Fiber optic rotary switching device

• US 4,753,501 A
• Filed: 01/15/1986
• Issued: 06/28/1988
• Est. Priority Date: 01/15/1986
• Status: Expired due to Fees

• Current Assignee: United States Of America As Represented By The Secretary Of The Air Force
• Original Assignee: United States Of America As Represented By The Secretary Of The Air Force
• Inventors: Battle, Stanley D.
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): Ullah, Akm E.
• Application Number:
  US06/818,922
• Time in Patent Office: 895 Days
• Field of Search: 350/96.10, 350/96.20
• US Class Current: 385/22
• 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 6/3548 1xN switch, i.e. one input and a selectable single output of N possible outputs
• CPC Class Codes: G02B 6/359 of the position of the moving element itself during switching, i.e. without monitoring the switched beams
• CPC Class Codes: G02B 6/3604 Rotary joints allowing relative rotational movement between opposing fibre or fibre bundle ends

Abstract

A fiber optic rotary switching device having a single optical fiber rotatable between a plurality of optical fibers. The arrangement for rotating the single optical fiber is designed such that the single optical fiber flexes but does not twist with respect to an end thereof which is fixed to a light source (or, in the alternative to a light detector). As a result, the switching device switches light passing through the single optical fiber to a preselected one of the plurality of optical fibers while simultaneously preventing extraneous light from reaching the other optical fibers.

Claims

1. A fiber optic rotary switching device, comprising:

means for securing a plurality of optical fibers in predetermined spaced apart relationship with respect to each other;

a single optical fiber having a first end and a second end, said single optical fiber being positioned adjacent said plurality of optical fibers;

rotatable means interposed between said plurality of optical fibers securing means and said single optical fiber for mounting said first end of said single optical fiber thereto for movement therewith in such a manner that said single optical fiber flexes with respect to said second end thereof yet is prevented from twisting as said rotatable optical fiber mounting means rotates; and

means operably connected to said rotatable optical fiber mounting means for rotating said optical fiber mounting means to a plurality of predetermined positions in which said first end of said single optical fiber is optically aligned with a preselected one of said plurality of optical fibers.

2. A fiber optic rotary switching device as defined in claim 1 further comprising means operably associated with said rotatable optical fiber mounting means in order to monitor the position of said single optical fiber as said rotatable optical fiber mounting means rotates to said plurality of predetermined positions.

3. A fiber optic rotary switching device as defined in claim 1 further comprising means interposed between said plurality of optical fibers securing means and said rotatable optical fiber mounting means for preventing extraneous light from entering all except said preselected one of said plurality of optical fibers which is optically aligned with said single optical fiber.

4. A fiber optic rotary switching device as defined in claim 1 wherein said rotatable optical fiber mounting means comprises a disk-like plate, means fixedly secured to said first end of said single optical fiber, and means positioned on said disk-like plate for encompassing said single optical fiber securing means in such a manner as to enable said optical fiber securing to move freely therein.

5. A fiber optic rotary switching device as defined in claim 4 wherein said encompassing means is in the form of a ferrule housing and said securing means is in the form of a ferrule.

6. A fiber optic rotary switching device as defined in claim 2 wherein said means for monitoring the position of said single optical fiber comprises a plurality of openings of preselected configurations situated adjacent the outer periphery of said rotatable optical fiber mounting means and means for detecting the presence of said plurality of openings in order to ascertain the position of said single optical fiber.

7. A fiber optic rotary switching device as defined in claim 1 wherein said means for rotating said rotatable optical fiber mounting means comprises a stepper motor.

8. A fiber optic rotary switching device as defined in claim 1 wherein said second end of said single optical fiber is connected to a light source.

9. A fiber optic rotary switching device as defined in claim 1 wherein said second end of said single optical fiber is connected to a light detector.

10. A fiber optic rotary switching device as defined in claim 3 wherein said light preventing means comprises a gasket secured to said rotatable optical fiber mounting means, said gasket having a single opening therein juxtaposed said first end of said single optical fiber.

11. A fiber optic rotary switching device as defined in claim 3 wherein said light preventing means comprises a gasket secured to said plurality of optical fibers securing means, said gasket having a plurality of openings therein, each of said openings being aligned with a respective one of said plurality of optical fibers.

12. A fiber optic rotary switching device as defined in claim 6 wherein said means for monitoring the position of said single optical fiber further comprises a light source optically aligned with at least one of said openings of said preselected configurations in order to pass said light therethrough and a light detector positioned to receive said light passing through said openings of preselected configurations, said detector providing a signal representative of said position of said single optical fiber.

13. A fiber optic rotary switching device as defined in claim 2 further comprising means interposed between said plurality of optical fibers securing means and said rotatable optical fiber mounting means for preventing extraneous light from entering all except said preselected one of said plurality of optical fibers which is optically aligned with said first end of said single optical fiber.

14. A fiber optic rotary switching device as defined in claim 4 wherein said plurality of optical fibers securing means comprises a housing having a face plate, said face plate having a plurality of spaced apart holes therein, each of said plurality of optical fibers being secured within one of said plurality of holes, respectively, and said face plate being positioned juxtaposed said disk-like plate such that each of said plurality of holes are capable of being optically aligned with said first end of said single optical fiber.

15. A fiber optic rotary switching device as defined in claim 13 wherein said rotatable optical fiber mounting means comprises a disk-like plate, means fixedly secured to said first end of said single optical fiber, and means positioned on said disk-like plate for encompassing said single optical fiber securing means in such a manner as to enable said optical fiber securing to move freely therein.

16. A fiber optic rotary switching device as defined in claim 15 wherein said means for monitoring the position of said single optical fiber comprises a plurality of openings of preselected configurations situated adjacent the outer periphery of said rotatable optical fiber mounting means and means for detecting the presence of said plurality of openings in order to ascertain the position of said single optical fiber.

17. A fiber optic rotary switching device as defined in claim 16 wherein said light preventing means comprises a gasket secured to said rotatable optical fiber mounting means, said gasket having a single opening therein juxtaposed said the first end of said single optical fiber.

18. A fiber optic rotary switching device as defined in claim 16 wherein said light preventing means comprises a gasket secured to said plurality of optical fibers securing means, said gasket having a plurality of openings therein, each of said openings being aligned with a respective one of said plurality of optical fibers.

19. A fiber optic rotary switching device as defined in claim 16 wherein said means for monitoring the position of said single optical fiber further comprises a light source optically aligned with at least one of said openings of said preselected configurations in order to pass said light therethrough and a light detector positioned to receive said light passing through said openings of preselected configurations, said detector providing a signal representative of said position of said single optical fiber.

20. A fiber optic rotary switching device as defined in claim 19 wherein said means for rotating said rotatable optical fiber mounting means comprises a stepper motor.