单点相移光纤光栅光谱特性的研究与应用

Research and application of spectrum characteristics of single phase-shifted fiber Bragg grating

可调谐窄线宽掺铒光纤激光器具有线宽窄、噪声低等优点,在光纤通信、光纤传感、相干探测和合成等方面有广泛的应用。根据传输矩阵法,利用Matlab软件仿真出单点相移光纤光栅的透射谱,通过对不同相移量、不同相移点位置、不同光栅的长度以及不同纤芯有效折射率的单点相移光纤光栅透射谱进行分析,得到了影响其相移峰的透射率、线宽、位置的主要因素,并提出了一种利用相移量为π且相移点在中点的相移光纤光栅作为滤波窗口的可调谐窄线宽掺铒光纤激光器的方案。

Narrow linewidth fiber lasers have lots of applications in fiber communication,fiber sensors,coherent detection and combination because of its narrow linewidth and low noise.According to the transfer matrix method,we simulated the transmission spectrum of single phase-shifted fiber grating by Matlab,analyzed the transmission spectrum of single phaseshifted fiber grating with the different phase-shifted magnitudes,locations,fiber grating lengths and the different refractive indicators of the core,and got the main factors affecting the transmittance,linewidth and position of the phase-shifted peak.Furthermore,we proposed a scheme of tunable narrow linewidth erbium-doped fiber laser using aphase-shifted fiber grating with aπphase-shifted and a location of phase-shifted at the midpoint as the filter window.