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Absorption measurement effects in fibres with multimode cores

Absorption measurement effects in fibres with multimode cores
Absorption measurement effects in fibres with multimode cores
Absorption is a key characteristic of any laser medium and is often the first thing to measure. While this is rather straightforward, several factors can impair the accuracy, e.g., a non-negligible fraction of excited laser ions, nonlinear conversion, and, in multimode structures, differences in absorption between different modes. In multimode structures, mode-coupling is also important. We have previously investigated another error mechanism which had not yet been considered, namely re-emission of radiation into the absorption band of three-level systems [1]. We found that it can induce significant errors in single-mode fibres. Here, we extend those investigations to simulations of Yb-doped fibres with multimode step-index cores, focusing on the case of negligible mode-coupling. As before [1], we use as tandard fibre amplifier model as implemented in RP Fiber Power to simulate white-light absorption measurements. Previously, with a single-mode Er-doped fibre, we found that this approach led to excellent agreement with measured data even for the difficult case of high absorption (up to 60 dB, with errors approaching 50 %).
Zhang, Meng
ed5e0d51-9f57-41c5-95ac-328fd19e9325
Feng, Yutong
8257a816-5e4a-47bc-8aa2-e364c4d6e21e
Price, Jonathan
fddcce17-291b-4d01-bd38-8fb0453abdc8
Paschotta, Rüdiger
8f28d68b-f61f-4192-a0cd-a0d0f688b97d
Nilsson, Johan
f41d0948-4ca9-4b93-b44d-680ca0bf157b
Zhang, Meng
ed5e0d51-9f57-41c5-95ac-328fd19e9325
Feng, Yutong
8257a816-5e4a-47bc-8aa2-e364c4d6e21e
Price, Jonathan
fddcce17-291b-4d01-bd38-8fb0453abdc8
Paschotta, Rüdiger
8f28d68b-f61f-4192-a0cd-a0d0f688b97d
Nilsson, Johan
f41d0948-4ca9-4b93-b44d-680ca0bf157b

Zhang, Meng, Feng, Yutong, Price, Jonathan, Paschotta, Rüdiger and Nilsson, Johan (2016) Absorption measurement effects in fibres with multimode cores. 7th EPS-QEOD Europhoton Conference: Solid State, Fibre, and Waveguide Coherent Light Sources, Austria. 21 - 26 Aug 2016. (In Press)

Record type: Conference or Workshop Item (Poster)

Abstract

Absorption is a key characteristic of any laser medium and is often the first thing to measure. While this is rather straightforward, several factors can impair the accuracy, e.g., a non-negligible fraction of excited laser ions, nonlinear conversion, and, in multimode structures, differences in absorption between different modes. In multimode structures, mode-coupling is also important. We have previously investigated another error mechanism which had not yet been considered, namely re-emission of radiation into the absorption band of three-level systems [1]. We found that it can induce significant errors in single-mode fibres. Here, we extend those investigations to simulations of Yb-doped fibres with multimode step-index cores, focusing on the case of negligible mode-coupling. As before [1], we use as tandard fibre amplifier model as implemented in RP Fiber Power to simulate white-light absorption measurements. Previously, with a single-mode Er-doped fibre, we found that this approach led to excellent agreement with measured data even for the difficult case of high absorption (up to 60 dB, with errors approaching 50 %).

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MM Absorption Europhoton 2016 d.pdf - Accepted Manuscript
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Accepted/In Press date: 10 June 2016
Venue - Dates: 7th EPS-QEOD Europhoton Conference: Solid State, Fibre, and Waveguide Coherent Light Sources, Austria, 2016-08-21 - 2016-08-26
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 399344
URI: http://eprints.soton.ac.uk/id/eprint/399344
PURE UUID: d6c832d3-5cc2-4136-8bfc-03dfdb362806
ORCID for Yutong Feng: ORCID iD orcid.org/0000-0002-6839-2106
ORCID for Jonathan Price: ORCID iD orcid.org/0000-0003-0256-9172
ORCID for Johan Nilsson: ORCID iD orcid.org/0000-0003-1691-7959

Catalogue record

Date deposited: 11 Aug 2016 16:21
Last modified: 29 Jun 2020 00:33

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Contributors

Author: Meng Zhang
Author: Yutong Feng ORCID iD
Author: Jonathan Price ORCID iD
Author: Rüdiger Paschotta
Author: Johan Nilsson ORCID iD

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