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US 5,596,667 AGranted
Application of phase conjugate optics to optical systems
AssigneeFujitsu Limited
InventorShigeki Watanabe
Life of this patent
Estimating the term…
Abstract
A phase conjugate light generation apparatus for various optical systems, wherein pump light and input signal light are supplied to a non-linear optical medium to generate output signal light and phase conjugate light within the non-linear optical medium. The output signal light and the phase conjugate light are extracted by a signal light/phase conjugate light extraction unit and outputted from respective output ports.
Claims52
A phase conjugate light generation apparatus, comprising:
- a non-linear optical medium;
- a pump light source for outputting pump light;
- signal light/pump light supply means connected to a signal light input port, for supplying input signal light supplied to the signal light input port to said non-linear optical medium together with the pump light from said 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 said 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;
- wherein said signal light/pump light supply means comprises an optical coupler having first to third ports connected to said signal light input port, said pump light source and a first end of said non-linear optical medium, respectively, for outputting light supplied to said first and second ports from said third port thereof.
3 more elements
A phase conjugate light generation apparatus comprising:
- a non-linear optical medium;
- a pump light source for outputting pump light;
- signal light/pump light supply means connected to a signal light input port, for supplying input signal light supplied to the signal light input port to said non-linear optical medium together with the pump light from said 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 said 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;
- wherein said non-linear optical medium generates the phase conjugate light by four-light wave mixture of a one-directional pumping type;
- and
- said signal light/phase conjugate light extraction means comprising
- an optical divider having first to third ports and connected at said first port thereof to a second end of said non-linear optical medium for splitting light supplied to said first port into two beams of light and outputting the two beams of light from said second and third ports thereof,
- a first optical filter interposed in an optical path between said second port of said optical divider and said signal light output port and having a pass band which includes a frequency of the output signal light, and
- a second optical filter interposed in an optical path between said third port of said optical divider and said phase conjugate light output port and having a pass band which includes a frequency of the phase conjugate light.
8 more elements
A phase conjugate light generation apparatus, comprising:
- a non-linear optical medium;
- a pump light source for outputting pump light;
- signal light/pump light supply means connected to a signal light input port, for supplying input signal light supplied to the signal light input port to said non-linear optical medium together with the pump light from said 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 said 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;
- said pump light source comprising first and second pump light sources for outputting beams of pump light having equal frequencies to each other;
- and
- said signal light/pump light supply means comprising
- a first optical coupler having first to third ports and connected at said second port thereof to said first pump light source and at said third port thereof to a first end of said pump light source, for outputting light supplied to said first and second ports from said third port thereof and for outputting light supplied to said third port from said first port thereof, and
- a second optical coupler having first to third ports and connected at said first port thereof to a second end of said non-linear optical medium and at said second port thereof to said second pump light source, for outputting light supplied to said first port from said third port thereof and for outputting light supplied to said second port from said first port thereof.
7 more elements
A phase conjugate light generation apparatus, comprising:
- a non-linear optical medium;
- a pump light source for outputting pump light;
- signal light/pump light supply means connected to a signal light input port, for supplying input signal light supplied to the signal light input port to said non-linear optical medium together with the pump light from said pump light source;
- 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 said 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;
- and
- modulation means for modulating the pump light in accordance with input data, wherein said modulation means modulates a frequency of the pump light.
3 more elements
A repeater optical transmission system, comprising:
- a sending station;
- a receiving station;
- an optical transmission line laid between said sending station and said receiving station;
- and
- at least one repeating station interposed intermediately of said optical transmission line;
- said at least one repeating station including a phase conjugate light generation apparatus, wherein said phase conjugate light generation apparatus comprises
- a non-linear optical medium,
- a pump light source for outputting pump light,
- signal light/pump light supply means connected to a signal light input port, for supplying input signal light supplied to the signal light input port to said non-linear optical medium together with the pump light from said pump light source,
- 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 said 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, and
- said phase conjugate light generation apparatus receiving light supplied thereto from the side of said sending station as the input signal light and sending out the phase conjugate light toward the side of said receiving station.
8 more elements
A bi-directional repeater optical transmission system, comprising:
- a first sending/receiving station having a first optical transmitter and a first optical receiver;
- a second sending/receiving station having a second optical transmitter and a second optical receiver;
- ascending and descending optical transmission lines laid between said first and second sending/receiving stations;
- at least one repeating station interposed intermediately of said ascending and descending optical transmission lines;
- said at least one repeating station comprising a phase conjugate light generation apparatus, wherein said phase conjugate light generation apparatus comprises
- a non-linear optical medium,
- a pump light source for outputting pump light,
- signal light/pump light supply means connected to a signal light input port, for supplying input signal light supplied to the signal light input port to said non-linear optical medium together with the pump light from said 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 said 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,
- said pump light source of said phase conjugate light generation apparatus comprising first and second pump light sources for outputting first pump light and second pump light, respectively,
- said phase conjugate light output port of said phase conjugate light generation apparatus comprising first and second phase conjugate light output ports,
- said phase conjugate light generation apparatus receiving light supplied to said signal light input port thereof from the side of said first sending/receiving station as first signal light, generating first phase conjugate light in accordance with the first signal light and the first pump light, sending out the first phase conjugate light from said first phase conjugate light output port thereof toward the side of said second sending/receiving station, receiving light supplied to said signal light output port thereof from the side of said second sending/receiving station as second signal light, generating second phase conjugate light in accordance with the second signal light and the second pump light, and sending out the second phase conjugate light from said second phase conjugate light output port thereof toward the side of said first sending/receiving station.
9 more elements
An optical distribution system, comprising:
- a plurality of phase conjugate light generation apparatuses, each comprising:
- a non-linear optical medium;
- a pump light source for outputting pump light;
- signal light/pump light supply means connected to a signal light input port, for supplying input signal light supplied to the signal light input port to said non-linear optical medium together with the pump light from said 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 said 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;
- said signal light output port and said phase conjugate light output port of an upper order one of each pair of adjacent ones of said plurality of phase conjugate light generation apparatuses being connected to said signal light input port of a lower order one phase conjugate light generation apparatus of the pair.
4 more elements
An optical switching system, comprising:
- a phase conjugate light generation apparatus comprising
- a non-linear optical medium,
- a pump light source for outputting pump light,
- signal light/pump light supply means connected to a signal light input port, for supplying input signal light supplied to the signal light input port to said non-linear optical medium together with the pump light from said pump light source,
- 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 said 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;
- switching means for switching said pump light source of said phase conjugate light generation apparatus on and off;
- wherein said optical switching system switches, in response to operation of said switching means, between a condition wherein the phase conjugate light is generated and another condition wherein the phase conjugate light is not generated.
4 more elements
An optical channel selection system, comprising:
- a phase conjugate light generation apparatus comprising
- a non-linear optical medium,
- a pump light source for outputting pump light,
- signal light/pump light supply means connected to a signal light input port, for supplying input signal light supplied to the signal light input port to said non-linear optical medium together with the pump light from said 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 said 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;
- sweeping means for sweeping a frequency of the pump light of said phase conjugate light generation apparatus;
- a plurality of kinds of frequency division multiplexed signal light being supplied to said signal light input port of said phase conjugate light generation apparatus;
- and
- phase conjugate light corresponding to signal light alternatively selected from the plurality of kinds of signal light being generated in response to operation of said sweeping means.
6 more elements
An optical AND circuit system, comprising:
- a phase conjugate light generation apparatus, comprising
- a non-linear optical medium,
- a pump light source for outputting pump light,
- signal light/pump light supply means connected to a signal light input port, for supplying input signal light supplied to the signal light input port to said non-linear optical medium together with the pump light from said 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 said 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;
- said pump light source comprising first and second pump light sources for outputting beams of pump light having equal frequencies to each other;
- said signal light/pump light supply means comprising
- a first optical coupler having first to third ports and connected at said second port thereof to said first pump light source and at said third port thereof to a first end of said pump light source, for outputting light supplied to said first and second ports from said third port thereof and for outputting light supplied to said third port from said first port thereof, and
- a second optical coupler having first to third ports and connected at said first port thereof to a second end of said non-linear optical medium and at said second port thereof to said second pump light source for outputting light supplied to said first port from said third port thereof and for outputting light supplied to said second port from said first port thereof;
- and
- pump light control means for varying the light emission intensities of said first and second pump light sources of said phase conjugate light generation apparatus in accordance with high and low levels of first and second input logic data, respectively;
- the phase conjugate light being generated when both of the first and second input logic data have the high level.
9 more elements
An optical communications system, comprising:
- a master station having phase conjugate light generation means and first modulation means;
- a slave station having probe light generation means and first demodulation means;
- and
- an optical transmission line provided between said master station and said slave station;
- said probe light generation means supplying probe light to a first end of said optical transmission line;
- said phase conjugate light generation means generating phase conjugate light from the probe light outputted from a second end of said optical transmission line and supplying the phase conjugate light to the second end of said optical transmission line;
- said first modulation means modulating the phase conjugate light in accordance with first input data;
- said first demodulation means demodulating the first input data in accordance with the phase conjugate light outputted from the first end of said optical transmission line.
5 more elements
An optical modulator, comprising:
- a probe light source;
- a pump light source;
- a non-linear optical medium;
- probe light/pump light supply means for supplying probe light from said probe light source to said non-linear optical medium together with pump light from said pump light source;
- and
- modulation means operatively connected to said pump light source for modulating a frequency of the pump light;
- said non-linear optical medium outputting modulated phase conjugate light.
4 more elements
An optical modulator, comprising:
- a probe light source;
- a pump light source;
- a non-linear optical medium;
- probe light/pump light supply means for supplying probe light from said probe light source to said non-linear optical medium together with pump light from said pump light source;
- and
- modulation means operatively connected to said pump light source for modulating a phase of the pump light;
- said non-linear optical medium outputting modulated phase conjugate light.
4 more elements
An optical modulator, comprising
- a probe light source;
- a pump light source;
- a non-linear optical medium;
- probe light/pump light supply means for supplying probe light from said probe light source to said non-linear optical medium together with pump light from said pump light source;
- modulation means operatively connected to said pump light source for modulating the pump light in accordance with an information signal;
- said non-linear optical medium outputting modulated phase conjugate light;
- and
- an optical band pass filter operatively connected to said non-linear optical medium and having a pass band which includes a wavelength of the phase conjugate light.
5 more elements
An optical modulator, comprising:
- a probe light source;
- a pump light source;
- a non-linear optical medium;
- probe light/pump light supply means for supplying probe light from said probe light source to said non-linear optical medium together with pump light from said pump light source;
- and
- modulation means operatively connected to said pump light source for modulating the pump light in accordance with an information signal;
- said non-linear optical medium outputting modulated phase conjugate light, wherein said non-linear optical medium comprises an optical fiber.
4 more elements
An optical modulator, comprising:
- a probe light source;
- a pump light source;
- a non-linear optical medium;
- probe light/pump light supply means for supplying probe light from said probe light source to said non-linear optical medium together with pump light from said pump light source;
- and
- modulation means operatively connected to said pump light source for modulating the pump light in accordance with an information signal;
- said non-linear optical medium outputting modulated phase conjugate light;
- wherein the pump light is modulated by frequency modulation in accordance with a signal having a sufficiently lower speed than the information signal.
5 more elements
An optical modulator, comprising:
- a probe light source;
- a pump light source;
- a non-linear optical medium;
- probe light/pump light supply means for supplying probe light from said probe light source to said non-linear optical medium together with pump light from said pump light source;
- modulation means operatively connected to said pump light source for modulating the pump light in accordance with an information signal;
- said non-linear optical medium outputting modulated phase conjugate light;
- polarization splitting means for splitting the probe light into first and second polarized light components having polarization planes perpendicular to each other;
- and
- polarization composition means;
- said non-linear optical medium receiving the first and second polarized light components of the probe light and outputting phase conjugate light corresponding to the first and second polarized light components so that the phase conjugate light is generated by said polarization composition means.
7 more elements
An optical modulator, comprising:
- a probe light source;
- a pump light source;
- a non-linear optical medium;
- probe light/pump light supply means for supplying probe light from said probe light source to said non-linear optical medium together with pump light from said pump light source;
- and
- modulation means operatively connected to said pump light source for modulating the pump light in accordance with an information signal;
- said non-linear optical medium comprising a polarization holding fiber and outputting modulated phase conjugate light;
- the pump light being substantially linearly polarized light having a predetermined polarization plane;
- and
- said pump light source being set so that the predetermined polarization plane is inclined approximately by 45.degree. with respect to the main axis of said polarization holding fiber.
7 more elements
An optical modulator, comprising:
- a probe light source;
- a pump light source;
- a non-linear optical medium;
- probe light/pump light supply means for supplying probe light from said probe light source to said non-linear optical medium together with pump light from said pump light source;
- and
- modulation means operatively connected to said pump light source for modulating the pump light in accordance with an information signal;
- said non-linear optical medium outputting modulated phase conjugate light and comprises first and second polarization holding fibers of substantially equal lengths, said first and second polarization holding fibers being connected to each other such that the main axes thereof are perpendicular to each other;
- the pump light being substantially linearly polarized light having a predetermined polarization plane;
- the pump light being supplied to said first polarization holding fiber;
- and
- said pump light source being set so that the predetermined polarization plane is inclined approximately by 45.degree. with respect to the main axis of said first polarization holding fiber.
8 more elements
Dependencies are inferred from the claim text.