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Acousto-optic effect in optical fiber tapered structures for the design of filters

Acousto-optic effect in optical fiber tapered structures for the design of filters
Acousto-optic effect in optical fiber tapered structures for the design of filters
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 multi-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.
11/1-11/6
Institute of Electrical and Electronics Engineers
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. (1998) Acousto-optic effect in optical fiber tapered structures for the design of filters. In, IEE Colloquium on New Developments in Optical Amplifiers (Ref. No. 1998/492). IEE Colloquium on New Developments in Optical Amplifiers Piscataway, United States. Institute of Electrical and Electronics Engineers, 11/1-11/6.

Record type: Book Section

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 multi-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: 1998
Venue - Dates: IEE Colloquium on New Developments in Optical Amplifiers, United Kingdom, 1998-11-01 - 1998-11-06

Identifiers

Local EPrints ID: 76599
URI: https://eprints.soton.ac.uk/id/eprint/76599
PURE UUID: 027e1c64-6d77-4d49-963a-60beaadaca75
ORCID for M.N. Zervas: ORCID iD orcid.org/0000-0002-0651-4059

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Date deposited: 11 Mar 2010
Last modified: 02 Oct 2018 00:37

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