Optical waveguides – Having nonlinear property
Patent
1994-06-20
1997-01-21
Healy, Brian
Optical waveguides
Having nonlinear property
385 1, 385 5, 385 11, 385 24, 385 42, 385 36, 372 21, 359127, 359134, 359160, 359129, G02B 600, H01S 310, H04J 1402
Patent
active
055966675
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates generally to an application of phase conjugate optics to optical communications, optical measurement, optical information processing and some other fields. More particularly, the present invention relates in the first place to a phase conjugate light generation apparatus as well as a repeater optical transmission system, a bi-directional repeater optical transmission system, an optical distribution system, an optical switching system, an optical channel selection system and an optical AND circuit system which include such an apparatus. In the second place, the present invention relates to an optical communications system which employs phase conjugate light, and in the third place relates to an optical modulator which can be applied to those systems.
First, description will be given of the first application field of the present invention. The following embodiments of the present invention relate to a phase conjugate light generation apparatus as well as a repeater optical transmission system, a bi-directional repeater optical transmission system, an optical distribution system, an optical switching system, an optical channel selection system and an optical AND circuit system.
Employment of non-linear optics allows achievement of a novel function which has not been obtained by the conventional optical technology and allows improvement in the characteristics of an optical system. Particularly, employment of phase conjugate light, to which investigations have been directed actively in recent years, allows a wide variety of applications of the optical technology, from compensation for phase fluctuation or chromatic dispersion in an optical transmission line, reading of high density information, amplification with low noise, production of a quantum condition such as a squeezed condition and so forth.
BACKGROUND ART
Conventionally, in order to realize such functions as, for example, amplification of light, splitting and addition of information, several optical devices having the individual functions (in particular, an optical amplifier, an optical splitter, an optical coupler and so forth) are combined to construct a system. Meanwhile, for example, for phase fluctuation, chromatic dispersion, etc., phenomenon which occurs in an optical transmission line, a method is principally employed wherein compensation for such phenomena is performed on the sending and receiving sides of a signal, particularly on the receiving side.
It is an object of the present invention in a first application field to provide a phase conjugate light generation apparatus which has a novel construction application and can be applied to various optical systems.
It is another object of the present invention in the first application field to provide a useful optical system which includes such a phase conjugate light generation apparatus.
DISCLOSURE OF THE INVENTION
A phase conjugate light generation apparatus of the present invention comprises a non-linear optical medium, a pump light source for outputting pump light, signal light/pump light supply means for supplying input signal light supplied to a signal light input port to the non-linear optical medium together with the pump light from the pump light source, and signal light/phase conjugate light extraction means for extracting output signal light and phase conjugate light generated by an interaction between the input signal light and the pump light supplied to the non-linear optical medium and outputting the output signal light and the phase conjugate light from a signal light output port and a phase conjugate light output port, respectively.
A repeater optical transmission system of the present invention comprises a sending station, a receiving station, an optical transmission line laid between the sending station and the receiving station, and at least one repeating station interposed intermediately of the optical transmission line, the repeating station including the phase conjugate light generation apparatus of the present invention, the p
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Fujitsu Limited
Healy Brian
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