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在白光保偏光纤(PMF)偏振耦合系统中,光纤双折射色散会引起干涉条纹包络随着光纤长度展宽,从而导致空间分辨率降低,光纤测量范围变小。为了减小双折射色散的影响,提出一种基于频域变换的色散相位补偿方法,通过干涉主极大包络与耦合点包络的宽度比求得相位补偿因子,并与非线性色散相位谱相乘,通过傅里叶逆变换得到色散补偿信号。实验分别对400m和1000m PMF进行了测试,得到光纤双折射色散系数为0.0116×10-9 ps/(nm.km),将测试系统对PMF 1000m处耦合点的空间分辨率由62.85cm提高到6.03cm,实现了对长距离PMF偏振耦合系统的动态色散补偿。
In PMF polarization-coupled systems, fiber birefringence dispersion causes the fringe envelope to broaden along with the fiber length, resulting in reduced spatial resolution and smaller fiber measurement range. In order to reduce the influence of birefringence dispersion, a method of dispersion phase compensation based on frequency domain transform is proposed. The phase compensation factor is obtained by the width ratio of interference main envelope and coupling point envelope, and is compared with the nonlinear dispersion phase spectrum By multiplication, the dispersion compensation signal is obtained by inverse Fourier transform. Experiments were carried out on the 400m and 1000m PMF respectively, and the birefringence dispersion coefficient of the fiber was 0.0116 × 10-9 ps / (nm.km). The spatial resolution of the coupling point between the test system and the PMF 1000m was increased from 62.85cm to 6.03 cm, to achieve a long-distance PMF polarization coupling system of dynamic dispersion compensation.