The powerpenalty of direct modulation is smaller than that of external modulation at the same crosstalk level.
在相同串扰水平情况下,直接调制的功率代价小于外调制的功率代价。
3
Thirdly, we quantify the powerpenalty caused by the PMD in optical subcarrier multiplexing (OSCM) system with amplitude shift keying (ASK) and binary phase shift keying (BPSK).