Amplitude regeneration of NRZDPSK signal with a feed-forward control circuit
An optical-and-electrical hybrid-type amplitude regenerator for an NRZDPSK signal suffering from optical amplifier noise is described. The system is a feed-forward control circuit composed of a coupler, a photo detector, and an intensity modulator, and works to suppress intensity fluctuations in a DPSK signal while preserving phase information. A schematic explanation of how the DPSK transmission performance is improved with intensity noise suppression during transmission is presented, and an experiment to demonstrate its effect is conducted.
regenerator dpsk optical communication