色散光纤中超连续谱的产生及多波长输出

超短脉冲在高非线性光纤中传输过程遵循非线性薛定谔方程,因此可通过分步傅里叶变换的方法对此过程进行数理模拟和分析。借用MATLAB工具软件产生一个高斯皮秒脉冲,研究脉冲通过色散光纤之后频谱得以展宽,从而能够通过阵列波导光栅(AWG)进行分波之后得到多波长输出的超连续谱。结果表明:使超连续谱频谱得以展宽的因素有很多,其中群速度色散值对其影响较为显著。对光纤及脉冲的各参数进行优化调节之后,再对色散参量D0进行微调,超连续谱将得到更好地修整优化,频谱变得更宽且平坦稳定。

Generation and Multi Wavelength Output of Super-Continuum Spectrum in Dispersion Fiber

Transmission process of ultrashort pulse in high nonlinear fiber follows the nonlinear Schrodinger equation, and thus this process may be simulated and analyzed mathematically through the split-step Fourier method. A Gauss picoseconds pulse is generated by MATLAB software, and after pulse transmitting over dispersion optical fiber,the spectrum could be broadened,and thus super-continuum spectrum of multi wavelength output be obtained via AWG (Arrayed Waveguide Grating). Results show that the factors making super-continuum spectrum broadened are various, and the group velocity dispersion plays a significant role. After optimal regulation of fiber and pulse parameters,and then fine-tuning of the dispersion parameter D0, super-continuum spectrum may receive better optimization, and the spectrum becomes wider while keeping flat and stable.