红外与激光工程
紅外與激光工程
홍외여격광공정
INFRARED AND LASER ENGINEERING
2015年
8期
2517-2522
,共6页
光纤模式%群时延差异%光谱干涉%空间干涉
光纖模式%群時延差異%光譜榦涉%空間榦涉
광섬모식%군시연차이%광보간섭%공간간섭
fiber modes%group delay difference%spectral interference%spatial interference
基于空间和频谱分辨测量法研究了光纤中的激发模式。利用光纤中激发模式的群时延表达式,理论上推导了基模与高阶模以及高阶模之间的群时延差异导致的光谱干涉公式,进行了相应的模拟计算与分析。对标准通信单模光纤和大模场双包层光纤进行模式测量实验研究,利用单模光纤探针与光谱分析仪扫描探测光谱干涉信号,通过傅里叶变换得到频谱分布,分析得到光纤中激发模式的横向分布和相对功率成分。结果表明,采用空间和频谱分辨测量法可以得到光纤中激发模式的横向分布和相对功率水平,当高阶模相对基模的功率较小时,可以忽略高阶模间的干涉。
基于空間和頻譜分辨測量法研究瞭光纖中的激髮模式。利用光纖中激髮模式的群時延錶達式,理論上推導瞭基模與高階模以及高階模之間的群時延差異導緻的光譜榦涉公式,進行瞭相應的模擬計算與分析。對標準通信單模光纖和大模場雙包層光纖進行模式測量實驗研究,利用單模光纖探針與光譜分析儀掃描探測光譜榦涉信號,通過傅裏葉變換得到頻譜分佈,分析得到光纖中激髮模式的橫嚮分佈和相對功率成分。結果錶明,採用空間和頻譜分辨測量法可以得到光纖中激髮模式的橫嚮分佈和相對功率水平,噹高階模相對基模的功率較小時,可以忽略高階模間的榦涉。
기우공간화빈보분변측량법연구료광섬중적격발모식。이용광섬중격발모식적군시연표체식,이론상추도료기모여고계모이급고계모지간적군시연차이도치적광보간섭공식,진행료상응적모의계산여분석。대표준통신단모광섬화대모장쌍포층광섬진행모식측량실험연구,이용단모광섬탐침여광보분석의소묘탐측광보간섭신호,통과부리협변환득도빈보분포,분석득도광섬중격발모식적횡향분포화상대공솔성분。결과표명,채용공간화빈보분변측량법가이득도광섬중격발모식적횡향분포화상대공솔수평,당고계모상대기모적공솔교소시,가이홀략고계모간적간섭。
A method of measuring excited modes in a fiber based on spatially and spectrally resolved measurement was adopted. According to the expression of the group delay of the fiber modes, the derivation processing of the group delay difference of transverse modes leading to the spectral interference was given as well as the corresponding simulation and analysis. The measurements for a standard communication single-mode fiber and a double-clad large-mode-area fiber were carried out. By using the single-mode fiber and optical spectrum analyzer to measure the spectral interference signal, the spectral interference signal by the Fourier transform was analyzed, and the distributions and power fractions of transverse modes were offered. The results show that the method of measuring the fiber modes based on spatially and spectrally resolved measurement can determine distributions and relative power levels of transverse modes in the fiber. When the high-order modes are weak compared with the fundamental mode, the interference between two different high-order modes can be ignored.