【摘要】 基于四相相移键控(QPSK)调制的光锁相环工作原理,通过建立环路数学模型系统分析了QPSK环路接收系统激光器线宽以及噪声对相干光通信的影响。对环路带宽进行了优化取值,分析了在最小误差方差下环路对激光线宽的要求。最后给出了不同比特光子数下,接收系统误码率与输入信噪比关系。更多还原

【Abstract】 In this paper,on the basis of OPLL principle with QPSK modulation,the impact of laser line-width and noise on the coherent optical communication were systematically analyzed.The value of the loop bandwidth was optimized,under the condition of the minimum phase-error,the requirement for laser line-width was analysed,Finally,under the circumstance of different bit number of photons.the relationship between the error rate of the QPSK receiving system and the input SNR.更多还原