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窄线宽全光纤环形滤波器特性研究

Narrow Linewidth All-Fiber Ring Filters

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摘要

设计了两种用于单纵模光纤激光器的窄线宽全光纤环滤波器,其由超低反光纤光栅和1个(或2个)2×2光纤耦合器构成。从理论上推导出两种滤波器的反射率表达式,并且对其反射率、窄线宽和群时延特性进行了详细的数值分析和实验验证。研究结果表明:由超低反光纤光栅和光纤耦合器构成的单环滤波器具有高反射率、超窄线宽和大群时延特性,表现出良好的慢光效应。双环滤波器除了保持了以上良好特性,还因游标效应,共振幅度可调,相对单环滤波器,具有更大的有效自由光谱范围(FSR)、更大的边模抑制比(SMSR)以及不易跳模等特点。所研究的光纤环形滤波器具有窄线宽、结构紧凑和低成本等优点,可用作光纤激光器的反射腔镜来进一步压窄激光器线宽,尤其是当双环滤波器用作腔镜时,激光器的线宽更窄,模式更稳定。

Abstract

Two narrow-linewidth filters, consisting of an ultra-low-reflectivity fiber Bragg grating (LRFBG) and one (or two) 2×2 fiber couplers, are designed for single-longitudinal-mode fiber lasers. The reflectivity expressions of the two filters are deduced theoretically. The characteristics of the two filters, such as reflectivity, narrow linewidth and group delay, are numerically analyzed and experimentally verified. The two fiber filters have the characteristics of high reflectivity, ultra-narrow linewidth, large group delay and good slow-light effect. What’s more, in the case of the double-ring filter, the amplitudes of resonant peaks are modulated because of the Vernier effect. Therefore, the effective free spectral range (FSR) and side mode suppression ratio (SMSR) of the double-ring filter are larger than those of the single-ring filter, which means the double-ring filter is hardly mode hopping. Because of the advantages of narrow linewidth, compact structure and low cost, both of the designed filters can be used for fiber laser as the cavity mirror to narrow the linewidth of laser further. And the results show the linewidth of the laser with double-ring filter is narrower than that of the laser with single-ring filter.

Newport宣传-MKS新实验室计划
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中图分类号:O436

DOI:10.3788/aos201838.1006001

所属栏目:光纤光学与光通信

基金项目:国家自然科学基金(61535014,61775225,61475165)、“十三五”航天领域预研专用技术项目(30501020107HT02)、国家重点研发计划重点专项(2017YFB0405501)、中国科学院实验室创新基金(CXJJ-17S010)、上海市优秀技术带头人(15XD1524500)、上海市青年科技英才扬帆计划(18YF1426100)、上海市自然科学基金(18ZR1444300)

收稿日期:2018-04-04

修改稿日期:2018-05-02

网络出版日期:2018-05-08

作者单位    点击查看

秦晓琼:中国科学院上海光学精密机械研究所上海市全固态激光器与应用技术重点实验室, 上海 201800中国科学院大学, 北京 100049
方祖捷:中国科学院上海光学精密机械研究所上海市全固态激光器与应用技术重点实验室, 上海 201800
应康:中国科学院上海光学精密机械研究所上海市全固态激光器与应用技术重点实验室, 上海 201800
魏芳:中国科学院上海光学精密机械研究所上海市全固态激光器与应用技术重点实验室, 上海 201800
王照勇:中国科学院上海光学精密机械研究所上海市全固态激光器与应用技术重点实验室, 上海 201800
叶青:中国科学院上海光学精密机械研究所上海市全固态激光器与应用技术重点实验室, 上海 201800
潘政清:中国科学院上海光学精密机械研究所上海市全固态激光器与应用技术重点实验室, 上海 201800
蔡海文:中国科学院上海光学精密机械研究所上海市全固态激光器与应用技术重点实验室, 上海 201800
瞿荣辉:中国科学院上海光学精密机械研究所上海市全固态激光器与应用技术重点实验室, 上海 201800

联系人作者:蔡海文(hwcai@siom.ac.cn); 应康(yingk0917@siom.ac.cn);

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引用该论文

Qin Xiaoqiong,Fang Zujie,Ying Kang,Wei Fang,Wang Zhaoyong,Ye Qing,Pan Zhengqing,Cai Haiwen,Qu Ronghui. Narrow Linewidth All-Fiber Ring Filters[J]. Acta Optica Sinica, 2018, 38(10): 1006001

秦晓琼,方祖捷,应康,魏芳,王照勇,叶青,潘政清,蔡海文,瞿荣辉. 窄线宽全光纤环形滤波器特性研究[J]. 光学学报, 2018, 38(10): 1006001

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