The Dispersion Technology Research Of Long Distance And High-speed Communication System

With the improvement of the transmission rate, the growth of the transmission distanceand the transmission bandwidth, dispersion and nonlinearity effects on optical fibercommunication are becoming increasingly significant, which restricted the development ofmodern optical fiber communication， so the research of dispersion compensationtechnology becomes more and more important. At present, the mature dispersioncompensation technologies mainly are Dispersion Compensation Fiber technology, OpticalFiber Grating compensation technology and so on. The new technologies are New Codingtechnology, Electric Dispersion Compensation technology, Forward Error Correction, etc. Inthis paper, a new compensation technology-Photoelectric Dispersion Compensationtechnology was proposed basing on full analysis of the Dispersion Compensation Fiber andFiber Grating compensation technologies’ advantages and disadvantages. Compared withother dispersion technology, it has the advantages of low cost, easy to use, and it cangreatly improve the system performance. The application of this new technology inhigh-speed optical fiber communication system was focused on discussion. The main workis as follows:Firstly, the principle of dispersion compensation was introduced and the influence ofdispersion and nonlinearity effects on modern optical fiber communication were analyzedaccording to the Nonlinear Schrodinger Equation. For the same kind of dispersioncompensation technology, the different dispersion management plan will produce thedifferent compensation effect.Secondly, the existing technologies of dispersion compensation were introduced and anew compensation technology which called Photoelectric Dispersion Compensationtechnology was proposed through analysising the deficiencies of the DispersionCompensation Fiber and Fiber Grating compensation technologies. The Electric DispersionCompensation technology has different equalizer structure and algorithm. In this paper, theequalizer structure which the FFE is combined with DFE and minimum mean squarealgorithm are adopted.Finally, the contrast method was used to simulate the application of PhotoelectricDispersion Compensation technology in optical communication system of G.652opticalfiber whose rate is10Gbit/s. The electronic equalizer optimization parameters were studiedfirstly to find out under what conditions the electrical domain equalizer can improve theperformance of the system. The Q value changing with the input power in optical compensation technology system was studied secondly to analyze the effects of dispersionand nonlinear effects in optical fiber communication. Further more, the superiority ofcompensation technique and optical dispersion compensation technology were compared inthe same condition.The results show that the Photoelectric Dispersion Compensation technology cangreatly improve the performance of the system and has a clear advantage on the nonlinearresistance. In the case of higher optical power into the fiber, the system can still maintainhigh Q value. Especially in WDM systems, the Photoelectric Dispersion Compensationtechnology can still play its advantages, and greatly improve the system transmissionperformance. Photoelectric dispersion compensation technology is very meaningful toupgrade and expansion of existing communication system and to meet the requirements oflong distance high speed optical fiber communication.