Performance Enhancement of Ytterbium-Doped Fiber Amplifier Employing a Dual-Stage In-Band Asymmetrical Pumping

Area of Science:

• Optics and Photonics
• Laser Physics
• Materials Science

Background:

• Multi-stage pumping techniques can significantly enhance doped fiber amplifier performance.
• Optimization of pump parameters like optical power and wavelength is critical for achieving superior results.

Purpose of the Study:

• To report performance enhancement of a ytterbium-doped fiber amplifier (YDFA) in the 1.02-1.08 μm spectral region.
• To investigate a novel dual-stage in-band asymmetrical pumping scheme for YDFA optimization.

Main Methods:

• An optimized design utilizing a dual-stage in-band asymmetrical pumping scheme was employed.
• Accurate adjustment of optical pump power and wavelength in both stages, alongside optimized fiber length and Yb3+ doping concentration.

Main Results:

• A record peak gain of approximately 62.5 dB and an output power of 4.5 W were achieved at a signal wavelength of 1.0329 μm.
• A minimum noise figure (NF) of 4 dB was observed at the optimized parameters for a signal wavelength of 1.0329 μm.
• Investigated the effect of pump power distribution between stages on NF, noting increased NF with high first-stage and low second-stage pump power.

Conclusions:

• The novel dual-stage in-band asymmetrical pumping scheme effectively enhances YDFA performance.
• Optimized pump parameters, fiber length, and doping concentration are crucial for achieving high gain, output power, and low noise figures.