US 5,920,588 A · Method and device for generation of phase conjugate light and wavelength conversion, and system having the device

Abstract

Methods and devices for generation of phase conjugate light and wavelength conversion, and systems each having the device. In a basic structure of the present invention, a signal light beam is first separated into first and second polarization components by a polarization beam splitter. The first and second polarization components are next converted into first and second phase conjugate light beams by a single DFB (distributed feed-back) laser diode or two DFB laser diodes. In the case that a single DFB laser diode is used, the first and second phase conjugate light beams are combined by the above-mentioned polarization beam splitter. In the case that two DFB laser diodes are used, the first and second phase conjugate light beams are combined by an another polarization beam splitter. Through the structure, it can be possible to provide a phase conjugate light generator having no polarization dependence of conversion efficiency.

Claims66

Dependent claims

A method for generation of phase conjugate light, comprising the steps of:

(a) separating a signal light beam into a first polarization component having a first polarization plane and a second polarization component having a second polarization plane perpendicular to said first polarization plane;
(b) supplying said first and second polarization components to a distributed feedback (DFB) laser diode to generate first and second phase conjugate light beams respectively corresponding to said first and second polarization components;
and
(c) combining said first and second phase conjugate light beams.

1 more element

A device for generation of phase conjugate light, comprising:

means for separating a signal light beam into a first polarization component having a first polarization plane and a second polarization component having a second polarization plane perpendicular to said first polarization plane;
and
a distributed feedback (DFB) laser diode supplied with said first and second polarization components to generate first and second phase conjugate light beams respectively corresponding to said first and second polarization components.

A system comprising:

a first optical fiber for transmitting a signal light beam;
a phase conjugate light generator for converting said signal light beam into a phase conjugate light beam;
and
a second optical fiber for transmitting said phase conjugate light beam;
said phase conjugate light generator comprising:
means for separating said signal light beam into a first polarization component having a first polarization plane and a second polarization component having a second polarization plane perpendicular to said first polarization plane;
and
a distributed feedback (DFB) laser diode supplied with said first and second polarization components to generate first and second phase conjugate light beams respectively corresponding to said first and second polarization components.

5 more elements

A system comprising:

a first optical fiber for transmitting a signal light beam;
a phase conjugate light generator for converting said signal light beam into a phase conjugate light beam;
and
a second optical fiber for transmitting said phase conjugate light beam;
said phase conjugate light generator comprising:
a distributed feedback (DFB) laser diode supplied with said signal light beam;
means for injecting a current into said DFB laser diode so that said DFB laser diode generates pump light;
and
a nonlinear optical medium optically connected to said DFB laser diode;
wherein a phase conjugate light beam is generated by four-wave mixing based on said signal light beam and said pump light in said DFB laser diode, and a power of said phase conjugate light beam is enhanced by four-wave mixing in said nonlinear optical medium.

7 more elements

A system comprising:

a first optical fiber for transmitting a signal light beam;
a phase conjugate light generator for converting said signal light beam into a phase conjugate light beam;
and
a second optical fiber for transmitting said phase conjugate light beam;
said phase conjugate light generator comprising:
a first DFB laser diode for generating first pump light having a first polarization plane;
and
a second DFB laser diode cascaded to said first DFB laser diode, for generating second pump light having a second polarization plane perpendicular to said first polarization plane;
wherein said signal light beam is composed of first and second polarization components having polarization planes respectively corresponding to said first and second polarization planes, and when said signal light beam is supplied to said first DFB laser diode, a first phase conjugate light beam having a polarization plane corresponding to said first polarization plane is generated in said first DFB laser diode by four-wave mixing based on said first polarization component and said first pump light, and said second polarization component is passed through said first DFB laser diode, whereas a second phase conjugate light beam having a polarization plane corresponding to said second polarization plane is generated in said second DFB laser diode by four-wave mixing based on said second polarization component and said second pump light, and said first phase conjugate light beam is passed through said second DFB laser diode.

6 more elements

Dependencies are inferred from the claim text.

Method and device for generation of phase conjugate light and wavelength conversion, and system having the device

Life of this patent

Method and device for generation of phase conjugate light and wavelength conversion, and system having the device

Life of this patent

Abstract

Claims66