Optical coupling device and optical switch for use in the coupli

Details Optical coupling device and optical switch for use in the coupli Optical coupling device and optical switch for use in the coupli

1996-11-22

1998-06-02

Ngo, John

Optical waveguides

With optical coupler

Switch

385 14, 385129, 385 9, 385 45, 385 21, G02B 626

Patent

active

057613532

ABSTRACT:
An optical coupling device for a node in a self-healing optical network, wherein the number of switching elements is reduced by using a novel type of optical 2.times.2-switch. The switch has two switching states: (i) a bar state (ss1) in which a first and a second main port are optically coupled through to a first and a second secondary port, respectively; and (ii) a half-cross state (ss2) in which the main ports are coupled through to one another and in which the secondary ports are not involved in any through-coupling. An integrated design of the switch is based on two asymmetric Y-junctions coupled to one another via a common side branch in which electrodes are active in order to vary the propagation constant. Accordingly, a compact, integrated version of the optical coupling device with only two switching elements can be achieved.

REFERENCES:
patent: 4932735 (1990-06-01), Koai
patent: 5640471 (1997-06-01), Khan et al.
F. R. El-Akkari et al., "Electrooptical Channel Waveguide Matrix Switch Using Total Internal Reflection", Topical Meeting on Integrated and Guided Wave Optics, 1980, Paper TuE4/1-4, published by IEEE, New York.
W. Burns et al; "Mode Conversion in Planar-Dielectric Separating Waveguides"; 1975; pp. 32-39; IEEE Journal of Quantum Electronics, vol. QE-11, No. 1; Jan. 1975.
T. Wu et al; "A Novel Passive Protected SONET Bi-Directional Self-Healing Ring Architecture"; 1991; pp. 0894-0900; IEEE.
T. Wu; "Fiber Network Service Survivability"; 1992; pp. 162-173; Artech House, Boston 1992.

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