Optical waveguides – With optical coupler – Switch
Reexamination Certificate
2005-08-23
2005-08-23
Assaf, Fayez G. (Department: 2872)
Optical waveguides
With optical coupler
Switch
C385S018000, C385S019000
Reexamination Certificate
active
06934438
ABSTRACT:
A closed loop alignment system for cross-connect switches in optical telecommunications systems. Arrays of small tiltable mirrors within the switch direct the signal beams between optical fiber arrays connected to the switch. An external alignment system is incorporated into the cross-connect switch and is employed to provide an alignment beam of a wavelength different from the signal beams. Beam splitters such as dichroic mirrors, which pass the signal beams but pass only a portion of the alignment beams, are placed in the beam paths to image the ends of the optical fibers of the arrays. A combined image of the ends of the optical fibers from each array is reflected onto a photodetector array, output signals of which are sent to a feedback control system for comparison of the combined image to a stored tolerance range and consequently moves the tiltable mirrors as necessary for proper alignment.
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Agilent Technologie,s Inc.
Assaf Fayez G.
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