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Journals and Conferences
An in situ birefringence measurement in conjunction with an atomic force microscope study shows that the geometric asymmetry of the side-writing process is a major cause of the induced birefringence in grating-based fiber devices. Measured refractive-index profiles of UV-exposed fibers clearly show the asymmetry in the induced index change. We demonstrate… (More)
We report on the design and characterization of focusing-curved subwavelength grating couplers for ultra-broadband silicon photonics optical interfaces. With implementation of waveguide dispersion engineered subwavelength structures, an ultra-wide 1-dB bandwidth of over 100 nm (largest reported to date) near 1550 nm is experimentally achieved for… (More)
We present the detailed analysis and characterization of a silicon Michelson modulator with short 500 μm phase shifters and a low VπLπ of 0.72 V-cm under reverse bias. We investigate optical modulation of reverse biased p-n and forward biased p-i-n junctions. We demonstrate for the first time that error-free operation up to 40 Gbps is possible with lumped… (More)
We developed a 4×4 fully non-blocking crossbar switch fabric based on interferometric thermal phase shifters, where heating is achieved using resistive elements around the silicon waveguide. We achieved switching times of 5 μs, with 41 mW power consumption in an individual switching element.
We report on theoretical and experimental investigation of azimuthal and longitudinal modes in rolled-up microtubes at telecom wavelengths. These microtubes are fabricated by selectively releasing a coherently strained InGaAs/GaAs bilayer. We apply planar waveguide method and a quasi-potential model to analyze the azimuthal and longitudinal modes in the… (More)
We demonstrate the operation of a low V<sub>π</sub>L<sub>π</sub>, lumped, and compact Michelson modulator fabricated in SOI. The modulator operates up to 25 Gbps with measured error free operation up to 12.5 Gbps.
We report on the first experimental demonstration of the thermal control of coupling strength between a rolled-up microtube and a waveguide on a silicon electronic-photonic integrated circuit. The microtubes are fabricated by selectively releasing a coherently strained GaAs/InGaAs heterostructure bilayer. The fabricated microtubes are then integrated with… (More)
We demonstrate the first fiber grating coupler with focusing curved subwavelength structures. An ultra-wide 1-dB bandwidth of over 100 nm with -6.7 dB coupling efficiency at 1550 nm has been experimentally achieved. OCIS codes: (050.2770) Gratings; (050.6624) Subwavelength structures.
We report a silicon photonic modulator based on a Mach–Zehnder interferometer (MZI) loaded with a microring modulator (MRM) on one arm and a microring resonator (MRR) on the other arm. The device is operated with the resonances of the MRM and the MRR overlapped to improve the extinction ratios and the optical modulation amplitudes. The operating principle… (More)
We demonstrate, for the first time, the controlled coupling of rolled-up microtubes integrated with silicon waveguides by thermally tuning the coupling gap. Then we realize coupling modulation utilizing the dynamic tuning effect.