Generation of Multiwavelength Brillouin Erbium Fiber Laser Utilizing Triple Ring Cavity System

Abstract

A study on the lasing characteristics of Brillouin erbium fiber laser (BEFL) in a triple ring cavity laser system is presented. A Brillouin fiber laser system consists of two gain media which are the nonlinear Brillouin gain generated from single mode fiber (SMF) and linear gain from erbium doped fiber (EDF) [1]. The triple ring cavity BEFL comprised of three EDF sets (5.0 m each) and three 500 m of SMF to produce an inter‐dependent uni‐directional multi wavelength Stokes signals. Two cavities generated 17 Stokes signals with 22 GHz equal signal spacing while one cavity produced 24 Stokes signal with 11 GHz equal signal spacing. The combination of even and odd number of signals from these cavities will produce 34 Brillouin Stokes with 11 GHz signal spacing. It was observed that the system also produced a number of anti‐Stokes with significant peak powers. The effect of optimisation the Brillouin pump power and the EDF pump power to the Stokes signals are also been studied. A stable operation of thirty four Brillouin Stokes plus seven anti‐Stokes was obtained at around 1558.49 nm BP wavelength.