The present disclosure relates to an optical fiber connectors. More particularly, the disclosure is directed to a shroud for an optical fiber connector.
The mechanical tolerances involved in terminating single mode optical fiber are much tighter than those for multimode optical fiber. Therefore, while it is quite common for multimode optical fiber be terminated at the point of use, for example, at a user's premises or at an outside junction box, in most product applications, single mode optical fiber is not terminated in the field. When single mode fiber must be terminated in the field, then it can take a skilled technician between about 15 to 20 minutes to splice fibers together either by using a V-groove clamp or expensive fusion welding equipment.
Single mode fiber is therefore often provided in a range of different lengths, pre-terminated at both ends with a connector plug ready to plug into a matching receptacle. Commonly, eight or twelve single mode optical fibers may be bundled together in an optical fiber cable having an outer protective tube inside of which the optical fibers run.
An example of such a connector is the “Subscriber Connector,” or SC connector, originally developed by NTT®. SC connectors have convenient push/pull style mating, and are approximately square in cross-section and with a ceramic ferrule at the termination of the optical fiber cable, surrounded by a plastic housing for protection. The SC connector latches into a matching socket in a simple push motion. The push-pull design includes a spring against which the ferrule slides within a plastic inner housing. This arrangement provides a reliable contact pressure at the ferrule end and resists fiber end face contact damage of the optical fiber during connection. The connector can be quickly disconnected by first pulling back an outer housing, which is slidable relative to the inner housing, to disengage a latch inside socket between the socket and the inner housing, before pulling the optical fiber connector from the socket. Until the latch is thus disengaged, the latch prevents withdrawal of the connector when the optical fiber cable is pulled in a direction away from the socket.
As understood by persons skilled in the art, Telcordia maintains various product specifications for the telecom market. Regarding single-mode optical connectors, Telcordia GR-326 provides a performance specification for cable assemblies. Users of patchcords and cable assemblies frequently use GR-326 to specify basic performance requirements for connectors and connectorized cable assembly products.
Some conventional cables that are terminated with an SC connector may be made from a rigid polymer, which transfers a load applied to the end of a cable to the ceramic ferrule at the end of the SC connector, thereby resulting in insertion loss. Telcordia GR-326 requires a maximum insertion loss of 0.5 dB when a 1.0 kg, a 1.5 kg, and a 2.0 kg load are applied to the end of the cable.
It may be desirable to provide a shroud to interface between an SC connector and a bulkhead adapter to which the SC connector is coupled in order to reduce insertion loss when a load is applied to the end of the cable. As such, a shroud according to the present disclosure may provide a firmer, more solid connection that prevents movement of the SC connector when an applied load is attached to the end of the cable, thereby reducing insertion loss. It may also be desirable to provide a shroud that does not alter the connection between the SC connector and bulkhead adapter.
According to various aspects of the disclosure, a shroud includes a first end portion configured to slidingly receive a bulkhead adapter and a second end portion configured to slidingly receive an SC connector. The first end portion is configured to include an inner surface having ribs configured to engage an outer surface of the bulkhead adapter in an interference fit relationship, the second end portion is configured to include an inner surface having ribs configured to engage an outer surface of the SC connector in an interference fit relationship, dimensions of the inner surface of the first end portion are greater than corresponding dimensions of the inner surface of the second end portion, the shroud is configured to include an inner shoulder at an interface between the inner surface of the first end portion and the inner surface of the second end portion, the inner shoulder is configured to limit a depth of insertion of the bulkhead adapter into the first end portion of the shroud, a top wall of the inner surface of the second end portion of the shroud is configured to include a notch that extends a length of the second end portion, notch being configured to receive and permit passage of a protrusion extending from an outer surface of a top wall of the SC connector, the shroud is configured to permit the SC connector to be coupled directly with the bulkhead adapter in a push/pull engagement/disengagement relationship, and the shroud is configured to provide a connection between the SC connector and the bulkhead adapter that reduces insertion loss when a load is applied to an end of the cable at a boot end of the SC connector.
According to various aspects, a shroud includes a first end portion configured to slidingly receive a bulkhead adapter and engage an outer surface of the bulkhead adapter in an interference fit relationship and a second end portion configured to slidingly receive an SC connector and engage an outer surface of the SC connector in an interference fit relationship. The shroud is configured to include an inner shoulder configured to limit a depth of insertion of the bulkhead adapter into the first end portion of the shroud, the shroud is configured to permit the SC connector to be coupled directly with the bulkhead adapter in a push/pull engagement/disengagement relationship, and the shroud is configured to provide a connection between the SC connector and the bulkhead adapter that reduces insertion loss when a load is applied to an end of the cable at a boot end of the SC connector.
In some aspects, the first end portion is configured to include an inner surface having ribs configured to engage the outer surface of the bulkhead adapter in the interference fit relationship, and the second end portion is configured to include an inner surface having ribs configured to engage the outer surface of the SC connector in the interference fit relationship.
According to various aspects, dimensions of an inner surface of the first end portion are greater than corresponding dimensions of an inner surface of the second end portion, walls extend from the inner surface of the first end portion to the inner surface of the second end portion define an inner shoulder, and the inner shoulder is configured to limit a depth of insertion of the bulkhead adapter into the first end portion of the shroud.
In various aspects, the inner shoulder is at an interface between the inner surface of the first end portion and the inner surface of the second end portion.
In some aspects, a top wall of the inner surface of the second end portion of the shroud is configured to include a notch that extends a length of the second end portion, notch being configured to receive and permit passage of a protrusion extending from an outer surface of a top wall of the SC connector.
According to some aspects, the shroud provides an insertion loss of less than 0.5 dB when at least a 1.0 kg load is applied to the end of the cable.
In some aspects, the shroud provides an insertion loss of less than 0.5 dB when a 2.0 kg load is applied to the end of the cable.
According to various aspects, the shroud provides a firm connection between the SC connector and the bulkhead adapter that is more firm that a connection between the SC connector and the bulkhead adapter in the absence of the shroud.
In accordance with some aspects, a shroud includes a first end portion configured to slidingly receive a bulkhead adapter and a second end portion configured to slidingly receive an SC connector. The first end portion includes an inner surface configured to engage the bulkhead adapter in an interference fit relationship, the second end portion includes an inner surface configured to engage the SC connector in an interference fit relationship, and the shroud permits the SC connector to be coupled directly with the bulkhead adapter in a push/pull engagement/disengagement relationship.
In some aspects, the first end portion is configured to include an inner surface having ribs configured to engage the outer surface of the bulkhead adapter in the interference fit relationship, and the second end portion is configured to include an inner surface having ribs configured to engage the outer surface of the SC connector in the interference fit relationship.
According to various aspects, dimensions of an inner surface of the first end portion are greater than corresponding dimensions of an inner surface of the second end portion, walls extend from the inner surface of the first end portion to the inner surface of the second end portion define an inner shoulder, and the inner shoulder is configured to limit a depth of insertion of the bulkhead adapter into the first end portion of the shroud.
In various aspects, the inner shoulder is at an interface between the inner surface of the first end portion and the inner surface of the second end portion.
In some aspects, a top wall of the inner surface of the second end portion of the shroud is configured to include a notch that extends a length of the second end portion, notch being configured to receive and permit passage of a protrusion extending from an outer surface of a top wall of the SC connector.
According to some aspects, the shroud provides an insertion loss of less than 0.5 dB when at least a 1.0 kg load is applied to the end of the cable.
In some aspects, the shroud provides an insertion loss of less than 0.5 dB when a 2.0 kg load is applied to the end of the cable.
According to various aspects, the shroud provides a firm connection between the SC connector and the bulkhead adapter that is more firm that a connection between the SC connector and the bulkhead adapter in the absence of the shroud.
Embodiments of the invention will now be further described, by way of example only, and with reference to the accompanying drawings, in which:
The shroud 100 has a first end portion 112 and a second end portion 114 in an axial direction X of the shroud 100. The first end portion 112 includes an opening 116 configured to receive the bulkhead adapter 104, and the second end portion 114 includes an opening 118 configured to receive the SC connector 102. The first end portion 112 includes an inner surface 120 with ribs 122 extending inward from each of the top, bottom, and side walls 124, 125, 126, 127 of the inner surface 120 in a direction transverse to the axial direction. Similarly, the second end portion 114 includes an inner surface 130 with ribs 132 extending inward from each of the top, bottom, and side walls 134, 135, 136, 137 of the inner surface 130 in a direction transverse to the axial direction.
It should be appreciated that the dimensions of the inner surface 120 of the first end portion 112 are greater than the corresponding dimensions of the inner surface 130 of the second end portion 114. That is, a distance from side wall 126 to side wall 127 is greater than a distance from side wall 136 to side wall 137, and a distance from top wall 124 to bottom wall 125 is greater than a distance from top wall 134 to bottom wall 135. Further, the ribs 122 extend from the inner surface 120 of the first end portion 112 by a distance that defines an opening sized to provide an interference fit relationship between the ribs 122 and the outer surface 105 of the bulkhead adapter 104. Meanwhile, the ribs 132 extend from the inner surface 130 of the second end portion 114 by a distance that defines an opening sized to provide an interference fit relationship between the ribs 132 and the outer surface 103 of the SC connector 102.
As shown in
When the shroud 100 is coupled with the SC connector 102 and the bulkhead adapter 104, as illustrated in
It should be appreciated that the shroud 100 provides a connection between the SC connector 102 and the bulkhead adapter 104 that is effective is reducing insertion loss when a load is applied to an end of the cable 106, for example, at the boot end of the SC connector. The shroud 100 is effective in providing an insertion loss of less than 0.5 dB when a 1.0 kg, a 1.5 kg, and a 2.0 kg load are applied to the end of the cable, for example, at the boot end of the SC connector, as required to gain Telcordia GR-326 classification.
In some aspects, the shroud 100 may include scalloped notches 150 at the ends 152 of opposing side walls 154 of the first end portion 112 of the shroud 100. The cutouts 150 may correspond with the flanges 141 to accommodate the head of a screw (not shown), which can be used to attach the flanges 141 of the bulkhead adapter 104 to a structure (not shown). The second end portion 114 may include cutouts 160 at the ends 162 of opposing side walls 164 of the second end portion 114 of the shroud 100. The cutouts 160 may permit a user to determine whether the SC connector 102 is properly coupled with the bulkhead adapter 104 based on the portion of the SC connector 102 visible through the cutouts 160. Further, the cutouts 160 may permit a user to grasp the SC connector 102 for engagement and disengagement with the bulkhead adapter 104.
In use, in some aspects, the shroud 100 can be coupled with the bulkhead adapter 104, and then the SC connector 102 can be pushed through the shroud 100 and coupled with the bulkhead adapter 104. Alternatively, in some aspects, the SC connector 102 can first be pushed through the shroud 100. Then, the SC connector 102 can be coupled with the bulkhead adapter 104 and the shroud 100 can subsequently be coupled with the bulkhead adapter 104.
Referring now to
Referring to
Referring now to
Additional embodiments include any one of the embodiments described above, where one or more of its components, functionalities or structures is interchanged with, replaced by or augmented by one or more of the components, functionalities, or structures of a different embodiment described above.
It should be understood that various changes and modifications to the embodiments described herein will be apparent to those skilled in the art. Such changes and modifications can be made without departing from the spirit and scope of the present disclosure and without diminishing its intended advantages. It is therefore intended that such changes and modifications be covered by the appended claims.
Although several embodiments of the disclosure have been disclosed in the foregoing specification, it is understood by those skilled in the art that many modifications and other embodiments of the disclosure will come to mind to which the disclosure pertains, having the benefit of the teaching presented in the foregoing description and associated drawings. It is thus understood that the disclosure is not limited to the specific embodiments disclosed herein above, and that many modifications and other embodiments are intended to be included within the scope of the appended claims. Moreover, although specific terms are employed herein, as well as in the claims which follow, they are used only in a generic and descriptive sense, and not for the purposes of limiting the present disclosure, nor the claims which follow.
This nonprovisional application claims the benefit of U.S. Provisional Application No. 62/582,180, filed Nov. 6, 2017. The disclosure of the prior application is hereby incorporated by reference herein in its entirety.
Number | Name | Date | Kind |
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9733436 | Van Baelen | Aug 2017 | B2 |
Number | Date | Country | |
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20190179085 A1 | Jun 2019 | US |
Number | Date | Country | |
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62582180 | Nov 2017 | US |