Optical cross-point switch

• US 4,074,142 A
• Filed: 09/10/1975
• Issued: 02/14/1978
• Est. Priority Date: 09/10/1975
• Status: Expired due to Term

• Current Assignee: Albert S. Jackson
• Original Assignee: Albert S. Jackson
• Inventors: Jackson, Albert S.
• Primary Examiner(s): Nelms, David C.
• Application Number:
  US05/612,255
• Time in Patent Office: 888 Days
• Field of Search: 250/199, 250/201, 250/208, 250/209, 250/578, 250/551, 340/173 LM, 340/173 LS, 340/173 LT, 340/365 P
• US Class Current: 250/551
• CPC Class Codes: H03K 17/78 using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled
• CPC Class Codes: H04J 14/08 Time-division multiplex systems
• CPC Class Codes: H04Q 3/526 Optical switching systems

Abstract

An optical cross-point switch is disclosed which has the capability of connecting any of a multiplicity of input signals to any of a multiplicity of output lines, in any order in a non-interfering and non-blocking manner. The cross-point switch includes n input circuits (where n is an integer greater than one) and an output circuit associated with each input circuit. An n array of light emitting diodes is connected to each input circuit for transforming input electrical signals applied to the input circuits into optical radiation. A photosensor is connected to each output circuit for transforming incident optical radiation into output electrical signals. A lens, or fiber optic, system is disposed between the light emitting diodes and the photosensors for focusing optical radiations eminating from each array of diodes onto a separate photosensor. An input and output address decoding and selection circuit is coupled to each array of light emitting diodes to selectively enable one diode of each array so that each input circuit may be electro-optically coupled to a selected output circuit.

Claims

1. In an optical cross-point switch, the combination which comprises:

a plurality of separate input circuits;

a plurality of separate output circuits;

an optical matrix connected between the input and output circuits, the matrix including a first set of light emitting units associated with the input circuits and a second set of light sensor units associaed with the output circuits, one of the first and second sets having a number of n units, where n equals an integer, and the other set having a number of arrays of units with each array having a number of n units, one unit in each array of the other set being individually associated with one unit of said one set, each unit of the first set being coupled to a separate input or output circuit and each array of the second set being coupled to a separate input or output circuit, each light emitting unit being arranged to convert an electrical signal into a light signal, each light sensor unit being arranged to convert a light signal into an electrical signal;

means for transmitting light signals between each unit of said one set and the associated unit in each array of the other set so that each input circuit may be selectively coupled to any desired output circuit; and

means for selectively enabling one unit of each array to thereby connect selected input circuits to selected output circuits.

2. The combination as defined in claim 1 wherein said one set comprises the light sensor units with one light sensor light sensor unit being coupled to each output circuit and wherein said other set comprises the light emitting units with a separate array of light emitting units being coupled to each input circuit.

3. The combination as defined in claim 1 wherein said one set comprises the light emitting units with one light emitting unit being coupled to each input circuit and wherein said other set comprises the light sensor units with a separate array of light sensor units being coupled to each output circuit.

4. The combination as defined in claim 1 wherein the means for transmitting the light signals between the light emitting and sensor units comprises fiber optic bundles.

5. The combination as defined in claim 1 wherein the means for transmitting the light signals between the light emitting and sensor units comprises a plurality of lenses.

6. The combination as defined in claim 1 wherein the light emitting units are light emitting diodes.

7. In an optical cross-point switch, the combination which comprises:

a plurality of separate input circuits;

a plurality of separate output circuits;

an optical matrix connected between the input and output circuits, the matrix including n light emitting units, where n equals an integer, and a set of arrays of light sensor units, one light emitting unit being coupled to each input circuit, one array of light sensor units being coupled to each output circuit, each array of light sensor units having n light sensor units, one light sensor unit in each array being individually associated with one light emitting unit, each light emitting unit being arranged to convert an electrical signal into a light signal, each light sensor unit being arranged to convert a light signal into an electrical signal;

means for transmitting light signals between each light emitting unit and the associated light sensor unit in each array of the other set so that each input circuit may be selectively coupled to any desired output circuit; and

means for selectively enabling at least one light sensor unit of each array to thereby connect selected input circuits to selected output circuits.

8. The combination as defined in claim 7 wherein the means for selectively enabling light sensor units comprises a binary address decoding and selection circuit.

9. The combination as defined in claim 7 wherein the means or transmitting light signals between the light emitting and sensor units comprises fiber optic bundles.

10. The combination as defined in claim 7 wherein the means for transmitting light signals between the light emitting and sensor units comprises a plurality of lenses.

11. The combination as defined in claim 10 wherein the plurality of lenses includes a separate relay lens for each array of light sensor units and an objective lens.

12. The combination as defined in claim 7 wherein the light emitting units are light emitting diodes.

13. The combination as defined in claim 7 wherein n equals the number of input and output circuits.

14. In an optical cross-point switch, the combination which comprises:

a plurality of separate input circuits;

a plurality of separate output circuits;

an optical matrix connected between the input and output circuits, the matrix included n arrays of light emitting units and n light sensor units, where n equals an integer, one array of light emitting units being connected to each input circuit, one light sensor unit being connected to each output circuit, each light emitting unit being arranged to convert an electrical signal applied to the associated input circuit into a light signal, each light sensor unit being arranged to convert a light signal incident thereon into an electrical signal;

one unit in each array of light emitting units being associated with one light sensor unit whereby each of said light sensor units will be illuminated with light from said associated light emitting unit;

means for transmitting light signals between each light emitting unit in each array of light emitting units and the associated light sensor unit; and

means for selectively enabling at least one light emitting unit of each array to thereby connect selected input circuits to selected output circuits.

15. The combination as defined in claim 14 wherein the means for selectively enabling light sensor units comprises a binary address decoding and selection circuit.

16. The combination as defined in claim 14 wherein the means for transmitting light signals between the light emitting and sensor units comprises fiber optic bundles.

17. The combination as defined in claim 14 wherein the means for transmitting light signals between the light emitting and sensor units comprises a plurality of lenses.

18. The combination as defined in claim 17 wherein the plurality of lenses includes a separate relay lens for each array of light sensor units and an objective lens.

19. The combination as defined in claim 14 wherein the light emitting units are light emitting diodes.

20. The combination as defined in claim 14 wherein n equals the number of input and output circuits.