ,business ,Tunable laser - Abstract
Diode-pumped, Q-switched single-frequency microchip lasers are compact and simple solid-state lasers that can provide high peak powers with a diffraction-limited output beam.
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- 2005
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61. Transition and comparison between directional couplers and multimode interferometer based on ridge waveguides
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Chee-Wei Lee, Mee-Koy Chin, Shuh Ying Lee, and S. Darmawan
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Physics ,Interferometry ,Fabrication ,Multi-mode optical fiber ,Optics ,business.industry ,Mode coupling ,Direct current ,Astronomical interferometer ,Power dividers and directional couplers ,Polarization (waves) ,business - Abstract
In this paper, we present a comparison analysis between directional couplers (DC) and multi-mode interferometers (MMI) based on high-index contrast ridge waveguides. It is found that the two devices are intimately related as the MMI is structurally derived from the DC. For the first time, the continuous evolution from the two-mode coupling characteristic of DC to the two-mode interference and multi-mode interference of MMI is demonstrated. The resulting MMIs are compared with the DC in terms of coupling length, polarization dependence, excess loss, and fabrication tolerances. We show that practical directional couplers with reasonable gap size can also be quite compact and have the same coupling length for both TE and TM polarizations. Consequently, the DC can be just as polarization insensitive as the MMI. These features, however, require careful design control involving a large set of design parameters. By comparison, the MMI design is more robust and involves fewer design variables.
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- 2005
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62. Vertical coupler architecture for polarization-independent coupling and polarization-selective coupling
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Chee-Wei Lee and Mee-Koy Chin
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Optical fiber ,Materials science ,business.industry ,Physics::Optics ,Polarization (waves) ,Rat-race coupler ,law.invention ,Optics ,law ,Splitter ,Power dividers and directional couplers ,Hybrid coupler ,Photonics ,business ,Waveguide - Abstract
Vertical coupling between waveguides is a critical component for three-dimensional (3-D) integrated optics. Vertical integration adds flexibility in integrating different devices that require different materials, and facilitates coupling of the miniature devices with optical fibers. We propose a systematic design of a relatively simple and versatile vertical coupler that provides not only vertical interconnection, but also mode-size transformation and polarization mode selection all in one. As a vertical polarization splitter, it separates the TE and TM polarizations onto different vertical levels of a 3-D photonics structure, and is thus uniquely different from conventional splitters based on directional couplers or other planar devices. The vertical coupler consists of a larger bottom waveguide that serves to improve the fiber coupling, and a smaller top waveguide that contains the actual photonic device. As a polarization-independent coupler the vertical coupler is shown to transfer light with more than 90% efficiency for all polarizations over a transfer length of only 150 µm. As a polarization mode splitter, the vertical coupler preferentially couples TE or TM polarization with a contrast ratio up to 20dB. This versatility renders the vertical coupler a compact and useful input-stage device that improves the fiber coupling to small active devices and also provides a mechanism of polarization control. Keywords: Integrated optics, mode-size converter, vertical waveguide coupler, resonant coupling, polarization splitter
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- 2005
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63. Higher order lateral-modes discrimination in ridge waveguides for photonic integrated circuits
- Author
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Chee-Wei Lee and Mee-Koy Chin
- Subjects
Engineering ,Total internal reflection ,Optics ,business.industry ,Beam propagation method ,Photonic integrated circuit ,Single-mode optical fiber ,Physics::Optics ,Power dividers and directional couplers ,Radiation mode ,business ,Leaky mode ,Waveguide (optics) - Abstract
In photonic integration, high index contrast waveguides (e.g. ridge waveguides) have been widely used for interconnection and device construction because of their compactness. However, the strong confinement also means that the ridge waveguide is generally more multi-moded laterally than other waveguides of similar dimensions. A laterally single mode ridge waveguide is typically about 0.5 micrometer or less in width, which could incur high propagation and fiber coupling losses. Hence, a wider waveguide is often used to minimize loss at the expense of the single-mode characteristic, especially for long devices. However, many devices, such as Mach-Zehnder interferometers and directional couplers, require single-mode waveguides for proper operation. In these cases, the multimode waveguides can still be used if appropriate mode-filters are strategically located at the input and within the device to remove potential higher-order modes. We propose a higher-order mode filter using two back-to-back lateral waveguide tapers, which could be as short as 150 micrometers. Mode discrimination occurs in the down-taper where the higher-order modes become leaky when the taper width reaches their cut-off points (i.e., points where the modes are no longer guided by total internal reflection). The taper imposes only about 0.2dB loss to the fundamental mode itself. The up-taper at the other end restores the fundamental mode back to the original size. Simulations using Beam Propagation Method (BPM) shows that this mode filter is insensitive to the taper lengths and has reasonable fabrication tolerances.
- Published
- 2005
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64. Scattering Matrix Analysis for Cascaded Ring Enhanced Mach-Zehnder Interferometers
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S. Darmawan, Landobasa Y. M. Tobing, Shuh Ying Lee, Chee-Wei Lee, and Mee Koy Chin
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Physics ,Scattering ,business.industry ,Physics::Optics ,Nonlinear optics ,Resonance ,Mach–Zehnder interferometer ,Ring (chemistry) ,Interference (wave propagation) ,Physics::Geophysics ,Interferometry ,Optics ,Astronomical interferometer ,business - Abstract
We present a novel cascaded Ring Enhanced-Mach Zehnder Interferometer (RE-MZI), evolved from the recently developed single RE-MZI. Ultra-sharp resonance is demonstrated with restored output imbalance, allowing improved performance in sensing and all-optical switching applications.
- Published
- 2005
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65. Novel approach to polarization-independent single-mode microring resonator
- Author
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Mee-Koy Chin
- Subjects
Materials science ,Birefringence ,business.industry ,Single-mode optical fiber ,Polarization (waves) ,law.invention ,Resonator ,Optics ,Polarization controller ,law ,Optoelectronics ,business ,Optical filter ,Waveguide ,Free spectral range - Abstract
Micro-ring resonators, by virtue of the geometrical birefringence of the strongly-confined waveguides used to construct them, are polarization dependent, and thus of limited application in fiber networks unless integrated with a laser or polarization controller. This paper addresses the polarization sensitivity issue by proposing a novel design of an MMI-coupled resonator with substantially reduced polarization sensitivity, while maintaining single-mode and low-loss conditions. The polarization-independent, single-mode waveguide is obtained by using the proper combination of ridge width and etching depth. The design is applicable to relatively large resonators, and may provide an intrinsic solution to small- FSR (free spectral range) polarization-independent applications.
- Published
- 2004
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66. Design of polarization filter using vertical coupler
- Author
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Mee-Koy Chin and Chee-Wei Lee
- Subjects
Optics ,Materials science ,business.industry ,law ,Physics::Accelerator Physics ,Physics::Optics ,Optoelectronics ,Integrated optics ,Polarizing filter ,business ,Transformer ,law.invention - Abstract
We present a systematic design for a compact polarization filter with mode-size transformer, by using tapered resonant vertical coupler with a transfer region that includes only the resonant width for the desired polarization.
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- 2004
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67. An analysis of the performance of Franz-Keldysh electroabsorption waveguide modulators
- Author
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Mee Koy Chin
- Subjects
Physics ,business.industry ,Quantum-confined Stark effect ,Atomic and Molecular Physics, and Optics ,Franz–Keldysh effect ,Electronic, Optical and Magnetic Materials ,law.invention ,Optics ,Optical modulator ,law ,Insertion loss ,Optoelectronics ,Figure of merit ,Electrical and Electronic Engineering ,business ,Waveguide ,Order of magnitude ,Voltage - Abstract
We present an analysis of the performance limits of the Franz-Keldysh effect (FKE) waveguide modulators, based on the optimization of the material figures of merit related to device performance. This leads to a unique design approach in which the detuning energy and the thickness of the active material determine the required drive voltage and the available bandwidth. A large-core waveguide is used to minimize insertion loss. The overall performance is compared with a similar waveguide modulator based on the quantum confined Stark effect (QCSE). The conclusion is that, because of the relatively small /spl Delta//spl alpha/ available from Franz-Keldysh effect, the power-bandwidth ratio of the optimized FKE modulator is about an order of magnitude poorer than the optimized QCSE modulator. >
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- 1995
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68. Double‐disk structure for output coupling in microdisk lasers
- Author
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Seng-Tiong Ho, Wengang Bi, H. Q. Hou, Mee Koy Chin, C. W. Tu, and D. Y. Chu
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Coupling ,Physics ,Photon ,Physics and Astronomy (miscellaneous) ,business.industry ,Q value ,Physics::Optics ,Laser ,law.invention ,Semiconductor laser theory ,Resonator ,Optics ,law ,Optoelectronics ,Spontaneous emission ,Astrophysics::Earth and Planetary Astrophysics ,business ,Lasing threshold ,Astrophysics::Galaxy Astrophysics - Abstract
We report our experiment on the use of a double‐disk structure to couple light output from a microdisk laser which allows us to maintain a high Q value of the microdisk resonator. The small photon leakage rate from the lower lasing disk to the top waveguiding disk can be carefully controlled by choosing the distance between the two disks. Various structures can be fabricated on the top disk to couple the light out. In this letter, a simple opening in the top disk is used for output coupling.
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- 1994
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69. Nanophotonics: recent advances
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Mee Koy Chin and Seng Tiong Ho
- Subjects
Resonator ,Materials science ,business.industry ,Wavelength-division multiplexing ,Nanophotonics ,Optoelectronics ,Power dividers and directional couplers ,Hybrid coupler ,Crossbar switch ,Photonics ,business ,Communication channel - Abstract
We have designed, fabricated and demonstrated ultra-compact directional couplers and 'race track' micro-resonators as nano-photonic building blocks for a range of WDM devices, including ultra-compact directional couplers, channel- dropping filters, 1 X N demultiplexers and 2 X 2 crossbar switches.
- Published
- 1999
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70. Energy enhancement scaling for quasi-stable soliton transmission in lossy dispersion-managed fiber links
- Author
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Y. H. Chye, Feng Zhou, and Mee Koy Chin
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Physics ,Optical fiber ,business.industry ,Attenuation ,Amplifier ,law.invention ,Computational physics ,Optics ,law ,Dispersion (optics) ,Soliton ,Fiber ,business ,Scaling ,Energy (signal processing) - Abstract
Energy enhancement scaling for the quasi-stable soliton transmission in periodic dispersion-managed (DM) fiber links with arbitrary attenuation is proposed and discussed. Simulations show that the inclusion of the fiber loss has the effect of reducing the energy enhancement due to the dispersion variation.
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- 1998
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71. Nanophotonics: devices and applications
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Mee Koy Chin and Seng-Tiong Ho
- Subjects
Very-large-scale integration ,Materials science ,business.industry ,Optical engineering ,Nanophotonics ,Physics::Optics ,Laser ,law.invention ,Resonator ,law ,Optoelectronics ,Spontaneous emission ,Photonics ,business ,Quantum well - Abstract
An introduction to the merging field of nano-photonics is given, with emphasis on device realizations and applications. Due to the small size and high efficiency of these devices, nano-photonics has the potential for high- density integration, leading to VLSI photonics. We discuss our work in recent year on the microdisk laser, micro-ring photonic wire lasers, and microring resonators. These are among some of the smallest lasers and modulators ever fabricated. The physics of the modification of spontaneous emission rates with low-dimensional photonic structures is discussed briefly. The nanofabrications of these devices are described. A model of the microcavity resonator is then presented, which provides useful design rules as well as insights into alternative coupling structures that significantly increase the coupling length.© (1998) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
- Published
- 1998
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72. Modeling and design of waveguide-coupled single-mode microring resonators
- Author
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Seng-Tiong Ho and Mee Koy Chin
- Subjects
Diffraction ,Resonator ,Waveguide (electromagnetism) ,Optics ,Materials science ,business.industry ,Single-mode optical fiber ,Physics::Optics ,Refractive index profile ,business ,Refractive index ,Free spectral range ,Radius of curvature (optics) - Abstract
We discuss a first-order design tool for waveguide-coupled microring resonators based on an approximate solution of the wave propagation in a microring waveguide with micron-size radius of curvature and a large lateral index contrast. The model makes use of the conformal transformation method and a linear approximation of the refractive index profile, and takes into account the effect of waveguide thickness, dispersion, and diffraction. Based on this model, we develop general design rules for the major physical characteristics of a waveguide-coupled microring resonator, including the resonance wavelength, the free spectral range, the coupling ratio, the bending radiation loss and the substrate leakage loss. In addition, the physical model provides insights into alternative coupling designs that significantly increase the coupling length and reduce or eliminate the dependence on a narrow air gap in the waveguide-coupled microring resonator. We present two examples, one using a phase-matching parallel waveguide with a smaller width than the ring waveguide, and the other using a vertical coupling structure.
- Published
- 1998
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73. Iterative method for the analysis of rectangular waveguides with external effective index correction
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Seng-Tiong Ho, Mee Koy Chin, and Yong Ma
- Subjects
Physics ,Optics ,Index (economics) ,business.industry ,Simple (abstract algebra) ,Iterative method ,Mathematical analysis ,Cutoff ,Propagation constant ,business ,Waveguide (optics) ,Index method ,Network analysis - Abstract
We discuss a simple, self-consistent iterative method for the analysis of rectangular waveguides with strong guidance. We show that this method removes the ambiguity of the conventional effective index method and gives a convergent value of the propagation constant both near and far from cutoff. Near the cut-off region, the accuracy can be improved by including an external effective index correction which takes into account the finite mode effect outside the waveguide.
- Published
- 1998
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74. DIELECTRIC PHOTONIC WELLS AND WIRES AND SPONTANEOUS EMISSION COUPLING EFFICIENCY OF MICRODISK AND PHOTONIC-WIRE SEMICONDUCTOR LASERS
- Author
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Jian-Ping Zhang, Mee-Koy Chin, Shengli Wu, Seng-Tiong Ho, and D. Y. Chu
- Subjects
Materials science ,business.industry ,Coupling efficiency ,Optoelectronics ,Spontaneous emission ,Dielectric ,Photonics ,business ,Semiconductor laser theory - Published
- 1996
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75. Approximate solution of the whispering gallery modes and estimation of the spontaneous emission coupling factors for microdisk lasers
- Author
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Seng-Tiong Ho and Mee-Koy Chin
- Subjects
Coupling ,Materials science ,business.industry ,Laser ,Optical coupling ,law.invention ,Optical reflection ,Optics ,law ,Spontaneous emission ,Boundary value problem ,Whispering-gallery wave ,business ,Approximate solution - Abstract
The threshold current of a microcavity laser with low transparency current is dependent mainly on the spontaneous emission coupling factor, β, which is the spontaneous emission rate into the lasing mode divided by the total spontaneous emission rate. The spontaneous decay may be modeled as stimulated decay due to stochastic vacuum field fluctuations.1 The decay rate, γ, of a dipole due to a mode (either radiation mode or guided mode) depends on the spatial mode area and the modal density of states.1 To estimate the β value for a microdisk laser2 where exact solutions are difficult to obtain, a simple approximate method for solving the waveguide modes and the density of states is developed here.
- Published
- 1994
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76. Demonstration of a single-mesa vertical coupler and its integration with a multimode interferometer
- Author
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Shuh-Ying Lee, Chee-Wei Lee, and Mee-Koy Chin
- Subjects
Fabrication ,Multi-mode optical fiber ,Materials science ,business.industry ,Material system ,Condensed Matter Physics ,Mesa ,Electronic, Optical and Magnetic Materials ,Interferometry ,Optics ,Transfer efficiency ,Materials Chemistry ,Electrical and Electronic Engineering ,business ,computer ,computer.programming_language - Abstract
We demonstrate for the first time, to the best of our knowledge, a vertical coupler based only on a single-mesa structure. The vertical coupler requires simpler fabrication steps as compared to the conventional double-mesa structure. We are proposing a concept of realizing a vertical coupler based on the single-mesa structure, regardless of the material system, and the device performance shown is by no means the best the design could give. By conservative estimation from experimental data, the transfer efficiency is at least 16%. The device integration with a 1 × 2 multimode interferometer is also demonstrated, giving a splitting ratio of almost 50:50. The versatile design concept could be implemented in other material systems.
- Published
- 2011
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77. Spontaneous-emission factors of microring and microdisk lasers
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Daniel Y. Chu, Mee Koy Chin, and Seng-Tiong Ho
- Abstract
Recently, McCall et al. have demonstrated a 2-D strongly guided microdisk structure1 to achieve low-threshold lasing.
- Published
- 1993
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78. How small can a microring resonator be and yet be polarization independent?
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Soon Thor Lim, Shuh Ying Lee, Mee Koy Chin, Thomas Y. L. Ang, and Ching Eng Png
- Subjects
Materials science ,Silicon photonics ,Birefringence ,business.industry ,Materials Science (miscellaneous) ,Photonic integrated circuit ,Bend radius ,Physics::Optics ,Cladding (fiber optics) ,Industrial and Manufacturing Engineering ,law.invention ,Resonator ,Optics ,law ,Q factor ,Business and International Management ,business ,Waveguide - Abstract
There has been a recent trend to reduce the size of photonic waveguide devices to enable high-density integration in silicon photonic integrated circuits. However, this miniaturization tends to result in increased polarization dependency. Particularly challenging is designing devices based on ring waveguides with small radii, which exacerbates the polarization sensitivity. For these microring resonators, a legitimate question is then: Is it possible to simultaneously maintain the conditions of single-mode and structural polarization independence while shrinking the size of both the bend radius and the waveguide cross section, and, if so, how small can the ring resonator be? We demonstrate theoretically the feasibility of achieving this via deeply etched submicrometer silicon-on-insulator rib waveguides, and we show that, for a given cladding and core thickness, the radius of a polarization independent microring resonator can be as small as 3 microm, being limited chiefly by the residual birefringence of the resonator cavity and the bend losses.
- Published
- 2009
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79. A traveling-wave electroabsorption modulator with a large optical cavity and intrastep quantum wells
- Author
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Hongliang Zhu, Shuh-Ying Lee, Hua Yang, Jingtao Zhou, Weixi Chen, and Mee Koy Chin
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Chemistry ,business.industry ,Bandwidth (signal processing) ,Physics::Optics ,Condensed Matter Physics ,Waveguide (optics) ,Electronic, Optical and Magnetic Materials ,law.invention ,Optics ,Optical modulator ,law ,Optical cavity ,Materials Chemistry ,Coupling efficiency ,Traveling wave ,Optoelectronics ,Electrical and Electronic Engineering ,business ,Saturation (magnetic) ,Quantum well - Abstract
This paper reports a novel traveling-wave electroabsorption modulator (TWEAM) with a large optical cavity waveguide and an intrastep quantum well structure designed to achieve a high bandwidth, high saturation power and better fiber-matched optical profile, which is good for high coupling efficiency. The optical mode characteristic shows a great improvement in matching the circular mode of the fiber and the saturation power of 21 dBm, and a 3 dB bandwidth of 23 GHz was achieved for the fabricated TWEAM.
- Published
- 2008
- Full Text
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80. Finesse enhancement in silicon-on-insulator two-ring resonator system
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Desmond Lim, Landobasa Y. M. Tobing, Roel Baets, Mee-Koy Chin, and Pieter Dumon
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Materials science ,Mathematics::Commutative Algebra ,Physics and Astronomy (miscellaneous) ,Silicon ,business.industry ,Physics::Optics ,chemistry.chemical_element ,Silicon on insulator ,Ring (chemistry) ,Finesse ,Resonator ,Optics ,chemistry ,Optoelectronics ,business ,Coupling coefficient of resonators - Abstract
We demonstrate experimentally the finesse enhancement in a pair of mutually coupled ring resonators coupled to two buses fabricated in silicon-on-insulator technology, as proposed theoretically in an earlier paper. A finesse close to 100 (or Q=30000) is obtained in a two-ring system, with the outer ring double the size of the inner ring, and an external coupling coefficient of 34%. The maximum finesse enhancement relative to the single-ring structure is 14 times, in good agreement with the theoretical prediction.
- Published
- 2008
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81. Optical buffer with higher delay-bandwidth product in a two-ring system
- Author
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Mee Koy Chin and Landobasa Yosef Mario
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Physics ,Optics and Photonics ,Mathematics::Commutative Algebra ,Electromagnetically induced transparency ,business.industry ,Transducers ,Bandwidth (signal processing) ,Physics::Optics ,Equipment Design ,Models, Theoretical ,Slow light ,Atomic and Molecular Physics, and Optics ,Equipment Failure Analysis ,Systems Integration ,Resonator ,Light intensity ,Optics ,Computer-Aided Design ,Optoelectronics ,Computer Simulation ,Optical buffer ,business ,Photonic crystal - Abstract
We propose a new scheme for buffering optical signals in two-ring resonator system that has a larger delay-bandwidth product than those achievable in single-ring and two-ring configurations of the optical analog of electromagnetically-induced transparency (EIT).
- Published
- 2008
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82. Room-Temperature Inductively Coupled Plasma Etching of InP Using Cl 2 /N 2 and Cl 2 /CH 4 /H 2
- Author
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Chee-Wei, Lee, primary and Mee-Koy, Chin, additional
- Published
- 2006
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83. Built-in electric field enhancement/retardation on intermixing
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Soo Jin Chua, Mee-Koy Chin, C. D. Xu, Tao Mei, J. R. Dong, School of Electrical and Electronic Engineering, and A*STAR Institute of Materials Research and Engineering
- Subjects
Argon ,Materials science ,Physics and Astronomy (miscellaneous) ,Condensed matter physics ,Annealing (metallurgy) ,Fermi level ,Doping ,chemistry.chemical_element ,Condensed Matter::Mesoscopic Systems and Quantum Hall Effect ,Crystallographic defect ,Gallium arsenide ,Condensed Matter::Materials Science ,symbols.namesake ,chemistry.chemical_compound ,chemistry ,Electric field ,Engineering::Electrical and electronic engineering [DRNTU] ,symbols ,Quantum well - Abstract
The built-in electric field may impose a drift on charged point defects and may thus enhance or retard the intermixing during annealing. Electric field is built-in near the surface due to the pinning of surface Fermi level after argon plasma treatment on InP surfaces of InP/InGaAs quantum well samples. Subsequent annealing leads to different intermixing results due to the different field directions on InP cap layers in different doping types. Experiments also showed different influences of the built-in field on the two sublattices largely due to different charge numbers of point defects on the respective sublattices. Published version
- Published
- 2007
- Full Text
- View/download PDF
84. Multimode interference optical splitter based on photodefinable benzocyclobutene (BCB 4024-40) polymer
- Author
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Mee Koy Chin, Norazan Mohd. Kassim, Shuh Ying Lee, Abu Bakar Mohammad, and Mohd Haniff Ibrahim
- Subjects
Materials science ,Fabrication ,business.industry ,General Engineering ,Isotropic etching ,Atomic and Molecular Physics, and Optics ,law.invention ,chemistry.chemical_compound ,Planar ,Optics ,Interference (communication) ,chemistry ,law ,Benzocyclobutene ,Fiber optic splitter ,Optoelectronics ,business ,Waveguide ,Refractive index - Abstract
1×2 and 1×3 planar optical splitters based on Benzocyclobutene (BCB 4024-40) polymeric material are demonstrated for the first time. The devices are designed based on symmetric interference and fabricated on BK7 glass substrates with a thin layer of SiO2 as cover. A cost-effective chemical etching technique is used in the fabrication process to take advantage of the photosensitivity of the polymer. The waveguide loss was measured using the cutback method to be 3.5 dB/cm. The splitting uniformity is better than 0.02 and 1.5 dB at 1550-nm optical wavelength for the 1×2 and 1×3 splitters, respectively.
- Published
- 2007
- Full Text
- View/download PDF
85. Introduction to the Special Issue on Photonic Materials and Devices
- Author
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Ching-Kean Chia, Kantisara Pita, Jinghua Teng, Boon-Siew Ooi, and Mee-Koy Chin
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Inorganic Chemistry ,Engineering ,business.industry ,Materials Chemistry ,Condensed Matter Physics ,business ,Engineering physics ,Photonic metamaterial - Published
- 2006
- Full Text
- View/download PDF
86. Transmission properties and application of a two-ring one-bus building block.
- Author
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Mario, L.Y., Darmawan, S., Dumon, P., Baets, R., and Mee-Koy Chin
- Published
- 2008
- Full Text
- View/download PDF
87. Ultra-compact silicon-on-insulator optical filter based on sidewall Bragg grating.
- Author
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Xiaoguang Tu, Shaowu Chen, Jinzhong Yu, Qiming Wang, and Mee Koy Chin
- Published
- 2008
- Full Text
- View/download PDF
88. Submicron silicon photonic micro-ring resonator: Polarization independence.
- Author
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Ang, T.Y.L., Soon Thor Lim, Shuh Ying Lee, Ching Eng Png, and Mee Koy Chin
- Published
- 2008
- Full Text
- View/download PDF
89. Effect of rapid thermal annealing on the ordering of AlInP grown by metal-organic vapor-phase epitaxy
- Author
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Jinghua Zhao, Xiaohong Tang, Sentosa Deny, Mee Koy Chin, Zongyou Yin, Ting Mei, and An Yan Du
- Subjects
Photoluminescence ,Materials science ,Physics and Astronomy (miscellaneous) ,Annealing (metallurgy) ,Inorganic chemistry ,Analytical chemistry ,chemistry.chemical_element ,Epitaxy ,Nitrogen ,Metal ,chemistry ,Electron diffraction ,visual_art ,visual_art.visual_art_medium ,Metalorganic vapour phase epitaxy ,Rapid thermal annealing - Abstract
Spontaneous CuPt ordering is observed in AlxIn1−xP layers grown by metal-organic vapor-phase epitaxy in pure nitrogen ambient with tertiarybutylphosphine as phosphorus precursor. Changes of the degree of ordering of the AlxIn1−xP epilayer versus annealing temperature have been investigated by using photoluminescence and transmission electron diffraction. The degree of ordering of the AlxIn1−xP layers is reduced after annealing the sample at a temperature higher than the sample growth temperature. It becomes completely disordered when the annealing temperature reaches 900°C and above.
- Published
- 2005
- Full Text
- View/download PDF
90. High-index-contrast waveguides and devices
- Author
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Shuh-Ying Lee, Chee-Wei Lee, S. Darmawan, and Mee-Koy Chin
- Subjects
Materials science ,Multi-mode optical fiber ,Birefringence ,business.industry ,Materials Science (miscellaneous) ,Single-mode optical fiber ,Physics::Optics ,Industrial and Manufacturing Engineering ,law.invention ,Wavelength ,Optics ,law ,Optoelectronics ,Power dividers and directional couplers ,Business and International Management ,Photonics ,business ,Waveguide ,Leakage (electronics) - Abstract
We present a theoretical and experimental study of high-index-contrast waveguides and basic (passive) devices built from them. Several new results are reported, but to be more comprehensive we also review some of our previous results. We focus on a ridge waveguide, whose strong lateral confinement gives it unique properties fundamentally different from the conventional weakly guiding rib waveguides. The ridge waveguides have distinct characteristics in the single-mode and the multimode regimes. The salient features of the single-mode waveguides are their subwavelength width, strong birefringence, relatively high propagation loss, and high sensitivity to wavelength as well as waveguide width, all of which may limit device performance yet provide new opportunities for novel device applications. On the other hand, wider multimode waveguides are low loss and robust. In addition, they have a critical width where the birefringence is minimal or zero, giving rise to the possibility of realizing intrinsically polarization-independent devices. They can be made effectively single mode by employing differential leakage loss (with an appropriate etch depth) or lateral mode filtering (with a taper waveguide). Together these waveguides provide the photonic wire for interconnections and the backbone to build a broad range of compact devices. We discuss basic single-mode devices (based on directional couplers) and multimode devices (multimode interferometers) and indicate their underlying relationship.
- Published
- 2005
- Full Text
- View/download PDF
91. Theoretical approach to a polarization-insensitive single-mode microring resonator
- Author
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Wei-Ping Huang, Chenglin Xu, and Mee-Koy Chin
- Subjects
Waveguide (electromagnetism) ,Materials science ,business.industry ,Single-mode optical fiber ,Polarization (waves) ,Atomic and Molecular Physics, and Optics ,Resonator ,Optics ,Bend loss ,Optoelectronics ,Multimode interference ,business ,Refractive index ,Free spectral range - Abstract
This paper addresses the polarization sensitivity issue of micro-ring resonators by proposing a novel design of an MMI-coupled resonator with substantially reduced or zero polarization sensitivity, while maintaining singlemode and low-loss conditions. The design is based on polarization-independent, single-mode waveguide obtained by using a judicious combination of critical ridge width and etch depth. The design is limited to relatively large resonators having small FSR (free spectral range). For the first time, it gives designer a handle on the intrinsic polarization-dependent characteristics of waveguide microresonators.
- Published
- 2004
- Full Text
- View/download PDF
92. Polarization dependence in waveguide-coupled micro-resonators
- Author
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Mee-Koy Chin
- Subjects
Physics ,business.industry ,media_common.quotation_subject ,Nanophotonics ,Physics::Optics ,Polarization (waves) ,Asymmetry ,Atomic and Molecular Physics, and Optics ,law.invention ,Resonator ,Optics ,law ,Power dividers and directional couplers ,Maximum power transfer theorem ,Optoelectronics ,business ,Waveguide ,Refractive index ,media_common - Abstract
One dominant issue for micro-resonator filters has been polarization sensitivity due to the form asymmetry in nanophotonic waveguides. Differences in the filter's transmission intensity for TE and TM polarizations is attributed to the polarization dependent coupling. Complete power transfer in ultra-small directional couplers is demonstrated in agreement with simulations. Polarization dependence is simulated for waveguides of various widths, showing the presence of a critical width at which the propagation constants are equal for TE and TM modes. A design for polarization-independent and single-mode waveguides is discussed, along with implications for the applications of micro-resonators in general.
- Published
- 2003
- Full Text
- View/download PDF
93. Passive Q-switched single-frequency Nd:YVO4 laser with GaAs saturable absorber
- Author
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Gong Zhang, G.-Q. Gu, Mee-Koy Chin, and F. Zhou
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Materials science ,business.industry ,chemistry.chemical_element ,Saturable absorption ,Output coupler ,Laser ,Neodymium ,law.invention ,Transverse mode ,Optical pumping ,Optics ,chemistry ,law ,Optoelectronics ,Wafer ,Electrical and Electronic Engineering ,Reflection coefficient ,business - Abstract
The authors demonstrate a highly compact, passively Q-switched Nd:YVO4 laser using an uncoated GaAs wafer as a frequency-dependent output coupler as well as a saturable absorber. Owing to the Fabry-Perot effect, the effective reflection coefficient of the GaAs mirror is 0.7. The coupled-resonator cavity results in an intrinsic single-frequency operation. Under 1.4 W optical pumping, 9 ns pulses at a repetition rate of 125 kHz in a single-longitudinal and transverse mode were obtained.
- Published
- 1998
- Full Text
- View/download PDF
94. Low-loss measurement in partially buried optical waveguides on glass with a plastic prism
- Author
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Yan Zhou, Mee Koy Chin, Kok Siong Lai, and Clarence C. K. Wong
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Optical fiber ,Microscope ,Materials science ,business.industry ,Materials Science (miscellaneous) ,Base (geometry) ,Physics::Optics ,Industrial and Manufacturing Engineering ,law.invention ,Planar ,Optics ,law ,Coupling (piping) ,Prism ,Business and International Management ,business ,Waveguide ,Refractive index - Abstract
Surface and buried planar waveguides have been fabricated in glass microscope slides with purely thermal potassium and sodium ion-exchange techniques. We measured propagation loss as low as 0.08 dB/cm in the partially buried waveguides using an improved two-prism coupling method. The method includes a plastic prism and involves applying heat to soften the base of the outcoupling plastic prism so that the prism is temporarily in extremely close contact with the waveguide surface.
- Published
- 1997
- Full Text
- View/download PDF
95. InGaAs/InAlAs quantum-well electroabsorption waveguide modulators with large-core waveguide structure: design and characterization
- Author
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William S. C. Chang and Mee Koy Chin
- Subjects
Waveguide (electromagnetism) ,Materials science ,Optical fiber ,business.industry ,Stray light ,Materials Science (miscellaneous) ,Physics::Optics ,Industrial and Manufacturing Engineering ,Active layer ,law.invention ,Optics ,law ,Attenuation coefficient ,Optoelectronics ,Business and International Management ,business ,Material properties ,Absorption (electromagnetic radiation) ,Quantum well - Abstract
The design and the systematic characterization of the waveguide and the material properties of a modulator based on InGaAs/InAlAs quantum-well material for 1.5-µm operation are described. Following our previously developed theoretical design algorithm for optimizing the total performance of waveguide electroabsorption modulators [IEEE J. Quantum Electron, 29, 2476 (1993)], we designed an unconventional waveguide structure with a large passive core to yield better coupling efficiency for standard optical fibers and a thin active layer that yields a small optical-confinement factor. To evaluate the performance of this waveguide modulator, experimental methods for measuring the coupling efficiency, the optical-filling factor, and the absorption coefficient of the waveguide modulator and for characterizing the material properties were developed. The limitations of the material and the waveguide design, and the generalization of the limited set of experimental results based on a specific modulator to the design of more-general waveguide modulators are discussed.
- Published
- 1995
- Full Text
- View/download PDF
96. Pole–Zero Dynamics of High-Order Ring Resonator Filters.
- Author
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Darmawan, S., Landobasa, Y.M., and Mee-Koy Chin
- Abstract
We present a pole-zero analysis, based on the transfer matrix method, for ring resonator (RR)-based filters of Type I and Type II, consisting of mutually coupled and side-coupled RRs. The pole-zero plot determines the filter spectral characteristics and is determined primarily by the coupling coefficient between the resonators. The pole-zero dynamics (or root locus) shows how the poles and zeros move in the complex frequency plane as we vary the coupling coefficient. We show that the pole-zero dynamics for the two types of filter are complementary and, furthermore, that the pole-zero plots are related to the conditions of critical coupling and oscillation in the presence of loss or gain. We also show a pole-zero analysis for the apodization of these filters based on an actively tunable Mach-Zehnder-type coupler, where it is shown that apodization corresponds to designing pole-zero pairs with wide separations, whereas the required bandwidth determines the specific values of the coupling coefficient. [ABSTRACT FROM PUBLISHER]
- Published
- 2007
- Full Text
- View/download PDF
97. A novel 1 × 2 multimode interference optical wavelength filter based on photodefinable benzocyclobutene (BCB 4024–40) polymer.
- Author
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Ibrahim, M. H., Kassim, N. M., Mohammad, A. B., Shuh-Ying Lee, and Mee-Koy Chin
- Subjects
OPTICAL waveguides ,OPTOELECTRONIC devices ,ELECTRIC filters ,WAVELENGTHS ,POLYMERS ,ELECTRIC interference - Abstract
A novel 1 × 2 multimode interference (MMI) optical wavelength filter for 1310 and 1550 nm operation based on photodefinable BenzoCyclobutene (BCB 4024–40) polymer is demonstrated. The device is fabricated on BK7 glass substrate with thin layer of SiO
2 as cover. A cost effective chemical etching technique is used in the fabrication process to take advantage of the photosensitive nature of the polymer. The filter length is significantly reduced by adopting the restricted MMI scheme, lower beat length ratio, and cascaded MMI couplers. At 1550 nm filtering operation, the measured crosstalk is -20.6 dB and at 1310 nm filtering is -14.4 dB. The measured insertion loss is around 3.2–3.5 dB for both ports. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1024–1028, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22327 [ABSTRACT FROM AUTHOR]- Published
- 2007
- Full Text
- View/download PDF
98. Asymmetric Fano resonance and bistability in a two-ring resonator optical switch with high extinction ratio and low switching threshold.
- Author
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Mario, Landobasa Yosef and Mee Koy Chin
- Subjects
OPTICAL bistability ,DATA transmission systems ,DIGITAL communications ,BROADBAND communication systems ,SWITCHING systems (Telecommunication) - Abstract
We propose a two-ring resonator configuration that can provide optical switching with both high extinction ratio (ER) and low switching threshold. The achievable input threshold is n
2 IIN ~ 10−5 or smaller, which is one order lower than that of the conventional one-ring configuration, while maintaining an ER of at least 10dB over a 10-GHz (0.1 nm) optical bandwidth. This performance is enabled by using an asymmetric Fano resonance as opposed to the usual symmetric resonance. The low switching threshold and the high ER are related to the sharpness and the asymmetricity of the Fano resonance, respectively. [ABSTRACT FROM AUTHOR]- Published
- 2006
- Full Text
- View/download PDF
99. A rigorous comparative analysis of directional couplers and multimode Interferometers based on ridge waveguides.
- Author
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Darmawan, S., Shuh-Ying Lee, Chee-Wei Lee, and Mee-Koy Chin
- Abstract
We present a rigorous comparison of the unique characteristics of directional couplers and multimode interferometers based on the unique properties of high-index contrast ridge waveguides. The two devices are intimately related as the multimode interference (MMI) is derived from the directional couplers (DCs). We show for the first time the continuous evolution from the two-mode coupling characteristic of DC to the multimode mixing and interference characteristic of MMI, as the DC is structurally transformed into the MMI. We also show that DC can be designed to have the MMI features of compactness and polarization-insensitivity, two traits that reflect their shared lineage. The performance of MMI and DC are compared in terms of coupling length, polarization dependence, crosstalk, excess loss, and fabrication tolerances. We show that the DC, as long as it is designed to have nearly the same coupling length for transverse electric and transverse magnetic, can potentially have better performance than the MMI in terms of crosstalk and polarization sensitivity. Such a DC, however, requires careful control of many design parameters, while the MMI design is more robust and involves fewer design variables. Finally, the effect of higher-order modes and mode filtering are also considered. [ABSTRACT FROM PUBLISHER]
- Published
- 2005
- Full Text
- View/download PDF
100. Simple electrical biasing for minimizing the nonlinearities of quantum-well Mach-Zehnder modulators
- Author
-
Mee Koy Chin
- Subjects
Physics ,Kerr effect ,business.industry ,Materials Science (miscellaneous) ,Physics::Optics ,Linearity ,Biasing ,Mach–Zehnder interferometer ,Industrial and Manufacturing Engineering ,symbols.namesake ,Optics ,Optical modulator ,Stark effect ,Modulation ,symbols ,Business and International Management ,business ,Quantum well - Abstract
The quadratic nature of the electro-optic effect in semiconductor Mach-Zehnder modulators based on the quantum-confined Stark effect allows simple electrical biasing to eliminate either the second-order or the third-order distortions in the optical output, improving the device linearity for single-octave bandwidth multicarrier analog modulation applications.
- Published
- 1994
- Full Text
- View/download PDF
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