Micromirror optical switch

• US 6,633,694 B2
• Filed: 09/28/2001
• Issued: 10/14/2003
• Est. Priority Date: 09/29/2000
• Status: Expired due to Term

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Tew, Claude E.
• Primary Examiner(s): Zarroli, Michael C.
• Application Number:
  US09/966,399
• Publication Number:
  US 20020076138A1
• Time in Patent Office: 746 Days
• Field of Search: 385/17, 385/18, 385/15, 359/838, 359/83.9, 359/196, 359/212, 359/221, 359/223
• US Class Current: 385/18
• CPC Class Codes: G02B 6/3512 the optical element being reflective, e.g. mirror
• CPC Class Codes: G02B 6/3516 the reflective optical element moving along the beam path, e.g. controllable diffractive effects using multiple micromirrors within the beam
• CPC Class Codes: G02B 6/3556 NxM switch, i.e. regular arrays of switches elements of matrix type constellation
• CPC Class Codes: G02B 6/357 Electrostatic force electrostatic forces controlling reflecting elements in general G02B26/0841
• CPC Class Codes: Y10S 359/904 Micromirror

Abstract

A family of optical switches. Each switch (400) includes a holder block (402) to hold optical fibers (410, 412) and ferrules (414) in alignment with a micromirror array (406). The holder block 402 has a reflective bottom surface (404). The bottom surface (404) functions as a retro-reflector when the optical switch (400) is assembled. The micromirror array (406) has a substrate on which rows of micromirrors have been fabricated. The ferrules (414) are held at an angle relative to the micromirror array (406). This angle allows the light emitted from the input fiber (410) to traverse the array of micromirrors (406) to the output fiber (412). Light from the input fiber (410) is reflected between a series of mirrors (408) and the retro-reflective surface (404) until reaching the output fiber (412). The rotation of the mirrors determines the path of light across the mirror array (406) and which output fiber (412) the light reaches.

Claims

1. An optical switch comprising:

at least one input fiber, each said input fiber defining an input optical axis and having an exit end;

at least one output fiber, each said output fiber defining an output optical axis and having an entrance end;

a retro-reflective surface between said exit and entrance ends; and

a mirror array, said mirror array defining an x-y plane substantially parallel to said retro-reflective surface, said mirror array comprised of at least one mirror on each said input optical axis and said output optical axis, said mirrors on said input optical axes operable to rotate about a single axis parallel to said x-y plane to deflect light from each input fiber to at least one intermediate spot on said retro-reflector, said mirrors on said output optical axes operable to reflect light from at least one of said intermediate spots of said retro-reflector to an associated output fiber sharing said output axis.

2. The optical switch of claim 1, farther comprising a focusing element between at least one of said fibers and said mirror array.

3. The optical switch of claim 1, said focusing element selected from the group consisting of a collimating lens, a converging lens, a diverging lens, a diffractive focusing means, a refractive focusing means, and a gradient index self focusing lens.

4. The optical switch of claim 1, said mirror array comprised of an array of mirrors, each of said at least one mirror comprising a group of mirrors operating in concert to direct said light from said input fibers to said output fibers.

5. The optical switch of claim 1, further comprising a holding block holding said at least one input fiber at a non-perpendicular angle to said x-y plane.

6. The optical switch of claim 5, said retro-reflective surface comprised of the bottom surface of said holding block.

7. The optical switch of claim 5, said mirror array comprised of an array of mirrors, each of said at least one mirror comprising a group of mirrors operating in concert to direct said light from said input fibers to said output fibers.

8. The optical switch of claim 5, further comprising a focusing element between said input fiber and said mirror array.

9. The optical switch of claim 8, said focusing element selected from the group consisting of a collimating lens, a converging lens, a diverging lens, a diffractive focusing means, a refractive focusing means, and a gradient index self focusing lens.

10. The optical switch of claim 1, further comprising a holding block holding said at least one output fiber at a non-perpendicular angle to said x-y plane.

11. The optical switch of claim 10, said retro-reflective surface comprised of the bottom surface of said holding block.

12. The optical switch of claim 10, said mirror array comprised of an array of mirrors, each of said at least one mirror comprising a group of mirrors operating in concert to direct said light from said input fibers to said output fibers.

13. The optical switch of claim 10, further comprising a focusing element between said input fiber and said mirror array.

14. The optical switch of claim 13, said focusing element selected from the group consisting of a collimating lens, a converging lens, a diverging lens, a diffractive focusing means, a refractive focusing means, and a gradient index self focusing lens.

15. The optical switch of claim 1, at least one of said mirrors in said mirror array having an axis perpendicular to at least one other of said mirrors in said mirror array.

16. The optical switch of claim 15, said mirror array further comprising a holding block holding said at least one of said input and output fibers.

17. The optical switch of claim 16, said retro-reflective surface comprised of the bottom surface of said holding block.

18. The optical switch of claim 14, said mirror array comprised of an array of mirrors, each of said at least one mirror comprising a group of mirrors operating in concert to direct said light from said input fibers to said output fibers.

19. The optical switch of claim 14, further comprising a focusing element between said input fiber and said mirror array.

20. The optical switch of claim 19, said focusing element selected from the group consisting of a collimating lens, a converging lens, a diverging lens, a diffractive focusing means, a refractive focusing means, and a gradient index self focusing lens.

21. An optical switch comprising:

at least one input fiber, each said input fiber defining an input optical axis and having an exit end;

at least one output fiber, each said output fiber defining an output optical axis and having an entrance end;

a retro-reflective surface between said exit and entrance ends; and

a mirror array, said mirror array defining an x-y plane substantially parallel to said retro-reflective surface, said mirror array comprised of at least one mirror on each said input optical axis and said output optical axis and at least one intermediate mirror, said mirrors on said input optical axes operable to rotate about a single axis parallel to said x-y plane to deflect light from each input fiber to at least one intermediate spot on said retro-reflector, said mirrors on said output optical axes operable to reflect light from at least one of said intermediate spots of said retro-reflector to an associated output fiber sharing said output axis, said intermediate mirrors operable to rotate about a single axis parallel to said x-y plane to deflect light from at least one intermediate spot to at least one other intermediate spot.

22. The optical switch of claim 21, further comprising a focusing element between said input fiber and said mirror array.

23. The optical switch of claim 22, said focusing element selected from the group consisting of a collimating lens, a converging lens, a diverging lens, a diffractive focusing means, a refractive focusing means, and a gradient index self focusing lens.

24. The optical switch of claim 21, said mirror array comprised of an array of mirrors, each of said at least one mirror comprising a group of mirrors operating in concert to direct said light from said input fibers to said output fibers.

25. The optical switch of claim 21, further comprising a holding block holding said at least one input fiber at a non-perpendicular angle to said x-y plane.

26. The optical switch of claim 25, said retro-reflective surface comprised of the bottom surface of said holding block.

27. The optical switch of claim 25, said mirror array comprised of an array of mirrors, each of said at least one mirror comprising a group of mirrors operating in concert to direct said light from said input fibers to said output fibers.

28. The optical switch of claim 25, further comprising a focusing element between said input fiber and said mirror array.

29. The optical switch of claim 28, said focusing element selected from the group consisting of a collimating lens, a converging lens, a diverging lens, a diffractive focusing means, a refractive focusing means, and a gradient index self focusing lens.

30. The optical switch of claim 21, further comprising a holding block holding said at least one output fiber at a non-perpendicular angle to said x-y plane.

31. The optical switch of claim 30, said retro-reflective surface comprised of the bottom surface of said holding block.

32. The optical switch of claim 30, said mirror array comprised of an array of mirrors, each of said at least one mirror comprising a group of mirrors operating in concert to direct said light from said input fibers to said output fibers.

33. The optical switch of claim 30, further comprising a focusing element between said input fiber and said mirror array.

34. The optical switch of claim 33, said focusing element selected from the group consisting of a collimating lens, a converging lens, a diverging lens, a diffractive focusing means, a refractive focusing means, and a gradient index self focusing lens.

35. The optical switch of claim 21, at least one of said mirrors in said mirror array having an axis perpendicular to at least one other of said mirrors in said mirror array.

36. The optical switch of claim 35, said mirror array further comprising a holding block holding said at least one of said input and output fibers.

37. The optical switch of claim 36, said retro-reflective surface comprised of the bottom surface of said holding block.

38. The optical switch of claim 35, said mirror array comprised of an array of mirrors, each of said at least one mirror comprising a group of mirrors operating in concert to direct said light from said input fibers to said output fibers.

39. The optical switch of claim 35, further comprising a focusing element between said input fiber and said mirror array.

40. The optical switch of claim 39, said focusing element selected from the group consisting of a collimating lens, a converging lens, a diverging lens, a diffractive focusing means, a refractive focusing means, and a gradient index self focusing lens.