Tanemura Takuo, Kikuchi Kazuro
Research Center for Advanced Science and Technology, University of Tokyo, 4-6-1 Komaba, Meguro-Ku, Tokyo 153-8904, Japan.
Opt Lett. 2006 Apr 1;31(7):882-4. doi: 10.1364/ol.31.000882.
The intensity-dependent polarization rotation caused by the self-induced nonlinear birefringence in a long twisted fiber is studied numerically and experimentally. By using a 1 km length of twisted fiber, we show that the effect of ellipse rotation accumulates monotonically as if the fiber were perfectly isotropic. Such behavior cannot be observed in a typical nontwisted fiber with randomly varying birefringence and is a unique feature of the twisted fiber, in which the large circular birefringence plays an essential role of preserving the handedness of elliptical polarization. We demonstrate a novel Faraday-mirror configuration to ensure automatic polarization alignment, which is directly applicable to achieving a simple and stable intensity discriminator.
对长扭曲光纤中由自感应非线性双折射引起的强度依赖型偏振旋转进行了数值和实验研究。通过使用1公里长的扭曲光纤，我们表明椭圆旋转效应单调累积，就好像光纤是完全各向同性的一样。在具有随机变化双折射的典型非扭曲光纤中无法观察到这种行为，这是扭曲光纤的独特特征，其中大的圆双折射在保持椭圆偏振的旋向方面起着至关重要的作用。我们展示了一种新颖的法拉第镜配置，以确保自动偏振对准，这直接适用于实现简单稳定的强度鉴别器。
