The present invention relates generally to an enclosure for distributing optical fibers for telecommunications, and in particular to an enclosure housing an extractable fiber organizer.
Telecommunication cables are used for distributing all manner of data across vast networks. A telecommunication cable typically includes a bundle of individual telecommunication lines (either optical fibers or copper wires) that are encased within a protective sheath. As telecommunication cables are routed across data networks, it is necessary to periodically open the cable so that one or more telecommunication lines therein may be spliced, thereby allowing data to be distributed to other cables or “branches” of the telecommunication network. The cable branches may be further distributed until the network reaches individual homes, businesses, offices, premises, and so on.
At each point where a telecommunication cable is opened, some type of enclosure is provided to protect the exposed interior of the cable. Commonly, the enclosure has one or more ports through which cables enter and/or exit the enclosure. Once inside the enclosure, the cable is opened to expose the telecommunication lines therein. Conventional telecommunication enclosures are constructed to facilitate the management and protection of individual telecommunication lines and splices thereof.
For some fiber-to-the-x (FTTX) deployments, a service provider typically installs an enclosure (also known as a fiber distribution terminal (FDT)) at the ground floor, on each floor, or every few floors of a multi-dwelling unit (MDU), residence, or business. The FDT connects the building riser cable to the horizontal drop cables which run to each living unit (in the MDU or on a particular floor). Drop cables are spliced to the riser cable in the FDT only as service is requested from a tenant in a living unit. Connecting existing MDUs to the FTTX network can often be difficult. Challenges can include gaining building access, limited distribution space in riser closets, and space for cable routing and management.
In one aspect, an embodiment of the invention described herein provides an enclosure for distributing optical fibers for communications. The enclosure includes a housing to house at least one optical fiber from a distribution cable and at least one drop fiber and an extractable fiber organizer disposable in the housing. The extractable fiber organizer includes at least one splice tray rotatably coupled to a fiber ramp, the fiber ramp being detachably disposed in the housing. A fiber slack storage unit is disposed within the housing, the fiber slack storage unit including a fiber slack storage tray configured to spool fiber slack.
The above summary of the present invention is not intended to describe each illustrated embodiment or every implementation of the present invention. The figures and the detailed description that follows more particularly exemplify these embodiments.
Embodiments of the invention are better understood with reference to the following drawings. The elements of the drawings are not necessarily to scale relative to each other.
While the invention is amenable to various modifications and alternative forms, specifics thereof have been shown by way of example in the drawings and will be described in detail. It should be understood, however, that the intention is not to limit the invention to the particular embodiments described. On the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the scope of the invention as defined by the appended claims.
In the following Detailed Description, reference is made to the accompanying drawings, which form a part hereof, and in which is shown by way of illustration specific embodiments in which the invention may be practiced. In this regard, directional terminology, such as “top,” “bottom,” “front,” “back,” “leading,” “forward,” “trailing,” etc., is used with reference to the orientation of the Figure(s) being described. Because components of embodiments of the present invention can be positioned in a number of different orientations, the directional terminology is used for purposes of illustration and is in no way limiting. It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present invention. The following detailed description, therefore, is not to be taken in a limiting sense, and the scope of the present invention is defined by the appended claims.
The present invention is directed to a fiber distribution system which includes an enclosure housing an extractable fiber organizer that allows an installer or service technician more access to the fiber distribution point. In particular, the structure of the fiber distribution system with the extractable fiber organizer allows the installer or service technician to work on fiber splices in a comfortable position, especially for an enclosure located in a riser or underground chamber. Further, the extractable fiber organizer provides for a more straightforward way to add or remove a fiber drop without disturbing service to a different customer.
As shown in
Enclosure 100 can take any standard shape. In a preferred aspect, the enclosure can take a rectangular shape of reduced dimensions in order to utilize the enclosure in areas that are space-limited. The various components of the enclosure 100, including the base, cover, slack storage and fiber organizer 130, and elements thereof, can be formed of any suitable material. The materials are selected depending upon the intended application and may include both polymers and metals. In one embodiment, the base and cover, and the other components, are formed of polymeric materials by methods such as injection molding, extrusion, casting, machining, and the like. Alternatively, components may be formed of metal by methods such as molding, casting, stamping, machining and the like. Material selection will depend upon factors including, but not limited to, chemical exposure conditions, environmental exposure conditions including temperature and humidity conditions, flame-retardancy requirements, material strength, and rigidity, to name a few.
The base 110 of enclosure 100 can include one or more ports for receiving and distributing telecommunications cables. For example, as shown in
In one aspect, splice tray section 150 includes one or more exemplary splice trays 151a, 151b. For smaller size enclosures, the number of splice trays may be on the order of 1 to 8 splice trays. As would be understood by one of ordinary skill in the art given the present description, a larger sized base unit would accommodate a much greater number of splice trays. Splice trays 151a, 151b are provided so that, e.g., a distribution cable fiber can be connected to a drop cable fiber, or other cable fiber, to distribute the communications signal in an intended manner.
In a preferred aspect, the splice trays are rotatable. For example, in
In a preferred aspect, splice tray 151a (and the other splice trays of the enclosure) includes at least one latching mechanism that allows for rotation of the splice tray while secured to the mounting ramp 140. In more detail, splice tray 151a includes a latching mechanism 152 formed on an outer portion of the body of splice tray 151a. The latching mechanism can include a coupling portion 154 and one or more fiber entrance/exit channels 156, 157. Coupling portion 154 can be formed as a rod and can be coupled (e.g., by snap-fit) to hook portion 147 of the mounting ramp 140 (See
In a preferred aspect, fiber entrance/exit channels 156, 157 are formed as extensions that extend away from the main splice tray body area. In addition, fiber entrance/exit channels 156, 157 can extend from the latching area in a slightly curved configuration to prevent potential kinks or unintended bends being placed on the entering/exiting fibers that are received by the splice tray.
In addition, fiber entrance/exit channels 156, 157 provide continual support to the entering/exiting fibers as the splice tray 151a is being rotated forward and backward. In a preferred aspect, channels 156, 157 are formed having a (relatively) deep “U” shape in cross-section, which supports fiber disposed therein even when the splice tray is fully tilted. Further, when latched, the fiber entrance/exit channels 156, 157 can extend into the fiber guiding channels 144a, 144b formed on the mounting ramp 140. Thus, fiber being routed to or from the splice tray can be continually supported.
Fiber from the distribution cable/drop cable is received in fiber entrance/exit channels 156, 157 and then routed to a splicing area 180. The splicing area 180 is configured to support mechanical and/or fusion splices made to the fiber. The mechanical or fusion splices can be of a single fiber or of a mass or ribbon fiber. For example, one or more fibers are guided to splicing portion 184 that is configured to securely hold one or more mechanical/fusion splices (e.g., via snug or snap fit). In one aspect, splicing portion 184 can comprise a number of resilient clips or other holders designed to hold one or more 4×4 FIBRLOK™ splices (commercially available from 3M Company, St. Paul Minn.). The splicing portion 184 can be formed as an integral portion of tray 151a. Alternatively, tray 151a can be formed with a cutout at splicing area 180 so that different splicing inserts can be mounted to the tray, depending on the application (e.g., an insert configured to support one or more fusion splices, or an insert to support one or more mechanical splices). In a preferred aspect, splicing area 180 is configured to secure one or more splices having either a 60 mm length or a 45 mm length.
In an alternative embodiment, the splicing area 180 can be configured to support a plurality of mechanical and/or fusion splices made in a stacked arrangement.
Fibers are routed to the splicing area via one or more fiber routing structures 162 that allow for changing the direction of the fiber in a straightforward manner (and without bending the fiber beyond its minimum bend radius). The fiber routing structures 162 can also provide some slack storage of the incoming/exiting fiber(s). Further fiber guiding structures 164 and tabs 165 can be formed in splice tray 151a to retain, route and support the fiber(s) being spliced.
In an alternative aspect, splicing area 180 can be configured to hold or secure any number of different passive and/or active optical components. For example, splicing area 180 can be configured to hold or secure one or more of 1×N fiber optic splitters, 2×N fiber optic splitters, WDM components, CWDM components, switches, multiplexers, triplexers, duplexers, detectors, mirrors, lasers, amplifiers, or combinations thereof.
In one embodiment, a first splice tray 151a can be configured to hold one or more splices and a second splice tray can be configured to hold one or more passive and/or active optical components. Also, each splice tray can further include a removable cover (not shown), such as a plastic, preferably transparent cover. Preferably, the cover can be mounted onto the splice tray via simple snap fit.
As mentioned above, in a preferred aspect, a technician or user may remove the fiber organizer 130 (including the ramp 140 and splice tray section 150) from the base unit 110 in a straightforward manner when needed.
The mounting ramp 140 further includes one or more fiber retention structures 143a and 143b disposed in ramp channels 144a, 144b for further fiber guidance and support. These ramp channels 144a, 144b are configured to guide the entering/exiting fibers around a modest bending region 145a/145b (not to exceed the minimum bend radius of the fiber(s) disposed therein) to/from the fiber entrance/exit channels 156, 157 of the splice tray(s) mounted thereon. In addition, as mentioned above, the coupling portion 154 (see
In one aspect, the mounting ramp 140 is coupled to the base unit 110 via one or more mounting posts 148 (see
As shown in the example of
Additional fiber retention within the cavity 113 of the base unit can be provided by use of one or more fiber anchors 116. The anchor device(s) 116 wrap around and grasp the fiber(s) to form a bundle and are retained in place through mounting the anchor(s) into a mounting slot(s) 115. Thus, a fiber bundle can be maintained or retained within the slack storage area of the enclosure while in operation. If a technician needs to re-enter the enclosure to add a drop or remove a drop, the fiber bundle held by the anchor(s) 116 is easily accessible and is removable, as is the slack storage tray 122.
Also, as is shown in
As shown in
As mentioned above, enclosure 100 includes a cover to protect the contents of the enclosure. In one aspect, in
Drop fibers can enter/exit the enclosure 100 via one or more ports, such as ports 111a or 111b shown in
In addition, one of the abutment members further includes a threaded receptacle 177 configured to receive a locking screw 179. In operation, the locking screw 179 is turned and compresses the grommet 173 between the abutment members, causing a radial expansion of the grommet against the inner wall(s) of the port 111a and around the perimeter of any cables or plugs inserted therein.
In an alternative aspect, a grommet 173′ can be configured as is shown in
Ports 112a and 112b are utilized to provide an entrance and an exit for riser cable 105.
As mentioned above, the structure of the fiber distribution system with the extractable fiber organizer, such as is shown above in
After splicing of the fiber or fibers, excess fiber can be spooled inside the slack storage area. The cable entry ports can be secured. The fiber organizer 130 can be returned to the enclosure and the anchor can be mounted inside the base unit via one of the mounting slots 115. The spice tray(s) can be tilted to its/their normal use position, and the cover 190 can be mounted onto the base unit. If an installer needs to re-enter the enclosure, the fiber bundle can be removed, as well as the fiber organizer and, in some cases, the slack storage tray. A drop fiber can be added through the entry port grommet and the new drop can be spliced in the same manner as described earlier. The components can then be returned to their positions as before.
Thus, the embodiments of the present invention are directed to a compact fiber distribution enclosure that includes an extractable fiber organizer that provides for a more straightforward way to add or remove a fiber drop without disturbing service to a different customer.
Although specific embodiments have been illustrated and described herein for purposes of description of the preferred embodiment, it will be appreciated by those of ordinary skill in the art that a wide variety of alternate or equivalent implementations may be substituted for the specific embodiments shown and described without departing from the scope of the present invention. Those with skill in the art will readily appreciate that the present invention may be implemented in a very wide variety of embodiments. This application is intended to cover any adaptations or variations of the embodiments discussed herein.
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/US2009/057176 | 9/16/2009 | WO | 00 | 3/3/2011 |
Number | Date | Country | |
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61099321 | Sep 2008 | US |