Switchable Wide-Band Multi-Wavelength Brillouin-Erbium Fiber Laser Based on Random Distributed Feedback

Fei Wang,Yifan Gong

doi:10.1109/access.2020.3042187

Abstract

A wavelength-interval switchable wide-band multi-wavelength Brillouin-erbium fiber laser with a half-open cavity is proposed and experimentally demonstrated, which is constructed by random distributed feedback (RDFB) mirrors provided by Rayleigh backscattering in a 1-km-long highly nonlinear fiber (HNLF) and a fiber loop mirror (FLM) incorporated a high-power erbium-doped fiber amplifier (HP-EDFA). A strong RDFB and high stimulated Brillouin scattering (SBS) gain are provided by the HNLF. The HP-EDFA is incorporated into the FLM to boost power of the Brillouin pump and feedback Stokes, enhanced SBS and multiple four-wave mixing are stimulated in the HNLF. Using the presented scheme, up to 118 stable Stokes laser lines with a power deviation of less than 15 dB, 70 stable Stokes laser lines with a power deviation of less than 5 dB and a fix wavelength spacing of 0.075 nm are obtained. Peak power fluctuations of arbitrarily chosen 27 Brillouin comb lines are less than 1.95 dB during a 60-minute measurement period, indicates that the proposed laser has a good stability. The effect of pump power of the HP-EDFA on Stokes generating in the laser is also investigated. Furthermore, when a polarization-maintaining fiber loop mirror is cascaded with the free end of the HNLF via an optical isolator, wavelength-interval switchable laser can be conveniently achieved.

Highlights

Random fiber lasers (RFLs) are characterized by a nonresonant positive feedback, which are proved be an important new light source for applications in nonlinear optics, sensing and telecommunications [1]
In the previous work [20], we presented a tunable and switchable multiwavelength Brillouin–Erbium random fiber laser (MWBERFL) with a half-open cavity, the generated very limited oscillating comb lines may be inadequate in practical application
When pump power of the high-power erbiumdoped fiber amplifier (HP-EDFA) is 2.51 W, free running spectrum consisting of two spectral peaks respectively located at 1535.717 and 1542.476 nm is obtained

Summary

Introduction

Random fiber lasers (RFLs) are characterized by a nonresonant positive feedback, which are proved be an important new light source for applications in nonlinear optics, sensing and telecommunications [1].

Results

Conclusion