Simple ONU transmitter based on direct-phase modulated DFB laser with heterodyne detection for udWDM-PON

A direct phased modulated DFB laser with a simple equalizer is proposed for cost-effective ONU implementation in udWDM-PON. DBPSK data is successfully transmitted at 1.25Gb/s achieving a receiver sensitivity of -43dBm at a BER=10^-3 with heterodyne detection while a penalty of less than 1dB is observed with 75km when compared with btb.