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Dynamic acousto-optic filters for gain flattening of optical amplifiers

Dynamic acousto-optic filters for gain flattening of optical amplifiers
Dynamic acousto-optic filters for gain flattening of optical amplifiers
Acousto-optic all-fibre filters are a promising technology for dynamic gain equalisation of optical fibre amplifiers. In this paper, we show that a controlled tapering of optical fibres can be regarded as a new degree of freedom for the design of acousto-optic filters. In particular, we investigate the coupling between the fundamental and several cladding modes, studying the evolution of the resonance conditions as the fibres are progressively tapered. Theoretical predictions are in agreement with experimental results for several tapered fibres. The application of this acousto-optic filter for gain equalisation of optical fibre amplifiers is demonstrated. The design consists of two cascaded tapered fibre lengths driven by only one acoustic frequency. The spectral characteristics are determined by the taper profile. The amplified spontaneous emission of an erbium doped fibre amplifier is flattened to within 1dB over a spectral range of 30nm for different saturation levels of the amplifier. This method results in a simplified implementation of the acousto-optic filter in contrast to other multi-frequency design approaches. Optimum filter designs can be achieved by the combination of both degrees of freedom: taper control and multi-frequency tuning
9729811504
556-560
Aotoridade Nacional de Comunicacoes
Alegria, C.
d1faa0e1-a7fb-4c9f-b02a-cdcc769a72f9
Feced, R.
b62081fc-fcad-48e6-a957-0ec55f6efe7f
Zervas, M.N.
1840a474-dd50-4a55-ab74-6f086aa3f701
Laming, R.I.
c86f359b-9145-4148-bc7d-ae4f3d272ca2
Alegria, C.
d1faa0e1-a7fb-4c9f-b02a-cdcc769a72f9
Feced, R.
b62081fc-fcad-48e6-a957-0ec55f6efe7f
Zervas, M.N.
1840a474-dd50-4a55-ab74-6f086aa3f701
Laming, R.I.
c86f359b-9145-4148-bc7d-ae4f3d272ca2

Alegria, C., Feced, R., Zervas, M.N. and Laming, R.I. (1999) Dynamic acousto-optic filters for gain flattening of optical amplifiers. In Proceedings of Conferencia de Telecomunicacoes '99. Aotoridade Nacional de Comunicacoes. pp. 556-560 .

Record type: Conference or Workshop Item (Paper)

Abstract

Acousto-optic all-fibre filters are a promising technology for dynamic gain equalisation of optical fibre amplifiers. In this paper, we show that a controlled tapering of optical fibres can be regarded as a new degree of freedom for the design of acousto-optic filters. In particular, we investigate the coupling between the fundamental and several cladding modes, studying the evolution of the resonance conditions as the fibres are progressively tapered. Theoretical predictions are in agreement with experimental results for several tapered fibres. The application of this acousto-optic filter for gain equalisation of optical fibre amplifiers is demonstrated. The design consists of two cascaded tapered fibre lengths driven by only one acoustic frequency. The spectral characteristics are determined by the taper profile. The amplified spontaneous emission of an erbium doped fibre amplifier is flattened to within 1dB over a spectral range of 30nm for different saturation levels of the amplifier. This method results in a simplified implementation of the acousto-optic filter in contrast to other multi-frequency design approaches. Optimum filter designs can be achieved by the combination of both degrees of freedom: taper control and multi-frequency tuning

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More information

Published date: 1999
Venue - Dates: Conferencia de Telecomunicacoes '99, Sesimbra, Portugal, 1999-04-14 - 1999-04-15

Identifiers

Local EPrints ID: 76494
URI: http://eprints.soton.ac.uk/id/eprint/76494
ISBN: 9729811504
PURE UUID: 38192a40-acfa-4988-b894-4bb73511eed6
ORCID for M.N. Zervas: ORCID iD orcid.org/0000-0002-0651-4059

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Date deposited: 11 Mar 2010
Last modified: 07 Oct 2020 03:21

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Contributors

Author: C. Alegria
Author: R. Feced
Author: M.N. Zervas ORCID iD
Author: R.I. Laming

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