Jpn. J. Appl. Phys. 17 (1978) pp. 1231-1243  |Next Article|  |Table of Contents|
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Optical Tunable Switched Directional Couplers Consisting of Two Thin-Film Waveguides Using Surface Acoustic Waves

Tosio Kondo, Yasumitsu Miyazaki and Yasuo Akao

(Received December 10, 1977)

Control methods of the fraction of optical power transferred between two waveguides using a collinear acousto-optic interaction is theoretically investigated. The effect of a surface acoustic wave (a SAW) on the mode coupling between the fundamental even and odd eigenmodes of a directional coupler system is analysed and two control methods of optical power transferred are proposed. The required SAW powers of the switched couplers using SAW's and thin-film acousto-optic devices such as optical beam deflectors and optical mode convertors are comparable to one another. The efficiently controllable bandwidth of the optical wavelength λ₀ are approximately 100 Å and 40 Å at λ₀≃0.63 µm for the symmetric and asymmetric switched couplers with the SAW wavelength of 25 µm and the interaction length of 8 mm. The optical center wavelength of the controllable range can be tuned by the SAW frequency.

URL: http://jjap.jsap.jp/link?JJAP/17/1231/
DOI: 10.1143/JJAP.17.1231

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