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Non-destructive characterisation fibre couplers: the technique and its applications

Non-destructive characterisation fibre couplers: the technique and its applications
Non-destructive characterisation fibre couplers: the technique and its applications
A non-destructive technique for characterising couplers by means of a local perturbation is described. A CO laser beam is scanned along the coupler length inducing a local perturbation to the coupler eigenmodes. Asymmetric and symmetric perturbations give respectively, accurate mapping of power-evolution and coupler-waist shape. Using this technique, both the information of the power distribution and coupling profile along the coupler waist are obtained. The method is studied theoretically and verified experimentally by characterising different types of fused fibre-couplers namely: half-cycle, full-cycle and non-uniform half-cycle couplers. Add-drop multiplexers based on the inscription of Bragg gratings in the waist of fibre couplers have attracted some attention lately. The correct mapping of the power evolution along the coupler length gives the exact positions in the coupler waist where Bragg gratings should be written in order to obtain optimum add-drop operation. Recently, it was shown that non-uniform coupler structures based on two highly coupled lateral regions and a weakly coupled central region, can provide an ideal add-drop multiplexing operation. These couplers are characterised using the described coupler characterisation technique and the weakly coupled region, where the grating should be written, is clearly identified. This non-destructive method for characterising fibre couplers can be used as a tool for accessing the uniformity of the fabricated couplers waist or the influence of the tapered transition regions in the coupler performance. Additionally it can be used to optimise the performance of add-drop multiplexers based on the inscription of Bragg gratings in the waist of fibre-couplers.
Alegria, Carlos
1c383dcc-0d78-45ab-98dd-be1623f928ff
Zervas, Michalis N.
1840a474-dd50-4a55-ab74-6f086aa3f701
Alegria, Carlos
1c383dcc-0d78-45ab-98dd-be1623f928ff
Zervas, Michalis N.
1840a474-dd50-4a55-ab74-6f086aa3f701

Alegria, Carlos and Zervas, Michalis N. (2002) Non-destructive characterisation fibre couplers: the technique and its applications. Fiber-based Component Fabrication, Testing, and Connectorization, Brugge, Belgium. 28 - 30 Oct 2002. (doi:10.1117/12.468515).

Record type: Conference or Workshop Item (Paper)

Abstract

A non-destructive technique for characterising couplers by means of a local perturbation is described. A CO laser beam is scanned along the coupler length inducing a local perturbation to the coupler eigenmodes. Asymmetric and symmetric perturbations give respectively, accurate mapping of power-evolution and coupler-waist shape. Using this technique, both the information of the power distribution and coupling profile along the coupler waist are obtained. The method is studied theoretically and verified experimentally by characterising different types of fused fibre-couplers namely: half-cycle, full-cycle and non-uniform half-cycle couplers. Add-drop multiplexers based on the inscription of Bragg gratings in the waist of fibre couplers have attracted some attention lately. The correct mapping of the power evolution along the coupler length gives the exact positions in the coupler waist where Bragg gratings should be written in order to obtain optimum add-drop operation. Recently, it was shown that non-uniform coupler structures based on two highly coupled lateral regions and a weakly coupled central region, can provide an ideal add-drop multiplexing operation. These couplers are characterised using the described coupler characterisation technique and the weakly coupled region, where the grating should be written, is clearly identified. This non-destructive method for characterising fibre couplers can be used as a tool for accessing the uniformity of the fabricated couplers waist or the influence of the tapered transition regions in the coupler performance. Additionally it can be used to optimise the performance of add-drop multiplexers based on the inscription of Bragg gratings in the waist of fibre-couplers.

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More information

e-pub ahead of print date: 2002
Additional Information: (SPIE 4943)
Venue - Dates: Fiber-based Component Fabrication, Testing, and Connectorization, Brugge, Belgium, 2002-10-28 - 2002-10-30

Identifiers

Local EPrints ID: 63350
URI: http://eprints.soton.ac.uk/id/eprint/63350
PURE UUID: 5fd43004-fbf6-4f45-86cc-69b19b903553
ORCID for Michalis N. Zervas: ORCID iD orcid.org/0000-0002-0651-4059

Catalogue record

Date deposited: 22 Oct 2008
Last modified: 18 Feb 2021 16:39

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