Methods and apparatuses for optical switches

• US 20020076134A1
• Filed: 12/12/2001
• Published: 06/20/2002
• Est. Priority Date: 12/15/2000
• Status: Abandoned Application

• Current Assignee: Lambda Optics, Inc.
• Original Assignee: Lambda Optics, Inc.
• Inventors: Singh, Navrit P.
• Application Number:
  US10/021,399
• Publication Number:
  US 20020076134A1
• Time in Patent Office: Days
• US Class Current: 385/16
• CPC Class Codes: G02B 6/32 having lens focusing means positioned between opposed fibre ends with lens being an integral part of the single fibre end G02B6/262
• CPC Class Codes: G02B 6/3504 Rotating, tilting or pivoting the waveguides, or with the waveguides describing a curved path rotary joint G02B6/3628
• CPC Class Codes: G02B 6/3528 the optical element being a prism
• CPC Class Codes: G02B 6/3572 Magnetic force magnetic forces controlling reflecting elements in general G02B26/085; magneto-optic devices G02F1/09
• CPC Class Codes: G02B 6/3582 Housing means or package or arranging details of the switching elements, e.g. for thermal isolation
• CPC Class Codes: G02B 6/3588 of the processed beams, i.e. controlling during switching of orientation, alignment, or beam propagation properties such as intensity, size or shape

Abstract

Optical switches and other similar optical configurations can comprise high-speed, high precision motors such as voice coil motors to carry out optical switching for applications such as optical signal based communication systems. These switches and configurations are expected to have switch time delays per channel that are significantly shorter than conventional optical switches. Some embodiments may have switch time delays that may be about a factor of 10 (or more) shorter than that for the conventional optical switch technology. Some embodiments may optimize optical coupling efficiency to increase the optical signal intensity transmission through optical switches and potential extend the useful life of the optical switches.

Claims

1. An optical switch comprising:

an optical component; and

an actuator coupled to the optical component, wherein the actuator is adapted to provide angular motion to the optical component.

2. The optical switch of claim 1, further comprising a plurality of optical receivers including a first optical receiver, wherein the actuator is configured to direct a signal from the optical component to the first optical receiver.

3. The optical switch of claim 2, further comprising a controller coupled to the actuator.

4. The optical switch of claim 3, further comprising a feedback loop, wherein:

the feedback loop includes an optoelectronic component that is adapted to receive a portion of an optical signal from the optical component and convert that portion to an electronic signal; and

the optoelectronic component is coupled to the controller.

5. The optical switch of claim 1, wherein the actuator is part of a voice coil motor.

6. The optical switch of claim 1, wherein the optical component comprises an optical fiber or an electronic laser.

7. The optical switch of claim 1, wherein the optical component comprises a mirror or a prism.

8. The optical switch of claim 1, wherein the optical component comprises a lens or a collimator.

9. An optical switch comprising:

an optical component; and

a voice coil motor coupled to the optical component, wherein the voice coil motor is adapted to move the optical component.

10. The optical switch of claim 9, further comprising a plurality of optical receivers including a first optical receiver, wherein the voice coil motor is configured to direct a signal from the optical component to the first optical receiver.

11. The optical switch of claim 10, further comprising a controller coupled to the voice coil motor.

12. The optical switch of claim 11, further comprising a feedback loop, wherein:

the feedback loop includes an optoelectronic component that is adapted to receive a portion of an optical signal from the optical component and convert that portion to an electronic signal; and

the optoelectronic component is coupled to the controller.

13. The optical switch of claim 9, wherein the optical component is configured to rotate about an axis.

14. The optical switch of claim 9, wherein the optical component comprises an optical fiber or an electronic laser.

15. The optical switch of claim 9, wherein the optical component comprises a mirror or a prism.

16. The optical switch of claim 9, wherein the optical component comprises a lens or a collimator.

17. The optical switch of claim 9, further comprising:

an array of optical receivers oriented substantially along a plane, wherein the array of optical receivers includes a first optical receiver;

a controller coupled to the voice coil motor; and

an optoelectronic component that is adapted to receive a portion of an optical signal from the optical component and convert that portion to an electronic signal,

wherein the optical component and optical receivers are optical fibers.

18. The optical switch of claim 17, further comprising:

a first fitting for holding a portion of the optical component and an optical tap, wherein the first fitting includes an antireflective film lying between the optical component and the first optical receiver; and

a second fitting for holding a portion of the first light receiver, wherein the second fitting includes a semi-reflective film lying between the antireflective film and the first optical receiver.

20. The method of claim 19, wherein increasing the optical coupling efficiency further comprises:

measuring a first light intensity at a first position;

moving an optical component in a first direction from the first position to a second position;

measuring a second light intensity at the second position; and

comparing the first and second light intensities to each other.

21. The method of claim 20, wherein:

the first intensity is greater than the second intensity; and

increasing the optical coupling efficiency further comprises moving the optical component from the second position to the first position.

22. The method of claim 20, wherein:

the first intensity is greater than the second intensity; and

increasing the optical coupling efficiency further comprises moving the optical component from the second position to a third position in a second direction opposite the first direction, wherein the first position lies between the second and third positions.

23. The method of claim 20, wherein the first intensity is equal to or less than the second intensity, and wherein the optical component remains substantially at the second position.

24. The method of claim 20, wherein:

the first intensity is equal to or less than the second intensity; and

increasing the optical coupling efficiency further comprises moving the optical component from the second position to a third position in the first direction, wherein the second position lies between the first and third positions.

25. The method of claim 20, wherein the first direction is characterized as an arc.

26. The method of claim 19, wherein increasing the optical coupling efficiency further comprises:

moving the optical component along a first plane; and

moving the optical component along a second plane that is not parallel to the first plane.

27. The method of claim 26, wherein the first and second planes are substantially perpendicular to each other.

28. The method of claim 19, further comprising measuring a first light intensity after moving the optical component and before increasing the optical coupling efficiency, wherein:

increasing the optical coupling efficiency comprises measuring a second light intensity;

the first and second light intensities are representative of an intensity of light transmitted though the optical switch; and

the first and light intensities are above a minimum threshold that corresponds to an optical connection between the optical component and the first optical receiver.

29. The method of claim 19, wherein the method is used for fiber-to-fiber optical alignment.

30. The method of claim 19, further comprising transmitting information through the optical switch during the act of increasing the optical coupling efficiency.

31. The method of claim 19, wherein moving the optical component comprises moving the optical component to re-direct the path for the optical signal from a second optical receiver to the first optical receiver.

19. A method of transmitting an optical signal through an optical switch comprising:

moving an optical component to direct a path for the optical signal to a location near the first optical receiver; and

after moving the optical component, increasing an optical coupling efficiency between the optical component and the first optical receiver.

32. An optical configuration comprising:

an optical component;

an optical receiver configured to receive a substantial portion of an optical signal from the optical component;

a semi-reflective film lying between the optical component and the optical receiver; and

an optical tap configured to receive a significant portion of the optical signal that is reflected from the semi-reflective film.

33. The optical configuration of claim 32, further comprising a first fitting and a second fitting, wherein,

within the first fitting:

the optical component is configured to transmit the optical signal to travel in a first direction;

the optical tap is configured to receive a significant fraction of the optical signal in a third direction that is substantially opposite to the first direction.

within the second fitting, the optical receiver is configured to receive a substantial fraction of the optical signal in a second direction that is substantially a same direction as the first direction.

34. The optical configuration of claim 33, wherein an air gap lies between the first fitting and the second fitting.

35. The optical configuration of claim 32, wherein:

the optical component comprises an input optical fiber having a end;

the optical receiver comprises an output optical fiber having a end, wherein the ends of the input and output optical fibers are spaced apart from each other and capable of substantially facing each other; and

the optical tap comprises a tap optical fiber having an end, wherein the ends of the input optical fiber and the tap optical fiber substantially face a same direction.

36. The optical configuration of claim 35, further comprising an antireflective film lying between the output optical fiber and the optical tap.

37. The optical configuration of claim 35, wherein:

the ends of the input optical fiber and optical tap lie within a first fitting; and

the end of the output optical fiber lies within a second fitting.

38. The optical configuration of claim 32, wherein:

a surface of the semi-reflective film faces the ends of the input optical fiber and the optical tap; and

the surface is substantially flat and substantially perpendicular to the lengths of the input optical fiber and optical tap within the configuration.

39. The optical configuration of claim 32, wherein the semi-reflective film is configured such that no more than approximately two percent of the intensity of the optical signal from the optical component is reflected by the semi-reflective film.

40. The optical configuration of claim 32, wherein the optical component and optical tap are coupled to a voice coil motor.

41. The optical configuration of claim 32, wherein the optical configuration is part of an optical switch.