Multiplexed long-length fiber Bragg grating distributed sensors based on synthesis of optical coherence function

Koji Kajiwara; Kazuo Hotate

doi:10.1117/12.835249

5 October 2009 Multiplexed long-length fiber Bragg grating distributed sensors based on synthesis of optical coherence function

Koji Kajiwara, Kazuo Hotate

Author Affiliations +

Proceedings Volume 7503, 20th International Conference on Optical Fibre Sensors; 75032J (2009) https://doi.org/10.1117/12.835249
Event: 20th International Conference on Optical Fibre Sensors, 2009, Edinburgh, United Kingdom

Abstract

Recently, we have reported a scheme for measuring Bragg-wavelength distribution inside a long-length fiber Bragg grating using synthesis of optical coherence function, which is one of the reflectometry techniques based on interferometer and heterodyne detection with an optical frequency-shifter and an electronic band-pass filter. However, the system did not have enough measurement range since it measured the distribution with only one grating. For extending the range, long-length FBG sensors are multiplexed and distribution in each grating is measured. In the process of multiplexing FBGs, a scheme for compensating the beat frequency shift due to the high speed sweep of the optical center frequency of the light source is introduced in the system.

Citation Download Citation

Koji Kajiwara and Kazuo Hotate "Multiplexed long-length fiber Bragg grating distributed sensors based on synthesis of optical coherence function", Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 75032J (5 October 2009); https://doi.org/10.1117/12.835249

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