Watt-level ultrahigh-OSNR single-longitudinal-mode tunable Brillouin fiber laser

TL;DR

This paper demonstrates a watt-level, ultrahigh-OSNR, single-longitudinal-mode tunable Brillouin fiber laser with high power, stability, and tunability, achieved through cavity optimization and single-pass design.

Contribution

It introduces a novel single-pass cavity Brillouin fiber laser that achieves watt-level power and tunability without cavity mode restrictions, enhancing stability and noise performance.

Findings

Achieved 1.04 W output power at 2.24 W pump power.

Maintained stable single-longitudinal-mode operation.

Demonstrated tunability without cavity mode constraints.

Abstract

A watt-level ultrahigh optical signal-to-noise ratio (OSNR) single-longitudinal-mode (SLM) tunable Brillouin fiber laser (BFL) has been demonstrated.By optimizing the length of the single mode fiber (SMF) cavity at 11m and its output ratio at sixty percent, 1.04 W output power, as well as stable SLM operation is obtained at 2.24 W pump power. The single pass cavity BFL has the advantage that Brillouin pump frequency doesn't need to match the cavity mode, thus the stability is greatly improved. As only SMF is used in the cavity, the operate wavelength can be tunable without the restriction from self lasing cavity mode. Furthermore, it proves that core-pumped single frequency fiber laser is able to generate watt-level power. The laser has excellent performance in terms of noise, linewidth, and stability.