Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1994-04-11
1995-10-10
Boudreau, Leo H.
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359187, 359194, H04J 1408
Patent
active
054575591
ABSTRACT:
A signal light and a clock light which is generated by a clock light generator are propagated through a non-linear optical medium of, for instance, a silica based single mode optical fiber, from which the signal and clock lights and a four-wave mixing light are obtained. One light, for instance, the four-wave mixing light is extracted from the output lights of the non-linear optical medium, and a control signal which is dependent on a time-mean value in power of the extracted light is applied to a voltage controlled oscillator (VCO) for driving the clock light generator. Thus, a clock light which is locked in phase to the signal light is obtained. In case where the signal light comprises N time-division sequential lights (N=1, 2, 3, - - -), and a clock frequency of the clock light is 1/N of a clock frequency of the signal light, each one of the N time-division seaquential lights is shifted in phase or frequency by the non-linear optical medium, so that the phase or frequency shifted sequential light is switched to be demultiplexed by a switch device such as an optical coupler and a polarization beam splitter.
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Henmi Naoya
Saito Tomoki
Boudreau Leo H.
NEC Corporation
Negash Kinfe-Michael
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