Optical waveguides – Directional optical modulation within an optical waveguide – Acousto-optic
Patent
1991-09-19
1993-03-02
Ullah, Akm E.
Optical waveguides
Directional optical modulation within an optical waveguide
Acousto-optic
369 4411, G02B 600, G02B 636
Patent
active
051916240
ABSTRACT:
An optical waveguide is comprised of an optical substrate and an optical thin-film optical waveguide layer and formed such that ##EQU1## where .theta. is an output angle, n.sub.o1 is an ordinary refractive index of the optical substrate for an ordinary beam, n.sub.e1 is an extraordinary refractive index of the optical substrate for an extraordinary beam, n.sub.o2 is an ordinary refractive index of the optical thin-film optical waveguide layer for the ordinary beam and n.sub.e2 is an extraordinary refractive index of the optical thin-film optical waveguide layer for the extraordinary beam, and an electrode for generating a surface acoustic wave for diffracting light is formed on the optical waveguide to construct a collinear optical deflector. A method for production of the optical thin-film optical waveguide layer is exemplified wherein a target made of tantalic lilthium niobate or tantalic lithium niobate magnesium and an optical substrate made of lithium tantalate are prepared and an optical thin-film optical waveguide layer having a composition of tantalic lithium niobate or tantalic lithium niobate magnesium is formed on the optical substrate through an ion beam sputtering process into which oxygen can be introduced. Proton substitutes for part of an element constituting the optical thin-film optical waveguide layer.
REFERENCES:
patent: 3655261 (1972-04-01), Chang
patent: 4738501 (1988-04-01), Sunagawa et al.
Li et al., "Electrooptic Constants In Ion-Exchanged . . . Waveguides", Inst. of Electronic Inf. Commun.,, Tech. Report OQE86-119, pp. 15-22.
Hinkov et al., "Efficient Acoustooptical Coupling . . . In . . . Channel Guide," IEEE Int. Guided Wire Optics, Paper TUAA4-1 (1989), pp. 138-141.
Hinkov et al., "Integrated Acousto-Optic Collinear . . . Mode Convertors . . . ", Electronics Lett., vol. 27, No. 13, Jun. 20, 1991, pp. 1211-1213.
Fukushima Atsuko
Hira Yasuo
Inagaki Akira
Ito Kenchi
Kanda Naoya
Hitachi , Ltd.
Ullah Akm E.
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