Directly modulating a long weak-resonant-cavity laser diode at limited bandwidth of 5 GHz with pre-leveled 16-QAM OFDM transmission at 20 Gbit/s

Coherently injection-locked and directly modulated long weak-resonant-cavity FPLD for pre-leveled optical 16-QAM OFDM transmission in DWDM-PON at 20.25-Gbit/s over 25-km is demonstrated with receiving sensitivity of -8dBm at EVM of 8% and BER of 3.8×10 -3 .