Author(s): Lv, B (Lv, Bing); Zhang, WT (Zhang, Wentao); Huang, WZ (Huang, Wenzhu); Li, F (Li, Fang)

Source: OPTICAL FIBER TECHNOLOGY Volume: 70 Article Number: 102858 DOI: 10.1016/j.yofte.2022.102858 Published: MAY 2022

Abstract: A switchable dual-wavelength random fiber laser (DW-RFL) with compact structure and a low-threshold is demonstrated. A Fabry-Perot interferometer which consists of a pair of fiber Bragg gratings is used in the DW-RFL as a filter to select two lasing wavelengths. The random Bragg grating array (RBGA), instead of long-distance single mode fiber, is used to introduce random distributed feedback. The threshold is reduced and the stabil -ity is improved due to the RBGA with high random feedback efficiency and a section of high gain of the erbium-doped fiber. Wavelength selecting and switching can be realized by tuning the pump power. The principle of RBGA and FBG-based F-P interferometer in the DW-RFL is analyzed and simulated. The experimental results show that the lasing threshold is about 18 mW and the optical signal noise ratio is about 40 dB. The stable dual-wavelength oscillation with uniform amplitude is realized. The wavelength spacing of the two lasing lines is within 0.095 nm and the maximum peak-power fluctuation is less than 1 dB. The proposed switchable and stable DW-RFL can be employed in microwave or terahertz generation systems, optical sensing, coherent communi-cation and high resolution measurements.

Accession Number: WOS:000805494300008

ISSN: 1068-5200

eISSN: 1095-9912

Full Text: https://www.sciencedirect.com/science/article/pii/S1068520022000414?via%3Dihub