基于超模的双芯光纤长周期光栅理论分析  

Theoretical Analysis of Dual Core Fiber Long Period Grating Based on Supermode

作　　者：郑晶晶[1] 宁提纲[1] 简水生[1] 

机构地区：[1]北京交通大学光波技术研究所,北京100044

出　　处：《中国激光》2010年第5期1275-1279,共5页Chinese Journal of Lasers

基　　金：国家自然科学基金(60477017;60771008);北京市自然科学基金(4082024);北京交通大学校科技基金(2006XM003)资助课题

摘　　要：以耦合模理论导出的超模为基础,推导出适用于双芯光纤矩形折射率分布长周期光栅(LPG)计算的理论方法,给出了输出的一般解析表达式。针对两纤芯完全相同的双芯光纤上写入两同步均匀且完全相同光栅的特殊模型,给出了单芯输出可用于直接计算的一般解析表达式,这种模型中光栅的影响表现为各波长上的附加相位和谐振波长的偏移,可以用于双芯光纤谐振波长的调整和可控的相位变化。对于两光栅仅有折射率变化幅度差异的模型,给出了数值模拟结果,讨论了这一因素对输出的影响。Based on supermodes derived from coupled mode theory,we present the formula to analyze dual core fiber gratings with rectangle-shaped index change,and give its general solution.To the same core with same synchronous uniform grating model,we present a simple express of the solution for each core that can be straightly used in calculation.In this model,the effect of grating is shifting resonant wavelength and adding different additional phases for different wavelengths and it could be used for adjusting the output spectrum of the dual core fiber,and controlling on its additional phase.To the model that gratings are different in index change,we give a numerical simulating result,and discuss its impact on performance.

关 键 词：光栅 双芯光纤 超模 耦合模理论 

分 类 号：O436[机械工程—光学工程]