Opto-electronic distributed crossbar switch

• US 6,597,824 B2
• Filed: 01/28/2001
• Issued: 07/22/2003
• Est. Priority Date: 01/28/2001
• Status: Expired due to Fees

• Current Assignee: Raytheon Company (Rtx Corporation)
• Original Assignee: Raytheon Company (Rtx Corporation)
• Inventors: Newberg, Irwin L., Mellema, Dwight J.
• Primary Examiner(s): Dang, Hung Xuan
• Assistant Examiner(s): Abutayeh, Mohammad
• Application Number:
  US09/772,318
• Publication Number:
  US 20020102046A1
• Time in Patent Office: 905 Days
• Field of Search: 385/13, 385/16-18, 385/24, 359/113, 359/124, 359/128, 359/138, 359/139
• US Class Current: 385/16
• CPC Class Codes: G02B 6/4214 the intermediate optical element having redirecting reflective means, e.g. mirrors, prisms for deflecting the radiation from horizontal to down- or upward direction toward a device G02B6/4246 takes precedence
• CPC Class Codes: G02B 6/43 Arrangements comprising a plurality of opto-electronic elements and associated optical interconnections
• CPC Class Codes: H04Q 11/0005 Switch and router aspects
• CPC Class Codes: H04Q 2011/0016 using wavelength multiplexing or demultiplexing
• CPC Class Codes: H04Q 2011/0032 using static wavelength routers (e.g. arrayed waveguide grating router [AWGR] )
• CPC Class Codes: H04Q 2011/0058 Crossbar; Matrix

Abstract

The invention is an optoelectronic (OE) crossbar switch (10) for both digital and analog signals, used either separately or combined, whose functions are reconfigurable and distributed. The invention allows multiple senders to be connected with multiple receivers simultaneously. The invention uses optical filters for wavelength division multiplexing and demultiplexing (WDM and WDD). A single fiber module input/output port carries multiple bi-directional signals that are optically filtered out in the module using WDM/WDD filters (12) at each sender/receiver and then selected after optical filtering using photodiode detectors (15) as detectors and switches. Laser transmitters (14), photodiode detectors (15), and smart electronics (18) are used to implement the crossbar switch functions. In addition to optical filters, the use of time division multiplexing (TDM) and code division multiple access (CDMA) implemented either electrically or optically are taught to increase the number of independent users that the distributed switch handles. The switch can be cascaded with other switches using optical bridging circuits (100) to create a scaleable interconnect fabric. An arbitration technique can be used which allows signals to be sent only when the intended receiver is capable of accepting these signals.

Claims

1. A module comprising:

first filter means for providing a single input/output port for the module;

transmitter means, including an optical transmitter, for launching a signal through the first filter means and the port in a first direction;

second filter means for receiving signals from the port and the first filter means in a second direction, the second direct on being opposite from the first direction;

plural receiving means including plural optical receivers, connected to the second filter means for received the signals received from the port; and

means for arbitrating between the plural receivers and the transmitter;

wherein the first and second filter means include first and second optical filters, respectively.

2. The invent on of claim 1 wherein the means for arbitrating including an electronic arrangement.

3. The invention of claim 1 further including an optical connector connected to the first filter means.

4. The invention of claim 1 further including means for arbitrating between the transmitter means and the second filter means.

5. The invention of claim 1 wherein the transmitter includes a laser.

6. The invention claim 1 wherein the laser is a tunable laser.

7. The invention of claim 1 further including a wavelength selective filter.

8. The invention of claim 1 further including means for modulating a wavelength of a signal output by the transmitter.

9. A switch module comprising:

an input/output port;

a first optical filter coupled to the input/output port;

an optical transmitter coupled to the first filter;

a second optical filter coupled to the first filter;

plural receivers connected to the second optical filter; and

an arbitration circuit connected to the plural receivers and the transmitter.

10. A crossbar switch comprising:

a plurality of modules, each module having a single input/output port;

means for connecting each of the modules wherein each of the modules includes;

a first optical filter coupled to the input/output port,

an optical transmitter coupled to the first filter, and

a second optical filter coupled to the first filter,

wherein each of the modules further includes plural receivers connected to the second optical filter and each of the modules further includes plural receivers connected to the plural receivers and the transmitter.

11. The invention of claim 10 wherein the means for connecting each of the modules includes a backplane.

12. The invention of claim 11 wherein the backplane includes n input/output ports adapted to communicate with the ports of the modules.

13. The invention of claim 12 wherein the backplane further includes n first filters, each first filter being coupled to a respective one of the ports.

14. The invention of claim 13 wherein the backplane further includes n coupling elements.

15. The invention of claim 14 wherein the coupling elements are second filters.

16. The invention of claim 15 wherein an output of each of the n first filters is connected to a respective one of the n coupling elements.

17. The invention of claim 16 wherein the backplane further includes n splitters, each splitter being coupled to an input of a respective one of the n first filters on one end and to a unique set of n coupling elements on another end thereof, the unique set of coupling elements including all of the n coupling elements except the respective one of the coupling elements to which each the corresponding first filter is output coupled.

18. The invention of claim 11 wherein the backplane consists of a single optical fiber.

19. The invention of claim 10 wherein the means for connecting includes a matrix of optical fibers.

20. A crossbar switch comprising:

a plurality of modules, each module having a single input/output port; and

means for connecting each of the modules, wherein said means includes a lens disposed on each of the modules.

21. The invention of claim 20 wherein each of the modules includes:

a first optical filter coupled to the input/output port;

an optical transmitter coupled to the first filter; and

a second optical filter coupled to the first filter.

22. The invention of claim 21 wherein each of the modules further includes plural receivers connected to the second optical filter.

23. The invention of claim 21 wherein each of the modules further includes an arbitration circuit connected to the plural receivers and the transmitter.

24. The invention of claim 20 wherein the means for connecting each of the modules includes a backplane.

25. The invention of claim 24 wherein the backplane includes n input/output ports adapted to communicate with the ports of the modules.

26. The invention of claim 25 wherein the backplane further includes n first filters, each first filter being coupled to a respective one of the ports.

27. The invention of claim 26 wherein the backplane further includes n coupling elements.

28. The invention of claim 27 wherein the coupling elements are second filters.

29. The invention of claim 28 wherein an output of each of the n first filters is connected to a respective one of the n coupling elements.

30. The invention of claim 29 wherein the backplane further includes n splitters, each splitter being coupled to an input of a respective one of the n first filters on one end and to a unique set of n coupling elements on a ther end thereof, the unique set of coupling elements including all of the n coupling elements except the respective one of the coupling elements to which each of the corresponding first filter is output coupled.

31. The invention of claim 24 wherein the backplane consists of a single optical fiber.

32. The invention of claim 20 wherein the means for connecting includes a matrix of optical fibers.

57. The invention of claim 28 wherein the backplane consists of a single optical fiber.

33. A crossbar switch comprising:

a plurality of modules, each module having a single input/output port; and

means for connecting each of the modules, wherein said means includes a diffusion plate.

34. The invention of claim 33 wherein each of the modules includes:

a first optical filter coupled to the input/output port;

an optical transmitter coupled to the first filter; and

a second optical filter coupled to the first filter.

35. The invention of claim 34 wherein each of the modules further includes plural receivers connected to the second optical filter.

36. The invention of claim 35 wherein each of the modules further includes an arbitration circuit connected to the plural receivers and the transmitter.

37. The invention of claim 33 wherein the means for connecting each of the modules includes a backplane.

38. The invention of claim 37 wherein the backplane includes n input/output ports adapted to communicate with the ports of the modules.

39. The invention of claim 38 wherein the backplane further includes n first filters, each first filter being coupled to a respective one of the ports.

40. The invention of claim 39 wherein the backplane further includes n coupling elements.

41. The invention of claim 40 wherein the coupling elements are second filters.

42. The invention of claim 41 wherein an output of each of the n first filters is connected to a respective one of the n coupling elements.

43. The invention of claim 42 wherein the backplane further includes n splitters, each splitter being coupled to an input of a respective on of the n first filters on one end and to a unique set of n coupling elements on another end thereof, the unique set of coupling elements including all of the n coupling elements except the respective one of the coupling elements to which each of the corresponding first filter is output coupled.

44. The invention of claim 37 wherein the backplane consists of a single optical fiber.

45. The invention of claim 33 wherein the means for connecting includes a matrix of optical fibers.

46. A crossbar switch comprising:

a plurality of modules, each module having a single input/output port; and

means of connecting each of the modules, wherein said means includes a holographic lens.

47. The invention of claim 46 wherein each of the modules includes:

a firs optical filter coupled to the input/output port;

an optical transmitter coupled to the first filter; and

a second optical filter coupled to the first filter.

48. The invention of claim 47 wherein each of the modules further includes plural receivers connected to the second optical filter.

49. The invention of claim 48 wherein each of the modules further includes an arbitration circuit connected to the plural receivers and the transmitter.

50. The invention of claim 46 wherein the means for connecting each of the modules includes a backplane.

51. The invention of claim 50 wherein the backplane includes n input/output ports adapted to communicate with the ports of the modules.

52. The invention of claim 51 wherein the backplane further includes n first filters, each first filter being coupled to a respective one of the ports.

53. The invention of claim 52 wherein the backplane further includes n coupling elements.

54. The invention of claim 53 wherein the coupling elements are second filters.

55. The invention of claim 54 wherein an output of each of the n first filters is connected to a respective one of the n coupling elements.

56. The invention of claim 55 wherein the backplane further includes n splitters, each splitter being coupled to an input of a respective one of the n first filters on one end and to a unique set of n coupling elements on other end thereof, the unique set of coupling element including all of the n coupling elements except e respective one of the coupling elements to which end of the corresponding first filter is output coupled.

58. The invention of claim 46 wherein the means for connecting includes a matrix of optical fibers.