Ruggedized fiber optic connection
A fiber optic cable connection system comprising a first fiber optic connector including a ferrule within which an optical fiber is mounted and a fiber optic adapter for receiving the first fiber optic connector including a sleeve for receiving the ferrule. The first fiber optic connector is mounted within a first threaded body with the fiber optic cable extending through an opening in a distal end of the first threaded body and the ferrule accessible through a proximal end of the first threaded body. The fiber optic adapter is mounted within a second threaded body and the second threaded body adapted for mounting to a bulkhead. The second threaded body adapted to engage the proximal end of the first threaded body with the first connector engaging the adapter and the ferrule extending into the sleeve. An outer housing is threadably mounted about both the first and second threaded bodies when the second threaded body is engaging the proximal end of the first threaded body. The first and second threaded bodies and the outer housing cooperate to hold the first connector engaging the adapter.
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The present invention relates generally to fiber optic connectors and adapters. More specifically, the present invention relates to a ruggedized housing for securely connecting and environmentally sealing fiber optic connectors and adapters.
BACKGROUNDIn telecommunications networks, optical fiber service connections to customers are becoming more popular. As the use of optical fiber is extended to more customers directly, the need for improved optical fiber connectors that are able to withstand adverse environmental conditions has increased. Known optical fiber connector and adapter combinations are suitable for connecting optical fiber cables but are not well suited to withstanding adverse weather conditions. Ruggedized fiber optic connection systems are desirable.
In existing telecommunications installations, it is known to have overhead cables providing service to customers. Other service connections or drops also potentially place the service drop cable under some amount of tension or strain. For such service connections, it is known to use an armored cable or a drop cable with added strength members. In conjunction with such service drops, it is desirable to provide drop cable connections which are capable of withstanding the tension or strain exerted by the cable. It is also desirable that these drop cable connections be made with standardized connector and adapter combinations for consistency with other optical fiber connectors and adapters in use in the telecommunications network.
It is also desirable that these drop cable connections be made in the field without the need for field termination of the cables.
SUMMARYThe present invention relates to a fiber optic cable connection system comprising a first fiber optic connector including a ferrule within which an optical fiber is mounted and a fiber optic adapter for receiving the first fiber optic connector including a sleeve for receiving the ferrule. The first fiber optic connector is mounted within a first threaded body with the fiber optic cable extending through an opening in a distal end of the first threaded body and the ferrule accessible through a proximal end of the first threaded body. The fiber optic adapter is mounted within a second threaded body and the second threaded body adapted for mounting to a bulkhead. The second threaded body adapted to engage the proximal end of the first threaded body with the first connector engaging the adapter and the ferrule extending into the sleeve. An outer housing is threadably mounted about both the first and second threaded bodies when the second threaded body is engaging the proximal end of the first threaded body. The first and second threaded bodies and the outer housing cooperate to hold the first connector engaging the adapter.
The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate several aspects of the present invention and together with the description, serve to explain the principles of the invention. A brief description of the drawings is as follows:
Reference will now be made in detail to the exemplary aspects of the present invention that are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.
Referring now to
Bulkhead assembly 56 54 includes adapter 18 having a first end 24 for receiving an optical fiber connector such as connector 22 and a second end 26. Second end 26 as shown in also configured to receive a fiber optic connector such as connector 22. While both ends 24 and 26 are shown configured to receive a standard SC connector, it is anticipated that other styles and formats of optical fiber connectors may be used with the present invention. It is also anticipated that first end 24 and second end 26 may receive different format or style optical fiber connectors. Bulkhead assembly 56 54 also includes a second threaded body 16 through which adapter 18 is mounted. Second threaded body 16 includes a rear face 58 which adapted to fit against an outer wall of a bulkhead with second end 26 and first end 24 of adapter 18 on opposite sides of the bulkhead. As system 10 is adapted to seal the connector 22 within first end 24 of adapter 18 against tension and adverse environmental effects, it is anticipated that first end 22 will be positioned on the side of the bulkhead most likely to be subjected to such conditions. Examples of such an installation include mounting bulkhead assembly 56 54 to an outer wall of a junction box housing mounted atop a utility pole.
First threaded body 14 and second threaded body 16 engage each other, as will be described further below, and form a continuous thread for outer housing 20 to threadably engage. A first end 21 of outer housing 20 engages an o-ring 28 mounted about first threaded body 16 opposite rear face 58. O-ring 28 forms a weather resistant seal between first end 21 of outer housing 20 and second threaded body 16. As will be described further below, a second o-ring 34 (shown in
Connector 22 includes a ferrule 23 where an end of an optical fiber of cable 12 is terminated. Adapter 18 includes a sleeve 42 within a central opening 32 sized to receive ferrule 23 when connector 22 is received within first end 24 of adapter 18. Sleeve 42 also extends within second opening 26 to receive a ferrule of a fiber optic connector inserted within second end 26 of adapter 18. The ferrule of two connectors inserted within the two ends of adapter 18 aligned with each other within central opening 32 so that optical signals may be transferred between the cables terminated at each of the ferrules. Adapter 18 and connector 22 are described in further detail in U.S. Pat. No. 5,317,663, the disclosure of which is incorporated herein by reference. U.S. Pat. No. 5,317,663 describes an SC type connector and adapter.
Referring now to
Referring now to
Also, when one of the male housing ends 114 is inserted within one of the female housing ends 118 or 120, a latching mechanism 116 positioned about each of the male housing ends 114 engages mating surfaces (not shown) inside the female housing ends. Latching mechanism 116 and the mating surfaces within the female housing ends releasably and securely hold system 100 together to resist tension from cable 12.
Bulkhead assemblies 104 are mounted to a bulkhead 109 of a service drop housing 108. Within service drop housing 108, a fiber optic cable extends to each bulkhead assembly 104. These interior cables include optical fibers but may or may not include any strength members.
Referring to
One of the features of system 100 is that access is provided to the end face of each ferrule holding an optical fiber during installation system 100. For example, to activate a new service drop, assuming that a bulkhead assembly 104 was available for use, a field technician might remove plug assembly 110 from adapter housing 106 and adapter housing 106 from bulkhead assembly 104. The technician could then inspect, and if necessary clean the end face of ferrule 23 of connector 22 within bulkhead assembly 104. Adapter body 106 might then be replaced with end 114 recevied within end 118 and ferrule 23 of connector 22 of bulkhead assembly 104 inserted within sleeve 42. The new service drop cable 12 with a cable end assembly 102 might then be cleaned and inspected for contaminates on ferrule 23. If the drop cable is suitable, end 120 might be inserted within the opposite end 114 of adapter body 106 with ferrule 23 received within sleeve 42. The two ferrules 23 within sleeve 42 are brought into alignment with each other to permit the passage of optical signals from one optical fiber to the other.
It is anticipated that system 100 might be adapted for use with the threaded bodies of system 10. Such a third embodiment system 200 is shown in
The above specification, examples and data provide a complete description of the manufacture and use of the invention. Since many embodiments of the invention can be made without departing from the spirit and scope of the invention, the invention resides in the claims hereinafter appended.
Claims
1. A fiber optic cable connection system comprising:
- a first fiber optic connector with a first end and a second end, the second end mounted to an end of a fiber optic cable, and the first end including a ferrule within which an optical fiber of the fiber optic cable is mounted;
- a fiber optic adapter including a first end for receiving the first fiber optic connector, the first end including a sleeve for receiving the ferrule and aligning the optical fiber within the ferrule with a longitudinal axis of the sleeve;
- the first fiber optic connector mounted within a first threaded body with the fiber optic cable extending through an opening in a distal end of the first threaded body and the ferrule accessible through a proximal end of the first threaded body;
- the fiber optic adapter mounted within a second threaded body and the second threaded body adapted for mounting to a bulkhead;
- the second threaded body adapted to engage the proximal end of the first threaded body with the first end of the first connector engaging the first end of the adapter and the ferrule of the connector extending into the sleeve of the adapter;
- an outer housing threadably mounted about both the first and second threaded bodies when the second threaded body is engaging the proximal end of the first threaded body; and
- the first and second threaded bodies and the outer housing cooperating to hold the first end of the first connector engaging the first end of the adapter.
2. The fiber optic cable connection system of claim 1, wherein the first fiber optic connector is a standardized fiber optic connector and the first end of the adapter is adapted to receive the standardized fiber optic connector.
3. The fiber optic cable connection system of claim 2, wherein the first connector is an SC connector and the first end of the adapter is adapted to receive the SC connector.
4. The fiber optic cable connection system of claim 1, wherein the fiber optic adapter further includes a second end for receiving a second fiber optic connector with a ferrule, the second end including a sleeve for receiving the ferrule of the second connector and aligning an optical fiber within the ferrule of the second connector with the optical fiber within the ferrule of the first connector.
5. The fiber optic cable connection system of claim 4, wherein the second fiber optic connector is a standardized fiber optic connector and the second end of the adapter is adapted to receive the standardized fiber optic connector.
6. The fiber optic cable connection system of claim 5, wherein the second connector is an SC connector and the second end of the adapter is adapted to receive the SC connector.
7. The fiber optic cable connection system of claim 1, wherein a first o-ring is positioned about the fiber optic cable adjacent the distal end of the first threaded body, a second o-ring is positioned about the second threaded body, and the outer housing engages both o-rings to environmentally seal the first ends of the first connector and the adapter.
8. The fiber optic cable connection system of claim 1, wherein the second threaded body is fixedly mounted to a bulkhead and the threaded bodies and the outer housing cooperate to transfer tension from the cable to the bulkhead without disengaging the first end of the first connector from the first end of the adapter.
9. A fiber optic cable connection system comprising:
- a fiber optic connector with a first end and a second end, the second end mounted to an end of a fiber optic cable, and the first end including a ferrule within which an optical fiber of the fiber optic cable is mounted;
- the fiber optic adapter including a first end for receiving the first fiber optic connector, the first end including a sleeve for receiving the ferrule and aligning the optical fiber within the ferrule with a longitudinal axis of the sleeve;
- a first fastening arrangement for securing the fiber optic connector within the first end of the fiber optic adapter; and
- a second fastening arrangement for securing the fiber optic connector within the first end of the fiber optic adapter;
- wherein the first fastening arrangement includes at least one latch member, and the second fastening arrangement includes a threaded coupling.
10. The fiber optic cable connection system of claim 9, wherein the at least one latch member is provided at the fiber optic adapter, and wherein the at least one latch member engages a portion of the fiber optic connector to secure the fiber optic connector within the fiber optic adapter.
11. The fiber optic cable connection system of claim 9, wherein the threaded coupling includes a threaded member that mounts over the fiber optic connector and is rotatable relative to the fiber optic connector, and wherein the threaded coupling also includes a threaded portion provided at the first end of the fiber optic adapter that threadedly engages the threaded member to secure the fiber optic connector within the fiber optic adapter.
12. A fiber optic connector assembly comprising:
- a plug arrangement including: a first body; at least one shell positioned at least partially within the first body; a ferrule positioned at least partially within the at least one shell;
- an outer housing positioned around the first body of the plug arrangement, the outer housing defining inner threads;
- a receptacle arrangement that receives the plug arrangement, the receptacle arrangement including a second body having outer threads, the outer housing and the second body being threaded together through interaction of the inner and outer threads to secure the plug arrangement within the receptacle arrangement; and
- the at least one shell including a first keying element and the first body including a second keying element, the first and second keying elements interfacing with the receptacle arrangement to ensure that the plug arrangement is inserted into the receptacle arrangement at a predetermined rotational orientation.
13. The fiber optic connector assembly of claim 12, wherein the first body is generally cylindrical.
14. The fiber optic connector assembly of claim 12, wherein the at least one shell includes an inner shell and an outer shell, and wherein the first keying element is provided on the outer shell.
15. The fiber optic connector assembly of claim 14, wherein the first keying element includes a rail.
16. The fiber optic connector assembly of claim 12, wherein the second keying element includes a key member that fits within a corresponding key receiver of the receptacle arrangement.
17. The fiber optic connector assembly of claim 12, wherein the second keying element includes a key receiver that receives a corresponding key member of the receptacle arrangement.
18. The fiber optic connector assembly of claim 17, wherein the plug assembly defines a central longitudinal axis, wherein the key receiver and the first keying element are aligned along a plane that extends along the central longitudinal axis and that bisects the plug assembly, and wherein the key receiver is positioned a further radial distance outward from the central longitudinal axis than the first keying element.
19. The fiber optic connector assembly of claim 17, wherein the plug assembly defines a central longitudinal axis, and wherein the key receiver is positioned a further radial distance outward from the central longitudinal axis than the first keying element.
20. A fiber optic cable and connector assembly comprising:
- a fiber optic cable including an optical fiber, the fiber optic cable also including first and second strength members positioned at opposite sides of the optical fiber, the fiber optic cable further including a jacket surrounding the optical fiber and the first and second strength members, the jacket defining an elongate transverse cross-sectional shape;
- a plug arrangement including: a first body defining a central longitudinal axis, the first body having a front end and a rear end, the front end including two axially extending key members positioned at opposite sides of the central longitudinal axis; a shell positioned at least partially within the first body; a ferrule positioned at least partially within the shell, the ferrule receiving an end of the optical fiber of the fiber optic cable; a spring positioned within the shell for biasing the ferrule in a forward direction; a spring retainer that retains the spring within the shell; and a cable mount including a cable receiving portion positioned rearward of the spring retainer, the first and second strength members of the fiber optic cable being physically attached within the cable receiving portion of the cable mount;
- an outer housing positioned around the first body of the plug arrangement, the outer housing defining first threads;
- a receptacle arrangement for receiving the plug arrangement, the receptacle arrangement including a second body, the receptacle arrangement also including a fiber optic adapter that receives an end portion the ferrule when the plug arrangement is inserted within the receptacle arrangement, the fiber optic adapter being positioned at least partially within the second body, the second body including oppositely positioned key receiving portions that receive the key members of the first body to ensure that the plug arrangement is oriented at a predetermined rotational orientation when the plug arrangement is inserted within the receptacle arrangement; and
- the second body including second threads, the outer housing and the second body being threaded together through interaction of the first and second threads to secure the plug arrangement within the receptacle arrangement.
21. The fiber optic cable and connector assembly of claim 20, wherein the jacket defines a first passage for receiving the first strength member and a second passage for receiving the second strength member.
22. The fiber optic cable and connector assembly of claim 20, wherein the jacket generally has top and bottom sides interconnected by oppositely positioned curved sides, the top and bottom sides defining a width, the curved sides defining a height, the width being greater than the height.
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Type: Grant
Filed: Oct 31, 2007
Date of Patent: Jul 5, 2011
Assignee: ADC Telecommunications, Inc. (Eden Prairie, MN)
Inventors: Steven C. Zimmel (Minneapolis, MN), Trevor D. Smith (Eden Prairie, MN), Michael J. Shorter (Lonsdale, MN)
Primary Examiner: Thanh-Tam T Le
Attorney: Merchant & Gould P.C.
Application Number: 11/981,850
International Classification: G02B 6/38 (20060101);