Journal
INFRARED PHYSICS & TECHNOLOGY
Volume 122, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.infrared.2022.104046
Keywords
Superimposed polarization-maintaining fiber; Bragg grating; Multi-wavelength thulium-doped fiber laser; Polarization hole burning
Categories
Funding
- National Natural Science Foundation of China [61827818, 61620106014, 61975049, 61975015]
- Hebei Provincial Natural Science Foun-dation for Outstanding Young Scholars [F2020201001]
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This paper proposes and experimentally demonstrates a switchable multi-wavelength thulium-doped fiber laser with a high optical signal-to-noise ratio and stability. By utilizing a superimposed polarization-maintaining fiber Bragg grating as a narrow bandwidth filter and introducing polarization hole burning technology, the laser is able to select and achieve stable output of different wavelengths in the 2-mu m band.
A switchable multi-wavelength thulium-doped fiber laser with a high optical signal-to-noise ratio (OSNR) and stability is proposed and experimentally demonstrated at 2.05 mu m. For the first time, a superimposed polarization-maintaining fiber Bragg grating (SI-PM-FBG) was utilized as a multi-channel narrow bandwidth filter to select the lasing wavelengths in the laser cavity in the 2-mu m band. It also introduced polarization hole burning (PHB) to inhibit the strong wavelength competition induced by homogeneous gain broadening in the thulium-doped fiber. By adjusting the two polarization controllers (PCs), four stable switchable single wavelength operations were obtained. The OSNR reached 72 dB at a pump power of 2.89 W, and the maximum wavelength and power fluctuations were 0.01 nm and 0.162 dB, respectively. Four combinations of dual-wavelength operations were obtained by adjusting the PCs. The polarization states between each dual wavelength lasing were orthogonal. The stability of the dual-wavelength operation was investigated in detail. The proposed laser also has the capability for three-or four-wavelength operation. The excellent performance enables this fiber laser to be used in atmospheric sensing and free-space optical communication.
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