新型光隔离器结构设计与实验性能测试(英文)

Design and experimental setup of an innovative optical isolator

提出一种功能复用光隔离器设计方案。在传统光隔离器中加入了透镜对,两透镜间拥有一个相邻共焦面,具有空间光交叉功能,能实现功能复用光隔离器输入输出多尾纤之间的对应耦合;二者结合组成空间复用功能系统,使光隔离器具有功能复用的作用。该光隔离器的主要性能测量结果表明,所设计的1550nm双通道功能复用光隔离器两个通道的插入损耗分别为0.43dB和0.31dB,隔离度分别为43dB和40dB,两个功能隔离器之间的串扰都大于60dB,达到了隔离器需要满足的性能指标,在低插损、高隔离的基础上具有功能复用效用。

A new type of optical isolator with double core fiber is proposed. The optical isolator has been fabricated with two fiber tips and a lens pair. The lens pair has a confocal plane in between with same optical axis direction and optical cross function. Integrated with two fiber tips, the function of optical isolator is duplicated in comparison with conventional optical isolator with single fiber tip. This isolator couples optical radiation in one direction from two fibers to the corresponding double output fibers. The innovative isolator with dual core fiber collimator is assembled and tested at 1550 nm wavelength. Experimental results show that the forward insertion loss from two channels reaches 0.43 dB and 0.31 dB, loss from backward isolation reaches 43 dB and 40 dB respectively. The cross talk of both channels achieves 60 dB. It's the most important that the isolator, which features duplicated function and good performances, also has a low cost and a small dimension comparatively.