A recirculating delayed self-heterodyne method using a Mach-Zehnder modulator for kHz-linewidth measurement

被引：6
|
作者：
Deng, Shuo [1 ]
Li, Min [1 ]
Gao, Hongyun [1 ]
Dai, Yawen [1 ]
机构：
[1] Wuhan Univ Technol, Dept Phys, Nanhu Campus,Phys Ble 510, Wuhan 430070, Peoples R China
来源：
OPTICAL FIBER TECHNOLOGY | 2016年 / 31卷
关键词：
Linewidth; Heterodyne; MZM; LASER; INTERFEROMETER; RESOLUTION; SPECTRUM;
D O I：
10.1016/j.yofte.2016.06.007
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
A laser linewidth measurement method which uses a Mach-Zehnder electro-optic modulator (MZM) is proposed in a loss-compensated recirculating delayed self-heterodyne interferometer (LC-RDSHI). Compared with the traditional acousto-optic modulator (AOM), the electro-optic modulator has the merits of broader bandwidth, lower insertion loss, higher extinction ratio and thus, a wider application. A theoretical analysis shows that the power spectrum curve of the novel measurement system is a Lorentzian line, which fits well with experiment. The linewidth is measured to be 137 +/- 7 kHz at a frequency shift of 4 GHz. Measurement of a distributed feedback Bragg (DFB) laser has manifested that the linewidth broadens from 98.5 kHz to 137.4 kHz as the operating temperature changes by 16 degrees C. This work will allow investigation of narrow linewidth semiconductor and fiber laser stability. (C) 2016 Elsevier Inc. All rights reserved.
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页码：156 / 160
页数：5
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