Optical waveguides – With optical coupler – Switch
Patent
1994-08-29
1995-10-24
Ullah, Akm E.
Optical waveguides
With optical coupler
Switch
G02B 600, G02B 636
Patent
active
054616840
ABSTRACT:
In a digital optical switch an input waveguide and two divergent output waveguides constitute a guide structure. A median gap between the two output waveguides constitutes a guide gap. Electrodes control the refractive indices of the two output waveguides to couple the input waveguide and one or both output waveguides depending on the value of a control signal. The width of the guide gap is increased in input and output transition areas to render the variation of this width more progressive therein. This is achieved by means of a median aperture at the end of the input waveguide and a progressive variation in the inclination of the facing edges of the output waveguides.
REFERENCES:
patent: 4932736 (1990-06-01), Su
patent: 5255334 (1993-10-01), Mak et al.
J. F. Vinchant et al, "Low Driving Voltage or Current Digital Opitcal Switch on InP for Multiwavelength System Applications", Electronics Letters, vol. 28, No. 12, Jun. 1992, pp. 1135-1137.
J. A. Cavailles et al, "First Digital Optical Switch Based on InP/GaInAsP Double Heterostructure Waveguides", Electronics Letters, vol. 27, No. 9, Apr. 1991, pp. 699-700.
H. Okayama et al, "Reduction of Voltage-Length Product for Y-Branch Digital Optical Switch", Journal of Lightwave Technology, vol. 11, No. 2, Feb. 1993, pp. 379-387.
French Search Report FR 489114.
Renaud Monique
Vinchant Jean-Francois
ALCATEL N.V.
Ullah Akm E.
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