磁光非线性光纤中光参量增益的研究  

Optical Parametric Gain in the Magneto-optic Nonlinear Fiber

作　　者：李述标[1] 武保剑[1] 文峰[1] 

机构地区：[1]电子科技大学通信与信息工程学院光纤传感与通信教育部重点实验室,成都611731

出　　处：《光子学报》2013年第1期29-33,共5页Acta Photonica Sinica

基　　金：国家重点研究发展计划(No.2011CB301703);国家高技术研究发展计划(No.2012AA011304);国家自然科学基金(No.61271166)资助

摘　　要：将光纤中磁光效应和非线性效应作为微扰,推导了磁光四波混频的耦合模方程.通过解析解研究了各向同性磁光非线性光纤的参量过程,并指出利用磁光耦合系数的色散特性可以实现四波混频的相位匹配.同时,采用龙格-库塔法分析了在线双折射磁光非线性光纤中,忽略费尔德常量的波长依赖性时,左旋圆偏振光参量增益的磁控特性,指出了实验中采用较高费尔德常量的非线性光纤的必要性.研究表明:1)对于低线双折射磁光非线性光纤,优化双折射大小可以获得最大的参量增益;2)根据参量增益对磁光耦合系数的单调依赖特性,适当选择光纤长度、泵浦功率以及输入导波光的偏振态,可使参量增益的磁可调范围大大提高.The coupled-mode equation for the magneto-optic four-wave mixing existing in a fiber with magneto-optic and nonlinear effects as perturbation is derived. The parametric processes of the isotropic magneto-optical nonlinear fiber are analytically investigated, and the phase matching condition can be achieved by the dispersion characteristics for the magneto-optic coupling coefficient. In the case that the wavelength dependency of fiber Verdet constant is negligible, the magnetic control characteristics of fiber parametric gain are analyzed for the incident left-hand circular polarization. The necessity of using magneto-optic and nonlinear fiber with high Verdet constant in the experiments is pointed out. The results show that, 1） for the magneto-optical nonlinear fiber with low birefringence, the maximal parametric gain can be obtained by optimizing the magnitude of fiber birefringence; 2） from the monotonic dependence of parametric gain on the magneto-optic coupling coefficient, the magnetic adjustability of parametric gain can be improved by appropriately choosing fiber length, pump power and polarization states of guided optical waves.

关 键 词：非线性光学 磁光效应 磁光非线性光纤 参量增益 

分 类 号：O437[机械工程—光学工程] TN2[理学—光学]