A monolithically integrated tunable DFB optical filter, amplifier and
detector has been fabricated. Packaged devices provide 19.6 dB optical
gain at 4 GHz filter bandwidth (3 dB) and 4 nm tuning around 1552 nm.
A sensitivity of -29.5 dBm (at 10(-9) BER) has been achieved for a 1.
2 Gbit/s signal.