Study Of The Propagation Property Of Optical Solitons In Ultrahigh-speed Communication

The technology of optical-soliton communication is the long distance communication, and it becomes the preferable scheme of new generation of the rapid velocity and long distance. It accomplishes stability transmission by what strong pulse products nonlinear suppression compensating broadening of pulse-dispersion in optical fiber. Normal optical-fiber must build a relay station to reform, amplify, and check mistaken code. Then signal will be emitted again. But communication of the soliton do not use relay station. Only fiber loss gained, signal will be transmitted very long without deformation. With the application of WDM in optical-soliton communication, the bit rate and relay distance is also increasing. With the improvement of speed, some factors ignored in the low-speed optical communication system have to be noticed now. The factors affecting the the capability of ultrahigh-speed optical communication system are analyzed and studyed in this paper, and some plans are devised and discussed to restrain the factors.On the theoretic basis that soliton pulse propagation meets the nonlinear Schrodinger equation(NLS) in fiber, the paper obtained the numerical solutions of NLS and the high order nonlinear Schrodinger equation(HONLS) and discussed the factors that influence the capability of optical-soliton system in the ultra-speed communication system. Dispersion Decreasing Densely Dispersion Management (4DM) is studied to improve the property of optical-soliton communication system by the combination of the advantages of the Densely Dispersion Management Soliton (DDMS) and the Dispersion Decreasing fibre (DDF). By the result of the numerical simulation we draw the conclusion: after pulse pass through some evolvement courses its shape has little change, its width can mostly be renewed as beginning. The method can reduce the fluctuation of pulse width and improve the property of communication system.