MONOLITHIC 8-WAVELENGTH DEMULTIPLEXED RECEIVER FOR DENSE WDM APPLICATIONS

A single chip incorporating a waveguide grating router and eight p-i-n photodetectors followed by eight preamplifiers constructed from heter ojunction bipolar transistors, has been realized. The chip ran demulti plex eight wavelengths spaced 100 GHz (0.81 nm) apart with nearest nei ghbor crosstalk better than -15 dB. The external quantum efficiency fo r each of the eight wavelength demultiplexed photodetectors was 5-8% ( a responsivity of 0.06-0.10 A/W) and each optical front end operated u p to 2.5 Gb/s. This is the first demonstration of monolithic integrati on of electronic circuits with a wavelength demultiplexer.