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Your search keyword '"Maese-Novo, Alejandro"' showing total 13 results
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13 results on '"Maese-Novo, Alejandro"'

1. Silicon nitride photonic integrated circuits for optical coherence tomography

Author

He, Sailing, Vivien, Laurent, Hainberger, Rainer, Müllner, Paul, Eggeling, Moritz, Maese-Novo, Alejandro, Morozov, Yevhenii, Nevlacsil, Stefan, Cipriano, Pietro, Rist, Desiree, Sagmeister, Martin, Kraft, Jochen, Richter, Stefan, Kempe, Michael, Gloor, Stefan, Duelk, Marcus, Verwaal, Nanko, Yurtsever, Gunay, Berciano, Mathias, Ferraro, Filippo, Van Dorpe, Pol, Agneter, Anja, Nguyen, Quang, Rank, Elisabet, Drexler, Wolfgang, Trappen, Mareike, Blaicher, Matthias, Thiel, Michael, Butler, Sharon, Gradkowski, Kamil, Morrissey, Padraic, O'Brien, Peter, Vlaskovic, Marko, Zimmermann, Horst, and Seyringer, Dana

Published
2024
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2. Spectral domain and swept source optical coherence tomography on a photonic integrated circuit at 840nm for ophthalmic application

Author

Wojtkowski, Maciej, Boppart, Stephen A., Oh, Wang-Yuhl, Rank, Elisabet A., Nevlacsil, Stefan, Müllner, Paul, Hainberger, Rainer, Maese-Novo, Alejandro, Dülk, Marcus, Gloor, Stefan, Völker, Matthias, Verwaal, Nanko, Meinhardt, Gerald, Sagmeister, Martin, Kraft, Jochen, Morrissey, Padraic, Jezzini, Moises, Quan, Zhiheng, O'Brien, Peter, Richter, Stefan, Kempe, Michael, Seyringer, Dana, and Drexler, Wolfgang

Published
2019
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7. Switchable dual-polarization external cavity tunable laser

Author

Mueller, Tim, Maese-Novo, Alejandro, Zhang, Ziyang, Polatynski, Andrzej, Felipe, David, Kleinert, Moritz, Brinker, Walter, Zawadzki, Crispin, and Keil, Norbert

Abstract

An external cavity laser is demonstrated based on the hybrid integration of an InP-based gain element, a half-wave plate, and thermally drivable polymer waveguide circuits. The laser has one oscillation region but two outputs for TE and TM emissions. The central wavelength can be tuned 20 nm at 20 mW heater electrical power. The TM path undergoes a 1.4 dB power penalty due to the presence of the half-wave plate. However, the on-chip thermo-optic switch (TOS) can compensate for this imbalance and steer the laser into an equal TE and TM output power. The TOS can also be adjusted to prefer one polarization path over the other with ∼10  dB extinction ratio.

Published
2015

8. Thermally optimized variable optical attenuators on a polymer platform

Author

Maese-Novo, Alejandro, Zhang, Ziyang, Irmscher, Gelani, Polatynski, Andrzej, Mueller, Tim, de Felipe, David, Kleinert, Moritz, Brinker, Walter, Zawadzki, Crispin, and Keil, Norbert

Abstract

Variable optical attenuators based on a 1×1 multimode interference device (MMI) and a Mach–Zehnder interferometer (MZI) have been designed, fabricated, and characterized. Thermo-optic simulations have been performed to find the optimal heater electrode layout in order to improve the heating efficiency, suppress thermal crosstalk, and enhance the dynamic attenuation range. Both types of attenuators feature low optical loss (<0.7  dB). The compact 1×1 MMI provides a dynamic attenuation range of 35 dB over the C band at 10.1 mW heater power, while the MZI increases the dynamic range beyond 50 dB at merely 1.8 mW heater power.

Published
2015

11. New concepts in silicon component design using subwavelength structures

Author

Molina-Fernandez, Iñigo, Halir, Robert, Ortega-Moñux, Alejandro, Zavargo-Peche, Luis, Romero García, Sebastian, Maese-Novo, Alejandro, Perez-Galacho, Diego, Wanguemert-Perez, Gonzalo, Cheben, Pavel, and Xu, Dan-Xia

Abstract

Subwavelength gratings (SWG) are periodically segmented waveguides with a pitch small enough to suppress diffraction. These waveguides can be engineered to implement almost any refractive between the refractive indices of the material that compose the waveguide, thereby opening novel design possibilities. In this communication we explore the use of SWGs in the design and optimization of a variety of integrated optical devices in the silicon-on-insulator platform: fiber-to-chip grating couplers, polarization splitters and high performance multimode interference couplers. We furthermore show that the dispersion properties of SWGs enable the design of novel filters, and discuss the design of low transitions between SWG waveguides of different characteristics.

Published
2012
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13. 301-nm wavelength tunable differentially driven all-polymer optical filter

Author

Zhang, Ziyang, Maese-Novo, Alejandro, Schwartz, Erik, Zawadzki, Crispin, and Keil, Norbert

Abstract

An optical filter based on all-polymer grating-assisted directional coupler is demonstrated. The wavelength tuning is differentially driven. The heater-electrodes created on the sidewalls of the polymer ridge can either blue- or red-shift the central wavelength. A total tuning range of 301 nm is achieved experimentally. The maximal local temperature gradient introduced across the coupler region is only 55°C–68°C. The filter is also insensitive to uniform ambient temperature change. Central wavelength jitter of ±3  nm is observed when the chip holder temperature cycles between 20°C and 80°C.

Published
2014

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