一种基于非线性光纤环镜开关特性的超短光孤子产生方法  

Generation of Bright and Dark Soliton Trains from Continuous-Wave Light Using the Switching Characteristics of a Nonlinear-Optical Loop Mirror

作　　者：曹文华[1] 刘颂豪[2] 郭旗[2] 

机构地区：[1]五邑大学电子与信息工程系,江门529020 [2]华南师范大学量子电子学研究所,广州510631

出　　处：《光学学报》2001年第12期1409-1416,共8页Acta Optica Sinica

基　　金：广东省自然科学基金 (990 831)

摘　　要：提出了一种利用非线性光纤环镜的开关特性将连续波同时转化为亮孤子和暗孤子的新方法 ,即让连续波和另一波长的调制脉冲串共同耦合入光纤环镜 ,交叉相位调制使得一部分连续波被环镜透射 ,其余部分被反射 ;再让透射波和反射波分别在反常色散光纤和正常色散光纤中传输 ,自相位调制和群速度色散之间的相互作用使得透射波和反射波分别演化为亮、暗孤子。数值计算表明 ,该方法不仅可产生脉宽比调制脉冲窄、重复频率比调制脉冲高的亮孤子和暗孤子 ,而且几乎可将全部的连续波能量转化为孤子能量。A novel technique for the simultaneous generation of bright and dark soliton trains from continuous wave (CW) light is proposed and demonstrated numerically. It is based on the optical switching characteristics of a nonlinear optical loop mirror (NOLM) through which the CW signal is switched by a pump pulse train at another wavelength by the creation of cross phase modulation induced phase bias between the counter propagating CW components. The transmitted and reflected signals exiting from the NOLM can then evolve, respectively, into bright and dark soliton trains in fibers with the appropriate group velocity dispersion at the signal wavelength. Numerical simulations indicate that the generated solitons can be narrower than the pump pulse and that the repetition rate of the soliton trains can be higher than that of the pump pulses. Moreover, this technique permits the conversion of nearly all of the CW energy into the soliton train energy without generating pulse pedestals.

关 键 词：开关特性 超短光孤子 非线性光纤环境 交叉相位调制 连续波 亮孤子 暗孤子 光纤孤子 光纤通信 

分 类 号：TN25[电子电信—物理电子学] TN929.11