Coherence enhancing technique in fiber laser and its application to sensor

Kyoo Nam Choi

doi:10.1117/12.784372

9 January 2008 Coherence enhancing technique in fiber laser and its application to sensor

Kyoo Nam Choi

Proceedings Volume 6794, ICMIT 2007: Mechatronics, MEMS, and Smart Materials; 67940Z (2008) https://doi.org/10.1117/12.784372
Event: ICMIT 2007: Mechatronics, MEMS, and Smart Materials, 2007, Gifu, Japan

Abstract

Sensitivity of fiber optic sensor is critical concern, in case of concealed application such as buried fiber-optic sensor, because ground soil behaves as buffer to isolate from outside disturbance by intruder. Thus coherent intrusion sensor is getting popularity where the sensitivity is primary concern, since the superior sensitivity comes from optical phase relationship of two received light signal. The performance of coherent sensor depends on the coherent degree of light source. Conventional laser light source is not sufficient for this application, thus enhancing technique to increase coherence length is required to have stable sensor response. Fiber laser is the suitable candidate because emission spectra can be adjusted to the wavelength where transmission loss through glass fiber medium is at its minimum. The performance of erbium doped fiber laser with single optical feedback loops are compared with the one using selfinjection locked DFB laser experimentally in Mach-Zehnder interferometer configuration. The response of coherent fiber-optic sensor, in Mach-Zehnder interferometer configuration, using erbium doped fiber laser with single optical feedback loops as a light source is attempted to the various stimulus, including pressure, open flame and vehicle passing, for the purpose of evaluating sensor application. The possible application of this fiber laser with enhanced coherence is in zone perimeter security within ~20km where buried fiber-optic sensor installation is necessary.

Citation Download Citation

Kyoo Nam Choi "Coherence enhancing technique in fiber laser and its application to sensor", Proc. SPIE 6794, ICMIT 2007: Mechatronics, MEMS, and Smart Materials, 67940Z (9 January 2008); https://doi.org/10.1117/12.784372

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KEYWORDS

Fiber lasers

Sensors

Fiber optics sensors

Light sources

Feedback loops

Fiber Bragg gratings

Fabry–Perot interferometers

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