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OPTICAL WAVEGUIDE MODULATOR USING PIEZOELECTRIC ELEMENTS

IP.com Disclosure Number: IPCOM000025308D
Original Publication Date: 1984-Aug-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 91K

Publishing Venue

Xerox Disclosure Journal

Abstract

A well-known property of piezoelectric materials is the dimensional change that results from the application of an electric field. This dimensional variation can be used to modulate the coupling efficiency of an optical waveguide coupler, and thereby modulate the intensity of the light coupled in or out of the guide.

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XEROX DISCLOSURE JOURNAL

OPTICAL WAVEGUIDE MODULATOR USING PIEZOELECTRIC ELEMENTS James C. Maher
Paul J. Cressman
P. Keith Watson

Proposed Classification
U.S. C.1. 350/96 Int. CI. G02b 5/14

I I

Volume 9 Number 4 July/August 1984 255

[This page contains 1 picture or other non-text object]

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OPTICAL WAVEGUIDE MODULATOR USING PIEZOELECTRIC ELEMENTS (Cont'd)

A well-known property of piezoelectric materials is the dimensional change that results from the application of an electric field. This dimensional variation can be used to modulate the coupling efficiency of an optical waveguide coupler, and thereby modulate the intensity of the light coupled in or out of the guide.

When an electric field is applied across the thickness of, for examnle, a oolv- vinylidene fluoride (PVF 1 film, it will change its dimensions in proportion to the magnitude of the field in%oth the thickness and length direction.

The two most popular techniques for coupling light into a planar optical waveguide are through the use of prism film couplers and grating couplers. In each case, the dimensions of the coupling region are a critical factor in determining the efficiency of the coupler. In the case of the prism coupler, the gap between the base of the prism and the waveguide is the essential parameter for determining the coupling efficiency. For the case of the grating coupler, the efficiencv is determined by the input angle and the grating spacing. In each of the above cases, the dimensional change in the guide could inhibit or enhance the coupling depending on the many parameters of the waveguide configuration.

In Figure 1, the coupling gap 18 bet...