研究目的
Investigating the performance of a two stage single clad Thulium-doped fiber amplifier (TDFA) delivering an output power of 5 W at 1952 nm without stimulated Brillouin scattering for a single-frequency input signal.
研究成果
A simple and robust two stage single clad amplifier delivering more than 5 W of output power at 1952 nm signal wavelength was demonstrated. The design was guided by an experimental and theoretical study of single stage amplifier performance dependence on the active fiber length. The performance of the two stage amplifier with two topologies was compared, showing an input signal dynamic range greater than 30 dB with a slope efficiency in the booster stage of about 60%.
研究不足
The simulated slope efficiency shows some difference with the measured values, which could be caused by loss mechanisms not included in the simulation. The difference between experimental and simulated slope efficiency is under investigation.
1：Experimental Design and Method Selection:
The study involved optimizing the active fiber length of a single stage followed by the SC booster stage design. Both co- and counter-pumped single stage amplifiers were experimentally and theoretically investigated using two different commercial single clad Thulium-doped fibers (TDFs).
2：Sample Selection and Data Sources:
The study used OFS TmDF200 and iXBlue IXF-TDF-4-125 fibers.
3：List of Experimental Equipment and Materials:
The setup included a single-frequency narrow linewidth discrete mode laser (DML), optical isolator, multi-watt ~1560 nm in-band fiber laser, and Thulium-doped fibers.
4：Experimental Procedures and Operational Workflow:
The performance of the amplifiers was evaluated in terms of slope efficiency, gain, and noise figure for both saturated and unsaturated conditions.
5：Data Analysis Methods:
The simulation tool relied on a three level model of the Thulium ion, including absorption, gain, and non-radiative decay, as well as ion-ion interactions.
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