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面对100 Gb/s光纤传输系统性能监测需求,自主研制完成高速线性光采样模拟前端。其内部由1个被动锁模光纤激光器产生脉宽为2 ps、重复频率为96.25 MHz的采样光脉冲,待测偏振复用四相移键控(PDM-QPSK)信号和采样光脉冲进入光混频器后完成偏振相位分集探测,利用模拟带宽为400 MHz的平衡探测器完成光电转换后,将4路模拟信号传入主机进行数字化处理,获得高速光信号时域分析结果。通过优化设计,实现被动锁模光纤激光器的脉冲功率、中心波长、重复频率稳定输出。利用商用128 Gb/s PDM-QPSK信号对工程样机和安捷伦调制信号分析仪N4391A展开对比测试,测试结果表明工程样机可获得相同的时域参数分析结果。
The face of 100 Gb / s optical transmission system performance monitoring needs, independently developed high-speed linear optical sampling analog front-end. Internally, a passive mode-locked fiber laser generates a sampling pulse with a pulse width of 2 ps and a repetition frequency of 96.25 MHz. The polarization-multiplexed four-phase shift keying (PDM-QPSK) signal and the sampling light pulse enter the light mixing Polarization phase diversity detection is completed after the frequency converter is completed. After the photoelectric conversion is completed by a balanced detector with an analog bandwidth of 400 MHz, the four analog signals are transmitted to a host computer for digitalization to obtain the time-domain analysis result of the high-speed optical signal. By optimizing the design, the pulse power, center wavelength and repetition frequency of passive mode-locked fiber laser can be output stably. The commercial 128 Gb / s PDM-QPSK signal is used to test the engineering prototype and the Agilent Modulation Signal Analyzer N4391A. The test results show that the engineering prototype can obtain the same time-domain parameter analysis results.