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Pump power depreciation by photodarkening in ytterbium-doped fibers and amplifiers

Pump power depreciation by photodarkening in ytterbium-doped fibers and amplifiers
Pump power depreciation by photodarkening in ytterbium-doped fibers and amplifiers
In this letter, pump power depreciation due to photodarkening effects in an ytterbium doped fiber (YDF) is investigated. Photodarkening is monitored by measuring the transmitted power at visible and pump wavelengths simultaneously, which renders direct quantitative measurement of pump power reduction rather than excess background loss. Our observation of substantial reduction in the pump power and the shortened fluorescence decay time in the photodarkened fiber indicates that the photodarkening influences pump efficiency. The effect of the photodarkening in a device level is also investigated by observing the performance of the YDF amplifier implementing the same YDF. The pump power depreciation of this fiber amplifier is quantitatively investigated by numerical simulation. The results suggest that operating at a saturated regime helps to subdue the photodarkening, with explanation in terms of population inversion density provided. The level of power depreciation is calculated to be 15%-30%, which matches our experimental observation.
1041-1135
115-118
Li, Nanxi
722fd7f9-31ac-4f85-b8b2-6133cbc9bf77
Yoo, Seongwoo
4714ed34-2088-4d00-a4bb-9d153384c36e
Yu, Xia
e6bca362-98cb-4720-a224-271bc760a6e3
Jain, Deepak
787e5045-8862-46ba-b15e-82c2fe60495f
Sahu, Jayanta K.
009f5fb3-6555-411a-9a0c-9a1b5a29ceb2
Li, Nanxi
722fd7f9-31ac-4f85-b8b2-6133cbc9bf77
Yoo, Seongwoo
4714ed34-2088-4d00-a4bb-9d153384c36e
Yu, Xia
e6bca362-98cb-4720-a224-271bc760a6e3
Jain, Deepak
787e5045-8862-46ba-b15e-82c2fe60495f
Sahu, Jayanta K.
009f5fb3-6555-411a-9a0c-9a1b5a29ceb2

Li, Nanxi, Yoo, Seongwoo, Yu, Xia, Jain, Deepak and Sahu, Jayanta K. (2014) Pump power depreciation by photodarkening in ytterbium-doped fibers and amplifiers. IEEE Photonics Technology Letters, 26 (2), 115-118. (doi:10.1109/LPT.2013.2289965).

Record type: Article

Abstract

In this letter, pump power depreciation due to photodarkening effects in an ytterbium doped fiber (YDF) is investigated. Photodarkening is monitored by measuring the transmitted power at visible and pump wavelengths simultaneously, which renders direct quantitative measurement of pump power reduction rather than excess background loss. Our observation of substantial reduction in the pump power and the shortened fluorescence decay time in the photodarkened fiber indicates that the photodarkening influences pump efficiency. The effect of the photodarkening in a device level is also investigated by observing the performance of the YDF amplifier implementing the same YDF. The pump power depreciation of this fiber amplifier is quantitatively investigated by numerical simulation. The results suggest that operating at a saturated regime helps to subdue the photodarkening, with explanation in terms of population inversion density provided. The level of power depreciation is calculated to be 15%-30%, which matches our experimental observation.

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Published date: 2014
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 361947
URI: http://eprints.soton.ac.uk/id/eprint/361947
ISSN: 1041-1135
PURE UUID: bfed62fa-7faf-48c3-a67d-fd4aaa7f6d62
ORCID for Jayanta K. Sahu: ORCID iD orcid.org/0000-0003-3560-6152

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Date deposited: 07 Feb 2014 11:20
Last modified: 08 Jan 2022 02:54

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Contributors

Author: Nanxi Li
Author: Seongwoo Yoo
Author: Xia Yu
Author: Deepak Jain
Author: Jayanta K. Sahu ORCID iD

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