Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1993-05-14
1994-11-15
Chilcot, Jr., Richard E.
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359117, 25022712, 385 12, H04J 1408
Patent
active
053653599
ABSTRACT:
What is hereof proffered is a method and apparatus for optically multiplexing together a plurality of optical modulation devices on a limited number of optical transmission paths utilizing electrically passive photoactivated optical switches. The switches have the characteristic that prior to illumination, an input channel is coupled to a specific output channel. Following illumination, after a characteristic time delay, t, a first switch activates so that the input channel is disconnected from the first output channel and connected to a second output channel. It remains connected to the second output channel until the illumination is removed at which time the input channel is disconnected from the second output channel and reconnected to the first output channel. The switches are arranged sequentially along an outwardly directed optical transmission path. When optical power is coupled into the path, as it reaches each switch, the total power is sequentially switched off the path into alternate optical transmission paths and then coupled back onto the outwardly directed optical transmission path. An optical modulator on each alternate optical transmission path modulates the optical signal through it. The modulated optical signals are directed to a signal processing location along one or more inwardly directed optical transmissions paths. At the signal processing location, time windowing demodulates the signals from each modulation device.
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Catamount Scientific, Inc.
Chilcot Jr. Richard E.
Negash Kinfe-Michael
Welch John J.
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