Wen Feng, Wu Bao-jian, Luo Te
Key Lab of Broadband Optical Fiber Transmission and Communication Networks of the Ministry of Education, University of Electronic Science and Technology of China, Chengdu 611731, China.
Appl Opt. 2011 Jul 1;50(19):3123-7. doi: 10.1364/AO.50.003123.
An all-fiber magneto-optic Sagnac interferometer (AFMOSI) utilizing intrinsic Faraday effects in highly nonlinear fibers (HNLFs) is presented for the first time (to our knowledge). The performance of the AFMOSI was investigated theoretically by use of the transfer matrix approach. The theoretical results were verified by the experiment employing an all-fiber magnetic-optic cell that consists of a 30 m long HNLF and a 92 mm diameter toroid coil. Our experiments show that, when the linear birefringence of the AFMOSI is adjusted to 0, the change of the transmission can be over 10 dB as the magnetic induction B increases from 0 to 180 Gs. The sensitivity of the AFMOSI is determined by the coupling ratio of the fiber coupler, the loss of the loop, and the length of the HNLF. Most importantly, the linear birefringence of the AFMOSI can be obtained by evaluating its performance of magnetic field response. This is very useful for studying the influence of the linear birefringence on the performance of a nonlinear optical loop mirror that is controlled by the Faraday effect.
据我们所知，首次提出了一种利用高非线性光纤（HNLF）中的固有法拉第效应的全光纤磁光萨格纳克干涉仪（AFMOSI）。采用传输矩阵法对AFMOSI的性能进行了理论研究。通过使用由30米长的HNLF和直径92毫米的环形线圈组成的全光纤磁光单元进行实验，验证了理论结果。我们的实验表明，当将AFMOSI的线性双折射调整为0时，随着磁感应强度B从0增加到180高斯，传输变化可超过10分贝。AFMOSI的灵敏度由光纤耦合器的耦合比、环路损耗和HNLF的长度决定。最重要的是，可以通过评估其磁场响应性能来获得AFMOSI的线性双折射。这对于研究线性双折射对由法拉第效应控制的非线性光学环形镜性能的影响非常有用。
