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利用光纤无源器件制作了光学90°混频器,实现了混频器90°相移的精确控制与监测,稳定时间达到12 h以上,利用此混频器研究并实现了数字相干光检测。对差分相移键控(DPSK)信号光和本振光进行混频,高速模数转换器(ADC)对混频后的基带信号采样,利用离线数字信号处理算法进行光载波相位估计和色散补偿,利用有限冲击响应(FIR)数字滤波器补偿了经过90 km光纤传输的8 Gb/s速率DPSK信号的色散失真,测量无误码。
An optical 90 ° mixer was fabricated by using optical fiber passive components. The 90 ° phase shift of the mixer was accurately controlled and monitored. The settling time was over 12 h. The digital coherent light detection was realized and realized by using this mixer. The differential phase shift keying (DPSK) signal light and local oscillator light mixing, high-speed analog-digital converter (ADC) sampling of the baseband signal after mixing, the use of off-line digital signal processing algorithm for optical carrier phase estimation and dispersion compensation , The dispersion distortion of an 8 Gb / s rate DPSK signal over a 90 km optical fiber is compensated using a finite impulse response (FIR) digital filter without error.