Optical waveguides – With optical coupler – Switch
Reexamination Certificate
2005-09-13
2005-09-13
Font, Frank G. (Department: 2883)
Optical waveguides
With optical coupler
Switch
C385S024000, C398S034000, C398S045000
Reexamination Certificate
active
06944362
ABSTRACT:
Optical switches are provided in an optical transmission system having at least two optical nodes in optical communication over a primary optical path and a backup optical path. An optical switch is located in each of the optical nodes. Each of the optical switches includes a switching element having an input port and a plurality of output ports coupled to the primary and backup optical paths, respectively. The switching element has a first state optically coupling an optical signal from the input port to the primary path and a second state optically coupling an optical signal from the input port to the backup path. First and second optical taps are located in the primary optical path. Third and fourth optical taps are located in the backup optical path. A first photodetector is optically coupled to the second optical tap for receiving a portion of the optical signal traveling in the primary optical path. A second photodetector is optically coupled to the third optical tap for receiving a portion of the optical signal traveling in the secondary optical path. A first optical path optically couples the first optical tap to the fourth optical tap such that a portion of an optical signal traveling in the secondary path is coupled onto the primary path. Finally, a controller is electrically coupled to each of the optical switches. The controller is configured so that when each of the switching elements are in the second state and the first photodetector in each of the optical switches detects an optical signal, the controller returns the switching elements to the first state.
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Castor: Precision Optical Switches for High Reliability Networks; date unknown, but before the filing date of U.S. App. 10/364,825.
Constellation Series, Section 12. Castor 2×2 Optical Switch. pp. 12-1 to 12-16. Release date: Aug. 1999—Revision 0.
Constellation Series, Section 11. Castor 2×1 Optical Switch. pp. 11-1 to 11-16. Release date: Aug. 1999—Revision 0.
Synchronous: Castor Precision Optical Switches for High Reliability Networks. http://www.synchronous.net/products/castor.html; accessed Oct. 8, 2002.
El-Shammaa Mary
Font Frank G.
General Instrument Corporation
Mayer Fortkort & Williams PC
Mayer, Esq. Stuart H.
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