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 3.2nm and a small footprint of ~2mm2. The photodetectors have a dark current of ~3nA at 5V bias and a responsivity of 1A/W.
The on-chip loss for the central PCG channels is 3dB,
resulting in an on-chip responsivity of 0.5A/W.
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