Test unit and method for simultaneous testing of multiple optical fibers

• US 5,936,719 A
• Filed: 07/16/1997
• Issued: 08/10/1999
• Est. Priority Date: 07/16/1996
• Status: Expired due to Fees

• Current Assignee: Robert W. Johnson
• Original Assignee: Robert W. Johnson
• Inventors: Johnson, Robert W.
• Primary Examiner(s): Font, Frank G.
• Assistant Examiner(s): Ratliff, Reginald A.
• Application Number:
  US08/893,243
• Time in Patent Office: 755 Days
• Field of Search: 356/73.1, 359/110, 359/173
• US Class Current: 356/73.1
• CPC Class Codes: G01M 11/3136 for testing of multiple fibers

Abstract

An apparatus and method for simultaneously testing a plurality of optical fibers, preferably using optical time domain reflectometry, wherein the apparatus includes a light source for providing a pulse of light, at least one splitter means positioned for receiving the pulse of light and for splitting the pulse of light into at least two substantially identical pulses of light, and a plurality of coupling means, each connected to one of the optical fibers under test and each positioned for receiving one of substantially identical pulses of light and directing that pulse of light into an optical fiber. In a preferred embodiment, the backscattered signals from the optical fibers are directed back through the coupling means to a plurality of receivers and data averagers.

Claims

1. Apparatus for testing a plurality of optical fibers comprising:

a light source for providing a pulse of light;

at least one splitter means positioned for receiving said pulse of light and for splitting said pulse of light into at least two substantially identical pulses of light; and

a plurality of coupling means, each connected to one of said plurality of optical fibers under test for receiving one of said at least two substantially identical pulses of light and for directing said one of said at least two substantially identical pulses of light into said one of said plurality of optical fibers under test.

2. Apparatus as in claim 1, further comprising a combining means connected to each of said plurality of coupling means for combining backscattered signals received from each of said plurality of optical fibers under test and for providing an output thereof.

3. Apparatus as in claim 2, further comprising a receiver for receiving said output of said combining means.

4. Apparatus as in claim 3, further comprising a data averaging means connected to said receiver for sampling said received output of said combining means and converting said output to digital format.

5. Apparatus as in claim 1, further comprising a plurality of receivers, each connected to one of said plurality of coupling means, for receiving backscattered signals from one of said plurality of optical fibers under test.

6. Apparatus as in claim 5, further comprising a plurality of data averaging means, each connected to one of said plurality of receivers for sampling said received backscattered signals from one of said plurality of optical fibers under test and converting said signals to digital format.

7. Apparatus as in claim 1, wherein each of said plurality of coupling means comprises a configurable-coupler which is controllable to operate as a coupler or a light shutter.

17. An apparatus as in claim 7, further comprising a control means for controlling each of said configurable-couplers.

18. An apparatus as in claim 1, wherein said splitter means comprises one optical splitter positioned for splitting said pulse of light into two substantially identical pulses of light.

19. An apparatus as in claim 1, wherein said splitter means comprises three optical splitters positioned for splitting said pulse of light into four substantially identical pulses of light.

20. An apparatus as in claim 1, wherein said light source is a laser light source.

8. A method for testing a plurality of optical fibers comprising:

providing a pulse of light with a light source;

splitting said pulse of light into at least two substantially identical pulses of light; and

directing one of said at least two substantially identical pulses of light into each of said plurality of optical fibers under test using a coupling means connected to each of said plurality of optical fibers.

9. A method as in claim 8, further comprising combining backscattered signals from each of said plurality of optical fibers with a combining means and providing an output from said combining means of combined backscattered signals.

10. A method as in claim 9, further comprising receiving said combined backscattered signals from said combining means with a receiver and providing an output from said receiver.

11. A method as in claim 10, further comprising sampling said output from said receiver and converting said output to digital format with a data averaging means.

12. A method as in claim 8, further comprising using a plurality of receivers, each one of said plurality of receivers for receiving backscattered signals from one of said optical fibers under test.

13. A method as in claim 12, further comprising using a plurality of data averaging means, each said data averaging means connected to one of said plurality of receivers, for sampling said received backscattered signals from said one of said optical fibers under test.

14. A method as in claim 8, wherein each of said plurality of coupling means comprises a configurable-coupler controllable to operate as a coupler or a light shutter.

15. A method as in claim 14, further comprising a first mode wherein each of said configurable-couplers is controlled to operate as a coupler and a second mode wherein one of said configurable-couplers is controlled to operate as a coupler and the remaining ones of said configurable-couplers are controlled to operate as light shutters.

16. A method as in claim 14, wherein each of said configurable-couplers controlled to operate as light shutters is further controlled to be set to the "off" position so that no light is passed through said configurable-couplers.