Optical switching element between two optical guides and optical

Details Optical switching element between two optical guides and optical Optical switching element between two optical guides and optical

1987-12-22

1989-05-23

Sikes, William L.

350 9613, G02B 610

Patent

active

048324329

ABSTRACT:
An optical switching element including two parallel optical guides G.sub.1 and G.sub.2 each constituted by a strip of a semiconductor material having a refractive index n.sub.1 formed on a semiconductor substrate having a lower refractive index n.sub.0, the switching operation being obtained by the effect of voltages applied to electrodes arranged in the switching zone, characterized in that the latter is constituted by a strip of the same semiconductor material as the guides, which extends between the latter over a coupling length D between the abscissae -D/2 and +D/2 indicated on the orientated longitudinal axis of symmetry, and in that the electrodes are at least three in number, of which a first electrode permits of applying a reference voltage to the substrate, a second electrode extends substantially at the surface of the second guide from the abscissa -D to the abscissa -.epsilon., .epsilon. being small with respect to D, and a third electrode extends substantially at the surface of the first guide from the abscissa +.epsilon. to the abscissa +D, the second and third electrodes forming strips whose longitudinal axes of symmetry enclose with the optical axes of the second and first guides, respectively, an angle -.theta. defined on first approximation by the relation:

REFERENCES:
patent: 4185884 (1980-01-01), McMahon
patent: 4391486 (1983-07-01), Papuchon et al.

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