High-performance InPreflection-grating wavelength multiplexer

Abstract
A high-performance InP refleclion-grating wavelength multiplexer for the 1530–1560 EDFA fibre band is reported. The 8 channel 3.6 nm-spacing devices operated with 30–35 dB channel isolation, < 0.04 wavelength precision, and < 10 dB on-chip loss. Although realised with 3.6nm spacings, the multiplexer may be adapted for channels as close as 0.5 nm.