Mode-Locked Fiber Laser With Transverse-Mode Selection Based on a Two-Mode FBG

Authors:

8 July 2014

journal article
Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Photonics Technology Letters

Vol. 26 (17) , 1766-1769
DOI:10.1109/lpt.2014.2335892

Abstract

We demonstrate a passively mode-locked fiber laser that incorporates a two-mode fiber Bragg grating (FBG) for transverse-mode selection. By controlling the polarization state of light in the cavity, the laser can provide a continuous-wave output at the LP ₀₁ mode, the LP ₁₁ mode, or their mix, which correspond to different reflection wavelengths of the FBG. When the laser is mode-locked, it generates picosecond pulses at a fundamental repetition rate of 6.58 MHz for both the LP ₀₁ and LP ₁₁ modes with a signal-to-noise ratio higher than 56 dB. At a sufficiently high pump power, the laser can generate irregular multiple-pulse trains and harmonic mode-locked pulses. The laser could find applications in mode-division multiplexed systems.

Keywords

Funding Information

Research Grants Council, Hong Kong Special Administrative Region, Hong Kong (112113)
Hong Kong Ph.D. Fellowship

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