Wavelength switchable multiwavelength actively mode-locked fiber-ring laser based on highly nonlinear photonic crystal fiber and multimode fiber Bragg grating

Xiaohui Fang, Ping Kong Alexander Wai, Chao Lu, Xinhuan Feng

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1 Citation (Scopus)

Abstract

A wavelength switchable multiwavelength actively mode-locked fiber-ring laser based on highly nonlinear photonic crystal fiber (PCF) and polarization-dependent mode coupling to multimode-fiber Bragg grating (MMFBG) is proposed. Twenty meters of highly nonlinear dispersion-shifted PCF (DS-PCF) is inserted into the fiber ring cavity to suppress gain competition through the four-wave-mixing (FWM) effect. A mode scrambler is attached to the multimode fiber (MMF) to introduce a polarization-dependent mode coupling to the MMFBG. Through changing polarization in the cavity, stable and switchable one-wavelength, two-wavelength (wavelength spacing of 0.8 and 2.4nm), and three-wavelength simultaneously actively mode-locked optical pulse trains at a repetition rate of 5GHz are obtained. We show that high nonlinearity introduced by the nonlinear PCF in the cavity can improve significantly supermode suppression ratio (SMSR) of the multiwavelength pulses generated and a sidemode suppression ratio (SMSR) of 58dB is realized.
Original languageEnglish
Article number124202
JournalOptical Engineering
Volume47
Issue number12
DOIs
Publication statusPublished - 1 Dec 2008

Keywords

  • actively mode-locked fiber laser
  • four wave mixing
  • highly nonlinear photonic crystal fiber
  • multimode fiber Bragg grating
  • wavelength switchable multiwavelength pulses

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering(all)

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