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WEI HE1, LIANQING ZHU1,* , MINGLI DONG1, FEI LUO1
A stable and tunable dual-wavelength thulium-doped fiber laser based on a dual-pass Mach-Zehnder interferometer (MZI) filter is proposed and experimentally demonstrated. The designed MZI is composed of two 3-dB couplers and one broadband reflection mirror used as a wavelength reflector, and the filter is connected to a ring cavity by one circulator. A 0.8-m-long gain medium fiber is used in the experimental demonstration, and the working threshold is 182 mW. By adjusting the polarization controller (PC), tunable single-wavelength lasing lines with 3-nm intervals can be obtained within the 1851-1866-nm range, while the wavelength tuning interval and peak power shifts are less than 3.3 nm and 2.3 dB, respectively. When lasing is realized at 1863.5 nm, the wavelength and power variations are less than 1.3 nm and 0.45 dB, respectively, for a 30-min scanning period at room temperature, and the side-mode suppression ratio (SMSR) is larger than 37.5 dB. By changing the polarization condition, tunable dual-wavelength lasing can be achieved. Dual-wavelength lasing lines are realized at 1864 and 1875 nm and the stability is monitored; the respective power fluctuations are less than 1.6 and 1.8 dB for the 1864- and 1875-nm lines, respectively, the wavelength shifts are less than 0.98 and 1.73 nm, respectively, and the SMSR is larger than 31.2 dB. In the experiment, triple-wavelength lasing is also obtained by adjusting the polarization controller..
Dual-wavelength, Thulium-doped fiber laser, Mach-Zehnder interferometer, Ring cavity.
WEI HE, LIANQING ZHU, MINGLI DONG, FEI LUO, Switchable dual-wavelength thulium-doped fiber laser based on all fiber Mach-Zehnder interferometer, Optoelectronics and Advanced Materials - Rapid Communications, 11, 1-2, January-February 2017, pp.7-11 (2017).
Submitted at: April 27, 2016
Accepted at: Feb. 10, 2017
Optoelectronics and Advanced Materials - Rapid Communications
(2023): 0.5 - 2023 Journal Citation Reports (Clarivate Analytics, 2024)
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