Optical waveguides – With disengagable mechanical connector – Optical fiber/optical fiber cable termination structure
Reexamination Certificate
1998-11-02
2001-03-13
Ngo, Hung N. (Department: 2874)
Optical waveguides
With disengagable mechanical connector
Optical fiber/optical fiber cable termination structure
C385S059000, C385S134000, C385S065000, C385S083000
Reexamination Certificate
active
06200040
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to fiber optic connectors and more particularly to pin keepers for use in multiple fiber fiber optic connectors.
BACKGROUND OF THE INVENTION
A re-enterable fiber optic splice having complementary clam-shell halves joined on one side is known. An example of such a splice is disclosed in U.S. Pat. No. 5,121,456 in which the two complementary halves have a fiber-receiving channel for retaining a fiber and an aperture into which a tool may be inserted. The complementary halves function as a double cantilever spring clamp to hold the fiber in the fiber-receiving channel. The double cantilever spring permits installation of the fiber when the tool inserted in the aperture is used to overcome the clamping force of the spring clamps to slightly enlarge the diameter of the fiber-receiving channel. A re-enterable fiber optic splice for a dual fiber and multiple fiber ribbon using a similar tool for fiber installation is also known from U.S. Pat. Nos. 5,440,657 and 5,450,517.
The duplex fiber optic splice finds applications in the data communications area for premise wiring and fiber to the desk. For each communications device, for example a computer, there is one fiber for incoming data transfer and one fiber for outgoing data transfer. As users have come to expect, when networking a communications device, one plugs into a mating wall outlet or patch panel, a connector attached to a cable coming from the computer. The duplex configuration, therefore, is a logical grouping for a single reusable connection to a data communications device. Advantageously, known duplex fiber optic splices provide a re-enterable fiber optic termination with acceptable interconnection performance. Disadvantageously, the splices may be awkward to terminate because the fibers are not independently actuated. There is a need, therefore, for independently actuated fibers in a duplex splice.
As most buildings currently have copper based wiring and existing wall outlets and patch panels, it is desirable that a fiber optic termination device permit retrofitting of existing copper based connectors with fiber optic connectors. It is further desirable that installations require a minimum of time, effort, and likelihood of installation error. In order to address some of these needs, there is known a splice element having a mating connector at one end and the splicing termination at the other. Such a splicer-connector is disclosed in U.S. Pat. No. 5,367,594 for a simplex or single fiber connection in which a fiber stub is terminated in a ferrule. The ferrule is operatively associated with a coupling member capable of separable interconnection with a mating connector. The fiber stub is received within the splice assembly for splicing to a bare fiber. Advantageously, the splicer-connector that is disclosed in the '594 patent produces an optical fiber apparatus having a separable interface, wherein the optical fiber apparatus can be mechanically terminated in the field by a cleaved and unpolished fiber. The disclosed splicer-connector accommodates a single fiber providing a separable interconnection with a single fiber ferrule. There remains a need, however, for a mechanically terminated optical fiber connector that provides a separable interconnection with a fiber array ferrule.
Also known are fiber optic connectors using multiple fiber ferrules. Precision alignment between two mating multiple fiber ferrules is made through insertion of two precision guide pins into complementary guide pin holes. The relative position of the guide pins to fiber-receiving holes also in the ferrule is carefully controlled to provide sufficient fiber to fiber alignment for light transmission. Conventionally, the guide pins are held in a separate member called a pin keeper or guide pin stand-off, which is disposed at a nonmating end of the ferrule. The fibers that are terminated in the ferrule extend through the pin keeper unhindered to the rest of the connector. In the case where the fiber spacing upon exit of the ferrule is different than the fiber spacing required for the remainder of the connector, one of ordinary skill in the art appreciates that the distance and direction of fiber travel will occur where there are no forces on the fiber. Disadvantageously, this uncontrolled compensation that the fibers undergo, can damage the fiber or otherwise compromise its light transmissive properties. There is a need, therefore, for a mechanism by which the fibers can reliably change their lateral spacing.
SUMMARY OF THE INVENTION
It is an object of a fiber optic connector according to the teachings of the present invention that a mechanically terminated separable interconnection can be made to a fiber array ferrule.
It is an object of a fiber optic splice according to the teachings of the present invention that a fiber optic connector has a matable interface and can be installed with a minimum amount of time and effort and likelihood of error.
It is an object of a fiber optic connector according to the teachings of an embodiment of the present invention to provide a reliable and controlled shift from a first lateral fiber to fiber spacing to a second lateral fiber to fiber spacing.
A fiber optic subassembly comprises a multiple fiber ferrule holding at least two fibers, the ferrule having a fiber to fiber spacing substantially equal to a first lateral dimension. The subassembly further comprises a fiber optic body having a fiber to fiber spacing substantially equal to a second lateral dimension which is different from said first lateral dimension. A pin keeper is disposed between the ferrule and the fiber optic body. The fibers pass through the pin keeper, which splays the fibers from the first lateral dimension to the second lateral dimension.
It is a feature of a fiber optic splice according to the teachings of the present invention that a multiple fiber splice has independent fiber actuation.
It is an advantage of a splice according to the teachings of the present invention that a duplex configuration has independently actuated fibers.
It is an advantage of a fiber optic apparatus according to the teachings of an embodiment of the present invention that at least two fibers can reliably splay from a first lateral dimension to a second lateral dimension.
REFERENCES:
patent: 5121456 (1992-06-01), Essert et al.
patent: 5367594 (1994-11-01), Essert et al.
patent: 5434936 (1995-07-01), Nagaoka et al.
patent: 5440657 (1995-08-01), Essert
patent: 5450517 (1995-09-01), Essert
Briggs Robert Carl
Buchter Shelly Ann
Edwards Bryan Thomas
Erdman David Donald
Gallagher Rodney
Ngo Hung N.
Tyco Electronics
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