Novel RF Interrogation of a Fiber Bragg Grating Sensor Using Bidirectional Modulation of a Mach-Zehnder Electro-Optical Modulator

Sensors

Sang-Jin Choi¹  Wankai Mao² 

[1] Department of Electrical Engineering and Smart Grid Research Center, Chonbuk National University, Jeonbuk 561-756, Korea; E-Mail:;Samsung Techwin Opto-Electronics Corporation, 230 Tianhe Road, Tianhe District, Guangzhou 510620, China; E-Mail:

关键词: radio-frequency (RF) interrogation;    fiber Bragg grating (FBG);    chirped fiber Bragg grating (CFBG);    Mach-Zehnder electro-optical modulator (MZ-EOM);   

DOI  :  10.3390/s130708403

来源: mdpi

【 摘 要 】

We propose and experimentally demonstrate the novel radio-frequency (RF) interrogation of a fiber Bragg grating (FBG) sensor using bidirectional modulation of a Mach-Zehnder electro-optical modulator (MZ-EOM). Based on the microwave photonic technique and active detection, the transfer function of the proposed system was obtained, and the time delay was calculated from the change in the free spectral range (FSR) at different wavelengths over the optimal measuring range. The results show that the time delay and the wavelength variation have a good linear relationship, with a gradient of 9.31 ps/nm. An actual measurement taken with a sensing FBG for temperature variation shows the relationship with a gradient of 0.93 ps/10 °C. The developed system could be used for FBG temperature or strain sensing and other multiplexed sensor applications.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.