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Beat length measurement in directional couplers by thermo-optic modulation

Beat length measurement in directional couplers by thermo-optic modulation
Beat length measurement in directional couplers by thermo-optic modulation
In integrated optical directional couplers formed by two parallel waveguides, we measure the difference Δβ = βeven - βodd between the propagation constants of the 'supermodes'. They are coupled locally by heating a fine spot on one of the guides. When the spot is scanned along the coupler the output power from one of the guides is found to vary periodically. The period of variation is the modal beat length λ = 2π/Δβ. We demonstrate this technique with directional couplers fabricated by K+-exchange in glass. Beat lengths in the range of 0.6 ... 2.2 mm are measured with an accuracy of ±0.3%.
0146-9592
1189-1191
Gnewuch, H.
bb752678-6981-4d39-adc7-db6efde25d33
Román, J.E.
33f9c6e7-9fb1-43fe-9253-e15b170951dc
Hempstead, M.
1bc4f2eb-fba7-46b8-b0c6-199f586b9954
Wilkinson, J.S.
73483cf3-d9f2-4688-9b09-1c84257884ca
Ulrich, R.
1357c986-39c9-4069-b09a-a2f6c1e2b5ba
Gnewuch, H.
bb752678-6981-4d39-adc7-db6efde25d33
Román, J.E.
33f9c6e7-9fb1-43fe-9253-e15b170951dc
Hempstead, M.
1bc4f2eb-fba7-46b8-b0c6-199f586b9954
Wilkinson, J.S.
73483cf3-d9f2-4688-9b09-1c84257884ca
Ulrich, R.
1357c986-39c9-4069-b09a-a2f6c1e2b5ba

Gnewuch, H., Román, J.E., Hempstead, M., Wilkinson, J.S. and Ulrich, R. (1996) Beat length measurement in directional couplers by thermo-optic modulation. Optics Letters, 21 (15), 1189-1191. (doi:10.1364/OL.21.001189).

Record type: Article

Abstract

In integrated optical directional couplers formed by two parallel waveguides, we measure the difference Δβ = βeven - βodd between the propagation constants of the 'supermodes'. They are coupled locally by heating a fine spot on one of the guides. When the spot is scanned along the coupler the output power from one of the guides is found to vary periodically. The period of variation is the modal beat length λ = 2π/Δβ. We demonstrate this technique with directional couplers fabricated by K+-exchange in glass. Beat lengths in the range of 0.6 ... 2.2 mm are measured with an accuracy of ±0.3%.

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Published date: August 1996

Identifiers

Local EPrints ID: 78087
URI: http://eprints.soton.ac.uk/id/eprint/78087
ISSN: 0146-9592
PURE UUID: 2cc47196-51db-4834-9391-6be140c96b92
ORCID for J.S. Wilkinson: ORCID iD orcid.org/0000-0003-4712-1697

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Date deposited: 11 Mar 2010
Last modified: 14 Mar 2024 02:32

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Contributors

Author: H. Gnewuch
Author: J.E. Román
Author: M. Hempstead
Author: J.S. Wilkinson ORCID iD
Author: R. Ulrich

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