Research on optical interrogation system based on MG-Y tunable diode laser

被引：0
|
作者：
Liu J. [1 ]
Zhu L. [1 ,2 ,3 ]
He W. [2 ,3 ]
Song Y. [2 ,3 ]
Meng F. [2 ,3 ]
机构：
[1] School of Instrument Science and Opto-electronics Engineering, Hefei University of Technology, Hefei
[2] Beijing Laboratory of Optical Fiber Sensing and System, Beijing Information Science & Technology University, Beijing
[3] Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instrument, Beijing Information Science & Technology University, Beijing
来源：
Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument | 2020年 / 41卷 / 03期
关键词：
Fiber Bragg grating; Interrogation system; MG-Y tunable laser; Wavelength-swept laser;
D O I：
10.19650/j.cnki.cjsi.J2005991
中图分类号：
学科分类号：
摘要：
This study illustrates an efficient fiber grating sensor interrogation system based on wavelength-swept laser of the modulation grating Y (MG-Y) branch. The interrogation system consists of a tunable laser control system and a photodiode detection circuit. A monolithic integrated constant current source and a high-precision temperature controller are used to drive the tunable laser system, which is controlled by an advanced RISC machine (ARM) processor. In this way, it can achieve quasi-continuous and stable laser output. The photodetection circuit consists of a photodiode and a logarithmic amplification circuit with high dynamic range, which realizes the acquisition of FBG reflection wavelength. To study the interrogation hardware system of the laser, a method based on a wavelength meter for implementing a look-up table is proposed, and an accurate conversion model of "wavelength-current" is formulated to achieve the assembly and adjustment of the interrogator. The tunable laser source is tested by experiments. It can sequentially output 2 001 lasers at a spectral interval of 20 pm from 1 527 to 1 567 nm spectral range. The maximum deviation of the scanning wavelength interval is 8 pm, and the power fluctuation is less than 4.5 dBm. In the Fabry-Perot (F-P) etalon verification experiment, the interrogator can resolve 52 reflection peaks in the range of 40 nm. © 2020, Science Press. All right reserved.
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页码：87 / 96
页数：9
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