Novel Single Clad Ho-doped Fiber with High Slope Efficiency and Low Ion Pairing

TL;DR

This paper introduces a novel Ho-doped fiber with high efficiency and low ion pairing, achieving a record slope efficiency of 57% at 2050 nm, and presents a new non-destructive ion pairing measurement method.

Contribution

The paper reports the design and experimental validation of a high-performance single clad Ho-doped fiber with the highest slope efficiency to date and a new method for measuring ion pairing.

Findings

Achieved 57% slope efficiency at 2050 nm with 1 mW input.

Developed a non-destructive method to measure ion pairing coefficient.

Linked low ion pairing coefficient to high fiber amplifier efficiency.

Abstract

We report the design and experimental and simulated performance for a 2050 nm band fiber amplifier with high optical-optical slope efficiency and low ion pairing, using a novel high performance single clad Ho-doped fiber from the Naval Research Laboratory (NRL). We measure an optical-optical slope efficiency of 57% using 1 mW input signal power and 1860 nm pumping which we believe is the highest slope efficiency obtained to date for a single clad single stage copumped HDFA. A new method for non-destructive measurement of the ion pairing coefficient in Ho-doped fibers is introduced and validated. Using this method, we link our 57% slope efficiency to a low ion pairing coefficient of 4% in the NRL Ho-doped fiber as derived from our experimental data. We present an overview and survey of the ion pairing results for Ho-doped fiber amplifiers and lasers reported so far in the literature.