Multiwavelength fiber lasers based on multimode fiber Bragg gratings using offset launch technique

Xinhuan Feng, Hwa Yaw Tam, Weng hong Chung, Ping Kong Alexander Wai

Research output: Journal article publicationJournal articleAcademic researchpeer-review

22 Citations (Scopus)


The reflective characteristics of a multimode fiber Bragg grating (MM-FBG) and the changes of reflective spectra with mode excitation conditions in the multi-mode fiber were investigated. Two multiwavelength fiber laser configurations using offset launch technique to MM-FBG with hybrid gain mediums are proposed and demonstrated. Different multiwavelength outputs were obtained by variation of the spatial launching position of the single-mode fiber against the MM-FBG to achieve different mode group excitation. The first laser employs one MM-FBG in the ring cavity, achieving seven output wavelengths with a wavelength spacing of 0.76 nm. The second laser comprises two MM-FBGs connected in parallel, yielded 10 output wavelengths.
Original languageEnglish
Pages (from-to)295-299
Number of pages5
JournalOptics Communications
Issue number2
Publication statusPublished - 15 Jul 2006


  • Fiber laser
  • Multi-mode fiber Bragg grating (MM-FBG)
  • Multiwavelength lasers
  • Offset launch technique

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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