Research Of Solit's Transmission Characteristics In Optical Fiber Communication System

Soliton is the use of optical fiber nonlinear effects caused by optical pulse broadening caused by the formation of equilibrium.In anomalous dispersion regime,optical soliton pulse can be achieved without distortion of high capacity long distance transmission,a new all-optical communication technology,is the most promising future of communication.Compared to traditional fiber-optic communication,optical soliton communication speed transmission out of the shackles of electronic relay devices because electron relay to the received optical signal shaping,amplification,error corrected and then re-launched,the process to go through photoelectric conversion speed is far inferior to all-optical signal transmission speed.So fiber loss gained and signalled will be transmitted so long without deformation,and it can reduce the dispersion, increase bandwidth and decrease optical fiber coupling loss caused by the existing communication devices. The transmission capacity and transmission distance are increased greatly.As is not used as electronic components, optical soliton communication system can work under high temperature.Optical soliton communication,as the next generation optical fiber communication system, can achieve all-optical communication, conversion without light and electricity, long distance, large-capacity transmission. It will be a revolution in optical communication technology.With the application of WDM,the relay distance and bit rate is also increasing. With the improvement of transmission speed, some factors such as fiber loss, fiber nonlinear,initial chirp, polarization membrane dispersion have become the focus of people's attention.The factors which affect the capability of optical communication system are analyzed and studied in this paper.The paper obtains the numerical solutions of NLS and discusses the initial chirp that influences the capability of optical-soliton system in the communication system.The results show that the soliton pulse is affected by the initial chirp and the second-order dispersion.In the range of Cβ2> 0,chirped soliton pulse has broadened faster than non-chirped pulse.While in the range of Cβ2<0 the initial phase of the transmission, a brief pulse compression process, and with the propagation distance, due to the major role in the rapid dispersion broadening,also studied the effects of polarization mode dispersion characteristics of optical soliton transmission as the soliton is a result of nonlinear effect and second-order GVD balance. When there is PMD,delay differece produces between the two polarization components.With distance increasing,soliton pulse is broadened and peak is shifted.Soliton pulses in the formation of a small dispersive wave.The original balance is destroyed, leading to the broadening of soliton pulse. Combined with synchronous modulation technique and sliding-frequency filtering rechnique discussed aboved to ristrict the negative factors inhibiting the program,and making use of synchronous modulation of the PMD compensation, the pulse transmission distance is doubled and the transmission performance of the pulse is improved effectively.