Wavelength-Switchable Single-Longitudinal- Mode Thulium-Doped Fiber Laser With Sampled Fiber Bragg Grating

Abstract

A wavelength-switchable single-longitudinal-mode thulium-doped fiber laser using a sampled fiber Bragg grating is proposed in this study. The laser can be switched between three single-wavelength and three dual-wavelength modes of operation. For the single-wavelength mode of operation, the maximum power and wavelength fluctuations in 50 min were ±0.404 dB and ±0.01 nm, and the linewidths at three wavelengths were 0.39, 1.88, and 0.89 kHz, respectively. For the dual-wavelength mode of operation, the maximum power and wavelength fluctuations in 20 min were ±0.926 dB and ±0.03 nm, respectively. The proposed thulium-doped fiber laser will find useful application in optical communication and free-space optical detection and sensing.INDEX TERMS thulium-doped fiber laser, wavelength-switchable, narrow linewidth, sampled fiber Bragg grating.

Switchable single- and dual-wavelength thulium/holmium co-doped fiber laser with single-longitudinal mode output

“…The SC possessing the advantages of low cost and easy of fabrication is mainly made of some passive optical couplers (OCs) with different lengths. Recently, based on the compound-cavity, cladding pumped SLM fiber lasers operated in 2 µm band have been realized by our group [18,19]. Also, several methods have been proposed and utilized to produce a single longitudinal-mode laser, such as combining of FBGs and narrow bandpass filter [13,20,21] However, to the best of our knowledge, the compound-cavity based SLM fiber laser in 2 µm band using the core pumped gain medium was barely reported in literatures, which should be investigated as well.…”

Five-Wavelength-Switchable Single-Longitudinal-Mode Thulium-Doped Fiber Laser Based on a Passive Cascaded Triple-Ring Cavity Filter

“…For the sake of the high transmission loss of 2 µm light in standard single-mode fiber, the traditional delayed self-heterodyne linewidth measurement method with a long delay line is no longer the most suitable strategy for measuring linewidths in 2 µm band. Currently, the proposed SLM lasers at 2 µm are mainly based on the short-cavity structure [24], and there are few reports on long-cavity-structure based tunable or switchable SLM lasers at 2 µm [25], [26]; however, previously reported compound-cavity filters were not completely analyzed or quantitatively designed in detail. Furthermore, coupler-based compound-cavity filters are more affordable and easy-alternative than other filters for realizing SLM lasing in 2 µm band.…”