Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/16705
Title: Ultrasound detection using a tunable low beat-frequency Er 3+-doped DBR fiber laser
Authors: Guo, T
Wong, ACL
Liu, W
Guan, B
Lu, C 
Tam, HY 
Keywords: Birefringence
Fiber optic sensor
Photonic crystal fiber
Salinity measurement
Issue Date: 2011
Publisher: SPIE-International Society for Optical Engineering
Source: Proceedings of SPIE : the International Society for Optical Engineering, 2011, v. 7753, 775336 How to cite?
Journal: Proceedings of SPIE : the International Society for Optical Engineering 
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.
Description: 21st International Conference on Optical Fiber Sensors, Ottawa, ON, 15-19 May 2011
URI: http://hdl.handle.net/10397/16705
ISBN: 9780819482464
ISSN: 0277-786X
EISSN: 1996-756X
DOI: 10.1117/12.884973
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