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

Wenguo Han,Ting Feng,Luna Zhang,Biao Guan,Ying Guo,Ting Li,Fengping Yan,Yuping Suo,Qi Qin,Hong Zhou

doi:10.1109/access.2021.3072403

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.

Highlights

Narrow-linewidth thulium-doped fiber lasers (TDFLs) have received a great deal of attention due to their attractive features, such as good coherence, eye-safe lasing capability, high modulation rate, and stable spectrum, which contribute to their excellent application potential in free space optical communication (FSOC), gas detection, and sensing [1]–[3]
In conclusion, we report a novel design of a wavelengthswitchable SLM TDFL using a SC and a sampled fiber Bragg grating (SFBG)
By adjusting the polarization controllers (PCs) to change the birefringence in the fiber, the laser can be switched between the three single-wavelength and three dual-wavelength modes of operation

Summary

Introduction

Narrow-linewidth thulium-doped fiber lasers (TDFLs) have received a great deal of attention due to their attractive features, such as good coherence, eye-safe lasing capability, high modulation rate, and stable spectrum, which contribute to their excellent application potential in free space optical communication (FSOC), gas detection, and sensing [1]–[3]. For the linewidth measurement at the 2 μm wavelength region, the delay line should be short since the 2 μm light has a large transmission loss in the standard single mode fiber (Corning, SMF-28e). W. Han et al.: Wavelength-Switchable Single-Longitudinal-Mode Thulium-Doped Fiber Laser fiber-based interferometer [21]–[23] and fiber Bragg grating (FBG) filters [7], [24].

Results

Conclusion