报道了一个多路140Mb/s频移键控(FSK)直接检测非相干频分复用(FDM)光纤传输系统。该系统采用国产1.5μm分布反馈(DFB)激光器作为光源,(2~(23)—1)字长的NRZ伪随机码直接对激光器作FSK调制,系统频道间距为4.0GHz,拥有同时布置8个频道的能力。各频道由一新型可调谐FP谐振腔实现解复用和FSK至ASK解调。在拥有两个频道的示范实验中,每一频道误码率均优于1×10~(-9),测得的最佳误码率优于10~(-11),在FP腔解复用器之前的系统接收功率灵敏度为—28dBm,并可在室温条件下长时间稳定工作。 Reported a multi-channel 140Mb / s frequency shift keying (FSK) direct detection of incoherent frequency division multiplexing (FDM) optical transmission system. The system uses domestic 1.5μm distributed feedback (DFB) laser as the light source, (2 ~ (23) -1) word length NRZ pseudo-random code FSK modulation directly to the laser, the system channel spacing of 4.0GHz, with the simultaneous layout of 8 Channel capacity. Each channel is demultiplexed and FSK-to-ASK demodulated by a new tunable FP resonator. In a demonstration experiment with two channels, the error rate of each channel is better than 1 × 10 -9 and the best bit error rate is better than 10 ~ (-11) The system before receiving power consumption sensitivity of -28dBm, and can be stable at room temperature for a long time.