The Equalization Of Cross-phase Modulation Between Multi-channel In High Speed Optical Communication

In the recent years,with the ever-increasing requirements of bandwidth by the new Internet applications and the business applications,the optical communication system based on coherent reception technology has been gained comprehensive attention of researchers.The coherent detection technology has several advantages such as high sensitivity and high spectrum efficiency,meanwhile,the transmission system can use advanced vector modulation form to improve system transmission capacity effectively,compensate all kinds of linear and nonlinear loss in transmission link and further increase transmission distance.By consulting information widely,this paper mainly researches on nonlinear compensation algorithm between channels based on DSP in high-speed coherent optical communication system,the main research contents are as follows:Firstly,this paper introduces thesis background and research value,introduces history of development and future prospect in coherent optical communication system,discusses composition structure and core algorithm based on DSP coherent reception technology.Secondly,this paper introduces chromatic dispersion,nonlinear effect and modeling analysis within multichannel in detail,by aiming at cross phase modulation equalization scheme between channels to do deep analysis on equalization algorithm and compensation performance of A-SSFM,S-SSFM,M-SSFM and I-SSFM structures,brings in walk-off effect,researches on chromatic dispersion nonlinear combined compensation scheme between WDM channels,compared with conventional linear compensation algorithm,which lets Q value improve almost 4 dB,and proposes optimized adaptive scheme.Finally,from the angel of step and BP algorithm structure,this paper researches on improvement scheme of DBP in WDM system,makes simulated analysis on the effect of system performance by different step numbers and different transmission steps and searches the best reverse transmission distance algorithm within minimum bit error rate,after 15 iterations,the search algorithm converges to transmission distance of 100 km,using DBP equalization algorithm in the best reverse transmission distance can get lower BER,meanwhile,when the OSNR is larger,the superiority is more obvious;afterwards,this paper applies CBP algorithm to XPM equalization of WDM channel,which vastly increases step value and further decrease system BER.