Optical fiber coupling and inline fault monitor device and method

• US 7,088,880 B1
• Filed: 12/24/2003
• Issued: 08/08/2006
• Est. Priority Date: 12/24/2003
• Status: Active Grant

• Current Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Original Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Inventors: Gershman, Vladimir
• Primary Examiner(s): Font, Frank G.
• Assistant Examiner(s): Hughes, James P.
• Application Number:
  US10/746,302
• Time in Patent Office: 958 Days
• Field of Search: 385/12, 385/52
• US Class Current: 385/12
• CPC Class Codes: G01M 11/37 in which light is projected perpendicularly to the axis of the fibre or waveguide for monitoring a section thereof
• CPC Class Codes: G02B 6/3807 Dismountable connectors, i.e. comprising plugs
• CPC Class Codes: G02B 6/385 Accessories for testing or observation of connectors means for centering or aligning the light guide within the ferrule with auxiliary facilities for movably aligning or adjusting the fibre within its ferrule, measuring position, eccentricity G02B6/3843; mechanical features associated with the optical testing of optical fibres G01M11/088
• CPC Class Codes: G02B 6/3897 Connectors fixed to housings, casing, frames or circuit boards G02B6/44528 takes precedence
• CPC Class Codes: H04B 10/07955 Monitoring or measuring power

Abstract

An optical fiber connection arrangement includes an alignment sleeve for coaxially aligning optical fibers mounted in ferrules. A gap between the ends of the optical fibers allows some light to escape. A sensor responds to the leaked light, and the resulting signal is processed to determine whether light signal is present or absent.

Claims

1. A sensor for use in conjunction with light flow through a junction between first and second optical fibers, said sensor comprising:

an alignment sleeve including first and second ends, said first and second ends of said alignment sleeve being dimensioned to accommodate ends of first and second optical fiber ferrules, said alignment sleeve, when assembled with said ferrules, coaxially aligning the associated first and second optical fibers, respectively, to thereby facilitate the flow of light across a gap between said first and second optical fibers;

an optical sensor located adjacent said gap, for generating an electrical signal representative of light leaking from said gap; and

indication means responsive to said electrical signal for providing an indication of light flow through said gap.

2. A sensor for use in conjunction with light flow through a junction between first and second optical-signal-carrying optical fiber assemblies, said sensor comprising:

an alignment sleeve defining first and second ends, said first and second ends of said alignment sleeve being dimensioned to removably accommodate ends of said first and second optical-signal-carrying optical fiber assemblies, respectively, said alignment sleeve, when assembled with said ferrules, coaxially aligning the associated first and second optical-signal-carrying optical fiber assemblies with a gap therebetween, to thereby facilitate the flow of said optical signal through said gap and said first and second optical-signal-carrying optical fiber assemblies;

an optical sensor mounted on said sleeve and located adjacent said gap, for generating an electrical signal representative of optical signal leaking from said gap as a result of flow of said optical signal through said first optical-signal-carrying optical fiber assembly, said gap, and said second optical-signal-carrying optical fiber assembly; and

indication means mounted on said sleeve and responsive to said electrical signal for providing an indication of said optical signal flow through said gap.

3. A sensing optical fiber connection arrangement according to claim 2, wherein said indication means comprises a visual indicator.

4. A sensing optical fiber connection arrangement according to claim 3, wherein said visual indicator is a light-emitting solid-state device.

5. A sensing optical fiber connection arrangement according to claim 4, wherein said light-emitting solid-state device includes a light-emitting diode.

6. A sensing optical fiber connection arrangement according to claim 2, wherein said indication means comprises a digital electrical network interface.

7. A sensing optical fiber connection arrangement according to claim 2, wherein said indication means comprises a serial data bus interface.

8. A sensing optical fiber connection arrangement according to claim 7, wherein said serial data bus interface is to an I²C bus connection.

9. A sensing optical fiber connection arrangement according to claim 2, wherein said alignment sleeve is part of a bulkhead connector.

10. A system for monitoring light flow through sets of optical fibers, each of said sets of optical fibers including first and second optical fibers with a junction therebetween, said system comprising a plurality of sensors, each of said sensors comprising:

an alignment sleeve including first and second ends, said first and second ends of said alignment sleeve being dimensioned to accommodate ends of first and second optical fiber ferrules of a set of said optical fibers, said alignment sleeve, when assembled with said ferrules, coaxially aligning the associated first and second optical fibers, respectively, of one of said plural sets of optical fibers, to thereby facilitate the flow of light through said first and second optical fibers, and across a gap between said first and second optical fibers of said one of said sets of optical fibers, which flow of light across said gap results in leakage of some of the light of said flow of light;

an optical sensor located adjacent said gap, for generating an electrical signal representative of the light leaking from said gap;

an address generator for generating a unique address for each of said sensors; and

network bus connection means responsive to said electrical signal and to said address, for generating a network bus signal including information relating to the light flow through said gap and the identity of said sensor.

11. A system according to claim 10, further comprising a bus coupled to said bus connection means of each of said sensors and to utilization means.

12. A system according to claim 11, wherein said bus connection means generates said network bus signal according to a first bus protocol;

and

further comprising protocol conversion means coupled to said bus, for converting said first bus protocol to a second bus protocol.

13. A sensing optical fiber connection arrangement for use with first and second optical-signal-carrying optical fiber assemblies, where each of said optical-signal-carrying optical fiber assemblies has an end, which end is permanently fitted with a ferrule having predetermined dimensions, said connection arrangement comprising:

an alignment sleeve including first and second ends, said first and second ends of said alignment sleeve being dimensioned to removably accommodate said first and second optical fiber ferrules, respectively, for, when said first and second permanently affixed optical fiber ferrules are accommodated within said sleeve, coaxially aligning said ends of said first and second optical-signal-carrying optical fibers, and holding said ends of said first and second optical-signal-carrying optical fibers separated by a predetermined gap;

an optical sensor located adjacent said gap, for generating an electrical signal representative of optical signal leaking from said gap; and

indication means responsive to said electrical signal for providing an indication of optical signal flow through said gap.

14. A sensing optical fiber connection arrangement according to claim 13, wherein said optical sensor is physically mounted on said alignment sleeve.

15. A sensing optical fiber connection arrangement according to claim 14, wherein said alignment sleeve defines an aperture extending at least partially therethrough at a location adjacent said gap;

and

said optical sensor is mounted within said aperture.

16. A sensing optical fiber connection arrangement according to claim 13, wherein said indication means is mounted on said alignment sleeve.

17. An indicating optical-signal-carrying optical fiber connection array for use with a plurality of optical-signal-carrying optical fiber assemblies, where each of said optical-signal-carrying optical fiber assemblies has an end, which end is permanently fitted with a ferrule having predetermined dimensions, said connection arrangement comprising:

a spatial array of a plurality of alignment sleeves, each of said alignment sleeves including first and second ends, said first and second ends of each of said alignment sleeves being dimensioned to removably accommodate said first and second optical fiber ferrules, respectively, of a selected pair of said optical-signal-carrying optical fiber assemblies for, when said first and second optical fiber ferrules of said selected pair of optical-signal-carrying optical fiber assemblies are accommodated within said sleeve, coaxially aligning said ends of said first and second optical-signal-carrying optical fibers of said selected pair of optical-signal-carrying optical fiber assemblies, and holding said ends of said first and second optical-signal-carrying optical fibers of said selected pair of optical-signal-carrying optical fiber assemblies separated by a predetermined gap;

an optical sensor mounted on each of said alignment sleeves at a location adjacent said gap, for generating an electrical signal representative of optical signal leaking from said gap; and

indication means mounted on each of said alignment sleeves, each of said indication means being responsive to said electrical signal from the associated one of said optical sensors for providing an indication of optical signal flow through the associated one of said gaps.

18. An indicating optical-signal-carrying optical fiber connection array according to claim 17, wherein said indication means comprises a digital electrical network interface.

19. An indicating optical-signal-carrying optical fiber connection array according to claim 18, wherein said indication means comprises a serial data bus interface.

20. An indicating optical-signal-carrying optical fiber connection array according to claim 19, wherein said serial data bus interface is to an I²C bus connection.

21. An indicating optical-signal-carrying optical fiber connection array according to claim 17, wherein said alignment sleeve is part of a bulkhead connector.

22. An indicating optical-signal-carrying optical fiber connection array according to claim 21, wherein said bulkhead connector is mounted on a plate.

23. An indicating optical-signal-carrying optical fiber connection array according to claim 22, wherein said plate is a bulkhead.