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论述了新型在线式与偏振无关薄膜光隔离器的设计、性能分析及实验结果。我们选择了TbBi石榴石磁光薄膜作为45°法拉第旋转器、两个YVO4材料制成的楔形双折射晶体作为分束器及会束器，准直聚焦系统采用的是短焦距小像差的p／4自聚焦棒。整个器件体积小，结构简单，正向损耗小于1dB，反向损耗大于30dB．采用矩阵光学分析了光隔离器正向插入损耗和反向隔离与法拉第旋转器旋光角精度及两个楔形双折射晶体主光轴的相对方位角的偏差的关系。
The design, performance analysis and experimental results of the new on-line and polarization-independent thin film optical isolator are discussed. We chose TbBi garnet magneto-optical thin film as a 45 ° Faraday rotator, wedge-shaped birefringent crystal made of two YVO4 materials as a beam splitter and a beam splitter, and a collimating focusing system using a short focal length small aberration p / 4 self-focusing stick. The entire device is small, simple structure, the forward loss of less than 1dB, reverse loss greater than 30dB. Matrix optics was used to analyze the relationship between the forward insertion loss and reverse isolation of the optical isolator and the accuracy of the Faraday rotator rotation angle and the relative azimuth of the main optical axes of the two wedge-shaped birefringent crystals.