Addressing fiber Bragg grating sensors with wavelength-swept pulse fiber laser and analog electrical switch |
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| Authors: | Ruo Ming Li You Long Yu |
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| Institution: | a Network Technology Research Centre, School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 637553, Singaporeb School of Instrument Science and Opto-electronic Engineering Hefei University of Technology, Hefei, 230009, China |
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| Abstract: | A pulse train with a wavelength dependent time sequence is generated in a fiber laser configuration, which contains a cascaded wavelength-division-multiplexing (WDM) fiber Bragg grating (FBG) array and a tunable F-P filter. By distributing pulses to corresponding channels with a 1 × N analog electrical switch, a novel FBG sensors interrogation technique with advantages of high signal-to-noise ratio (SNR) and high interrogation speed is experimentally demonstrated. Then, a FBG sensing system based on this interrogation technique and the mature unbalanced scanning Michelson interferometer (USMI) demodulation technique is realized. The system has shown a sensitivity of 1.610°/με, for the 1555 nm FBG, which agrees well with the theoretical value of 1.674°/με. |
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| Keywords: | Optical fibers Fiber Bragg grating sensor Fiber lasers |
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