Compact and low loss 90° optical hybrid on a silicon-on-insulator platform

OPTICS EXPRESS(2017)

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Abstract
We present a compact and low loss 90 degrees optical hybrid on a silicon-on-insulator (SOI) platform for coherent receiving systems. Our 90 degrees optical hybrid uses a novel topology, comprising one Y-junction and three 2x2 multimode interference (MMI) couplers. The geometry of the 90 degrees optical hybrid is fully optimized using particle swarm optimization (PSO). The fabricated 90 degrees optical hybrid has a compact footprint of 21.6 mu m x 27.9 mu m, with an insertion loss less than 0.5 dB, a common mode rejection ratio (CMRR) larger than 30 dB, and phase error smaller than 3 degrees in the C-band across 22 reticles on one wafer. The measured phase error (< 3 degrees) in a packaged coherent receiver further confirms the excellent performance of the 90 degrees optical hybrid. (C) 2017 Optical Society of America
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Key words
optical hybrid,silicon-on-insulator
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