Compact digital optical switch

Details Compact digital optical switch Compact digital optical switch

1995-12-07

1998-01-06

Palmer, Phan T. H.

Optical waveguides

With optical coupler

Switch

385 17, 385 18, 385 20, 385 31, G02B 626

Patent

active

057063745

ABSTRACT:
A digital optical switch in the shape of the letter "Y" at least an input optical waveguide and first and second output optical waveguides. Each output waveguide comprises at least a first part and a second part coupled by a transition in a transition region. An applied electrical control signal commands a refractive index difference between respective first parts of the output waveguides. At least one of the output optical waveguides has in a plane containing the output waveguides a guided propagation mode width that is lower in the second part than the mode width in the first part of the respective output waveguide. In a preferred implementation, the transition is an adiabatic transition. Applications include photonic routing and optical switching matrices.

REFERENCES:
patent: 5181262 (1993-01-01), van der Tol et al.
patent: 5461684 (1995-10-01), Vinchant et al.
Okayama H. et al, "8*8 Ti:LiNbO/sub 3/Waveguide Digital Optical Switch Matrix", IEICE Transactions on Communications, Feb. 1994, Japan, vol. E77-B, No. 2, ISSN 0916-8516, pp., 204-208, XP000447112.
Vinchant et al, "InP Digital Optical Switch: Key Element for Guided-Wave Photonic Switching", IEEE Proceedings J Optoelectronics), Oct. 1993, UK, vol. 140, No. 5, ISSN 0267-3932, pp. 301-307, XP 000412792
Cavailles, J. A. et al, "First Digital Optical Switch Bawed on InP/GaInAsP Double Heterostructure Waveguides", Electronics Letters, 25 Apr. 1991, UK, vol. 27, No. 9, ISSN 0013-5194, pp. 699-700 XP 000186217.
Okayama H. et al, "Reduction of Voltage-Length Product for Y-Branch Digital Optical Switch", Journal of Lightwave Technology, Feb. 1993, US, vol. 11, No. 2, ISSN 0733-8724, pp. 379-387.
Tanaka I et al, "Glass Waveguie 1*N Branching Devices", IEICE Transations on Communications, Sep. 1992, Japan, vol. E75-B, No. 9, ISSN 0916-8516, pp. 886-892, XP 000321324.

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