Sensors 2013, 13(7), 8403-8411; doi:10.3390/s130708403
Article

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

1 Department of Electrical Engineering and Smart Grid Research Center, Chonbuk National University, Jeonbuk 561-756, Korea 2 Samsung Techwin Opto-Electronics Corporation, 230 Tianhe Road, Tianhe District, Guangzhou 510620, China
* Author to whom correspondence should be addressed.
Received: 10 April 2013; in revised form: 20 June 2013 / Accepted: 28 June 2013 / Published: 2 July 2013
(This article belongs to the Special Issue Laser Sensing and Imaging)
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Abstract: 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.
Keywords: radio-frequency (RF) interrogation; fiber Bragg grating (FBG); chirped fiber Bragg grating (CFBG); Mach-Zehnder electro-optical modulator (MZ-EOM)

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MDPI and ACS Style

Choi, S.-J.; Mao, W.; Pan, J.-K. Novel RF Interrogation of a Fiber Bragg Grating Sensor Using Bidirectional Modulation of a Mach-Zehnder Electro-Optical Modulator. Sensors 2013, 13, 8403-8411.

AMA Style

Choi S-J, Mao W, Pan J-K. Novel RF Interrogation of a Fiber Bragg Grating Sensor Using Bidirectional Modulation of a Mach-Zehnder Electro-Optical Modulator. Sensors. 2013; 13(7):8403-8411.

Chicago/Turabian Style

Choi, Sang-Jin; Mao, Wankai; Pan, Jae-Kyung. 2013. "Novel RF Interrogation of a Fiber Bragg Grating Sensor Using Bidirectional Modulation of a Mach-Zehnder Electro-Optical Modulator." Sensors 13, no. 7: 8403-8411.

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