Fiber optic switching system

• US 5,440,654 A
• Filed: 12/30/1993
• Issued: 08/08/1995
• Est. Priority Date: 12/30/1993
• Status: Expired due to Term

• Current Assignee: OL Security LLC (Intellectual Ventures LLC)
• Original Assignee: Raytheon Company (Rtx Corporation)
• Inventors: Lambert, Jr., L. Q.
• Primary Examiner(s): Lee, John D.
• Application Number:
  US08/175,994
• Time in Patent Office: 586 Days
• Field of Search: 385/16, 385/17, 385/20, 385/21, 385/22, 385/24, 250/227.24, 250/227.25, 250/573-575, 250/578.1, 359/38, 359/39, 359/42, 359/54-58
• US Class Current: 385/17
• CPC Class Codes: G02F 1/29 for the control of the position or the direction of light beams, i.e. deflection

Abstract

A data communication system comprising a plurality of fiber optic cables and a fiber optic switching system, comprising: a support structure for securing light emitting/light receiving ends of the plurality of fiber optic cables in predetermined positions; and, means for re-directing light emitted from the light emitting/light receiving end of one of the fiber optic cables to the light emitting/light receiving end to the light emitting/light receiving end of another one of the plurality of fiber optic cables. The re-directing means includes means for collimating and directing the light emitted from the end of one of the cables as a beam propagating along a predetermined direction and for re-directing the beam towards the end of another one of the cables selectively in accordance with an electrical signal. More particularly, the re-directing means includes electro-optical phase shifting medium, preferably liquid crystal molecules.

Claims

1. A fiber optic switching system, comprising:

a plurality of fiber optic cables;

a support structure for securing light emitting/light receiving ends of the plurality of fiber optic cables in predetermined positions; and

means for re-directing light emitted from the light emitting/light receiving end of one of the fiber optic cables to the light emitting/light receiving end of another one of the plurality of fiber optic cables;

said redirecting means comprising;

means for collimating the light emitted from one of the light emitting/light receiving ends for providing a collimated beam having a path with a direction;

first means for intercepting and changing the direction of the path of the collimated beam;

second means, disposed in the path of the collimated beam from the first intercepting and changing means, for intercepting and changing the direction of the path of the collimated beam; and

means, disposed in the path of the collimated beam from the second intercepting and changing means, for focusing the collimated beam to the light emitting/light receiving end of another one of the plurality of fiber optic cables.

2. The system recited in claim 1 wherein the collimating means comprises a collimating lens.

3. The system recited in claim 2 wherein the first and second intercepting and changing means each comprises an optical beam phase shifter.

4. The system recited in claim 3 wherein the optical beam phase shifter comprises liquid crystal molecules disposed between a common electrode and a multiplicity of parallel stripe electrodes.

5. A switching system, for coupling information propagating as electromagnetic wave energy between selected ones of a plurality of terminals having a predetermined spatial relationship, each one of such terminals being adapted to transmit said wave energy and receive said transmitted wave energy, said system comprising:

means, responsive to an electrical signal and positioned to receive the wave energy transmitted at one of the terminals, for changing the index of refraction of said means as said received wave energy passes through said means to direct said received energy to another one of the spaced terminals selectively in accordance with the electrical signal; and

means for collimating the wave energy emitted from an end of one of the terminals for providing a collimated beam having a path with a direction; and

said index of refraction changing means comprising;

first means for intercepting and changing the direction of the path of the collimated beam comprising an optical beam phase shifter; and

second means, disposed in the path of the collimated beam from the first intercepting and changing means, for intercepting and changing the direction of the path of the collimated beam comprising an optical beam phase shifter; and

means, disposed in the path of the collimated beam from the second intercepting and changing means, for focusing the collimated beam to the another one of the terminals.

6. The system recited in claim 5 wherein the optical beam phase shifter comprises liquid crystal molecules disposed between a common electrode and a multiplicity of parallel stripe electrodes.

7. A system for coupling information propagating in a beam of electromagnetic wave energy between selected ones of a plurality of terminals having a predetermined spatial relationship, each one of such terminals being adapted to transmit said wave energy and receive said transmitted wave energy, said system comprising:

means, responsive to an electrical signal and positioned to intercept the beam of wave energy emanating from one of the terminals, for re-directing said intercepted beam to another one of the spaced terminals selectively in accordance with the electrical signal, said redirecting means comprising;

means for collimating the wave energy emitted from one of the terminals for providing a collimated beam having a path with a direction;

first means for intercepting and changing the direction of the path of the collimated beam;

second means, disposed in the path of the collimated beam from the first intercepting and changing means, for intercepting and changing the direction of the path of the collimated beam; and

means, disposed in the path of the collimated beam from the second intercepting and changing means, for focusing the collimated beam to another one of the terminals.

8. The system recited in claim 7 wherein the collimating means comprises a collimating lens.

9. The system recited in claim 8 wherein the first and second intercepting and changing means each comprises an optical beam phase shifter.

10. The system recited in claim 9 wherein the optical beam phase shifter comprises liquid crystal molecules disposed between a common electrode and a multiplicity of parallel stripe electrodes.

11. A method for coupling information propagating as electromagnetic wave energy between selected ones of a plurality of terminals having a predetermined spatial relationship, each one of such terminals being adapted to transmit said wave energy and receive said transmitted wave energy, said method comprising:

the step of changing the index of refraction of a medium supporting propagation of the wave energy transmitted at one of the terminals to direct said received energy to another one of the spaced terminals selectively in accordance with an electrical signal, the changing step comprising the steps of;

collimating the wave energy emitted from an end of one of the terminals for providing a collimated beam having a path with a direction;

intercepting and changing the direction of the path of the collimated beam with an optical beam phase shifter;

again intercepting and changing the direction of the path of the collimated beam with a second optical beam phase shifter; and

focusing the collimated beam to the another one of the terminals.

12. A method for coupling information propagating in a beam of electromagnetic wave energy between selected ones of a plurality of terminals having a predetermined spatial relationship, each one of such terminals being adapted to transmit said wave energy and receive said transmitted wave energy, said method comprising the steps of:

intercepting the beam of wave energy emanating from one of the terminals and re-directing said intercepted beam to another one of the spaced terminals selectively in accordance with an electrical signal, said intercepting and redirecting step comprising the steps of;

collimating the wave energy emitted from an end of one of the terminals for providing a collimated beam having a path with a direction;

intercepting and changing the direction of the path of the collimated beam with an optical beam phase shifter;

again intercepting and changing the direction of the path of the collimated beam with a second optical beam phase shifter; and

focusing the collimated beam to the another one of the terminals.