研究目的
Investigating the development of a widely tunable single longitudinal mode erbium-doped fiber laser based on a microfiber knot resonator for applications in sensing, optical instrument testing, and optical communications.
研究成果
The study successfully demonstrates a widely tunable SLM erbium-doped fiber laser based on a MKR, capable of tuning from 1545 to 1565 nm with a high side-mode suppression ratio of 55 dB. This simple and novel all-fiber laser source has potential applications in sensing, optical instrument testing, and optical communications.
研究不足
The laser's tunable range is limited to 1545 ~ 1565 nm, beyond which it cannot achieve SLM output. The system's complexity and the need for precise control of the MKR's fabrication and positioning may also pose challenges.
1：Experimental Design and Method Selection:
The study employs a microfiber knot resonator (MKR) as the longitudinal mode selecting component within a fiber laser setup to achieve single longitudinal mode (SLM) operation. The MKR is fabricated using a flame brushing technique to taper standard SMF to about 5 μm, then manually tied into a knot.
2：Sample Selection and Data Sources:
The setup includes a 974 nm pump laser diode, a 980/1550 nm wavelength division multiplexer, erbium-doped fiber (EDF1, Nufern) with a length of 5 m, an isolator, a polarization controller, an optical tunable filter (OTF, santec-320), an un-pumped EDF2 length of
3：3 m, and a
10 fiber coupler.
4：List of Experimental Equipment and Materials:
Equipment includes a Yokogawa AQ6370C optical spectrum analyzer and a Rohde & Schwarz FSV30 frequency spectrum analyzer.
5：Experimental Procedures and Operational Workflow:
The MKR is incorporated into the cavity to select longitudinal modes, with an un-pumped EDF2 used to suppress mode competition. The laser's spectral and frequency properties are monitored.
6：Data Analysis Methods:
The laser's performance is evaluated based on its tuning range, side-mode suppression ratio, and stability.
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