The largest-scale arrayed-waveguide-grating multiplexer ever has been fabricated on an InP substrate. The device has 64 input/output ports with 0.4 nm (50 GHz) channel spacing and a chip size as small as 3.6 × 7.0 mm. The crosstalk is < –20 dB for neighbouring and all other channels.
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Kohtoku et al. (1997) studied this question.
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