Abstract

In this paper, a highly stable Erbium-doped fiber (EDF) laser-based sensor is devised and demonstrated by applying a polarization-maintaining (PM) ring cavity configuration with PM-EDF amplifier (EDFA) to our previously proposed EDF-sigma laser (EDFσL)-based sensor. In this EDFσL configuration, a polarization-independent double-pass cascaded-chirped long-period fiber grating (C-CLPG) consists of a C-CLPG and a Faraday rotator mirror (FRM), and works as a reflective sensor section with a comb-like spectrum and allows for flexible sensor configurations. In addition, it has a function to compensate for birefringence fluctuations during sensing operations by introducing the FRM. In the experiment, the highly stable operation of oscillation output is successfully improved by comparing the PM-EDFσL with a previously proposed EDFσL, and a much more precise operation of the laser-based sensor is expected.

© 2023 The Author(s)