Suppression of stimulated Brillouin scattering in single-frequency fiber Raman amplifier through pump modulation
Suppression of stimulated Brillouin scattering in single-frequency fiber Raman amplifier through pump modulation
We propose and implement the use of an intensity modulated pump, counter-directional to a forward-propagating signal for suppressing unwanted stimulated Brillouin scattering (SBS) of spectrally narrow signals in optical fiber Raman amplifiers. The modulated Raman pump cross-phase-modulates and thus spectrally broadens the parasitic Brillouin Stokes wave traveling in the same (backward) direction. The parasitic SBS then decreases when the broadening exceeds the Brillouin gain bandwidth. By contrast, the modulated pump does not induce any significant cross-phase modulation on the signal, which therefore can remain spectrally narrow. We study the effect of the pump modulation frequency and modulation format and experimentally obtain nearly 5 dB of SBS threshold enhancement and over 50% pump-to-signal conversion efficiency.
3280-3289
Harish, Achar Vasant
7f282e07-ee2e-44b8-aaea-d64ddb598225
Nilsson, Johan
f41d0948-4ca9-4b93-b44d-680ca0bf157b
July 2019
Harish, Achar Vasant
7f282e07-ee2e-44b8-aaea-d64ddb598225
Nilsson, Johan
f41d0948-4ca9-4b93-b44d-680ca0bf157b
Harish, Achar Vasant and Nilsson, Johan
(2019)
Suppression of stimulated Brillouin scattering in single-frequency fiber Raman amplifier through pump modulation.
Journal of Lightwave Technology, 37 (13), .
(doi:10.1109/JLT.2019.2914081).
Abstract
We propose and implement the use of an intensity modulated pump, counter-directional to a forward-propagating signal for suppressing unwanted stimulated Brillouin scattering (SBS) of spectrally narrow signals in optical fiber Raman amplifiers. The modulated Raman pump cross-phase-modulates and thus spectrally broadens the parasitic Brillouin Stokes wave traveling in the same (backward) direction. The parasitic SBS then decreases when the broadening exceeds the Brillouin gain bandwidth. By contrast, the modulated pump does not induce any significant cross-phase modulation on the signal, which therefore can remain spectrally narrow. We study the effect of the pump modulation frequency and modulation format and experimentally obtain nearly 5 dB of SBS threshold enhancement and over 50% pump-to-signal conversion efficiency.
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Accepted/In Press date: 8 April 2019
e-pub ahead of print date: 30 April 2019
Published date: July 2019
Identifiers
Local EPrints ID: 441957
URI: http://eprints.soton.ac.uk/id/eprint/441957
ISSN: 0733-8724
PURE UUID: 60417190-6889-4c18-8e2d-a525fbe0f4da
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Date deposited: 03 Jul 2020 16:30
Last modified: 17 Mar 2024 02:47
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Author:
Achar Vasant Harish
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