期刊
OPTICS AND LASER TECHNOLOGY
卷 153, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.optlastec.2022.108231
关键词
Multimodal interference; Thulium doped fiber; Multi-wavelength emission; Coreless optical fiber
资金
- CONACyT ? [217560]
This study reports switchable multi-wavelength laser emission from a thulium-doped all-fiber laser by implementing tapered and non-tapered multi-modal interference (MMI) filters. The tapered MMI structure achieves lower insertion loss and more wavelength emission options in the 2μm region.
Switchable multi-wavelength laser emission from a thulium-doped all-fiber laser is reported by implementing a tapered and a non-tapered multi-modal interference (MMI) filters. The MMI structure relies on a coreless optical fiber spliced in between two single-mode optical fibers. For the non-tapered case, a minimum insertion loss of 12.60 dB is achieved around the 2-mu m region, from which stable generation of commutable dual-wavelength emission at 1986.34 nm and 2017.38 nm is obtained. On the other hand, the tapered MMI structure performs a minimum insertion loss of 8.74 dB at the 2-mu m region, allowing a stable triple-wavelength emission at 1995.4 nm, 2013.3 nm, and 2038.3 nm. In addition, commutable dual-wavelength emission was also obtained at 1997.9 nm and 2032.1 nm. The generated laser lines perform bandwidths of around 50 pm, low peak spectral power fluctuations and signal-to-noise ratio of 50 dB.
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