论文部分内容阅读
针对相干光通信系统中光纤非线性效应,本文以单载波偏振复用系统为例,从理论上分析了其光纤非线性效应,并推导出了非线性薛定谔方程。提出了一种基于数字反向传输(DBP)的光纤非线性效应补偿技术,建立了分步傅里叶方法的数学模型,同时给出了基于分步傅里叶方法的数字反向传输实现过程。为验证基于DBP的DP-16QAM相干光通信非线性补偿技术的有效性,搭建了112Gb/s DP-16QAM仿真系统并进行了相关的仿真实验。仿真分析了数字反向传输过程中加权系数、误码率、补偿步长、入纤功率、传输距离之间的关系。仿真结果表明:对于DP-16QAM传输系统,存在一个最优的加权系数;并且补偿步长越小,系统的入纤功率越高和误码率越小,系统的传输性能越好。
Aiming at the nonlinear effect of optical fiber in coherent optical communication system, this paper takes the single-carrier polarization multiplexing system as an example, analyzes the nonlinear effect of optical fiber theoretically and deduces the nonlinear Schrödinger equation. A nonlinear optical effect compensation technique based on digital reverse transmission (DBP) is proposed. The mathematical model of the step-by-step Fourier method is established. At the same time, the implementation of the digital reverse transmission based on the step-by-step Fourier method . To verify the effectiveness of DPP-16QAM coherent optical communication nonlinear compensation based on DBP, a 112Gb / s DP-16QAM simulation system was built and related simulation experiments were carried out. The relationship between weight coefficient, bit error rate, compensation step length, fiber input power and transmission distance is simulated and analyzed in the process of digital reverse transmission. The simulation results show that there is an optimal weighting coefficient for the DP-16QAM transmission system. And the smaller the compensation step, the higher the fiber input power and the bit error rate, the better the transmission performance of the system.