Optical tap for an optical switch

• US 6,597,825 B1
• Filed: 10/30/2001
• Issued: 07/22/2003
• Est. Priority Date: 10/30/2001
• Status: Expired due to Term

• Current Assignee: Calient Networks Incorporated
• Original Assignee: Calient Networks Incorporated
• Inventors: Zheng, Xuezhe, Yuan, Shifu
• Primary Examiner(s): Palmer, Phan T. H.
• Application Number:
  US10/016,314
• Time in Patent Office: 630 Days
• Field of Search: 385/16-24, 385/36, 385/33, 385/37
• US Class Current: 385/16
• CPC Class Codes: G02B 6/2817 using reflective elements to split or combine optical signals
• CPC Class Codes: G02B 6/3512 the optical element being reflective, e.g. mirror
• CPC Class Codes: G02B 6/3556 NxM switch, i.e. regular arrays of switches elements of matrix type constellation
• CPC Class Codes: G02B 6/3582 Housing means or package or arranging details of the switching elements, e.g. for thermal isolation

Abstract

An all-optical switch includes an array of input optical fibers and an array of output optical fibers. A rhomboidal prism beam splitter is positioned in operative relationship with the array of input fibers such that when an array of optical beams is propagated from the array of input optical fibers, the beam splitter splits the array of optical beams into a signal path and a tap path. The rhomboidal prism beam splitter includes a partial internal reflection (PIR) surface and a total internal reflection (TIR) surface. The PIR surface and the TIR surface cooperate to split the array of optical beams into the signal path and the tap path such that the signal path is substantially parallel to the tap path upon exiting the beam splitter.

Claims

1. An optical switch comprising:

an array of input optical fibers;

an array of output optical fibers;

an input lens array operatively associated with the array of input optical fibers to produce an array of approximately collimated optical beams from the array of input optical fibers;

a rhomboidal prism beam splitter mounted with respect to the input lens array to split the approximately collimated array of optical beams into a signal path and a tap path;

an array of input mirrors, each mirror being rotatable in two axes, the array of mirrors positioned such that the optical beams from the input lens array are incident on the array of mirrors and each optical beam is reflected in a selected direction associated with a controlled position of a corresponding mirror; and

an output lens array operatively associated with the array of output optical fibers to focus the optical beams reflected from the mirrors into the array of output optical fibers.

2. The optical switch of claim 1 wherein the tap path is directed to an array of sample mirrors.

3. The optical switch of claim 2 wherein the tap path includes one or more tap optical beams, each tap optical beam being reflected from a corresponding sample mirror and directed to an array of tap mirrors.

4. The optical switch of claim 3 wherein the number of tap mirrors is less than the number of sample mirrors.

5. The optical switch of claim 3 wherein the array of sample mirrors is monolithically integrated with the array of input signal mirrors.

6. The optical switch of claim 3 wherein the array of tap mirrors is monolithically integrated with the array of output signal mirrors.

7. The optical switch of claim 2 wherein the array of sample mirrors is monolithically integrated with at least one array of input signal mirrors.

8. The optical switch of claim 2 wherein the tap path includes one or more tap optical beams, each tap optical beam being reflected from a corresponding sample mirror and directed to at least one photodetector.

9. The optical switch of claim 1 further comprising an array of output mirrors and an array of folding mirrors positioned in the optical switch to reflect the array of optical beams from the array of output mirrors to the output lens array, wherein the array of input optical fibers has a longitudinal axis that is at an angle of approximately 60 to 90 degrees with respect to a longitudinal axis of the array of output optical fibers.

10. The optical switch of claim 9 wherein the angle between the longitudinal axes of the array of input optical fibers and the array of output optical fibers is approximately 70 degrees.

11. The optical switch of claim 1 wherein the array of input optical fibers are positioned within a first mechanical block and the array of output optical fibers are positioned within a second mechanical block.

12. The optical switch of claim 1 wherein the rhomboidal prism beam splitter includes a partial internal reflection (PIR) surface and a total internal reflection (TIR) surface, the PIR surface and the TIR surface cooperating to split the array of optical beams into the signal path and the tap path such that the signal path is parallel to the tap path upon exiting the beam splitter.

13. An optical switch comprising:

an array of input optical fibers;

an array of output optical fibers;

at least one array of mirrors positioned such that when an array of optical beams is propagated from the input optical fibers, the optical beams are incident on the array of mirrors and each optical beam is reflected in a selected direction associated with a controlled position of a corresponding mirror; and

a rhomboidal prism beam splitter mounted with respect to the array of input fibers to split the array of optical beams into a signal path and a tap path.

14. The optical switch of claim 13 wherein the tap path is directed to an array of sample mirrors.

15. The optical switch of claim 14 wherein the tap path includes one or more tap optical beams, each tap optical beam being reflected from a corresponding sample mirror and directed to an array of tap mirrors.

16. The optical switch of claim 15 wherein the number of tap mirrors is less than the number of sample mirrors.

17. The optical switch of claim 15 wherein the array of tap mirrors is monolithically integrated with at least one array of output signal mirrors.

18. The optical switch of claim 14 wherein the array of sample mirrors is monolithically integrated with at least one array of input signal mirrors.

19. The optical switch of claim 14 wherein the tap path includes one or more tap optical beams, each tap optical beam being reflected from a corresponding sample mirror and directed to at least one photodetector.

20. The optical switch of claim 13 further comprising an array of output mirrors and at least one folding mirror positioned in the optical switch to reflect the array of optical beams from the array of output mirrors to the array of output optical fibers, wherein the array of input optical fibers has a longitudinal axis that is at an of approximately 60 to 90 degrees with respect to a longitudinal axis of the array of output optical fibers.

21. The optical switch of claim 20 wherein the angle between the longitudinal axes of the array of input optical fibers and the array of output optical fibers is approximately 70 degrees.

22. The optical switch of claim 13 wherein the rhomboidal prism beam splitter includes a partial internal reflection (PIR) surface and a total internal reflection (TIR) surface, the PIR surface and the TIR surface cooperating to split the array of optical beams into the signal path and the tap path such that the signal path is substantially parallel to the tap path upon exiting the beam splitter.

23. The optical switch of claim 13 wherein the array of input optical fibers are positioned within a first mechanical block and the array of output optical fibers are positioned within a second mechanical block.

24. An all-optical switch comprising:

an array of input optical fibers;

an array of output optical fibers; and

a rhomboidal prism beam splitter positioned in operative relationship with the array of input fibers such that when an array of optical beams is propagated from the array of input optical fibers, the beam splitter splits the array of optical beams into a signal path and a tap path, the rhomboidal prism beam splitter including a partial internal reflection (PIR) surface and a total internal reflection (TIR) surface, the PIR surface and the TIR surface cooperating to split the array of optical beams into the signal path and the tap path such that the signal path is substantially parallel to the tap path upon exiting the beam splitter.

25. The all-optical switch of claim 24 wherein the tap path is directed to an array of sample mirrors.

26. The optical switch of claim 25 wherein the tap path includes one or more tap optical beams, each tap optical beam being reflected from a corresponding sample mirror and directed to an array of tap mirrors.

27. The optical switch of claim 26 wherein the number of tap mirrors is less than the number of sample mirrors.

28. The optical switch of claim 26 wherein the array of sample mirrors is monolithically integrated with the array of input signal mirrors.

29. The optical switch of claim 26 wherein the array of tap mirrors is monolithically integrated with the array of output signal mirrors.

30. The optical switch of claim 25 wherein the tap path includes one or more tap optical beams, each tap optical beam being reflected from a corresponding sample mirror and directed to at least one photodetector.

31. The all-optical switch of claim 25 wherein the array of sample mirrors is monolithically integrated with at least one array of input signal mirrors.

32. The optical switch of claim 24 further comprising an array of output mirrors and at least one folding mirror positioned in the optical switch to reflect the array of optical beams from the array of output mirrors to the array of output optical fibers, wherein the array of input optical fibers has a longitudinal axis that is at an angle of approximately 60 to 90 degrees with respect to a longitudinal axis of the array of output optical fibers.

33. The optical switch of claim 32 wherein the angle between the longitudinal axes of the array of input optical fibers and the array of output optical fibers is approximately 70 degrees.

34. The all-optical switch of claim 24 wherein the signal path propagates through the PIR surface and the tap path is reflected from the TIR surface.

35. The optical switch of claim 24 wherein the array of input optical fibers are positioned within a first mechanical block and the array of output optical fibers are positioned within a second mechanical block.