Theoretical study on instantaneous linewidth of Fourier-domain mode-locked fiber lasers
Theoretical study on instantaneous linewidth of Fourier-domain mode-locked fiber lasers
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DOI：
10.1016/j.optcom.2012.06.072
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发表时间：
2012-11
影响因子：
2.4
通讯作者：
Chenghou Tu;Yixin Deng;Meng-Qiang Cai;Zhangchao Huang;Yongnan Li;Fu‐yun Lu;E. Li
中科院分区：
文献类型：
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作者：
Chenghou Tu;Yixin Deng;Meng-Qiang Cai;Zhangchao Huang;Yongnan Li;Fu‐yun Lu;E. Li
用波长重建法代替数值求解非线性薛定谔方程，数值模拟了傅立叶域锁模光纤激光器的工作过程。研究了滤光片带宽和光纤色散引起的相对时延对FDML光纤激光器瞬时线宽的影响。结果表明，瞬时线宽随滤波带宽和相对时延的增大而展宽。当滤光片的带宽为0.024 nm时，最窄的瞬时线宽为0.042 nm，最宽的瞬时线宽为0.042 nm。我们对FDML的瞬时线宽的振荡给出了一个理解。所得结果可用于评估FDML光纤激光器的性能。
We have numerically simulated the operation of the Fourier-domain mode-locked (FDML) fiber laser based on the wavelength reconstruction method instead of numerical solving the nonlinear Schrödinger equation. We studied the influences of the filter bandwidth and the relative time delay caused by the fiber chromatic dispersion on the instantaneous linewidth of the FDML fiber laser. The results show that the instantaneous linewidth broadens as the filter bandwidth and the relative time delay increase. When the filter has the bandwidth of 0.02nm, the narrowest and broadest instantaneous linewidths are 0.024 and 0.042nm, respectively. We give an understanding for the oscillation of the instantaneous linewidth of FDML. The presented result can be used to evaluate the performance achievable in the FDML fiber lasers.