Abstract
A technique for DPSK receiver-sensitivity improvement is demonstrated using numerical simulations. It is based
on reshaping and reamplifying of received 80 Gbit/s DPSK using an SOA before a one bit delay interferometer.
The SOA re-amplifies data without adding amplitude or differential phase noise due to its gain-compression. The
system is tested using 2
-1 PRBS RZ-DPSK (NRZ-DPSK) loaded with both phase and amplitude noise. It
shows 2dB (1.7dB) quality-factor improvement. The estimated BER by error-counting shows receiver-sensitivity
improvement of (See manuscript)3dB in case of single-ended detection and (See manuscript)2dB ((See manuscript)2.5dB) in case of balanced-detection. This
single-ended improvement is comparable to that of common DPSK balanced-detection technique.