Beat-frequency adjustable Er3+-doped DBR fiber laser for ultrasound detection

Tuan Guo, Allan C.L. Wong, Wei Sheng Liu, Bai Ou Guan, Chao Lu, Hwa Yaw Tam

Research output: Journal article publicationJournal articleAcademic researchpeer-review

41 Citations (Scopus)


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.
Original languageEnglish
Pages (from-to)2485-2492
Number of pages8
JournalOptics Express
Issue number3
Publication statusPublished - 31 Jan 2011

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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