A Tunable Acousto-Optic Fiber Filter Based on Two Simultaneous Mode Coupling Processes  

作　　者：苗韧 张巍 冯雪 赵建辉 刘小明 

机构地区：[1]Department of Electronic Engineering, Tsinghua University, Beijing 100084

出　　处：《Chinese Physics Letters》2009年第7期143-146,共4页中国物理快报（英文版）

摘　　要：A dynamically tunable fiber filter realizing complex spectra of phase-shifted long period fiber gratings （LPFGs） is proposed and demonstrated experimentally. The principle of the filter is based on two acousto-optic coupling processes occurring simultaneously. The first coupling process acts as a normal LPFG, while the second makes the coupling direction of the first process change continuously, leading to a similar transmission spectrum with the phase-shifted LPFGs, in which the changing of coupling direction is realized by the discrete phase shifts of the index modulation. By adjusting the acoustic tuned to realize the phase-shifted LPFGs＇ spectra drive signals, its transmission spectrum can be dynamically under different phase shift numbers and locations.A dynamically tunable fiber filter realizing complex spectra of phase-shifted long period fiber gratings （LPFGs） is proposed and demonstrated experimentally. The principle of the filter is based on two acousto-optic coupling processes occurring simultaneously. The first coupling process acts as a normal LPFG, while the second makes the coupling direction of the first process change continuously, leading to a similar transmission spectrum with the phase-shifted LPFGs, in which the changing of coupling direction is realized by the discrete phase shifts of the index modulation. By adjusting the acoustic tuned to realize the phase-shifted LPFGs＇ spectra drive signals, its transmission spectrum can be dynamically under different phase shift numbers and locations.

关 键 词：OPTICS quantum optics and lasers 

分 类 号：TN248.1[电子电信—物理电子学] P642.23[天文地球—工程地质学]