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一、引言本文研究相干光纤通信系统中ASK.PSK.FSK三种调制光信号通过单模光纤的传输特性,和激光器噪声对相干光通信系统性能的影响。通过建立相干光信号的数学模型,和建立存在频率色散的单模光纤作为通信信道的传输模型,本文在理论上给出了相干光信号从产生、传输到接收的完整数学描述,并结合各种具体的调制-解调方式推导出它们的误码率计算公式。研究结果表明,单模光纤频率色散对ASK.PSK.FSK三种光信号传输的影响是不
I. INTRODUCTION This paper studies the transmission characteristics of three modulated optical signals of ASK.PSK.FSK in a coherent optical fiber communication system through a single mode optical fiber and the influence of laser noise on the performance of the coherent optical communication system. By establishing a mathematical model of coherent optical signals and establishing a single-mode optical fiber with frequency dispersion as the transmission model of the communication channel, a complete mathematical description of the coherent optical signals from generation, transmission to reception is given in this paper. Specific modulation-demodulation method to derive their error rate calculation formula. The results show that the single-mode optical fiber frequency dispersion ASK.PSK.FSK optical signal transmission is not affected