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Spontaneous pump depolarization in ultralong cavity Raman fiber laser amplifiers
Optics Express
|November 25, 2018
Summary
We demonstrated polarization-independent Raman laser amplifiers using highly polarized pumps. Gain saturation causes depolarization, enabling stable output gain and low noise for optical communications.
Area of Science:
- Optics and Photonics
- Semiconductor Lasers
- Optical Amplification
Background:
- Raman laser amplifiers are crucial for optical communications.
- Controlling polarization is essential for stable amplifier performance.
- Highly polarized pumps are typically required for efficient amplification.
Purpose of the Study:
- To experimentally demonstrate polarization-independent performance in a 2nd-order ultralong cavity Raman laser amplifier.
- To investigate the effect of gain saturation on polarization behavior.
- To enable the use of highly polarized, low relative intensity noise (RIN) semiconductor laser diodes.
Main Methods:
- Utilizing a forward and backward-pumped 2nd-order ultralong cavity Raman laser amplifier.
- Employing highly polarized pump sources.
- Analyzing output gain and relative intensity noise (RIN) under varying conditions.
Main Results:
- Achieved polarization-independent performance in the Raman laser amplifier.
- Observed depolarization of the Stokes component due to gain saturation.
- Demonstrated stable output gain and low RIN irrespective of pump polarization.
Conclusions:
- Gain saturation-induced depolarization is key to achieving polarization-insensitive Raman laser amplifiers.
- This approach allows the use of readily available, highly polarized semiconductor laser diodes.
- Opens possibilities for cost-effective and robust optical communication systems.
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