频谱仪快速测定窄线宽激光器线宽  

Linewidth rapid measurement of narrow fiber laser by spectrum analyzer

作　　者：安盼龙[1,2] 赵瑞娟[2] 郑永秋[3] 薛晨阳[1,3] 张成飞[1] 李小枫[1] 闫树斌[1,3] 刘俊[1,3] 

机构地区：[1]中北大学仪器科学与动态测试教育部重点实验室,山西太原030051 [2]中北大学理学院,山西太原030051 [3]中北大学电子测试技术重点实验室,山西太原030051

出　　处：《红外与激光工程》2015年第3期897-900,共4页Infrared and Laser Engineering

基　　金：国家自然科学基金(61275166;91123036;61178058);国家自然科学基金项目科学仪器基础研究(61127008);国家自然科学基金杰出青年基金(51225504);山西省高等学校中青年拔尖创新人才项目;中北大学杰出青年基金支持计划

摘　　要：针对传统光谱仪和F-P干涉仪分辨率不能满足窄线宽激光器线宽的测量要求,基于延时自外差法搭建测试平台。设置频谱分析仪分辨率参数抑制噪声实验,通过使用20 km延时光纤、80 MHz声光移频器和50：50光纤耦合器,通过光电探测器实现光电转换并利用频谱分析仪分析测试信号。对频谱分析仪分辨带宽RBW和视觉带宽VBW以及扫频范围（Scan Range）进行优化设置,在不降低测试灵敏度的情况下,将重叠信号分辨开,使其不会过多滤掉高频成分而失真并对线宽功率谱峰值进行洛伦兹曲线拟合。最后得到了1 550 nm波长可调谐光纤激光器（1 520~1 570 nm）的线宽值约为161 k Hz,为频谱仪的参数优化设置及窄线宽激光器线宽标定提供了相关参考。For the linewidth measurement of the narrow linewidth laser, the resolution of the traditional spectrometer and the F-P interferometer is obviously insufficient to meet the requirement of linewidth measurement. In the experiment, a test platform was built using a spectrum analyzer based on the delay self-heterodyne method. Opportune parameters of the spectrum analyzer was set to distinguish noise suppression, using 20 km delay optical fiber based on the result of the calculation, 80 MHz acousto-optic frequency shifter（AOM）and 50：50 fiber coupler, achieve the photoelectric conversion by the photodetector.Optimally set the visual bandwidth（RBW）, resolution bandwidth（VBW） and the scan range. Without reducing the testing sensitivity, the analyzer will distinguish overlapping signals and do not filter out too much high frequency to be distorted. Lorenz curve fitting was carried to the linewidth power spectrum peaks. Then it is achieved that the linewidth of the tunable wavelength fiber laser（1520-1570 nm） is about 161 k Hz. It provides a reference to optimize the spectrum analyzer parameter settings and calibrate the linewidth parameter of the narrow linewidth fiber laser.

关 键 词：频谱仪 线宽测量 窄线宽激光器 延时自外差法 分辨带宽 

分 类 号：TN256[电子电信—物理电子学]