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We demonstrate a compact and cost-effective 30-channel integrated spectrometer fabricated on a nanophotonic silicon-on-insulator (SOI) platform. The spectrometer consists of a planar concave grating (PCG) demultiplexer with heterogeneously integrated III-V photodetectors. The device has a resolution of 3.2 nm and a small footprint of ~2 mm2. The photodetectors have a dark current of ~3 nA at 5 V bias...
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