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Proceedings Paper

Ultrasound detection using a tunable low beat-frequency Er3+-doped DBR fiber laser
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Paper Abstract

A compact low-beat-frequency dual-polarization distributed Bragg reflector (DBR) fiber laser for high-frequency ultrasound detection has been demonstrated. The laser was fabricated in high germanium concentration, small-core erbium-doped fiber with very small birefringence. Induced birefringence to the fiber during the UV inscription process is small (~10-7) because of the small fiber core (4.2-μm) and consequently the laser beats at a low frequency of ~20 MHz, making frequency down-conversion unnecessary. The beat frequency can be adjusted by controlling the side-exposure time of the UV light irradiating the gain cavity, providing a simple approach to multiplex a large number of DBR fiber lasers of different frequencies in series using frequency division multiplexing (FDM) technique.

Paper Details

Date Published: 17 May 2011
PDF: 4 pages
Proc. SPIE 7753, 21st International Conference on Optical Fiber Sensors, 775336 (17 May 2011); doi: 10.1117/12.884973
Show Author Affiliations
Tuan Guo, Jinan Univ. (China)
The Hong Kong Polytechnic Univ. (China)
Allan Chi-lun Wong, The Hong Kong Polytechnic Univ. (Hong Kong, China)
Weisheng Liu, The Hong Kong Polytechnic Univ. (Hong Kong, China)
Baiou Guan, Jinan Univ. (China)
Chao Lu, The Hong Kong Polytechnic Univ. (Hong Kong, China)
Hwa-Yaw Tam, The Hong Kong Polytechnic Univ. (Hong Kong, China)


Published in SPIE Proceedings Vol. 7753:
21st International Conference on Optical Fiber Sensors
Jacques Albert; Wojtek J. Bock, Editor(s)

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