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The coherent temporal soliton in optical microresonators has attracted great attention recently. Here, we have fabricated the microrod resonator with Q factor as high as $2\times 10^{8}$ and demonstrated the dissipative Kerr soliton generation in such a microresonator, by utilizing an auxiliary-laser-assisted thermal response control. In addition, we have changed the pump laser and observed the perfect soliton crystals. With the simulation, we found that the perfect soliton crystals are generated based on the avoided mode crossing, which is affected by the pump resonance and pump power. [ABSTRACT FROM AUTHOR]

Broadly tunable whispering gallery mode (WGM) microbottle resonators (MBRs) are demonstrated with Q-factor in excess of $10^{5}$. Dense and complex transmission spectra of the solid MBRs were simplified substantially by using a “shallow” MBR profile and microtaper excitation fibers with 10- ${\mu }\text{m}$ waist diameter. Mechanical tuning by strain over full azimuthal free spectral range (FSR) is demonstrated. [ABSTRACT FROM AUTHOR]

Whispering gallery modes (WGMs) have been effectively excited in a silica tube by employing a single-mode-fiber/multimode-fiber (SMF/MMF) joint with the lateral offset to enhance the evanescent field over the tapered MMF region. Experimental results indicate that thanks to the lateral offset at the SMF-MMF joint, the taper diameter is about one order of magnitude larger than that of a standard fiber taper coupler. The WGMs in the silica capillary have been theoretically analyzed by using the eigen equation to deal with WGMs in cylindrical microresonators. Our proposed WGM excitation scheme is more robust than the conventional WGM systems based on fiber tapers of a few micrometers in diameter, which is anticipated to serve as micro-fluidic-channel for biological and chemical sensing applications. [ABSTRACT FROM PUBLISHER]

A micro-fluidic-channel is proposed based on a fiber-tip-excited hollow-core photonic crystal fiber microresonator. The reflection conical fiber tip is fabricated based on electric arc fusion technique. A quality factor up to 8.65 \times 10^\mathrm 4 has been experimentally acquired at $\sim 1557.75$ nm. Theoretical simulation results indicate that the refractive index sensitivity of the whispering-gallery-mode resonance wavelength reaches 1259.9211 nm/RIU for biocompatible low refractive index range. The proposed microfluidic detection platform has a few desirable merits, such as ease of fabrication, low-cost, and structure robustness, which ensures its applicability for practical use in chemical as well as biological sensing applications. [ABSTRACT FROM PUBLISHER]

We experimentally investigate selective excitation and probing of localized axial modes in a microcylindrical resonator using two tapered fibers. The channel dropping properties of such a resonator are characterized and discussed, which are shown to depend on the excitation and probing structures. More importantly, the tunability in both drop efficiency and bandwidth can be achieved by vertically moving the add–drop fiber while keeping it in contact with the surface of the microcylinder. In contrast to tuning methods reported to date, such a physical contact combined with the significantly large axial distance between the two nearby nodes of mode function exhibited by our resonator allows for a fine, controlled, and stable tuning, making a robust and dynamic all-fiber device that may intrigue unique potential in sensors, microlasers, and add–drop filters applications. [ABSTRACT FROM PUBLISHER]

We report on the results of numerical investigations into the effects of slot geometry of horizontal slot microdisk resonators on their performance as optical biosensors. We find that for resonator-based biosensors, the mode overlap is the limiting factor for the performance. With this finding, we suggest that slot resonators are superior to conventional, evanescent-field based resonators primarily for the surface sensing, where a high optical field created by the thin slots can be used. Possible mixing of modes reduces the mode overlap and thus need to be avoided by proper design of the resonator structure. We further propose an optimized triple-slot structure to double the possible detector sensitivity. [ABSTRACT FROM PUBLISHER]

We encapsulate a high-quality (Q) factor optical whispering gallery mode (WGM) microtoroid resonator together with its side coupled fiber taper inside a low refractive index polymer, achieving a final Q higher than 10^7. Packaging provides stable resonator-fiber taper coupling, long-term maintenance of high-Q, a protective layer against contaminants, and portability to microtoroid resonator based devices. We test the robustness of the packaged device under various conditions and demonstrate its capability for thermal sensing. [ABSTRACT FROM PUBLISHER]

We propose a microresonator scheme for a Mach-Zehnder interferometer in which a microresonator is side coupled to one arm and the other is inserted in the other arm, to produce coupled resonator-induced transparency (CRIT) and absorption (CRIA) effects. In this system, CRIT and CRIA effects with one effect next to another over a frequency range when two microresonators are identical and Fano-resonance line shape when the sizes of two microresonators are unequal are achieved. We also theoretically investigate the improving optical bistability characteristic based on CRIT. [ABSTRACT FROM PUBLISHER]

A novel bandwidth-tunable optical filter based on a microelectromechanical-system-actuated microdisk resonator is utilized for dynamic bandwidth allocation. The filter bandwidth can be dynamically adjusted by voltage tuning the gap spacing between the two waveguides and microdisk. Three key applications of dynamic bandwidth allocation are demonstrated experimentally. Matched optical filtering is achieved on 5-Gb/s nonreturn-to-zero (NRZ) signals with error-free ( 10-9 bit-error-rate) data transmission. Reconfigurable channel banding of three 2.5-Gb/s NRZ signals is demonstrated by either routing a single or a group of data channels. Wavelength demultiplexing of three channels under the worst-case scenario shows 14.5-dB suppression with error-free operation. [ABSTRACT FROM PUBLISHER]

We demonstrate for the first time a nonlinear finite-difference time-domain (FDTD) analysis of optical parametric four-wave mixing (FWM) in an actual InGaAsP-InP-based racetrack microresonator, and the results are compared with measurements on an experimental prototype. It has been found from the two-dimensional (2-D) and three-dimensional FDTD analyses that the resonance frequencies can be reasonably predicted by an FDTD model by considering the strong material dispersion of the waveguide medium and that the wavelength conversion by FWM is not sensitive to the dimensionality of the model; thus, it is efficiently predicted by the 2-D FDTD model. [ABSTRACT FROM PUBLISHER]

Vertically coupled electrically pumped InGaAsP microring optical amplifiers providing gain at 1550 nm are demonstrated. The microrings provide up to 10 dB of gain at the through-port in pulsed mode. The bias current is used to control the loss in the ring and, hence, the region of operation (under-coupled, critically coupled, transparency, and gain). Sulfur passivation is used to reduce carrier loss due to surface recombination in the active region. The amplifiers are designed for application in cascaded microring optical logic gates in photonic logic circuits. [ABSTRACT FROM PUBLISHER]

We demonstrate a very high quality (Q) factor wavelength filter based on a buried heterostructure (BH) microresonator platform technology. A 200-μm-radius BH ring resonator is integrated with a semiconductor optical amplifier (SOA) using offset quantum wells for loss-cancellation. The resonator is operated near critical coupling at ISOA=29 mA, which yields a coupling-limited Q of 2.0×105 with an extinction of -26 dB at the resonant wavelength. [ABSTRACT FROM PUBLISHER]

A Mach-Zehnder interferometer with an electrooptic polymer mircroring resonator adjacent to one of its branches is realized in a polymer layer stack. The microresonator is defined by reactive ion etching in the nonlinear PMMA-DR1 polymer and waveguide definition is done without etching, by using a negative photoresist (SU8) as waveguide layer. Electrooptic coefficients of 10 pm/V and modulation frequencies of 1 GHz were measured. [ABSTRACT FROM PUBLISHER]

We demonstrate a 20-μm-long tunable optical resonator integrated on a silicon-on-insulator waveguide. The microresonator consists of a planar Fabry-Perot microcavity defined by deep Si/SiO2 Bragg reflectors with a high finesse of 11.2. The device is electrically driven and shows a modulation depth as high as 53% for a power consumption of only 20 mW. [ABSTRACT FROM PUBLISHER]

A detailed analysis of spatio-spectral photon scanning tunneling microscope scans of the light intensity inside a cylindrical microresonator has been carried out. By comparing the experimental results with theory, it is shown that the inclusion of spectral mode-beat phenomena is crucial for an accurate analysis of the modes present in the microresonator. [ABSTRACT FROM PUBLISHER]