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Beat length measurement in directional couplers by thermo-optic modulation

Record type: Article

In integrated optical directional couplers formed by two parallel waveguides, we measure the difference Delta beta = beta(even) - beta(odd) 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 lambda = 2pi/Delta beta. 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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Citation

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), pp. 1189-1191. (doi:10.1364/OL.21.001189).

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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

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Date deposited: 11 Mar 2010
Last modified: 18 Jul 2017 23:27

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Contributors

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

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