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An optimized grating coupler featuring both ultra-broad bandwidth and high-efficiency has been achieved for the first time for the +1 diffraction order at a central operating wavelength 1.55 µm for TM polarization in horizontal slot waveguides. With proper design of the thickness of the groove thickness in grating region, we achieved a 60 nm 1 dB bandwidth, and the 3 dB bandwidth is 92 nm covering...
Fiber to silicon nitride waveguides coupling is achieved using silicon grating coupler with a transition. Two optimized couplers are designed for TE and TM mode excitation, achieving over 55% efficiency. Fabrication issues are also discussed.
A hybrid integrated receiver on grating coupler-embedded silicon platform is presented. The platform fabricated on silicon-on-insulator consists of two grating couplers as an input and output. The active silicon layer thickness, pitch, and depth are 220, 560, and 70 nm in the grating coupler on the platform, respectively. The photodiode is integrated on the output grating coupler directly. The measured...
A polarization diversity circuit in silicon waveguide was developed. The polarization dependent loss is 0.5 dB. The insertion loss from the polarization diversity components is 3 dB. The extinction ratio of the ring circuit is 20 dB.
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