A WDM RECEIVER PHOTONIC INTEGRATED-CIRCUIT WITH NET ON-CHIP GAIN

We demonstrate a photonic circuit with an optical preamplifier, a WDM filter and a fast photodetector integrated on the same chip. The passi ve integrated filter is formed by an aspheric waveguide lens and a pla nar Bragg grating. This arrangements yields narrow filter response (8 angstrom width at -3 dB is demonstrated) and high rejection ratio of 2 4 dB. The optical preamplifier consisting of strained multi-quantum we ll layers provides sufficient amplification to overcome the passive lo sses. Response curves demonstrate net on-chip gain with low ripple.