A NOVEL BRILLOUIN OPTICAL TIME-DOMAIN REFLECTOMETER DEMODULATING METHOD BASED ON A SLOW-LIGHT MACH-ZEHNDER INTERFEROMETER |
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| Authors: | Qi Wang Yong Zhao Bo Han Ya-nan Zhang Peng Wang Li Wang |
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| Affiliation: | 1. College of Information Science and Engineering , Northeastern University , Shenyang , China;2. State Key Laboratory of Synthetical Automation for Process Industries , Northeastern University , Shenyang , China;3. College of Information Science and Engineering , Northeastern University , Shenyang , China |
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| Abstract: | □ A novel demodulating method based on a Gaussian index profile fiber Bragg grating slow-light Mach-Zehnder interferometer to demodulate the frequency shift of a Brillouin optical time-domain reflectometer is proposed and demonstrated. The slow-light was generated with a Gaussian index profile fiber Bragg grating, and transmission spectra and group index spectra characteristics of the grating were obtained through theoretical analysis and numerical simulation. With the slow-light Mach-Zehnder interferometer used, the phase sensitivity and relative power sensitivity can reach up to 0.0132 rad/MHz and 0.0144/MHz, respectively. These results were improved to 133 times and 22.4 times, respectively, which were as large as values based on a double-pass Mach-Zehnder interferometer. |
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| Keywords: | Brillouin optical time-domain reflectometer demodulation mach-zehnder interferometer sensitivity slow-light |
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