采用光子晶体光纤构成非线性光学环路镜,利用非线性环路镜中信号光与控制光之间交叉相位调制效应实现全光开关.讨论了光子晶体光纤结构参数对其非线性的影响,建立了基于光子晶体光纤非线性环路镜光开关的理论模型,研究了光开关的透过特性及影响光开关性能的因素.研究结果表明,基于光子晶体光纤非线性环路镜的光开关,可以在较短的环长和较低的开关功率下实现高速光开关操作,其开关特性可由控制光功率灵活调控.光子晶体光纤非线性环路镜光开关为实现用于高速光通信系统中的光开关技术提供了一种重要思路.
An all-optical switch made up of a nonlinear optical loop mirror (NOLM) and based on photonic crystal fiber (PCF) is presented. With the crossing phase modulation (XPM) effect between the signal pulse and the control pulse, it can be used as an all-optical switch. Characteristics of PCF caused by the construction parameters are discussed. The theoretical model is built up and the transmittance characteristics of the all-optical switch studied using such a model. The performance of the nonlinear optical loop mirror based on photonic crystal fiber is discussed. Results of study showed that the high-speed switching effect can be obtained with shorter loop length and lower control power of NOLM based on PCF and characteristics of the optical switch can be controlled flexibly by the power of the control pulse. It is an important method for the all-optical switch used in high-speed optical communication system using nonlinear optical loop mirror based on photonic crystal fiber.