Journal
OPTICS EXPRESS
Volume 19, Issue 3, Pages 2485-2492Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.19.002485
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Funding
- Hong Kong Polytechnic University of Hong Kong Special Administrative Region, China [G-YX0W]
- Hong Kong Government [PolyU 5281/08]
- National Natural Science Foundation of China [60736039]
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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 (similar to 10(-7)) and consequently the laser beats at a low frequency of similar to 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. (C) 2011 Optical Society of America
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