Apparatus and method for programmable optical interconnections

• US 5,159,473 A
• Filed: 02/27/1991
• Issued: 10/27/1992
• Est. Priority Date: 02/27/1991
• Status: Expired due to Term

• Current Assignee: University of South Carolina
• Original Assignee: University of South Carolina
• Inventors: Feldman, Michael R.
• Primary Examiner(s): Hannaher, Constantine
• Assistant Examiner(s): Glick, Edward J.
• Application Number:
  US07/661,855
• Time in Patent Office: 608 Days
• Field of Search: 359/9, 359/10, 359/11, 359/15, 359/20, 359/22, 359/27, 359/34, 359/559, 359/563, 359/566, 359/569, 359/107, 359/1
• US Class Current: 359/1
• CPC Class Codes: G02B 5/32 Holograms used as optical elements
• CPC Class Codes: G02B 6/43 Arrangements comprising a plurality of opto-electronic elements and associated optical interconnections

Abstract

A programmable optical interconnection apparatus and method in which a plurality of spatial light modulators (SLM) form a plurality of spatially modulated beams from a data signal. A hologram is responsive to the spatially modulated beams for generating at least two destructively interfering coherent beams at a first optical detector to thereby disconnect the data signal therefrom, and for simultaneously generating at least two constructively interfering coherent beams at a second optical detector to thereby connect the data signal beam thereto. The hologram is preferably a computer generated thin hologram which does not rely on Bragg diffraction. A low cost, high density, high efficiency programmable optical interconnect is thereby provided.

Claims

1. An optical interconnection apparatus, comprising:

a first optical beam generator, for generating a first optical beam;

a plurality of optical detectors;

a plurality of spatial light modulators, responsive to said first optical beam, for forming a first plurality of spatially modulated beams therefrom; and

holographic means, responsive to said first plurality of spatially modulated beams, for generating destructively interfering beams at a first one of said optical detectors to thereby disconnect said first optical beam therefrom, and for simultaneously generating constructively interfering beams at a second one of said optical detectors to thereby connect said first optical beam thereto.

2. The apparatus of claim 1 wherein said holographic means comprises a thin hologram.

3. The apparatus of claim 2 wherein said thin hologram comprises a computer generated thin hologram.

4. The apparatus of claim 3 wherein said computer generated thin hologram comprises a faceted computer generated thin hologram.

5. The apparatus of claim 1 wherein each of said plurality of spatial light modulators comprise binary phase spatial light modulators.

6. The apparatus of claim 1 further comprising electronic controlling means, operatively connected to said plurality of spatial light modulators, for causing said spatial light modulators to generate predetermined patterns of said first plurality of spatially modulated beams, said holographic means being responsive to a first predetermined pattern of said first plurality of spatially modulated beams to disconnect said first optical beam from said first optical detector and to connect said first optical beam to said second optical detector.

7. The apparatus of claim 1 wherein each of said plurality of spatial light modulators comprise transmissive spatial light modulators.

8. The apparatus of claim 1 wherein each of said plurality of spatial light modulators comprise reflective spatial light modulators, said holographic means and said reflective spatial light modulators cooperating to form said first plurality of spatially modulated beams.

9. The apparatus of claim 1 wherein said holographic means generates one of constructively interfering beams and destructively interfering beams at each of said plurality of optical detectors.

10. The apparatus of claim 1 further comprising a second optical beam generator for generating a second optical beam, said plurality of spatial light modulators forming a second plurality of spatially modulated beams from said second optical beam, said holographic means being responsive to said second plurality of spatially modulated beams independent of said first plurality of spatially modulated beams, for generating destructively interfering beams at said second one of said optical detectors to thereby disconnect said second optical beam therefrom, and for simultaneously generating constructively interfering beams at said first one of said optical detectors, to thereby connect said second optical beam thereto.

11. The apparatus of claim 1 wherein said first optical beam generator generates a first optical beam having a first data signal impressed thereon.

12. The apparatus of claim 1 wherein said plurality of spatial light modulators impress a first data signal on each of said first plurality of spatially modulated beams.

13. Apparatus for optically connecting a first signal to a plurality of receiving nodes comprising:

means for converting said first signal into a first plurality of optical beams, each having said first signal encoded thereon; and

means, responsive to said first plurality of optical beams, for generating at least two destructively interfering coherent optical beams at a first receiving node to thereby disconnect said first signal therefrom, and for simultaneously generating at least two constructively interfering coherent beams at a second receiving node to thereby connect said first signal thereto.

14. The apparatus of claim 13 wherein said generating means comprises holographic generating means.

15. The apparatus of claim 14 wherein said holographic generating means comprises a computer generated thin hologram.

16. The apparatus of claim 13 wherein said converting means comprises means for converting said first signal into a first plurality of spatially separated, spatially coherent optical beams.

17. The apparatus of claim 13 further comprising electronic controlling means, operatively connected to said converting means, for causing said converting means to generate predetermined patterns of said first plurality of optical beams, said generating means being responsive to a first predetermined pattern of said first plurality of optical beams to disconnect said first signal from said first receiving node and to connect said first signal to said second receiving node.

18. The apparatus of claim 13 wherein said generating means generates one of constructively interfering beams and destructively interfering beams at each of said plurality of receiving nodes.

19. The apparatus of claim 13 adapted for connecting a second signal to said plurality of receiving nodes, said converting means converting said second signal into a second plurality of optical beams, said generating means being responsive to said second plurality of optical beams independent of said first plurality of optical beams, for generating at least two destructively interfering beams at said second receiving node to thereby disconnect said second signal therefrom, and for simultaneously generating at least two constructively interfering beams at said first receiving node, to thereby connect said second signal thereto.

20. The apparatus of claim 13 wherein said first signal comprises a first optical beam having a first data signal impressed thereon.

21. The apparatus of claim 13 wherein said first signal comprises a first optical beam for reading an optical storage media, and wherein said plurality of receiving nodes comprise a plurality of scan lines on said optical storage media.

22. A method for optically connecting a first signal to a plurality of receiving nodes comprising the steps of:

converting said first signal into a first plurality of coherent optical beams, each having said first signal encoded thereon; and

simultaneously generating, from said first plurality of coherent optical beams, at least two destructively interfering coherent beams at a first receiving node to thereby disconnect said first signal therefrom, and at least two constructively interfering coherent beams at a second receiving node to thereby connect said first signal thereto.

23. The method of claim 22 wherein said generating step comprises the step of passing said first plurality of coherent optical beams through a hologram.

24. The method of claim 22 wherein said generating step generates one of constructively interfering beams and destructively interfering beams at each of said plurality of receiving nodes.

25. The method of claim 22 adapted for connecting a second signal to said plurality of receiving nodes, and further comprising the steps of converting said second signal into a second plurality of coherent optical beams, said generating step further comprising the step of generating at least two destructively interfering beams at said second receiving node to thereby disconnect said second signal therefrom, and for simultaneously generating at least two constructively interfering beams at said first receiving node, to thereby connect said second signal thereto.

26. Apparatus for optically connecting a first signal to a plurality of optical detectors, comprising;

a plurality of spatial light modulators, each responsive to said first signal, for simultaneously forming a first plurality of spatially modulated light beams emerging therefrom, with each of said first plurality of spatially modulated light beams emerging therefrom having said first signal encoded thereon; and

a thin hologram, positioned relative to said plurality of spatial light modulators such that said first plurality of spatially modulated light beams emerging therefrom impinge upon said thin hologram, said thin hologram being simultaneously responsive to each of said first plurality of spatially modulated light beams impinging thereon, for generating a first optical signal having said first signal encoded thereon, and for impinging said first optical signal on at least a first one of said optical detectors, with at least a second one of said optical detectors being free of said first optical signal.

27. The apparatus of claim 26 wherein each of said plurality of spatial light modulators comprise binary phase spatial light modulators.

28. The apparatus of claim 26 further comprising electronic controlling means, operatively connected to said plurality of spatial light modulators, for causing said spatial light modulators to generate predetermined patterns of said first plurality of spatially modulated beams, said thin hologram being responsive to a first predetermined pattern of said first plurality of spatially modulated beams to impinge said first optical signal on said at least a first one of said optical detectors, with at least said second one of said optical detectors being free of said first optical signal.

29. The apparatus of claim 26 wherein each of said plurality of spatial light modulators comprise transmissive spatial light modulators.

30. The apparatus of claim 26 wherein each of said plurality of spatial light modulators comprise reflective spatial light modulators, said thin hologram and said reflective spatial light modulators cooperating to form said first plurality of spatially modulated beams.

31. The apparatus of claim 26 adapted for optically connecting a second signal to said plurality of optical detectors, said plurality of spatial light modulators simultaneously forming a second plurality of spatially modulated beams from said second signal, with each of said second plurality of spatially modulated light beams incorporating said second signal, said thin hologram being responsive to said second plurality of spatially modulated beams independent of said first plurality of spatially modulated beams, for generating a second optical signal therefrom, incorporating said second signal, and for impinging said second optical signal on at least said second one of said optical detectors, with at least said first one of said optical detectors being free of said second optical signal.

32. The apparatus of claim 26 wherein said first signal comprises a first optical beam having said first signal impressed thereon.

33. The apparatus of claim 26 wherein said plurality of spatial light modulators further impress said first signal on each of said first plurality of spatially modulated light beams.

34. Apparatus for optically connecting a plurality of optical signals to a plurality of optical detectors, comprising:

an array of spatial light modulators, a respective at least two of which are positioned in the optical path of a respective one of said plurality of optical signals, for forming therefrom a predetermined wavefront; and

a thin hologram, positioned at the predetermined wavefront of each of said at least two spatial light modulators, said thin hologram connecting the associated optical signal to a predetermined optical detector in response to said predetermined wavefront from the associated at least two spatial light modulators.

35. The apparatus of claim 34 wherein said array of spatial light modulators comprise binary phase spatial light modulators.

36. The apparatus of claim 34 further comprising electronic controlling means, operatively connected to said array of spatial light modulators, for causing said spatial light modulators to generate predetermined patterns of said predetermined wavefront, to thereby connect said associated optical signal to said predetermined optical detector.

37. The apparatus of claim 34 wherein said array of spatial light modulators comprise reflective spatial light modulators, said thin hologram and said reflective spatial light modulators cooperating to form said predetermined wavefronts.