80Gbits/s DPSK receiver-sensitivity improvement using balanced gain-compression and amplification inside an SOA balanced-receiver

A novel technique for 2R-regeneration (re-shaping and re-amplification) of received RZ or NRZ 80 Gbit/s DPSK data is demonstrated using numerical simulations. The technique is based on using a single SOA balanced-receiver for balanced gain-compression and balanced amplification of demodulated DPSK (OOK) data. The utilized SOA is polarization-insensitive with 100 ps recovery time, and the tested data is 223-1 PRBS long. The balanced configuration of co-propagating orthogonally-polarized and complementary OOK streams inside SOA introduce a negligible pattern-dependence at system output. The receiver has been tested by wide-range of input random phase and amplitude-noise showing a remarkable improvement in data quality-factor. The BER demonstrates a receiver-sensitivity improvement by more than 4 dB in both cases of single-ended and balanced-detected signals.