Shien-Kuei Liaw
National Taiwan University of Sci. and Tech, Taiwan
Title: Linear-cavity fiber lasers investigation and application
Biography
Biography: Shien-Kuei Liaw
Abstract
Recently, much more attention has been directed to diode-pumped single-longitudinal-mode (SLM) fiber lasers because of their high reliability, compactness, and capability of shot-noise-limited operation in the megahertz frequency range. In this paper, a SLM linear-cavity fiber laser at C-band wavelength is proposed and demonstrated by using only two subring cavities, either in serial or parallel connection. The employed saturable absorber filter and two subring cavities successfully suppress the multi-longitudinal-mode oscillation caused by spatial hole burning in a linear cavity. Tunable laser sources have seen various applications in recent years such as optical switching, network protection or digital communication. Among various tunable lasers, fiber lasers now compete directly in several domains with semiconductor lasers because they present the advantages of high brightness, low intensity noise, thermal stability, excellent coupling into a single mode fiber and better compatibility with fiber components. In this paper we develop an L band tunable erbium-doped fiber laser (TEDFL) using a broadband fiber mirror (BFM) and a tunable fiber Bragg grating (TFBG) as cavity ends. Several characteristics such as the gain fiber length, threshold pumping power, pumping efficiency and side-mode suppression ratio (SMSR) are studied. The wavelength tuning function is also demonstrated.