基于光子晶体光纤的偏振不敏感波长变换理论实验研究  

Theoretical and Experimental Research of Polarization Insensitive Optical Wavelength Convertor in a Photonic Crystal Fiber

作　　者：胡辉[1,2,3] 段弢[1] 钱凤臣[1,2] 黄新宁[1,2] 苏玉龙[1,2,3] 汪伟[1,2] 韩彪[1,2] 冯欢[1,2] 谢小平[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 [3]西安交通大学理学院,陕西西安710049

出　　处：《中国激光》2015年第B09期162-168,共7页Chinese Journal of Lasers

基　　金：国家自然科学基金（61231012）

摘　　要：实验验证了一种结构简单的10Gbit／s非归零信号（NRZ）通过高非线性光子晶体光纤（PCF）的四波混频（FWM）效应实现了单抽运偏振不敏感和宽范围可调谐全光波长转换。利用50m光子晶体光纤较高的双折射效应，固定抽运光的偏振态与高非线性光子晶体光纤的双折射轴成45°夹角入射，信号光与抽运光在光子晶体光纤中进行四波混频时，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28nm变换范围内，闲频光偏振敏感度低于1dB，随着10Gbit／s的信号光偏振态的变化，波长变换效率优于-13dB的偏振不敏感全光波长变换器，闲频光信号Q因子大于7。A single pump polarization-insensitive and widely tunable all-optical wavelength conversion for 10 Gbit/s non-return-to-zero （NRZ） signal is experimentally demonstrated by means of four-wave-mixing （FWM） in highly nonlinear photonic crystal fiber （PCF）. The residual birefringence in the 50 m dispersion-flattened 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 the polarization dependence of FWM in the PCF can be decreased to be less than 1 dB over 28 nm of wavelength tunable operation. The conversion efficiencies are better than -13 dB and the Q factor of idler signal is larger than 7 over the conversion range with signal polarization change.

关 键 词：光纤光学 波长变换 偏振不敏感 光子晶体光纤 四波混频 

分 类 号：O438.1[机械工程—光学工程]