利用光子晶体光纤产生光孤子压缩态

利用强度相关的自相位调制效应从实验中得到了光孤子幅度压缩态.实验装置主要部分为非对称的Sagnac干涉仪，光脉冲通过PC/FC接头连接到分光比为90:10的耦合器，耦合器与40m长的光子晶体光纤形成干涉环.在合适的输入功率下，干涉仪的输出端可以得到光孤子幅度压缩态.利用零拍平衡探测系统对光孤子幅度压缩态进行了检测，检测部分包括50/50分束器、2个低噪声光电探测器和1个加减法器与频谱分析仪.测得输入Sagnac环和输出Sagnac环光强分布曲线，以及以散粒噪声为基准的信号噪声的相对曲线，计算产生的光孤子振幅压缩态压缩率为1.6 dB.实验数据分析表明，选择合适的光子晶体光纤，能进一步增大压缩率.

Generation of Optical Soliton Squeezed State Using Photonic Crystal Fiber

Optical soliton amplitude squeezed state caused by intensity correlation self-phase modulation effect was generated experimentally. The main part of experiment system was asymmetric Sagnac interferometer. Pulsed laser was connected to a coupler with splitting ratio of 90:10 by PC/FC connector. The coupler and 40-meter photonic crystal fiber composed interference loop. At proper input power, optical soliton amplitude squeezed state could be observed at output terminal of the interferometer. Balanced homodyne detection system composed of 50/50 beam splitter, two low-noise photo detectors, adder/subtracter, and spectrum analyzer was used to detect the squeezed state. Intensity distribution curves of input and output of the Sagnac loop were drawn, and the signal noise curve using shot noise as reference was obtained. The compressibility was 1.6 dB. Analysis on experimental data shows that it’s possible to improve compressibility further by choosing proper photonic crystal fiber.