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1.3 µm Raman-bismuth fiber amplifier pumped by semiconductor disk laser
A Chamorovskiy1, J Rautiainen, A Rantamäki
1Optoelectronics Research Centre, Tampere University of Technology, Tampere, Finland. alexander.chamorovskiy@tut.fi
Optics Express
|April 1, 2011
Summary
This study presents a novel hybrid Raman-bismuth fiber amplifier. This dual-gain system achieves 18 dB small-signal gain, a 9 dB improvement over isolated Raman amplifiers, enhancing O-band amplification.
Area of Science:
- Optoelectronics
- Fiber Optics
Background:
- Fiber amplifiers are crucial for optical communication.
- Hybrid amplification systems offer potential for enhanced performance.
Purpose of the Study:
- To develop and characterize a hybrid Raman-bismuth fiber amplifier.
- To investigate the performance benefits of a dual-gain system pumped by a single laser source.
Main Methods:
- A hybrid Raman-bismuth fiber amplifier was designed and tested.
- Co-propagation configuration using a 1.22 µm semiconductor disk laser as the pump source.
- Performance was evaluated by measuring small-signal gain and comparing it to an isolated Raman amplifier.
Main Results:
- Achieved a small-signal gain of 18 dB at 1.3 W pump power.
- Demonstrated a 9 dB gain improvement compared to an isolated Raman amplifier.
- Showcased efficient utilization of residual pump power by the bismuth-doped fiber, increasing conversion efficiency.
Conclusions:
- The hybrid Raman-bismuth fiber amplifier offers significant performance gains.
- The dual-gain system enables efficient amplification in the O-band spectral range.
- Low noise and high beam quality of the pump laser contribute to efficient core-pumping of single-mode fiber systems.
