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Absorption measurement errors in single-mode fibers resulting from re-emission of radiation

Absorption measurement errors in single-mode fibers resulting from re-emission of radiation
Absorption measurement errors in single-mode fibers resulting from re-emission of radiation
We investigate errors in small-signal absorption spectra that result from re-emission in single-mode fibers with overlapping absorption and emission spectra. Experiments on Er-doped fibers and simulations of Er- and Yb-doped fibers show that the re-emission can severely distort the spectrum, especially the peak, under common measurement conditions, and underestimate the absorption by well over 10% already at 30-dB peak absorption, if only the source or the detector is spectrally filtered. Re-emission can then be the dominant source of errors. The error increases for higher absorption and higher fiber-NA. For sufficiently high NA, a significant error remains even in the limit of zero absorption and reaches 5% at the peak of a 0.46-NA Yb-doped fiber. Furthermore, in contrast to the high-absorption case, the error is larger at longer wavelengths than at the peak. Simultaneous filtering of both source and detector with 0.1-nm bandwidth reduces the re-emission error to ~1% or less up to 90-dB absorption. Then, detector noise or saturation errors are likely to dominate and render re-emission errors insignificant. A standard amplifier model is well suited to the simulations of the rich physics of single-mode-fiber absorption measurements.
0018-9197
Feng, Yutong
8257a816-5e4a-47bc-8aa2-e364c4d6e21e
Zhang, Betty Meng
93b8aca7-c6ae-45b9-9bcd-c201fdf2d116
Zhao, Junqing
71d8c669-59b0-4082-93b1-f0694f2736bf
Zhu, Sheng
0c71d889-2dbe-4bcc-add0-02e00d93cc77
Price, Jonathan
fddcce17-291b-4d01-bd38-8fb0453abdc8
Nilsson, Johan
f41d0948-4ca9-4b93-b44d-680ca0bf157b
Feng, Yutong
8257a816-5e4a-47bc-8aa2-e364c4d6e21e
Zhang, Betty Meng
93b8aca7-c6ae-45b9-9bcd-c201fdf2d116
Zhao, Junqing
71d8c669-59b0-4082-93b1-f0694f2736bf
Zhu, Sheng
0c71d889-2dbe-4bcc-add0-02e00d93cc77
Price, Jonathan
fddcce17-291b-4d01-bd38-8fb0453abdc8
Nilsson, Johan
f41d0948-4ca9-4b93-b44d-680ca0bf157b

Feng, Yutong, Zhang, Betty Meng, Zhao, Junqing, Zhu, Sheng, Price, Jonathan and Nilsson, Johan (2017) Absorption measurement errors in single-mode fibers resulting from re-emission of radiation. IEEE Journal of Quantum Electronics, 53 (4). (doi:10.1109/JQE.2017.2708610).

Record type: Article

Abstract

We investigate errors in small-signal absorption spectra that result from re-emission in single-mode fibers with overlapping absorption and emission spectra. Experiments on Er-doped fibers and simulations of Er- and Yb-doped fibers show that the re-emission can severely distort the spectrum, especially the peak, under common measurement conditions, and underestimate the absorption by well over 10% already at 30-dB peak absorption, if only the source or the detector is spectrally filtered. Re-emission can then be the dominant source of errors. The error increases for higher absorption and higher fiber-NA. For sufficiently high NA, a significant error remains even in the limit of zero absorption and reaches 5% at the peak of a 0.46-NA Yb-doped fiber. Furthermore, in contrast to the high-absorption case, the error is larger at longer wavelengths than at the peak. Simultaneous filtering of both source and detector with 0.1-nm bandwidth reduces the re-emission error to ~1% or less up to 90-dB absorption. Then, detector noise or saturation errors are likely to dominate and render re-emission errors insignificant. A standard amplifier model is well suited to the simulations of the rich physics of single-mode-fiber absorption measurements.

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Accepted/In Press date: 18 April 2017
e-pub ahead of print date: 26 May 2017
Published date: August 2017
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 410638
URI: http://eprints.soton.ac.uk/id/eprint/410638
ISSN: 0018-9197
PURE UUID: 0788decb-1ced-49e3-bf7b-8e81c848c23b
ORCID for Yutong Feng: ORCID iD orcid.org/0000-0002-6839-2106
ORCID for Sheng Zhu: ORCID iD orcid.org/0000-0002-4256-6307
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: 09 Jun 2017 09:16
Last modified: 07 Oct 2020 08:01

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