多频微波信号对导波光脉冲的磁光衍射研究  

Magneto-optic Diffraction of Guided-wave Optical Pulses with Multi-frequency Microwave Signals

作　　者：解宝祥[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：《磁性材料及器件》2010年第3期14-18,共5页Journal of Magnetic Materials and Devices

基　　金：国家自然科学基金资助项目(60671027);四川省应用基础研究资助项目(07JY029-089)

摘　　要：根据磁光微扰理论,研究了小信号情形下多频静磁波信号对脉冲导波光的磁光Bragg衍射过程,给出了它们相互作用的耦合模方程,此方程也适用于多频静磁波与连续导波光以及单频静磁波与脉冲导波光的作用。计算表明,衍射光脉冲的峰值强度随入射导波光脉冲宽度的增加逐渐接近连续导波光情形;当入射导波光脉冲宽度大于1.1ps时,可按多频静磁波对连续导波光的作用来处理。多频静磁波的频率间隔增大,衍射光脉冲之间的均衡性变差,对应的-3dB均衡带宽约为40MHz。本文结论可为基于磁光Bragg衍射的频谱分析器件设计提供理论指导。According to the magneto-optical perturbation theory,the magneto-optic Bragg diffraction process of guided optical wave （GOW） pulses induced by multi-frequency magnetostatic waves （MSWs） under the small signal case is analyzed and the corresponding coupled-mode equations are derived,which are also suitable for the cases of continuous GOWs and single-frequency MSWs. The calculation showed that,（1） with the increase of incident GOW pulse width,the peak intensity of diffracted light pulses is more and more close to the case of continuous GOWs,especially in case with the incident pulse width of greater than 1.1ps; （2） the power fluctuation of diffracted light pulses enlarge with MSW frequency interval and the -3dB equilibrium bandwidth （frequency interval） is 40MHz or so. The conclusions may provide theoretical guidance for the development of spectrum analyzers based on the magneto-optic Bragg diffraction.

关 键 词：磁光Bragg衍射 静磁波 频谱分析 

分 类 号：O482.55[理学—固体物理] TN247[理学—物理]