Multi-fiber ferrule with tapered transition into ferrule bore

Abstract

The present disclosure relates to a multi-fiber ferrule having a plurality of apertures, wherein each aperture has an adjacent partition that separates the aperture. The partitions also facilitate insertion of optical fibers into the respective apertures.

Description

[0001] Priority application

[0002] This application claims the benefit of priority to U.S. Provisional Application No. 63 / 399,814, filed on August 22, 2022, the contents of which are relied upon and incorporated herein by reference in their entirety. Technical Field

[0003] The present disclosure relates generally to optical fibers, and more particularly to ferrules for multi-fiber optical connectors, as well as optical connectors and cable assemblies including such ferrules, and methods related to these components. Background Art

[0004] Optical fiber is useful in a variety of applications, including the telecommunications industry for voice, video, and data transmission. In telecommunications systems that use optical fiber, fiber optic cables carrying the optical fibers are typically connected to equipment or other fiber optic cables at multiple locations. To facilitate these connections, optical connectors are often provided on each end of the fiber optic cable. The process of terminating the individual optical fibers from the fiber optic cable is called "connectorization." Connectorization can be done in a factory, producing a "pre-connectorized" or "pre-terminated" fiber optic cable, or in the field (e.g., using "field-installable" connectors).

[0005] There are many different types of optical connectors. In environments that require high-density interconnects and / or high bandwidth, such as data centers, multi-fiber connectors are the most widely used. An example is a multi-fiber push-on (MPO) connector, which contains a mechanical transmission (MT) ferrule and is standardized in accordance with TIA-604-5 and IEC 61754-7. These connectors can achieve very high fiber density, which reduces the amount of hardware, space, and labor used to establish a large number of interconnections.

[0006] Although MPO connectors are widely used in data center environments, there are still some challenges / problems that need to be solved. For example, inserting optical fibers into MPO connectors can be challenging. Ferrules for MPO connectors may have features that either (1) stop the optical fibers after being inserted into the ferrule, thereby not allowing the optical fibers to advance through the ferrule microholes, or (2) allow the optical fibers after being inserted into the ferrule to cross into adjacent ferrule microholes so that each ferrule microhole does not correspond to one optical fiber.

[0007] Additionally, securing the optical fiber in the ferrule of an MPO connector can also be a challenge. Adhesive materials are often used for this purpose, where the adhesive material is injected or otherwise supplied into the inner cavity of the ferrule. There must be enough adhesive material to ensure that the optical fiber is adequately bonded / secured to the ferrule. In order to avoid uncertainty as to whether a sufficient amount of adhesive material is provided, there may be a tendency to completely fill the inner cavity of the ferrule. However, doing so increases the likelihood that the adhesive material will be disposed on the exterior of the ferrule or otherwise leave the ferrule, both of which can interfere with the normal operation of the ferrule as part of the optical connector.

[0008] New multi-fiber ferrule and connector designs have been proposed, such as smaller multi-fiber ferrules and very small form factor connectors including such ferrules. However, fiber insertion and adhesion challenges still exist with respect to the structural features of these new ferrule designs.

[0009] Improvements over the above are desirable. Summary of the invention

[0010] The present disclosure relates to a multi-fiber ferrule having a plurality of holes, wherein each hole has adjacent partitions separating the holes. The partitions also facilitate insertion of optical fibers into each hole.

[0011] In one embodiment, a ferrule for an optical connector is configured to receive a plurality of optical fibers. The ferrule includes: a body having a front end and a rear end, the body extending in a longitudinal direction between the front end and the rear end; a plurality of holes extending from the front end toward the rear end into the body, wherein each hole is configured to receive one of the plurality of optical fibers; a plurality of tapered partitions, wherein each tapered partition has: a first end adjacent to a corresponding hole in the plurality of holes and a second end adjacent to the rear end of the ferrule; a cross-sectional shape at the first end that spans the periphery of the corresponding hole so that each of the plurality of holes is separated from each other; and a tapered surface from the second end to the first end.

[0012] In another embodiment, the rear end of the ferrule includes a mark, whereby the mark provides a visual indication of the horizontal alignment of the plurality of optical fibers within the plurality of holes of the ferrule. In another embodiment, the mark extends from the rear end of the ferrule to the second end of the tapered partition. In another embodiment, the tapered partition has a height H1 at the first end and a height H2 at the second end, wherein the height ratio H2:H1 ranges between 1.2:1 and 3:1. In another embodiment, the tapered partition has a width W1 at the first end and a width W2 at the second end, wherein the width ratio W2:W1 ranges between 1.2:1 and 3:1. In another embodiment, the tapered partition has a circular cross-section at the first end and a square cross-section at the second end. In another embodiment, the tapered surface of the tapered partition has an angle relative to the longitudinal axis of one of the holes ranging between 15° and 45°. In another embodiment, adjacent tapered partitions have corresponding adjoining tapered surfaces, the adjoining tapered surfaces forming an edge, wherein the edge is configured to prevent the optical fiber from being inserted into a non-corresponding hole. In another embodiment, the second end of the tapered partition is flush with the rear end of the ferrule. In another embodiment, the plurality of holes includes a first row of holes and a second row of holes separated from the first row of holes, wherein the first row of holes are coplanar with each other, and the second row of holes are coplanar with each other. In another embodiment, the first row of holes and the second row of holes are separated by a partition that is flush with the rear end of the ferrule, wherein the partition is formed integrally with the ferrule. In another embodiment, the ferrule further includes a window formed on the top surface or the bottom surface of the ferrule, wherein the window extends into the lead-in section of the ferrule adjacent to the tapered partition.

[0013] In another embodiment, an optical connector comprises: a ferrule according to any one of the preceding embodiments; and a plurality of optical fibers fixed to the ferrule, wherein each optical fiber extends from the rear end of the body and extends into one of the micro-holes. In another embodiment, the plurality of holes comprises a first row of holes and a second row of holes spaced apart from the first row of holes, wherein the first row of holes are coplanar with each other and the second row of holes are coplanar with each other. In another embodiment, the plurality of optical fibers comprises a first ribbon of optical fibers and a second ribbon of optical fibers, wherein the first ribbon of optical fibers and the second ribbon of optical fibers are coplanar with each other; and wherein the first ribbon of optical fibers and the second ribbon of optical fibers are separated by a fiber spacer; wherein the first ribbon of optical fibers, the second ribbon of optical fibers and the fiber spacer are inserted into the rear end of the ferrule so that the first ribbon of optical fibers is inserted into the first row of holes and the second ribbon of optical fibers is inserted into the second row of holes. In another embodiment, the first row of holes and the second row of holes are separated by a spacer that is flush with the rear end of the ferrule, and wherein the spacer is formed integrally with the ferrule. In another embodiment, the plurality of optical fibers includes a first ribbon of optical fibers and a second ribbon of optical fibers, wherein the first ribbon of optical fibers and the second ribbon of optical fibers are coplanar with each other; and wherein the first ribbon of optical fibers and the second ribbon of optical fibers are inserted into the rear end of the ferrule such that the first ribbon of optical fibers is inserted into the first row of holes and the second ribbon of optical fibers is inserted into the second row of holes.

[0014] In another embodiment, a method of terminating a plurality of optical fibers with a ferrule as in any of the preceding embodiments comprises: aligning the optical fibers with the holes of the ferrule; and extending the optical fibers through the rear end of the ferrule and into the holes, wherein the tapered partition is arranged so that one optical fiber extends through each of the holes. In another embodiment, the aligning step comprises: aligning a first ribbon of optical fibers with the first row of holes; and aligning a second ribbon of optical fibers with the second row of holes. In another embodiment, aligning the first ribbon of optical fibers comprises aligning the optical fibers in the first ribbon with markings on the rear end of the ferrule; and wherein aligning the second ribbon of optical fibers comprises aligning the optical fibers in the second ribbon with markings on the rear end of the ferrule. In another embodiment, the first ribbon of optical fibers and the second ribbon of optical fibers are separated by a fiber spacer, which is inserted into the ferrule together with the first ribbon of optical fibers and the second ribbon of optical fibers. In another embodiment, the method further comprises: supplying an adhesive into the tapered partition. In another embodiment, the adhesive is supplied into the holes through a window formed in the top surface of the ferrule and extending into a lead-in section of the ferrule adjacent to the tapered partition.

[0015] Additional features and advantages will be set forth in the detailed description that follows and will be readily apparent to those skilled in the art of optical communication technology to some extent. It will be understood that the above general description, the following detailed description, and the accompanying drawings are merely illustrative and are intended to provide an overview or framework for understanding the nature and character of the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are included to provide further understanding, and are incorporated into and constitute a part of this specification. The accompanying drawings illustrate one or more embodiments and, together with the description, serve to clarify the principles and operations of the various embodiments. The features and properties associated with any embodiment shown or described may also be applicable to other embodiments shown, described, or understood based on the present disclosure.

[0017] Figure 1 is a perspective view of an example of an optical connector;

[0018] Figure 2 yes Figure 1 An exploded perspective view of an optical connector;

[0019] Figure 3 According to the present disclosure, Figure 1 A front perspective view of a ferrule in an optical connector;

[0020] Figure 4 yes Figure 3 A rear perspective view of a ferrule;

[0021] Figure 5 yes Figure 4 A rear enlarged view of the ferrule;

[0022] Figure 6 yes Figure 5 A cross-sectional perspective view of a ferrule;

[0023] Figure 7 is a rear perspective view of an alternative embodiment of a ferrule according to the present disclosure;

[0024] Figures 7A-7C is a cross-sectional view of the ferrule and optical fiber of the present disclosure, illustrating the location of the adhesive

[0025] Fig. 8A According to the present disclosure, before inserting the optical fiber into the ferrule Figure 3 A rear perspective view of a ferrule;

[0026] Figure 8B According to the present disclosure, after the optical fiber is inserted into the ferrule Fig. 8A A rear perspective view of a ferrule;

[0027] Fig.9A According to the present disclosure, before inserting the optical fiber into the ferrule Figure 3 A rear perspective view of an alternative embodiment of the ferrule; and

[0028] Fig. 9B According to the present disclosure, after the optical fiber is inserted into the ferrule Fig. 8A A rear perspective view of a ferrule;

[0029] Fig.10 is an exploded view of a ferrule of the present disclosure and a converter coupled to the ferrule according to the present disclosure;

[0030] Fig.11 yes Fig.10 A stereoscopic view of a ferrule and a converter, wherein the ferrule and the converter are connected together;

[0031] Fig.12 yes Fig.11 A cross-sectional view of the connected ferrule and converter;

[0032] Fig.13 yes Fig.11 A rear view of the connected ferrule and converter;

[0033] Fig.14 is a perspective view of an alternative embodiment of a converter coupled to a ferrule according to the present disclosure;

[0034] Fig.15 yes Fig.13 A cross-sectional view of the connected ferrule and converter; and

[0035] Fig.16 yes Fig.13 Rear perspective view of the ferrule and converter. DETAILED DESCRIPTION

[0036] In the following description, different embodiments will be further illustrated by examples. In general, the present specification relates to a multi-fiber ferrule and an optical fiber connector and a cable assembly including such a multi-fiber ferrule. Specifically, the present disclosure relates to a multi-fiber ferrule having a plurality of holes, wherein each hole has an adjacent partition separating the holes. The partition also facilitates the insertion of an optical fiber into each hole.

[0037] The optical fiber connector can be based on a known connector design, such as an MPO connector. Figure 1 and Figure 2 The diagram shows The optical fiber connector 10 (also referred to as an "optical connector" or simply a "connector") in the form of a connector, The connector is a specific type of MPO connector ( is a trademark of US Conec Ltd.). A brief overview of connector 10 will be provided to facilitate discussion, as the multi-fiber ferrules and other components shown in subsequent figures may also be used in conjunction with connectors of the same type as connector 10. However, those skilled in the art of optical connections will understand that connector 10 is merely an example, and the general principles disclosed in connection with the multi-fiber ferrules and other components shown in subsequent figures may also be applicable to other connector designs.

[0038] like Figure 1 As shown in FIG. 1 , the connector 10 can be installed on a fiber optic cable 12 (“cable”) to form a fiber optic cable assembly 14. The connector includes a ferrule 16, a housing 18 received on the ferrule 16, a slider 20 received on the housing 18, and a jacket 22 received on the cable 12. The ferrule 16 is spring biased within the housing 18 so that a front portion 24 of the ferrule 16 extends beyond a front end 26 of the housing 18. As discussed in more detail herein, the ferrule 16 is also coupled to a converter 80 to increase the size of the ferrule 16 so that the ferrule 16 is compatible in a particular connector configuration. An optical fiber (not shown) carried by the cable 12 extends through a micro-hole or hole 25 in the ferrule 16 before terminating at or near an end face 30 of the ferrule 16. The optical fiber is fixed within the ferrule 16 using an adhesive material (e.g., epoxy) and can be presented for optical fiber connection with a mating component (e.g., another fiber optic connector; not shown) when the housing 20 is inserted into an adapter, a receptacle, or the like.

[0039] like Figure 2 As shown in FIG. 1 , the connector 10 further includes a ferrule boot 32, a guide pin assembly 34, a spring 36, a crimp body 38, and a crimp ring 40. The ferrule boot 32 is received in the rear portion 42 of the ferrule 16 to help support the ferrule hole 25 ( Figure 3 ) of the optical fiber. The guide pin assembly 34 includes a pair of guide pins 44 extending from a pin holder 46. Features on the pin holder 46 cooperate with features on the guide pins 44 to retain portions of the guide pins 44 within the pin holder 46. When the connector 10 is assembled, the pin holder 46 is positioned against the rear surface of the ferrule 16, and the guide pins 44 extend through the pin holes 31, 33 ( Figure 3 ) thereby protruding beyond the front end face 30.

[0040] Both the ferrule 16 and the guide pin assembly 34 are biased to a forward position relative to the housing 18 by the spring 36. More specifically, the spring 36 is positioned between the pin retainer 46 and a portion of the crimp body 38. When the connector 10 is assembled, the crimp body 38 is inserted into the housing 18 and includes a latch arm 50 that engages a recess 52 in the housing. The spring 36 is compressed at this point and applies a biasing force to the ferrule 16 via the pin retainer 46. The rear portion 42 of the ferrule defines a flange that interacts with a shoulder or stop formed in the housing 18 to retain the rear portion 42 in the housing 18.

[0041] In a manner not shown in the drawings, aramid yarn or other strength member from the cable 12 is attached to the end portion 54 of the crimp body 38 that protrudes rearwardly from the housing 18 and is positioned. The aramid yarn is secured to the end portion 54 by a crimp ring 40 that is attached to the end portion 54 and slides and deforms after the aramid yarn is positioned. The jacket 22 covers this area, as shown in FIG. Figure 1, and provides strain relief for the optical fiber by limiting the extent to which the connector 10 can be bent relative to the cable 12.

[0042] Now that a general overview of connector 10 has been provided, the ferrule design will be described. To this end, Figure 3 and Figure 4 The ferrule 16 to be used according to the connector 10 is illustrated. The ferrule 16 is shown as a micro MT ferrule that is smaller than a conventional MT ferrule. A similar ferrule is disclosed in WO2021217050A1, the disclosure of which is incorporated by reference. However, the ferrule 16 shown is merely an illustrative example, and aspects of the present disclosure may also be applied to conventional MT ferrules or other multi-fiber ferrule designs for MPO connectors.

[0043] The ferrule 16 includes a ferrule body 17 extending in a longitudinal direction (ie, along a longitudinal axis L) between a front end 19 and a rear end 21 of the ferrule body 17. The front end 19 of the ferrule body 17 defines an end face 23 where a micro-aperture 25 is included.

[0044] like Figure 3 As shown in FIG. 1 , the ferrule 16 includes a first group 27 and a second group 29 of microholes 25 extending from the front end 19 into the ferrule body 17, wherein the microholes 25 of group 27 are coplanar with each other—plane P1, and the microholes 25 of group 29 are coplanar with each other—plane P2. Each microhole 25 is configured to receive an optical fiber 67 ( Figures 7A-7C ). In the illustrated embodiment, twelve micro-holes 25 are provided in each of the first group 27 and the second group 29. However, it is within the scope of the present disclosure that alternative groups and numbers of micro-holes 25 may also be used with respect to the ferrule 16 (e.g., 12 micro-holes in a row, etc.). The ferrule 16 also includes a recessed portion 28 on the top surface 32 of the ferrule 16. Specifically, as shown, the recessed portion 28 is defined by a crosspiece A on the top surface TS of the ferrule 16. As discussed in more detail herein, the crosspiece A is configured to be coupled to the converter 80 to form the ferrule assembly 70. The recessed portion 28 and the crosspiece A are also provided on the bottom surface BS of the ferrule 16. However, it is within the scope of the present disclosure that in alternative embodiments, the crosspiece A and the recessed portion 28 may also be provided separately on the top surface TS or the bottom surface BS.

[0045] The ferrule 16 also includes pin holes 31, 33, which are configured to receive guide pins when the ferrule 16 is installed in the connector 10. Figure 3 and Figure 4In the embodiment, as shown, the pin holes 31, 33 are empty, so that this embodiment represents a female configuration of the ferrule 16. For a male configuration, a corresponding guide pin can be received in the pin holes 31, 33 and can protrude beyond the front end 19 of the ferrule 16. Although two pin holes 31, 33 are shown in the drawings, any number of pin holes 31, 33 can be provided in alternative embodiments.

[0046] Reference now Figure 4 and Figure 5 , the rear end 21 of the ferrule 16 is shown, wherein the rear end 21 includes an introduction section 35 that provides access to a hole 37 in the ferrule body 17, the hole extending to the front end 19 of the ferrule 16. In some embodiments, the hole 37 includes a micro-hole 25 that extends from the front end 19 of the ferrule 16 into the ferrule body 17. Specifically, briefly refer to Figure 6 , the holes 37 are adjacent to the microholes 25, and as shown, each of the holes 37 has a larger diameter than the microholes 25. Moreover, in some embodiments, the diameter of the holes 37 may increase as the holes 27 approach the rear end 21, as shown. However, it is also within the scope of the present disclosure that the holes 37 have a consistent diameter within the ferrule body 17 of the ferrule 16. As previously mentioned, there are two groups 27, 29 of microholes 25, and therefore, there are two groups 27, 29 of holes 37 corresponding to the groups of microholes 25. The groups 27, 29 are separated by a spacer 39. The spacer 39 is configured to separate the groups 27, 29 of holes 37 to facilitate insertion of optical fibers into the holes 37. Specifically, the spacer 39 prevents the optical fibers 67 ( Figures 7A-7C ) or the optical fiber ribbons 59, 61 (FIGS. 8 and 9) are inserted into the incorrect group of holes 37. In some embodiments, the spacer 39 is integrally formed with the ferrule 16 and is flush with the rear end 21. However, in alternative embodiments, the spacer 39 is not included in the design of the ferrule 16. In another alternative embodiment, the spacer 39 is included in the lead-in section 35 of the ferrule 16 and is integrally formed with the ferrule 16, but the spacer 39 is not flush with the rear end 21 of the ferrule 16. Additional details regarding the rear end 21 of the ferrule 16 will be discussed in more detail below.

[0047] Reference now Figure 5, an enlarged view of the lead-in section 35 of the rear end 21 is shown. As previously mentioned, the lead-in section 35 provides access to the hole 37 in the ferrule 16. As shown, the lead-in section 35 includes a channel 45 and an orifice 47 extending from the rear end 21 of the ferrule 16 to the tapered divider 49. In some embodiments, the lead-in section 35 includes only the orifice 47, wherein the tapered divider 49 is flush with the orifice 47 and is not provided with a channel. In some embodiments, the orifice 47 of the lead-in section 35 is flush with the rear end 21. In some embodiments, the orifice 47 is recessed relative to the rear end 21. The orifice 47 provides access to the tapered divider 49 and is shaped to surround the hole 37 and the tapered divider 49. The orifice 47 also includes at least one marking 51. The marking 51 is configured to provide an installer with a reference when installing the optical fiber ribbon 59, 61 (Figures 8 and 9) or the optical fiber 67 ( Figures 7A-7C ). Specifically, the mark 51 provides a visual indicator for horizontally aligning the optical fiber 67 or the optical fiber ribbon 59, 61 within the aperture 47. In addition, the mark 51 can extend to the tapered divider 49 and the hole 37 so that the mark 51 is aligned with the center C of the hole 37. In this configuration, the mark 51 also provides a visual indicator for aligning the end fibers of the optical fiber ribbon 59, 61 so that the end optical fibers of the optical fiber ribbon 59, 61 are aligned with the end hole 37. In some embodiments, the mark 51 is an indentation on the rear end 21 of the ferrule 16. In some embodiments, the mark 51 is a protrusion on the rear end 21 of the ferrule 16. In some embodiments, as shown, the mark 51 includes a marker extending from one of the apertures 47 along the rear end 21 toward the top surface or bottom surface of the ferrule 16, wherein the marker includes a portion of the rear end 21. In some embodiments, as also shown, the mark 51 includes a marker that spans from one of the apertures 47 and extends to the top surface or bottom surface or both of the ferrule 16.

[0048] When the optical fiber 67 or optical fiber ribbon 59, 61 is inserted into the aperture 47, the optical fiber engages with the tapered partition 49 before entering the hole 37. Figure 5 and Figure 6 The tapered partition 49 is configured to provide a physical barrier so that the optical fiber is guided into the corresponding hole 37 and avoids the crossing of the optical fibers. As used herein, the crossing of the optical fibers refers to the situation where the optical fiber 67 corresponding to a specific hole 37 "crosses" into another hole 37 that does not correspond to the optical fiber.

[0049] As shown, the tapered divider 49 includes a first end 43 adjacent to the hole 37 and a second end 53 near the rear end 21, with a tapered surface 55 spanning from the first end 43 to the second end 53. At the first end 43, the tapered divider 49 has a cross-sectional shape that is coaxial with the longitudinal axis L1 of the hole 37. In other words, the cross section of the tapered divider 49 at the first end 43 spans the periphery of the hole 37 and is coaxial with the hole 37. In some embodiments, the cross-sectional shape of the tapered divider 49 at the first end 43 is circular, wherein the cross section is coaxial with the hole 37. However, it is also within the scope of the present disclosure that in alternative embodiments, alternative suitable cross-sectional shapes may also be used. In some embodiments, the tapered divider 49 has a length L2 that is less than 250 microns.

[0050] As shown, at the first end 43, the tapered divider 49 has a height H1 ranging between 100 microns and 250 microns, between 100 microns and 150 microns, or between 125 microns and 150 microns. The tapered divider 49 also has a width W1 ranging between 100 microns and 250 microns, between 100 microns and 150 microns, or between 100 microns and 125 microns at the first end 43. In some embodiments, the first end 43 of the tapered divider 49 is adjacent to the hole 37 of the ferrule 16.

[0051] At the second end 53, the tapered divider 49 has a cross-sectional shape that is coaxial with the longitudinal axis LI of the hole 37. In other words, the cross section of the tapered divider 49 at the second end 53 spans the periphery of the hole 37 and is coaxial with the hole 37. In some embodiments, the cross-sectional shape of the tapered divider 49 at the second end 53 is square, wherein the cross section is coaxial with the hole 37. However, it is also within the scope of the present disclosure that in alternative embodiments, alternative suitable cross-sectional shapes may be used. As shown, at the second end 53, the tapered divider 49 has a height H2 ranging between 200 microns and 800 microns, between 200 microns and 500 microns, or between 200 microns and 250 microns. The tapered divider 49 also has a width W2 ranging between 150 microns and 350 microns at the second end 53. In some embodiments, the width W2 of the tapered divider 49 is equal to the pitch between the holes 37. As used herein, "pitch" refers to the distance from the center of one hole 37 to the center of another adjacent hole 37. In some embodiments, the second end 53 of the tapered partition 49 is located within the lead-in section 35. In some embodiments, the second end 53 of the tapered partition 49 is flush with the rear end 21 of the ferrule 16.

[0052] In some embodiments, a height ratio H2:H1 from the second end 53 to the first end 43 ranges between 1.2:1 and 3:1. In some embodiments, a width ratio W2:W1 from the second end 53 to the first end 43 ranges between 1.2:1 and 3:1.

[0053] As previously mentioned, the tapered surface 55 is disposed between the first end 43 and the second end 53 of the tapered partition 49. The tapered surface 55 connects the first end 43 of the tapered partition 49 to the second end 53, and the tapered surface 55 is angled relative to the longitudinal axis LI of the hole 37 and is configured to guide the inserted optical fiber into the hole 37. Specifically, when the optical fiber 67 is inserted through the second end 53 of the tapered partition 49, the optical fiber 67 may be eccentric relative to the corresponding center C of the hole 37 and contact one of the tapered surfaces 55. The tapered surface 55 then guides the optical fiber 67 into the hole 37 as the optical fiber 67 is further advanced within the hole 37. In some embodiments, the tapered surface 55 has an angle θ ranging between 15° and 45°. Having an inclined tapered surface as shown provides the advantage of a softer vertical wall, wherein the optical fiber 67 eccentric to the center C of the hole 37 is guided into alignment as the optical fiber 67 advances through the ferrule 16. This configuration facilitates insertion of the optical fiber into the bore 37 and improves installation time because the optical fiber is guided into the bore 37. This is in contrast to previous ferrule configurations in which vertical walls substantially perpendicular to the longitudinal axis L1 are provided. Such vertical walls provide a hard stop for the optical fiber 67 and may damage the inserted optical fiber 67 if they contact the optical fiber or impede installation of the optical fiber 67, thereby increasing installation time.

[0054] As discussed below, the tapered surface 55 is also configured to prevent lateral misalignment of the optical fiber. In other words, the tapered surface 55 provides a physical barrier to the inserted optical fiber to prevent the optical fiber from crossing into the non-corresponding hole 37. This feature of the tapered surface 55 enables the optical fiber 67 to be accurately positioned with the corresponding hole 37 in the ferrule 16.

[0055] Specifically, adjacent tapered partitions 49 have corresponding adjacent tapered surfaces 55, and as shown in FIG. Figure 5 As shown in , adjacent tapered surfaces 55 converge to form an edge 56 at the second end 53. The edge 56 is configured to prevent the optical fiber 67 from being laterally misplaced into a non-corresponding hole. In other words, the edge 56 is configured to prevent the optical fibers from crossing. The edge 56 also allows a passive transverse optical fiber to be inserted into a corresponding hole, whereby an optical fiber 67 that is not aligned with a corresponding hole 37 can contact the edge 56 and the corresponding tapered surface 55, which guides the optical fiber 67 into the corresponding hole 37. In some embodiments, the edge 56 can be a pointed edge, where the tapered surfaces 55 converge to form a straight edge. In some embodiments, the edge 56 can be a rounded edge, where the tapered surfaces 55 converge to form a rounded edge with a radius of curvature.

[0056] Reference now Figure 7 , an alternative embodiment of the ferrule 16 is shown. As shown, the ferrule 16 has a single row of coplanar holes 37 and includes a tapered divider 49 as discussed above. The ferrule 16 also includes a window 63 on the ferrule body 17. Specifically, the window 63 is provided on the top side of the ferrule body 17. However, in an alternative embodiment, the window 63 is provided on the bottom side of the ferrule body 17. In an alternative embodiment, the window 63 is provided on the top side and the bottom side of the ferrule body 17, as shown in FIG. Figure 7B . Window 63 provides access to the inserted optical fiber and enables an operator to view the inserted optical fiber to ensure that the corresponding optical fiber 67 is guided to the corresponding hole 37. In addition, window 63 provides access to the interior of ferrule 16 so that after the optical fiber is inserted, adhesive can be inserted into ferrule 16 and hole 37, as discussed below. Adhesive 65 is configured to couple the optical fibers 67 within ferrule 16 to form a connector assembly.

[0057] Brief reference Figures 7A-7C , various examples of placing adhesive 65 in the insert 16 and / or the lead-in section 35 are shown. Fig. 7A , adhesive 65 is injected into hole 37 and micro-hole 25 through introduction section 35. As shown, adhesive 65 is in place substantially throughout the length of hole 37 and micro-hole 25, wherein a portion of adhesive 65 is in place beyond the rear end of hole 37 and into tapered partition 49. When optical fiber 67 is inserted into introduction section 35, tapered partition 49 and hole 37, optical fiber 67 is inserted through ferrule 16 and adhesive 65. In another embodiment, referring to Figure 7B , adhesive 65 is injected through window 63 of ferrule 16, wherein adhesive 65 is in place adjacent second end 53 of tapered partition 49. In this embodiment, optical fiber 67 is inserted through lead-in section 35, through adhesive 65, and into bore 37, wherein adhesive 65 is on the outer surface of optical fiber 67. In another embodiment, optical fiber 67 is inserted into lead-in section 35 and bore 37 of ferrule 16 with adhesive 65 on the outer surface of optical fiber 67, as shown in FIG. Figure 7C as shown in . Figures 7A-7C is an illustrative example of how to apply adhesive 65 to optical fiber 67 and within ferrule 16. However, it is also within the scope of the present disclosure that alternative ferrule processing techniques for promoting better adhesion between optical fiber 67 and ferrule 16 may also be used, such as, for example, laser etching / laser processing of lead-in section 35 of ferrule 16, etc. (e.g., plasma processing, etc.).

[0058] Reference now Fig. 8A and Figure 8B , the method of inserting the optical fiber ribbons 59, 61 into the ferrule 16 is shown. Fig. 8A, a ferrule 16 is provided wherein a spacer 39 separates the two rows of holes 37, as shown, and the spacer 39 is integrally formed with the ferrule 16. However, the spacer 39 is not flush with the rear end 21 of the ferrule 16, as shown. Instead, the spacer 39 is positioned within the lead-in section 35. Now referring to Figure 8B , the optical fiber ribbons 59 and 61 are inserted into the lead-in section 35 to align with the two rows of holes 37. To this end, the end optical fibers of the optical fiber ribbons 59, 61 are aligned with the marks 51 on the rear end of the ferrule 16 to ensure that the end fibers of the optical fiber ribbons 59, 61 are aligned with the correct fibers of the corresponding holes 37. As shown, since the spacers 39 are in the lead-in section 35, the optical fiber ribbons 59, 61 are inserted into the lead-in section 35 in a manner in which the optical fiber spacers 57 are positioned between the optical fiber ribbons 59, 61. With respect to the misalignment of the optical fibers between the groups (i.e., the optical fiber 67 for the first hole 37 of the group 27 is inserted into the hole 37 of the second group 29, etc.), the optical fiber spacers 57 are configured to align with the spacers 39 of the ferrule 16 so that the optical fiber ribbons 59, 61 can be aligned with the first group 27 and the second group 29 of the holes 37, respectively. Then, after being inserted into the introduction section 35, the optical fiber ribbons 59, 61 engage with the corresponding tapered partitions 49, which guide the optical fibers of the optical fiber ribbons 59, 61 into the corresponding holes 37. The optical fibers of the optical fiber ribbons 59, 61 are then advanced through the holes 37 and through the micro-holes 25 to the front end 19 of the ferrule 16.

[0059] Reference now Fig.9A and Fig. 9B , an alternative method of inserting the optical fiber ribbons 59, 61 into the ferrule 16 is shown. Fig.9A , the ferrule 16 is provided, wherein a spacer 39 separates the two rows of holes 37, as shown. The spacer 39 is integrally formed with the ferrule 16 and is flush with the rear end 21 of the ferrule 16. Now referring to Fig. 9B , the optical fiber ribbons 59 and 61 are inserted into the corresponding apertures 47, as shown, so that the optical fiber ribbons 59, 61 correspond to the first group 27 and the second group 29 of the holes 37. To this end, the end optical fibers of the optical fiber ribbons 59, 61 are aligned with the markings 51 on the rear end of the ferrule 16 to ensure that the end fibers of the optical fiber ribbons 59, 61 are aligned with the correct fibers of the corresponding holes 37. Then, after being inserted into the introduction section 35, the optical fiber ribbons 59, 61 engage with the corresponding tapered dividers 49, which guide the optical fibers of the optical fiber ribbons 59, 61 into the corresponding holes 37. The optical fibers of the optical fiber ribbons 59, 61 are then advanced through the holes 37 and through the micro-holes 25 to the front end 19 of the ferrule 16.

[0060] In some embodiments, the ferrule 16 as described is not sized for use as an MPO connector ferrule. In other words, the ferrule 16 may be shorter and / or thinner than a standard ferrule in an MPO connector, such that the ferrule 16 may be incompatible with devices designed for conventional MPO connectors. To address this challenge, the converter 80 is coupled to the ferrule 16 so that the form factor of the resulting assembly is similar to that of a conventional MT ferrule for an MPO connector. Although MPO connectors are mentioned in the above disclosure, it is also within the scope of the present disclosure that the concept may also be used in other suitable connector applications.

[0061] Reference now Figure 10-13 , a ferrule assembly 70 is shown. The ferrule assembly 70 includes the ferrule 16 as described above and a converter 80. As shown, the converter 80 includes a front end 81, a rear end 83 and a converter body 85.

[0062] The converter body 85 includes an opening 87 extending between the front end 81 and the rear end 83 and defined by the converter body 85. The opening 87 is configured to receive the ferrule 16 between the front end 81 and the rear end 83 within the converter body 85. The converter body 85 also includes a retaining wedge 89 and side surfaces 91, 92 extending from a top section 93 and a bottom section 95 of the converter body 85 and extending into the opening 87. The retaining wedge 89 and the side sections 91, 92 cooperate to retain the ferrule 16 within the converter 80.

[0063] The retaining wedge 89 is configured to engage with the crosspiece A and extend into the recessed portion 28 when the ferrule 16 is coupled to the converter 80. Specifically, to secure the ferrule 16 to the converter 80, the ferrule 16 is advanced in the direction A1 such that the rear end 21 is advanced first into the opening 87. The ferrule 16 continues to advance in the direction A1 until the crosspiece A is advanced further inward (toward the rear end 83 of the converter 85) than the retaining wedge 85. At this point, the retaining wedge 89 extends into the recessed portion 28 of the ferrule 16, and the vertical surface 90 of the retaining wedge 89 engages with the crosspiece A to hold the ferrule 16 in place and constrain movement in the z direction as defined in the Cartesian coordinate system of the drawings.

[0064] As previously mentioned, the retaining wedge 89 and the side portions 91, 92 cooperate to retain the ferrule within the converter 80. Specifically, the side surfaces 91, 92 extend from the front end 81 of the converter 80 toward the rear end 83 of the converter 80. The side portions 91, 92 each include a corresponding surface 91A, 92A that is configured to correspond to the beveled edges 71, 72 of the ferrule 16; the surfaces 91A, 92A are spaced apart from each other by a width W that corresponds to the width of the ferrule 16. As shown, the surfaces 91A, 92A are angled relative to the longitudinal axis L, and the surfaces 91A, 92A are inclined such that the angle is the same as the angle of the beveled edges 71, 72 relative to the longitudinal axis L. By having the same angle and being spaced apart by the width W, the side portions 91, 92 can accommodate the insertion of the ferrule 16 into the converter 80 along the direction A1, whereby the surfaces 91A, 92A contact the beveled edges 71, 72 of the ferrule 16 and exert a force on the inserted ferrule 16. In this manner, the side surfaces 91 , 92 exert forces along the xy plane that cooperate with the physical structure of the transducer 80 to restrict movement of the ferrule 16 along the xy plane as defined in the Cartesian coordinate system of the drawings.

[0065] Brief reference Fig.11 , when the ferrule 16 is inserted into the converter 80, the end face 30 of the ferrule 16 can protrude outward from the front end 81 of the converter 80. Advantageously, such outward protrusion enables the inserted optical fiber 67 and the end face 30 to be polished without interfering with the converter 80. The polishing of the end face 30 can help achieve physical contact between the inserted optical fiber 67 of the mated connector 10 by changing the geometry of the end face 30 so that the angle between the end face 30 and the inserted optical fiber 67 is improved. It is also within the scope of the present disclosure that in alternative embodiments, the ferrule 16 can be recessed within the converter 80, or the end face 30 of the ferrule 16 can be flush with the front end 81 of the converter 80.

[0066] The converter 80 also includes pin holes 93, 95 that correspond to the pin holes 31, 33 of the ferrule 16 when the ferrule 16 is inserted into the converter 80. The pin holes 93, 95 are configured to align with the pin holes 31, 33 of the ferrule 16 and extend the length of the pin holes 31, 33 to the rear end 83 of the converter 80. In this way, when the ferrule 16 is installed in the converter 80 and the connector 10, the pin holes 31, 33 can receive the guide pins.

[0067] Brief reference Fig.13 , a rear view of the ferrule assembly 70 is shown. As shown, the converter 80 also includes a lead-in portion 97 extending from the rear end 83 of the converter 80 into the opening 87 of the converter 80. The lead-in portion 97 is configured to provide access to the rear end 21 of the ferrule 16 and the corresponding lead-in section 35 when the optical fiber 67 is inserted into the ferrule assembly 70.

[0068] In order to fix the converter 80 to the ferrule 16, and referring to Fig.10 , the ferrule 16 is first advanced in the direction A1 within the opening 87 of the converter 80, so that the rear end 21 is close to the introduction portion 97 of the converter 80. When the ferrule 16 is advanced in the direction A1, the ferrule 16 engages with the fixing wedge 89 of the converter 80. Specifically, the vertical surface 90 of the fixing wedge 89 engages with the crosspiece A of the ferrule 16, so that the ferrule 16 and the converter 80 are in snap-fit ​​engagement to form the ferrule assembly 70.

[0069] After assembling the ferrule assembly 70, the optical fiber 67 is inserted through the lead-in portion 97 of the converter 80 and into the corresponding hole 37 of the ferrule 16. In some embodiments, the adhesive 65 may be applied before, during, or after the optical fiber 67 is inserted into the ferrule assembly 70 (as previously described with reference to FIG. Figures 7A-7C The connector 10 is formed by a process of forming the connector 10. The polishing of the connector 10 is then completed.

[0070] In an alternative embodiment, to assemble the connector 10, the optical fiber 67 is first inserted through the lead-in section 97 of the converter 80 and through the opening 87 of the converter 80. Then, the adhesive 65 is applied to the hole 37 of the ferrule 16 so that the inserted optical fiber 67 is secured to the connector 10 using the adhesive described above. Figures 7A-7C The optical fiber 67 is bonded to the hole 37 of the ferrule 16 by any of the methods discussed. After the optical fiber 67 is secured within the hole 37, the converter 80 is moved onto the ferrule 16 so that the converter 80 and the ferrule 16 snap-engage with each other as discussed above. In this embodiment, the polishing of the end face 30 of the ferrule 16 can be completed before or after the snap-fit ​​assembly of the ferrule assembly 70.

[0071] Reference now Figure 14-16 , an alternative embodiment of a ferrule assembly 70 is shown. In the description of the alternative embodiment of the ferrule assembly 70, similar components of the ferrule assembly 70 between the embodiments will have the same numbering except as noted herein. In this embodiment, the ferrule assembly 70 includes the ferrule 16 and the converter 80A as described above.

[0072] The converter 80A includes a front end 81, a rear end 83, and a converter body 85 extending from the front end 81 to the rear end 83. The converter body 85 includes an opening 87 extending between the front end 81 and the rear end 83, and the opening is defined by the shape of the converter body 85. The opening 87 is configured to receive the ferrule 16 between the front end 81 and the rear end 83 within the converter body 85. The converter body 85 also includes a retaining wedge 89 and side surfaces 91, 92 extending from a top section 93 and a bottom section 95 of the converter body 85 and extending into the opening 87. The retaining wedge 89 and the side sections 91, 92 cooperate to retain the ferrule 16 within the converter 80.

[0073] The retaining wedge 89 is configured to engage with the crosspiece A and extend into the recessed portion 28 when the ferrule 16 is coupled to the converter 80. Specifically, the vertical surface 90 of the retaining wedge 89 engages with the crosspiece A to hold the ferrule 16 in place and restrict movement along the z-direction as defined in the Cartesian coordinate system of the accompanying drawings. In addition, as shown, the converter 80A also includes a second retaining wedge 98 that contacts the rear end 21 of the ferrule 16. Specifically, the second retaining wedge 98 includes a vertical surface 99 that contacts the rear end 21 of the ferrule 16. In this manner, the second retaining wedge 98 engages with the rear end 21 of the ferrule 16 to hold the ferrule 16 in place and restrict movement along the z-direction as defined in the Cartesian coordinate system of the accompanying drawings. Although the second retaining wedge 98 is Fig.15 and Fig.16 Not shown, but also within the scope of the present disclosure, in an alternative embodiment, the second retaining wedge 98 is omitted and a secondary structure of the overmolded converter 80A (e.g., added material surrounding the pin holes 93, 95) contacts the rear end 21 of the ferrule 16 to assist in holding the ferrule 16 in place within the converter 80A.

[0074] To further secure the ferrule within the converter 80A, the side portions 91, 92 extend from the front end 81 of the converter 80 toward the rear end 83 of the converter 80. The side portions 91, 92 each include a corresponding surface 91A, 92A that is configured to correspond to the beveled edges 71, 72 of the ferrule 16, as discussed below. In addition, the surfaces 91A, 92A are spaced apart from each other by a width that corresponds to the width of the ferrule 16. As shown, the surfaces 91A, 92A are angled relative to the longitudinal axis L, and the surfaces 91A, 92A are inclined relative to the longitudinal axis L such that the angle is the same as the angle of the beveled edges 71, 72. By having the same angle and being spaced apart by the width of the ferrule 16, the side portions 91, 92 can accommodate the ferrule 16 into the converter 80A, whereby the surfaces 91A, 92A contact the beveled edges 71, 72 of the ferrule 16 and exert a force on the inserted ferrule 16. In this manner, the side surfaces 91 , 92 exert forces along the xy plane that cooperate with the physical structure of the transducer 80A to restrict movement of the ferrule 16 along the xy plane as defined in the Cartesian coordinate system of the drawings.

[0075] Brief reference Fig.15, when the ferrule 16 is surrounded by the converter 80A, the end face 30 of the ferrule 16 can protrude outwardly from the front end 81 of the converter 80A. Advantageously, such an outward protrusion enables the inserted optical fiber 67 and the end face 30 to be polished without interfering with the converter 80A. The polished end face 30 can help achieve physical contact between the inserted optical fiber 67 of the mated connector 10 by changing the geometry of the end face 30 so that the angle between the end face 30 and the inserted optical fiber 67 is improved. It is also within the scope of the present disclosure that in alternative embodiments, the end face 30 of the ferrule 16 can be recessed within the converter 80A, or the end face 30 of the ferrule 16 can be flush with the front end 81 of the converter 80A.

[0076] The converter 80A also includes pin holes 93, 95, which correspond to the pin holes 31, 33 of the ferrule 16 when the ferrule 16 is inserted into the converter 80A. The pin holes 93, 95 are configured to align with the pin holes 31, 33 of the ferrule 16 and extend the length of the pin holes 31, 33 to the rear end 83 of the converter 80A. In this way, when the ferrule 16 is installed in the converter 80A and the connector 10, the pin holes 31, 33 can receive the guide pins.

[0077] Brief reference Fig.16 , a rear view of the ferrule assembly 70 is shown. As shown, the converter 80A also includes a lead-in portion 97 extending from the rear end 83 of the converter 80A into the opening 87 of the converter 80A. The lead-in portion 97 is configured to provide access to the rear end 21 of the ferrule 16 and the corresponding lead-in section 35 when the optical fiber 67 is inserted into the ferrule assembly 70.

[0078] To apply the converter 80A to the ferrule 16, the converter 80A is overmolded onto the ferrule 16. In some embodiments, the converter 80A is molded directly onto the ferrule 16 in a secondary molding operation. Advantageously, by molding the converter 80A onto the ferrule 16, the features of the ferrule 16 create a bonded geometry / configuration that enables the ferrule 16 and the converter 80A to remain coupled to each other during their respective lifetimes. For example, the position of the crosspiece A and the recessed portion 28 of the ferrule 16 create a geometry of the converter 80A that enables the converter 80A to be coupled to the ferrule 16.

[0079] Since these and other variations, modifications, combinations and sub-combinations of the disclosed embodiments may occur to those skilled in the art, the invention should be construed as including all within the scope of the appended claims and their equivalents.

Claims

1. A ferrule for an optical connector, configured to receive a plurality of optical fibers, the ferrule comprising: a body having a front end and a rear end, the body extending in a longitudinal direction between the front end and the rear end; a plurality of holes extending into the body from the front end toward the rear end, wherein each hole is configured to receive one of the plurality of optical fibers; A plurality of tapered dividers, wherein each tapered divider has: a first end adjacent to a corresponding hole of the plurality of holes and a second end proximate to a rear end of the ferrule; a cross-sectional shape at the first end that separates each of the plurality of holes from one another across the perimeter of the respective holes; and A tapered surface from the second end to the first end.

2. The ferrule according to claim 1, wherein: The rear end of the ferrule includes a marking, whereby the marking provides a visual indicator of horizontal alignment of the plurality of optical fibers within the plurality of holes of the ferrule.

3. The ferrule according to claim 2, wherein: The marking extends from the rear end of the ferrule to the second end of the tapered partition.

4. The ferrule according to any one of claims 1 to 3, wherein: The tapered partition has a height H1 at a first end and a height H2 at a second end, wherein a height ratio H2:H1 ranges between 1.2:1 and 3:

1.

5. The ferrule according to any one of claims 1 to 4, wherein: The tapered divider has a width W1 at a first end and a width W2 at a second end, wherein the width ratio W2:W1 ranges between 1.2:1 and 3:

1.

6. The ferrule according to any one of claims 1 to 5, wherein: The tapered divider has a circular cross-section at a first end and a square cross-section at a second end.

7. The ferrule according to any one of claims 1 to 6, wherein: The tapered surface of the tapered divider has an angle relative to a longitudinal axis of one of the holes ranging between 15° and 45°.

8. The ferrule according to any one of claims 1 to 7, wherein: Adjacent tapered dividers have corresponding adjacent tapered surfaces that form an edge, wherein the edge is configured to prevent an optical fiber from being inserted into a non-corresponding hole.

9. The ferrule according to any one of claims 1 to 8, wherein: The second end of the tapered partition is flush with the rear end of the ferrule.

10. The ferrule according to any one of claims 1 to 9, wherein: The plurality of holes includes a first row of holes and a second row of holes spaced apart from the first row of holes, wherein the first row of holes are coplanar with each other and the second row of holes are coplanar with each other.

11. The ferrule according to claim 10, wherein: The first row of holes and the second row of holes are separated by a spacer, the spacer is flush with the rear end of the ferrule, and wherein the spacer is formed integrally with the ferrule.

12. The ferrule according to any one of claims 1 to 11, wherein: The ferrule further includes a window formed on a top surface or a bottom surface of the ferrule, wherein the window extends into a lead-in section of the ferrule adjacent to the tapered partition.

13. An optical connector, comprising: The ferrule according to any one of claims 1 to 12; and A plurality of optical fibers are secured to the ferrule, wherein each optical fiber extends from the rear end of the body and into one of the microholes.

14. The optical connector according to claim 13, wherein: The plurality of holes includes a first row of holes and a second row of holes spaced apart from the first row of holes; The first row of holes are coplanar with each other, and the second row of holes are coplanar with each other; The plurality of optical fibers includes a first ribbon of optical fibers and a second ribbon of optical fibers; said first ribbon of optical fibers and said second ribbon of optical fibers being coplanar with each other; said first ribbon of optical fibers and said second ribbon of optical fibers are separated by a fiber spacer; and The first ribbon of optical fibers, the second ribbon of optical fibers, and the fiber spacer are inserted into the rear end of the ferrule such that the first ribbon of optical fibers is inserted into the first row of holes and the second ribbon of optical fibers is inserted into the second row of holes.

15. The optical connector according to claim 14, wherein: The first row of holes and the second row of holes are separated by a spacer, the spacer is flush with the rear end of the ferrule, and wherein the spacer is formed integrally with the ferrule.

16. The optical connector according to claim 15, wherein: The plurality of optical fibers includes a first ribbon of optical fibers and a second ribbon of optical fibers, wherein the first ribbon of optical fibers and the second ribbon of optical fibers are coplanar with each other; and The first ribbon of optical fibers and the second ribbon of optical fibers are inserted into the rear end of the ferrule so that the first ribbon of optical fibers is inserted into the first row of holes and the second ribbon of optical fibers is inserted into the second row of holes.

17. A method for terminating a plurality of optical fibers with a ferrule as claimed in any one of claims 1 to 16, comprising: Align the optical fiber with the hole of the ferrule; as well as Optical fibers are extended through the rear end of the ferrule and into the bores, wherein the tapered partitions provide for extending one optical fiber through each of the bores.

18. The method according to claim 17, wherein: The alignment step comprises: aligning a first ribbon of optical fibers with the first row of holes; and Align the second ribbon of optical fibers with the second row of holes.

19. The method according to claim 18, wherein: Aligning the first ribbon of optical fibers comprises aligning the optical fibers of the first ribbon with markings on the rear end of the ferrule; and Wherein, aligning the second ribbon of optical fibers comprises aligning the optical fibers of the second ribbon with a mark on the rear end of the ferrule.

20. The method according to claim 18 or 19, wherein: The first ribbon of optical fibers and the second ribbon of optical fibers are separated by a fiber spacer, and the fiber spacer is inserted into the ferrule together with the first ribbon of optical fibers and the second ribbon of optical fibers.

21. The method according to any one of claims 17 to 20, further comprising: Adhesive is supplied into the tapered partition.

22. The method according to claim 21, wherein: The adhesive is supplied to the aperture through a window formed in the top surface of the ferrule and extending into a lead-in section of the ferrule adjacent the tapered partition.

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