1. Switchable Multi-Wavelength Thulium-Doped Fiber Laser Using a Cascaded or Two-Segment Sagnac Loop Filter
- Author
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Ting Li, Fengping Yan, Dan Cheng, Qi Qin, Ying Guo, Ting Feng, Zhuoya Bai, Xuemei Du, Yuping Suo, and Hong Zhou
- Subjects
Multi-wavelength thulium-doped fiber laser ,wavelength switchable ,cascaded Sagnac loop filter ,two-segment Sagnac loop filter ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 - Abstract
A switchable multi-wavelength thulium-doped fiber laser (TDFL) using either two-stage cascaded or two-segment Sagnac loop filters are proposed and analyzed. Both filters incorporate a 3-m and 1.7-m long polarization-maintaining fiber, which acts as a comb filter. By adjusting two polarization controllers, when the TDFL used a cascaded Sagnac loop filter, eight stable single-wavelength operations were obtained with easy switching among them. The wavelength range was 16.36 nm during the single-wavelength switchable operation, with the optical signal-to-noise ratio up to 55 dB. This TDFL can achieve at most quintuple-wavelength operation. When the TDFL used a two-segment Sagnac loop filter, we achieved single-wavelength and dual-wavelength switchable. This TDFL can achieve at most stable quadruple-wavelength operation. In dual-wavelength switchable operation, the maximum and minimum wavelength spacings were 21.78 nm and 1.50 nm. Due to its abundant range of wavelengths, the proposed TDFLs has great potential in wavelength-division multiplexing.
- Published
- 2022
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