Basic Study On Transfer Characteristic Of Optical Fiber

The optical pulse's transportation in the single-mode optical fiber is elementarily researched in the paper. It's known from the transportation function that the dispersion can only influence the phase of optical pulse's spectrum, which can be easily described by a frequency transfer function. The dispersive influence, especially the influence of the second-order and third-order dispersion, is researched first. In this part, the influence of the third-order dispersion on the super-Gaussian pulse is mainly discussed, and the difference between Gaussian and super-Gaussian pulse is also qualitatively discussed; the effect of the initial chirps is researched.As the dispersive influence can be easily described by a frequency transfer function, the feasibility of measuring the function with the G-S algorithm is researched numerically in the next part. From the results of simulation with fibers with different length and pulses with different width, it's known that the convergence of the algorithm is related to the difference between the input and output pulse. Then, the influence of attenuation and self phase modulation of fiber is discussed, and the influence of the delay phenomenon and fitted polynomial is also analyzed.At last, the evolution of Gaussian pulse's shape and spectrum in single-mode fiber with the existing of both the self phase modulation and the second-order dispersion is researched on the setting of coherent light array. On the basis of that, some conditions which should be met by the single-mode fiber used in the coherent light array system are given out.