Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/6541
Title: Beat-frequency adjustable Er³⁺-doped DBR fiber laser for ultrasound detection
Authors: Guo, T
Wong, ACL
Liu, WS
Guan, BO
Lu, C 
Tam, HY 
Keywords: Birefringence
DBR lasers
Electroacoustic transducers
Erbium
Fading (radio)
Fibers
Frequency allocation
Issue Date: 31-Jan-2011
Publisher: Optical Society of America
Source: Optics express, 31 Jan. 2011, v. 19, no. 3, p. 2485-2492 How to cite?
Journal: Optics express 
Abstract: A compact low beat-frequency dual-polarization distributed Bragg reflector (DBR) fiber laser whose beat frequency can be varied, for high-frequency ultrasound detection has been proposed and experimentally demonstrated. The laser was fabricated in small birefringent commercial erbium-doped fiber. It operated in a robust single-longitude mode with output power of more than 1 mW and high signal-to-noise ratio better than 60 dB. Induced birefringence to the fiber during the UV inscription process is small (~10‾ ⁷) and consequently the laser beats at a low frequency of ~20 MHz which is at least one order of magnitude smaller than previously reported results, 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. The proposed DBR fiber laser is also temperature insensitive, making it a good candidate for hydrophone applications.
URI: http://hdl.handle.net/10397/6541
EISSN: 1094-4087
DOI: 10.1364/OE.19.002485
Rights: © 2011 Optical Society of America. This paper was published in Optics express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/abstract.cfm?URI=oe-19-3-2485. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
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