This paper analyzes the characteristic of data, designs and implements a grid datatransfer subsystem based on FTP protocol, which abets multithreading download, break point transfer, exception identify and connection maintain.

The paper conclude some major factors which influence the dark soliton transmission system, such as initial phase, random dispersion, stochastic gain variation, intrapulse Raman scattering and time jitters in arrival.

The model of stochastic dispersion variation is built for a dark soliton transmission system, and its influence is studied on the arrival time jitters of the dark soliton to the detecting window.