Multiplexed fiber-ring laser sensors for ultrasonic detection

Tongqing Liu, Lingling Hu, Ming Han

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


We propose and demonstrate a multiplexing method for ultrasonic sensors based on fiber Bragg gratings (FBGs) that are included inside the laser cavity of a fiber-ring laser. The multiplexing is achieved using add-drop filters to route the light signals, according to their wavelengths, into different optical paths, each of which contains a separate span of erbium-doped fiber (EDF) as the gain medium. Because a specific span of EDF only addresses a single wavelength channel, mode completion is avoided and the FBG ultrasonic sensors can be simultaneously demodulated. The proposed method is experimentally demonstrated using a two-channel system with two sensing FBGs in a single span of fiber.

Original languageEnglish (US)
Pages (from-to)30474-30480
Number of pages7
JournalOptics Express
Issue number25
StatePublished - Dec 16 2013

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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