Multi-wavelength switchable erbium-doped fiber laser based on single mode- tapered multicore- single mode fiber interferometer

Abstract

In this work, we propose and validate a switchable multi-wavelength erbium-doped fiber laser based on a single mode- tapered multicore- single mode fiber interferometer, utilizing the nonlinear polarization rotation effect to achieve stable output of multi-wavelength lasers. The experimental results demonstrate that by adjusting the polarization controller in the laser structure, the proposed laser is capable of operating stably in single-, dual- and triple-wavelength states with optical signal-to-noise ratios exceeding 54 dB. Additionally, the maximum fluctuations in central wavelength and peak power are 0.05 nm and 1.62 dB, respectively, which demonstrate good stability. To the best of our knowledge, this is the first time that the tapered multicore fiber is utilized in the multi-wavelength fiber laser, which provides a novel way for obtaining high-quality fiber lasers.