Abstract
Several high-performance and tunable erbium-doped fiber lasers are reviewed. They are constructed by using fiber Bragg gratings (FBGs) or short-wavelength-pass filters (SWPFs) as wavelength tunable components inside the laser cavity. Broadband wavelength tuning range including C- and/or S-band was achieved, and tunable laser output with high slope efficiency, high side-mode suppression ratio was obtained. These fiber lasers can find vast applications in lightwave transmission, optical test instrument, fiber-optic gyros, spectroscopy, material processing, biophotonic imaging, and fiber sensor technologies.
Highlights
In recent years, fiber lasers have found a variety of applications in the testing of fiber components, fiber sensing and wavelength division multipling (WDM) systems, in which they are used to act as a backup source with ITU-T grids [1]
The first kind is the fiber Bragg gratings (FBGs)-based linear-cavity tunable fiber laser using an optical circulator (OC) [10], or a broadband fiber mirror (BFM) [11] as rear cavity end while the front cavity end is based on tunable FBGs (TFBGs) which could be tuned by applying strain
For the linear-cavity fiber lasers as mentioned, a simpler way to achieve single-longitudinal-mode (SLM) operation is to put a piece of erbium-doped fiber (EDF) as pump absorber between the WDM coupler and 1 × 2 optical switch (OSW) for the OC-based linear-cavity tunable fiber laser as shown in Figure 3; and between the 1480/1550 nm WDM and TFBG for the BFM-based linear-cavity tunable fiber laser as shown in Figure 5, individually
Summary
26 nm, signal-to-amplified-spontaneous-emission (ASE) ratio of around 40 dB, and the full width half maximum (FWHM) linewidth of about 0.5 nm. The single-longitude-mode (SLM) operation will be briefly discussed in Subsection 5.3. These two kinds of tunable in-line filterbased tunable fiber lasers as mentioned may broaden wavelength tuning range in either C- and/or S-band and will be addressed in detail. Both of them have graceful features of simple structure, compactness, ease in connection with fiber components, high-efficiency, and continuous-tuning, which make them promising for vast applications
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