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Summary: 1446 OPTICS LETTERS / Vol. 15, No. 24 / December 15, 1990
High-efficiency single-order waveguide grating coupler
I. A. Avrutsky, A. S. Svakhin, and V. A. Sychugov
Institute of General Physics, Academy of Sciences of the USSR, 117942 Moscow, USSR
0. Parriaux
Swiss Center for Electronics and Microtechnology,CH-2000Neuchatel, Switzerland
Received May 3, 1990; accepted October 17, 1990
High-efficiency single-order grating coupling between an optical waveguided mode and a volume wave is achieved
by means of a double-sided corrugated cover film that has phase-shifted undulations. A greater than 90%
outcoupling ratio into air is demonstrated for weakly guiding ion-exchanged waveguides. The conditions for
efficientcoupling and the tolerances onthem are established.
The achievement of high-efficiency coupling to and
from integrated-optic waveguides is the essential
practical problem that must besolvedto permit exten-
sive use of integrated-optic circuits in industrial com-
munication and sensor systems. The couplingof light
from a laser or a fiber into an integrated-optic wave-
guide is currently most often made by end firing. The
main advantage is high coupling efficiency;a 50-95%
coupling efficiency can be obtained, depending on the
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