研究目的
Investigating the generation of dissipative-soliton-resonance (DSR) pulses in an all-anomalous-dispersion regime thulium-doped fiber laser and the effect of polarization controllers and NALM length on the characteristics of the DSR pulses.
研究成果
The study successfully generated two different DSR pulses in an all-anomalous-dispersion regime thulium-doped fiber laser by adjusting the polarization controllers. The DSR pulses exhibited high energy and stability, with a maximum pulse energy of 63 nJ obtained. The lengthening of passive fibers decreased the mode-locking threshold and increased the pulse energy but did not significantly improve the peak power.
研究不足
The peak power of the DSR pulses is difficult to increase with pump power or passive fiber length. The output power and peak power of DSR pulses are not significantly improved by lengthening passive fibers.
1：Experimental Design and Method Selection:
A figure-of-eight thulium-doped fiber laser was designed to generate DSR pulses in an all-anomalous-dispersion regime. The nonlinear amplifying loop mirror (NALM) was introduced for mode locking.
2：Sample Selection and Data Sources:
The gain medium was a 4.5-m Tm-doped fiber with a diameter core of 10 μm and doped with 4 wt.% of Tm3+. The pump light was injected into the NALM through a 1570/1950 nm WDM.
3：5-m Tm-doped fiber with a diameter core of 10 μm and doped with 4 wt.% of Tm3+. The pump light was injected into the NALM through a 1570/1950 nm WDM.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The setup included a wavelength division multiplexer (WDM), Tm-doped fiber (TDF), single mode fiber, polarization controller (PC), coupler, isolator (ISO), and a 20% fiber output coupler (OC).
4：Experimental Procedures and Operational Workflow:
The laser was pumped by a 1570-nm laser, and the polarization controllers were adjusted to obtain two different mode-locked pulses. The output was analyzed using a high-speed photodiode and a high-speed oscilloscope.
5：Data Analysis Methods:
The temporal profiles, spectra, pulse trains, and RF spectra of the pulses were recorded and analyzed to determine their characteristics.
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