静磁表面波对高斯光脉冲的衍射特性研究  

Diffraction of Gaussian Optical Pulse Induced by Magneto-Static Surface Waves

作　　者：高翔[1] 武保剑[1] 

机构地区：[1]电子科技大学宽带光纤传输与通信网技术教育部重点实验室,四川成都610054

出　　处：《光学学报》2009年第7期1784-1789,共6页Acta Optica Sinica

基　　金：国家自然科学基金(60671027)资助项目

摘　　要：研究了磁光薄膜波导中线性啁啾高斯光脉冲与单频连续静磁波共线作用,给出了水平磁化时基于静磁表面波的磁光耦合方程。分别采用解析法和数值法计算了1310 nm和1550 nm两种光波长入射时衍射光的压缩特性,两种求解方法得到的结果一致。计算表明,衍射光脉冲的半峰全宽(FWHM)随相位失配因子的频率变化率和啁啾系数的增大而减小;在给定的计算参数下,与1310 nm波长对应的衍射光脉冲具有较大的峰值强度,但1550 nm波长输入时可以获得更窄的衍射光脉冲,因而1550 nm光脉冲更适于作为磁光脉冲压缩的脉冲源。文章还分析了磁损耗对衍射光脉冲的光强和输出脉宽的影响,对于普通的磁光薄膜,损耗基本上不影响光脉冲压缩效果。The collinear interaction between incident linearly chirped Gaussian pulses and single-frequency continuous microwave magneto-static surface waves （MSSW） in a horizontally magneto-optical film waveguide is studied and the coupling equations between optical pulses and MSSWs are presented, which can be used to analyze MSSW-based optical pulse signal processing. The diffraction characteristics of incident linearly chirped Gaussian pulses at 1310 nm and 1550 nm wavelength are in detail analyzed by the analytical and numerical methods respectively, and the same results are obtained. It is shown that, the full width at half maximum （FWHM） of diffracted optical pulses can be reduced by using a larger slope of phase-mismatching distribution or an incident optical pulse with large chirp parameter. The diffracted optical pulse corresponding to the 1310 nm carrier has a larger peak intensity, while the 1550 nm optical pulse is much more easily compressed for the case considered here. The influence of magnetic loss on output pulse intensity and pulse width is analyzed. For an ordinary magneto-optic （MO） film, the pulse compression effect is not basically affected by magnetic loss.

关 键 词：光通信 磁光信号处理 光脉冲压缩 磁光Bragg衍射效应 静磁表面波 磁损耗 

分 类 号：TN25[电子电信—物理电子学]