关键词: 非线性光学, 频谱补偿, 对称分步傅立叶法, 超高斯脉冲, 消啁啾

Abstract:

The compensation and correction of spectrum of picosecond chirped super-Gaussian pulses generated by semiconductor lasers using a dispersion-shifted fiber (DSF) achieved a satisfied effect. Appropriate spectral compression can reduce inter-symbol interference and prevent the signal distortion induced by excessive spectral stretching，thus facilitating steady propagation of super-Gaussian pulses to a certain extent and increasing propagation distance of optical fiber system. We used the symmetrical split-step Fourier method (SSFM) during the study and, simulated numerically spectral evolution of the super-Gaussian pulse with initial chip of -3, pulse width of 10ps and peak power of 30W in the DSF. The results show that the DSF with length of 0.5m can greatly eliminate “red shift” chirps of the initial pulse.

Key words: nonlinear optics, spectral compensation, split-step Fourier method, super-Gaussian pulse, chirp elimination