基于延时自零差光相干接收机的激光器相位噪声测试系统

在相干光通信系统中,激光器相位噪声是影响接收机灵敏度的重要因素。针对相干光通信中的激光光源相位噪声测试提出并研究了表征激光器相位噪声的3个关键指标,分别是电场的功率谱密度、相位误差方差和FM噪声谱线,建立了基于延时自零差相干接收技术的窄线宽激光器相位噪声测试系统,实现了系统仿真,并对一窄线宽激光器进行了相位噪声测试,相比传统的自外差线宽测量技术,此方法在满足测试分辨率要求的同时能够更全面表征激光器相位噪声特性。

Delayed self-homodyne phase noise measurement system with optical coherent receiver

In coherent optical communication system, the phase noise of laser sources has been identified as a crucial characteristic that affects the receiver sensitivity of optical communication terminal. To characterize the laser sources phase noise of coherent optical communication system, three critical parameters which contained the field spectrum, phase-error variance and FM-noise spectrum were proposed for noise test in this paper. A delayed self-homodyne phase noise measurement system with optical coherent receiver was established and the optical communication system simulation had been achieved at the same time. The phase noise tests based on delayed self-homodyne phase noise measurement system which were used to evaluate the quality of coherent optical communication system had been performed on a narrow line-width semiconductor laser. Compared with traditional self-heterodyne narrow line-width measurement, this method can fully characterize the laser phase noise and achieve the requirement of resolution.