机械写制π相移弯曲不灵敏光纤长周期光栅滤波器  

Optical filters based on π phase-shifted LPG written in a bend-insensitive fiber

作　　者：石胜辉 罗彬彬[1,2] 汤斌 陈立功[1,2] 赵明富 SHI Shenghui;LUO Binbin;TANG Bin;CHEN Ligong;ZHAO Mingfu(School of Electrical and Electronic Engineering, Chongqing University of Technology,Chongqing 400054,China;Chongqing Key Laboratory of Optical Fiber Sensor and Photodetector, Chongqing University of Technology,Chongqing 400054,China)

机构地区：[1]重庆理工大学电气与电子工程学院,重庆400054 [2]重庆理工大学光纤传感与光电检测重庆市重点实验室,重庆400054

出　　处：《太赫兹科学与电子信息学报》2018年第5期921-925,共5页Journal of Terahertz Science and Electronic Information Technology

基　　金：国家自然科学基金资助项目(51276209;61505017);重庆市科委基础与前沿研究资助项目(cstc2014jcyjA0081);重庆市教育委员会科学技术研究计划青年项目资助项目(KJQN201801121)

摘　　要：采用2个交错放置的具有π相移的周期性刻槽板对弯曲不敏感光纤径向施力,形成了机械写制π相移长周期光栅(LPGs)滤波器。实验研究了压力和子光栅个数对π相移光纤光栅的光谱影响以及光栅的偏振相关损耗(PDL)。结果表明:两侧阻带的传输损耗由施加在光纤上面的压力决定,子光栅的个数决定π相移光纤光栅的通带宽度,但不影响通带中心波长;对LP13耦合模,当π相移个数从1增加到9时,滤波器通带带宽由8.2 nm增加到53.8 nm。LP13包层模具有最大PDL,其值约为6.86dB。该方法制作的π相移长周期光纤光栅(LPFG)具有可重构性,结构简单,易于操作,在光纤通信和传感领域具有潜在的应用价值。The optical filter based on mechanically-inducedπ-phase-shifted Long-Period Gratings(LPGs)formed by pressing a bend-insensitive fiber from two sides with two identical periodically grooved plates are investigated.The influence of the sub-grating number and pressure on the spectrum characteristics of theπ-phase-shifted LPG are investigated experimentally,together with the Polarization Dependent Loss(PDL).The results show that the depth of the two lateral rejection bands varies with the strength of pressure applied to the fiber;the pass-band width of the grating depends strongly on the number of the sub-grating,while the central wavelength of the pass-band is independent of it.For LP13 mode coupling,the pass band width varies from 8.2 nm to 53.8 nm when N increases from 2 to 9.A maximum PDL of about 6.86 dB for LP13 cladding mode is measured.It is believed that the mechanically-inducedπ-phase-shifted Long Period Fiber Gratings(LPFGs)with the merits of reconstructable,simple and easy operation have potential applications in fields of fiber-optic communications and fiber-optic sensing.

关 键 词：光纤光学 带通滤波器 π相移长周期光纤光栅 周期性压力 

分 类 号：TN253[电子电信—物理电子学]