基于光子晶体光纤中简并四波混频效应的高效可调谐偏振不敏感波长变换器(英文)  

A High-Efficiency Tunable Polarization-Insensitive Wavelength Convertor Based on Degenerate Four-Wave Mixing in a Highly Nonlinear Photonic Crystal Fiber

作　　者：黄新宁[1,2] 谢小平[1] 赵卫[1] 韩彪[1] 冯欢[1] 

机构地区：[1]中国科学院西安光学精密机械研究所瞬态光学与光子技术国家重点实验室,陕西西安710119 [2]中国科学院大学,北京100049

出　　处：《中国激光》2014年第5期124-128,共5页Chinese Journal of Lasers

基　　金：国家自然科学基金重点项目(61231012)

摘　　要：实验验证了一种结构简单、变换效率高的可调谐偏振不敏感全光波长变换器。光子晶体光纤由于其特殊的纤芯结构,能够保有较高的双折射效应。通过调节抽运光的偏振态,使之与光子晶体光纤的双折射轴成45°夹角入射,则此时信号光与抽运光在光子晶体光纤中进行简并四波混频过程时,其变换效率对信号光偏振态的随机变化不敏感,闲频光输出功率几乎保持不变。实验结果表明,所搭建的全光波长变换器在25nm变换范围内,闲频光偏振敏感度低于0.6dB,变换效率优于-15dB(峰值可达-7.6dB),输出闲频光的光信噪比优于40dB,长时间工作性能稳定,可实现开机自启动,是一种实用性强的偏振不敏感全光波长变换器。A high-efficiency tunable polarization-insensitive all-optical wavelength convertor for 10 Gb/s return-to- zero on-off keying （RZ-OOK） signals using degenerate four-wave mixing （FWM） in a highly nonlinear photonic crystal fiber （PCF） is demonstrated. The residual birefringence in the 50 m dispersion-flattened PCF with 11 W l-kin nonlinear coefficient guarantees the FWM-based wavelength conversion to be polarization-insensitive when the pump polarization is exactly at 45°to the birefringent axes of the PCF. Experimental results show that with 45°pump launch, the polarization dependence of FWM in the PCF can be decreased to less than 0. 6 dB over the entire 25 nm conversion bandwidth. The optical signal-to-noise ratios （OSNR） of the converted signals are better than 40 dB and the conversion efficiencies are better than --15 dB over the conversion range with 10 Gb/s signal polarization-scrambled.

关 键 词：非线性光学 波长变换器 四波混频 光子晶体光纤 

分 类 号：O437[机械工程—光学工程]