Multi-wavelength High-order Mode Fiber Laser Based on Symmetrical Fiber Mode Selective Coupler
A multi-wavelength ring cavity high-order mode fiber laser based on a symmetrical fiber mode selective coupler(MSC)and single mode-few mode-single mode fiber filter was demonstrated and verified in this paper.The experimental result reveals that the proposed laser can operate stably in single-,dual-,triple-and quadruple-wave-length states with LP11 mode output,whose purities are 97.60%,97.54%,97.34%and 97.19%,respectively.The symmetrical fiber MSC is easy to be fabricated and stable,providing a new choice for the high-order mode fiber laser,which has potential applications in optical communications,optical sensing,etc.