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在测试制备的100 GHz密集波分复用(DWDM)低偏振相关损耗的角度调谐滤光片时,其透射光谱的插入损耗和带宽的展宽现象会随着入射角度的加大而迅速增加,与理论设计不符。通过多光束干涉原理建立模型模拟,发现在倾斜入射时滤光片的透射光束的光斑会出现展宽和形变,使得位于接收端处的光准直器接收不到足够的透射光束,导致了光谱变形。根据分析结果设计了一种利用直角棱镜的光斑整形方案,能将展宽的椭圆光斑压缩回近似的圆形光斑。制备了一组直角棱镜整形装置,实验证明该设计能够在保持接收端光准直器位置固定的情况下有效地减小透射波形的损耗和半宽展宽现象,使角度调谐滤光片能达到理论设计中20 nm的可调谐范围。
When testing the prepared 100 GHz Dense Wavelength Division Multiplexed (DWDM) low polarization dependent loss angle tuning filter, its transmission spectrum insertion loss and bandwidth widening phenomenon will increase rapidly with the incident angle, and Theoretical design does not match. The multi-beam interference principle is used to establish the model simulation. It is found that the light spot of the transmitted light of the filter will be broadened and deformed at the time of oblique incidence, so that the light collimator located at the receiving end can not receive enough transmitted light beam, resulting in spectral distortion . According to the analysis results, a kind of spot shaping scheme using rectangular prism is designed, which can compress the widened ellipse spot back to the approximate circular spot. A set of right angle prism shaping device was prepared. The experiment proves that this design can effectively reduce the loss and half width broadening of transmission waveform while keeping the position of the light collimator at the receiving end fixed, so that the angle tuning filter can reach the theory Tunable range of 20 nm in the design.