| By introducing the principle of high-speed optical time division multiplexing system, we present the characteristics of higher-order dispersion compensation in ultra high-speed OTDM system, and derive optimum transmission parameters under the effects of source chirping and residual second-order dispersion, which would be helpful to provide some theoretical suggestion for high-bit-rate optical transmission system. The main contents are as follows:1.The main principles and key technology in high-speed OTDM system have been reviewed in detail.2.the progress in experiment of dispersion compensation in high-speed OTDM system has been introduced, especially for fourth-order dispersion.3.The nonlinear Shodinger equation with up to fourth-order dispersion and its' numerical simulation methord are presented.4.By using the expression for computing the output pulse's rms time width in an optical fiber link with up to fourth-order dispersion (FOD), we present an expression of maximum fiber-link length, at which the output pulses can return to its original rms time width, in an optical fiber link with up to fourth-order dispersion. The fourth order dispersion is compensated by combination of the effects of proper source chirping and negative residual second-order dispersion. The interesting fact is that the optical pulses can. restore itself at a longest distance even in case of chirp parameter being positive, as well as being negative traditionally. The validity of the analytical formulas is also confirmed by split-step Fourier numerical stimulation.
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