Demodulation Technology of Distributed Feedback Fiber Laser Sensor Based on 3&times;3 Coupler

MAO Xin; HUANG Jun-bin; GU Hong-can

doi:10.3788/fgxb20173803.0395

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Demodulation Technology of Distributed Feedback Fiber Laser Sensor Based on 3×3 Coupler

更新时间：2020-08-12

- Demodulation Technology of Distributed Feedback Fiber Laser Sensor Based on 3×3 Coupler
- Chinese Journal of Luminescence Vol. 38, Issue 3, Pages: 395-401(2017)
- 作者机构：
  
  海军工程大学兵器工程系, 湖北武汉 430000
- 作者简介：
- 基金信息：
  
  Supported by Key Breakthrough Projects of Key Areas of Guangdong and Hong Kong(2004A
- DOI：10.3788/fgxb20173803.0395
  CLC： TP212.14;TN253
- Received：06 September 2016，
  
  Revised：15 December 2016，
  
  Published：05 March 2017
- 稿件说明：
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毛欣, 黄俊斌, 顾宏灿. 采用3×3耦合器的分布反馈式光纤激光传感器解调技术[J]. 发光学报, 2017,38(3): 395-401

MAO Xin, HUANG Jun-bin, GU Hong-can. Demodulation Technology of Distributed Feedback Fiber Laser Sensor Based on 3×3 Coupler[J]. Chinese Journal of Luminescence, 2017,38(3): 395-401
毛欣, 黄俊斌, 顾宏灿. 采用3×3耦合器的分布反馈式光纤激光传感器解调技术[J]. 发光学报, 2017,38(3): 395-401 DOI： 10.3788/fgxb20173803.0395.

MAO Xin, HUANG Jun-bin, GU Hong-can. Demodulation Technology of Distributed Feedback Fiber Laser Sensor Based on 3×3 Coupler[J]. Chinese Journal of Luminescence, 2017,38(3): 395-401 DOI： 10.3788/fgxb20173803.0395.

摘要

为了实现分布反馈式光纤激光传感器（DFB FL）大动态范围、稳定解调，建立了基于33耦合器的迈克尔逊干涉仪解调系统。对该系统所采用的对称解调算法（NPS）和反正切解调算法进行了深入研究。首先，介绍了基于33耦合器解调算法的原理及耦合器不对称时的调校方法。接着，对干涉仪所需最小非平衡路径长度的选取与系统强度噪声、激光器频率噪声的关系进行了分析。最后，针对NPS算法与反正切算法最大可解调信号幅度进行了分析对比，并研究了微分器对对称解调方法解调范围的影响。实验结果表明：NPS算法动态范围高于反正切算法，微分器的幅频特性不理想会减小解调动态范围。在采样频率为125 kHz、信号频率为1 kHz、干涉仪非平衡路径为100 m时，NPS算法与反正切算法的动态范围分别达到96 dB和90 dB。用解调前调校的方法，基于33耦合的解调方法动态范围大，能够实现稳定解调，满足工程应用要求。

Abstract

The 33 coupler-based Michelson interference demodulation system was established to achieve a stable demodulation of distributed feedback optical fiber laser sensor (DFB FL) in a wide dynamic range. The symmetric demodulation algorithm (NPS) and arctangent demodulation algorithm used in this system were in-depth researched. Firstly

the theory of the 33 coupler-based demodulation algorithm and calibration method used in asymmetry coupler were presented. Secondly

the selection of minimum unbalanced interferometer path length

as well as the relation of system noise and frequency noise of laser were analyzed. Next

the amplitude of the maximum demodulated signal of NPS and the arctangent algorithm were compared. At last

the effect of differentiator on the dynamic range of NPS method was analyzed. The experiment results show that the dynamic range of NPS method is wider than that of arctangent algorithm

and a bad amplitude-frequency characteristic of differentiator will narrow the dynamic range of demodulation. The dynamic range of NPS algorithm and arctangent algorithm reaches to 96 dB and 91 dB respectively when the sampling frequency is 125 kHz

signal frequency is 1 kHz

and interferometer's unbalanced length is 100 m. By applying calibration before demodulation

the 33 coupler-based demodulation methods may produce a large dynamic range

which can achieve a stable demodulation and meet the requirements of engineering application.

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references

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Demodulation Method Based on The 3×3 Optical Fiber Coupler

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College of Science, Harbin Engineering University

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Demodulation Technology of Distributed Feedback Fiber Laser Sensor Based on 3×3 Coupler

DOI：10.3788/fgxb20173803.0395

摘要

Abstract

关键词

Keywords

references