Increasing Modal Instabilities Threshold Through Bidirectional Pumping In High Power Fiber Amplifiers

TL;DR

This paper demonstrates that bidirectional pumping significantly increases the modal instability threshold in high power fiber amplifiers by creating a more homogeneous pump profile, thus enhancing stability.

Contribution

It introduces a novel pump configuration approach, showing a 30% increase in MI threshold through simulation, compared to traditional co-pumping methods.

Findings

Bidirectional pumping raises MI threshold by 30%.

Homogeneous pump profile reduces temperature-induced refractive index grating.

Technique offers a promising method for high power fiber amplifier stability.

Abstract

In this letter, the impact of pump configuration on the modal instabilities (MI) threshold of high power fiber amplifiers is investigated. Using a time dependent computer model based on the optical beam propagation method (BPM), the effect of bidirectional pumping on the MI threshold of high power fiber amplifiers is explored and compared to that of a co-pumped configuration. Simulation results indicate that the bidirectional pumping increases the instabilities threshold by a factor of 30% with respect to the co-pumped scheme. We attribute this threshold enhancement to a weaker strength of the temperature induced refractive index grating due to a more homogeneous pump profile along the fiber length. This technique demonstrates that the engineering pump scheme is a promising approach leading to an appreciable threshold enhancement of fiber amplifiers designed for high power applications.