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Analysis of spectral bendloss filtering in a cladding-pumped W-type fiber Raman amplifier

Analysis of spectral bendloss filtering in a cladding-pumped W-type fiber Raman amplifier
Analysis of spectral bendloss filtering in a cladding-pumped W-type fiber Raman amplifier
We design a double-clad fiber with a W-type core for use in a cladding-pumped fiber Raman amplifier operating at the 1st-Stokes wavelength. Compared to a conventional step-index core, a W-type core allows for a larger inner cladding so that pump sources with relatively poor beam quality can be utilized. This is because parasitic Raman conversion to the 2nd Stokes can be suppressed by bending loss, while the sharp spectral characteristics of a W-type fiber allows the loss to be kept low at the 1st Stokes. Without bendloss filtering, the ratio between the inner-cladding area and the effective area of the Stokes wave is limited to approximately eight. With a bendloss-filtered W-type fiber, area ratios of 34 are possible for core diameters up to around 18µm and inner-cladding diameters up to around 82µm.We also discuss limitations on the brightness enhancement due to optical damage and pump-signal walk-off in the pulsed regime
0733-8724
2179-2186
Ji, Junhua
b8f18985-425b-4077-9242-9e624e80299c
Codemard, C.A.
3aa50483-b61c-4e7e-b178-c9a88bb47bef
Nilsson, J.
f41d0948-4ca9-4b93-b44d-680ca0bf157b
Ji, Junhua
b8f18985-425b-4077-9242-9e624e80299c
Codemard, C.A.
3aa50483-b61c-4e7e-b178-c9a88bb47bef
Nilsson, J.
f41d0948-4ca9-4b93-b44d-680ca0bf157b

Ji, Junhua, Codemard, C.A. and Nilsson, J. (2010) Analysis of spectral bendloss filtering in a cladding-pumped W-type fiber Raman amplifier. IEEE Journal of Lightwave Technology, 28 (15), 2179-2186. (doi:10.1109/JLT.2010.2052786).

Record type: Article

Abstract

We design a double-clad fiber with a W-type core for use in a cladding-pumped fiber Raman amplifier operating at the 1st-Stokes wavelength. Compared to a conventional step-index core, a W-type core allows for a larger inner cladding so that pump sources with relatively poor beam quality can be utilized. This is because parasitic Raman conversion to the 2nd Stokes can be suppressed by bending loss, while the sharp spectral characteristics of a W-type fiber allows the loss to be kept low at the 1st Stokes. Without bendloss filtering, the ratio between the inner-cladding area and the effective area of the Stokes wave is limited to approximately eight. With a bendloss-filtered W-type fiber, area ratios of 34 are possible for core diameters up to around 18µm and inner-cladding diameters up to around 82µm.We also discuss limitations on the brightness enhancement due to optical damage and pump-signal walk-off in the pulsed regime

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Published date: August 2010

Identifiers

Local EPrints ID: 177087
URI: https://eprints.soton.ac.uk/id/eprint/177087
ISSN: 0733-8724
PURE UUID: 74fa8bcd-477f-4a01-b4ea-3d85a3aafc1b
ORCID for J. Nilsson: ORCID iD orcid.org/0000-0003-1691-7959

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Date deposited: 15 Mar 2011 14:37
Last modified: 20 Jul 2019 01:11

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Contributors

Author: Junhua Ji
Author: C.A. Codemard
Author: J. Nilsson ORCID iD

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