InP-based 64-channel arrayed waveguide grating with 50 GHz channel spacing and up to -20 dB crosstalk

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/spl times/7.0 mm. The crosstalk is <-20 dB for neighbouring and all other channels.