The invention relates to an optical plug connector device according to Claim 1.
From US 2012/0093462 A1 there is known a multi-fiber plug, which comprises a ferrule and a lens array fashioned as a single piece with the ferrule. Conical channels are devised in the ferrule, which are designed to receive an optical fiber each and to orient the optical fibers relative to the lens array.
Moreover, MPO and MTP ferrules are known in the prior art, in which an orienting of optical fibers is done by means of precision recesses. The making of the precision recesses is done with large manufacturing expense, resulting in high component costs. A play between the precision recesses and optical fibers arranged in the precision recesses cannot be avoided. Moreover, many optical fibers need to be inserted in the individual precision recesses during a manufacturing process, and this insertion process cannot be done by automation. A further drawback of the known MPO and MTP ferrules is the need for high pressing forces, which increase with the number of optical fibers.
The problem which the invention proposes to solve is in particular to provide an optical plug connector device of this kind with advantageous properties in regard to a manufacturing and/or in regard to manufacturing costs. The problem is solved according to the invention by the features of Claim 1, while advantageous embodiments and modifications of the invention will be found in the dependent claims.
The invention starts from an optical plug connector device with at least one lens array and with at least one fiber holder, which is designed to position end regions of a plurality of optical fibers relative to the lens array, and which has at least one first fiber holding element.
It is proposed that the fiber holder comprises at least one second fiber holding element, having a higher manufacturing precision than the first fiber holding element.
By an “optical plug connector device” is meant here and in the following in particular a part, in particular a subassembly, of an optical plug connector, in particular an optical plug, and/or an optical cable, in particular a prefabricated optical cable. By a “lens array” is meant in this context a unit comprising a plurality of mechanically interconnected optical lens elements. In particular, the lens elements of the lens array are arranged such that the optical axes of the lens elements run at least substantially parallel to one another. The lens elements may in particular be arranged in a common plane or in several planes which run in particular at least substantially parallel to one another. By “at least substantially parallel” is meant in particular an orientation of a direction relative to a reference direction, in particular in a plane, wherein the direction has a deviation in particular less than 1°, advantageously less than 0.5° and especially advantageously less than 0.3° from the reference direction. By a “lens element” is meant in this context in particular an element which is designed to focus light rays running at least substantially in parallel at a focal point and/or to parallelize and/or focus light rays emanating from a focal point. The lens elements are made in particular of glass, plastic, or another transparent material, having in particular a higher refractive index than air. In particular, the lens elements may be designed as a GRIN lens or a convex lens, in particular a biconvex and/or planoconvex lens. However, other lens types and/or shapes are also conceivable, such as in particular Fresnel lenses and/or liquid lenses and/or liquid crystal lenses. Preferably, all lens elements of the lens array have the same configuration. However, combinations of different lens types and/or shapes within the lens array are also conceivable. By “designed” is meant in particular specially programmed, configured, and/or outfitted. In particular, it shall be meant by an object being designed for a particular function that the object fulfills and/or executes this particular function in at least one application and/or operating state.
By a “fiber holder” shall be meant in this context in particular a unit comprising at least two fiber holding elements, which is designed to receive and/or mechanically secure and/or orient at least substantially parallel to one another a plurality of optical fibers in at least one plane. In particular, the fiber holder is designed to create a defined horizontal spacing between every two immediately adjacent optical fibers and/or a defined vertical spacing between every two immediately adjacent fiber planes. A deviation from a horizontal and/or vertical nominal spacing is in particular less than 5 μm, advantageously less than 3 μm and especially advantageously less than 1 μm. By a “plurality of optical fibers” shall be meant in this context in particular a number of at least eight optical fibers, advantageously at least twelve optical fibers, preferably at least 16 optical fibers and especially preferably at least 32 optical fibers. The fiber holder being designed “to position relatively” the optical fibers to the lens array shall mean in particular that the fiber holder is designed to arrange and/or orient the optical fibers in particular in a mounted state such that a spacing between the optical axes of the optical fibers and a direction of extension of the optical axes of the optical fibers corresponds at least substantially to a spacing and a direction of extension of the optical axes of the lens elements of the lens array. Preferably, the fiber holder is designed to arrange and/or orient the optical fibers such that each time an optical axis of one of the optical fibers is at least substantially congruent with an optical axis of a lens element of the lens array. By “at least substantially congruent” shall be meant in this context in particular that a deviation of an optical axis of one of the optical fibers from an optical axis of a lens element is each time in particular less than 5μm, preferably less than 3 μm and especially preferably less than 1 μm.
By “manufacturing precision” is meant in this context in particular a precision of a manufactured workpiece influenced by machine, process, tool, workpiece and/or environment related factors. Machine-related and/or process-related factors may be in particular different function tolerances of machine elements, inaccuracies of positioning and/or control systems and/or vibrations of a machine system. Tool-related factors may be, for example, tool geometry, tool positioning and/or arrangement, and/or tool wear. Workpiece-related factors may be for example the geometry of a workpiece and/or an intermediate product and/or a microstructure and/or material properties. Environment-related factors may be for example a temperature and/or a humidity. In particular, the manufacturing precision influences directly and/or indirectly a workpiece quality, in particular in regard to at least one dimensional deviation, shape deviation, position deviation and/or roughness deviation. By a second fiber holding element having a “higher manufacturing precision” than a first fiber holding element shall be meant in particular that the second fiber holding element has fewer deviations of at least one nominal value, in particular dimensional deviations, shape deviations, position deviations and/or roughness deviations, than the first fiber holding element in particular by a factor of 10, advantageously by a factor of 50, preferably by a factor of 100 and especially preferably by a factor of 200. In particular, the first fiber holding element and the second fiber holding element are manufactured separately from each other by means of different manufacturing processes and/or they are made from different materials.
Thanks to such a configuration, it is possible to provide an optical plug connector device having advantageous properties with regard to a manufacturing, in particular an automated manufacturing, and/or with regard to manufacturing costs. In particular, the first fiber holding element may be manufactured in greater numbers by means of an advantageously economical and/or simple mass production process, for example by means of an injection molding process, and/or be made from an economical material. The second fiber holding element, having a higher manufacturing precision than the first fiber holding element, can be manufactured in particular in numbers advantageously adapted to needs and in a different manufacturing process. Moreover, an advantageously simple and in particular automated inserting of optical fibers into fiber holding elements can be made possible with high manufacturing quality.
Moreover, it is proposed that the first fiber holding element is designed for a prepositioning and the second fiber holding element for a fine positioning of the optical fibers. By a “prepositioning” is meant in particular an arranging, orienting and/or separating of the optical fibers occurring during a manufacturing process prior to a fine positioning and/or one which occurs spatially in advance of a fine positioning in a finished product, in particular a rough process thereof. By a “fine positioning” is meant in particular an exact orienting of optical axes of the optical fibers to optical axes of lens elements of the lens array. By a “separating” is meant in particular the introducing of a defined spatial distance between the optical fibers. The optical fibers are at first prepositioned by means of the first fiber holding element and then fine positioned by means of the second fiber holding element. Thanks to the prepositioning of the optical fibers, an advantageously simple and/or exact fine positioning of the optical fibers can be done. In particular, a manufacturing process can have an advantageously simple layout in this way and in particular it can be automated.
Furthermore, it is proposed that the second fiber holding element is designed to orient the end regions of the optical fibers relative to the lens array. In particular, the second fiber holding element is designed to orient each time an end region of an optical fiber relative to a corresponding lens element of the lens array. The second fiber holding element has in particular a plurality of recesses which are designed to each accommodate at least one end region of one of the optical fibers. In particular, the second fiber holding element is designed to enclose the end regions of the optical fibers at least partly and preferably entirely in the circumferential direction. This makes possible an advantageously exact orienting of the optical axes of the optical fibers and/or an advantageously secure guidance of the optical fibers in particular in an end region.
In one embodiment of the invention, it is proposed that the first fiber holding element is embodied at least in a two-part implementation. The first fiber holding element comprises in particular at least one base element and at least one cover element. In particular, the base element comprises at least one recess configured to correspond to the cover element, which is designed to accommodate the cover element at least partly and preferably entirely. In particular, the base element and the cover element are joined together in a mounted condition by force locking, form fitting, and/or as a single piece. By “joined as a single piece” is meant in particular an integral bonding, such as one produced by a welding process and/or a gluing process, etc. The base element and the cover element in a mounted condition are intended in particular for a prepositioning and/or separating of the optical fibers and/or in particular for a mechanical fixation of the optical fibers. The optical fibers are inserted into the recess of the base element. The cover element is inserted into the corresponding recess of the base element. The optical fibers are secured in particular by a clamping force between the base element and the cover element. This makes possible an advantageous prepositioning, a separating and/or in particular a mechanical fixation of the optical fibers.
It is furthermore proposed that the fiber holder and the lens array are fabricated as separate components. The fiber holder and the lens array are joined together as a single piece in particular. In particular, the lens array is joined as a single piece to the first fiber holding element and/or to the second fiber holding element. The lens array is oriented in particular mechanically and/or optically relative to the fiber holder. In particular, the lens array is oriented mechanically and/or optically relative to the second fiber holding element. Thanks to the manufacturing of the fiber holder and the lens array as separate components, low manufacturing costs can advantageously be achieved and the components can be produced each time with the requisite precision and/or from a suitable material each time.
Preferably, an index adjustment material is arranged between the lens array and the fiber holder, in particular an index-matching gel and/or an index-matching adhesive. The index adjustment material is designed in particular to reduce optical losses. In particular, the index adjustment material is arranged between the lens array and the second fiber holding element. The lens array is secured in particular by means of the index adjustment material to the fiber holder. In particular, the lens array is secured by means of the index adjustment material to the second fiber holding element. In this way, optical losses can be advantageously reduced, in particular in regard to an insertion attenuation, in particular by reduction of Fresnel reflections. Furthermore, the lower reflection losses contribute to less light being reflected back in a transmission pathway, which advantageously improves a return loss of an optical junction.
Furthermore, it is proposed that the lens array has one-sidedly arranged recesses, which are designed to receive the end regions of the optical fibers. The recesses in particular are arranged on a side of the lens array which is situated opposite the lens elements. In particular, the recesses are fashioned as blind recesses. In particular, the recesses are oriented aligned with the optical axes of the lens elements of the lens array. In particular, the recesses are designed to orient the optical fibers to the lens elements. This makes possible an advantageously precise orienting of the fibers to the lens element of the lens array. Moreover, the number of components and the addition of tolerances can be advantageously reduced.
Furthermore, it is proposed that the first fiber holding element and/or the second fiber holding element is at least substantially plate-shaped. By a “substantially plate-shaped element” is meant in particular a three-dimensional element having, in a developed view in a plane, a nonround cross sectional surface in a cross section perpendicular to the plane and a material thickness, in particular an at least substantially constant material thickness perpendicular to the plane, which is less than 50%, preferably less than 25% and especially preferably less than 10% of a surface extension of the three-dimensional element parallel to the plane, in particular a smallest surface extension of the element parallel to the plane. In particular, at least the second fiber holding element is at least substantially plate-shaped. Thanks to the plate shape, the material needed to manufacture the fiber holding elements can be advantageously reduced to a minimum, so that material costs can be advantageously reduced. Moreover, the plate-shaped configuration allows a making of recesses by means of advantageously simple and/or economical machining methods, in particular on account of the favorable ratio between the diameter and the depth of the recesses being produced.
Furthermore, it is proposed that the fiber holder, in particular the first fiber holding element and/or the second fiber holding element, has at least partially conical recesses, which are designed to at least partially receive the optical fibers. In particular, the recesses are fashioned as through recesses. In particular, the second fiber holding element has at least partially conical recesses, which are designed to receive the end regions of the optical fibers. The optical fibers in particular are led entirely through the recesses. Preferably, the optical fibers are at first led through recesses of the first fiber holding element and then through recesses of the second fiber holding element. In particular, the recesses of the second fiber holding element have a smaller diameter than the recesses of the first fiber holding element. In particular, the optical fibers are led entirely through recesses of the second fiber holding element and cut to length at an exit side, in particular by means of laser cleaving. Thanks to the conical configuration of the recesses and/or the diminishing diameter of the recesses, an advantageously simple, in particular an automated inserting of the optical fibers into the recesses can be accomplished.
In another embodiment of the invention it is proposed that the fiber holder comprises at least one third fiber holding element having a higher manufacturing precision than the first fiber holding element and a lower manufacturing precision than the second fiber holding element. In particular, the third fiber holding element is plate-shaped. Preferably the third fiber holding element has at least partially conical recesses, which are designed to at least partially receive the optical fibers. In particular, the recesses of the third fiber holding element have a smaller diameter than the recesses of the first fiber holding element. The recesses of the second fiber holding element have in particular a smaller diameter than the recesses of the third fiber holding element. In this way, the orienting of the optical fibers can be further simplified. Thanks to the diminishing diameter of the recesses from one fiber holding element to the next fiber holding element, the inserting of the optical fibers can be advantageously simplified and/or advantageously automated, in particular along the optical axis.
Furthermore, it is proposed that the fiber holding elements are arranged, with increasing manufacturing precision, along a direction of longitudinal extension of the optical fibers toward the end regions of the optical fibers. The optical fibers are in particular led at first through recesses of the first fiber holding element, then through recesses of the third fiber holding element and finally through recesses of the second fiber holding element. In particular, the recesses of the third fiber holding element have a smaller diameter than the recesses of the first fiber holding element. The recesses of the second fiber holding element in particular have a smaller diameter than the recesses of the third fiber holding element. By arranging the fiber holding elements with increasing manufacturing precision and decreasing diameter of the recesses, an inserting of the optical fibers can advantageously be easily automated.
Furthermore, it is proposed that the first fiber holding element has at least one separating means, in particular a toothing, which is designed to separate the optical fibers. By the separating means being designed to “separate” the optical fibers is meant in particular that the separating means is designed to introduce a defined spatial distance between the optical fibers. In particular, the separating means is designed to arrange the optical fibers at a distance from each other and at least substantially in parallel with each other. In this way, an advantageous rough first arrangement, in particular a rough prepositioning, of the optical fibers can be achieved. Moreover, it can be advantageously achieved that the corresponding recesses of the next fiber holding element in the optical direction are located with sufficient accuracy, in particular when inserting the optical fibers.
Furthermore, it is proposed that the second fiber holding element is implemented at least substantially from a ceramic material, from a glass, from silicon, a metal and/or a plastic. Preferably, the second fiber holding element is embodied at least substantially of glass and/or silicon. Material combinations should be chosen in particular such that different coefficients of thermal expansion worsen the orienting of optical fibers to corresponding lens elements, in particular in a temperature range of −20° C. to 80° C., by not more than 5 μm, preferably by not more than 3 μm and especially preferably by not more than 1 μm. In this way, an advantageously high manufacturing quality of the second fiber holding element and thus an advantageously exact orienting of the optical fibers can be achieved.
In another embodiment of the invention it is proposed that the first fiber holding element has an accommodation for the second fiber holding element. In this way, an advantageous orienting of the first fiber holding element to the second fiber holding element can be achieved. Preferably, the second fiber holding element is made from a casting compound. By a “casting compound” is meant in this context a compound which is to be worked in a liquid state, being designed to be cured and/or to cure spontaneously after being worked. In particular, the casting compound can be implemented from a casting resin, an adhesive, in particular a binary adhesive, and/or a solder, such as a brazing solder or a soft solder. The optical fibers are arranged in the recess of the first fiber holding element. In particular, the optical fibers are arranged in the recess of the first fiber holding element such that no direct contact exists between the optical fiber holders and the first fiber holding element. The fibers are oriented inside the first fiber holding element by means of orienting units situated outside the first fiber holding element. In one embodiment of the process, the optical fibers are subjected by the orienting unit to a traction force acting along a direction of longitudinal extension of the optical fibers. The casting compound is poured into the recess of the first fiber holding element. After the curing, the casting compound forms the second fiber holding element. In this way, an advantageously economical configuring of the first and the second fiber holding element can be achieved. Moreover, an advantageously long-lasting fixation and orientation of the optical fibers can be achieved.
Furthermore, a prefabricated optical cable is proposed, in particular a patch cable, with at least one optical plug connector device according to the invention.
Preferably, in combination with at least one feature described above or also in particular independently of previously described features, it is proposed that the optical fibers have at least substantially mushroom-shaped thickened end sections, in particular on account of being truncated by means of laser cleaving, which are designed to center end regions of the optical fibers each in at least one recess. In particular, the at least substantially mushroom-shaped thickened end sections are designed to center the end regions of the optical fibers in at least one recess of the second fiber holding element and/or to receive them therein free of play. The at least one recess has in particular an at least substantially circular exit opening. The optical fibers are led in particular entirely through a recess. At an exit side, the optical fibers are cut to length, in particular by means of laser cleaving. The optical fibers are pushed back or pulled contrary to the lead-through direction in exit openings of the recesses. The end regions of the optical fibers are centered by the mushroom-shaped thickened end sections in the recesses. Thanks to the centering of the end regions of the optical fibers in the recesses, an advantageously precise and play-free orienting of the optical fibers can be accomplished.
Furthermore, a method for manufacturing an optical plug connector device with at least one lens array and with at least one fiber holder is proposed, which has at least one first fiber holding element and at least one second fiber holding element having a higher manufacturing precision than the first fiber holding element, wherein end regions of a plurality of optical fibers are positioned relative to the lens array by means of the fiber holder. In this way, an advantageously simple and/or economical manufacturing can be accomplished, which can be advantageously easily automated or at least partly automated.
Further benefits will emerge from the following description of drawings. The drawings represent three sample embodiments of the invention. The description and the claims contain many features in combination. The skilled person will also advisedly consider the features individually and put them together in further meaningful combinations.
There are shown:
The second fiber holding element 22a is shoved onto the end regions 16a of the prepositioned optical fibers 18a (cf.
As is represented in
The accommodation 32b in a further step of the method is filled with a casting compound, such as a UV-curing adhesive, and the casting compound is cured. After the curing, the casting compound forms the second fiber holding element 22b. After the curing of the casting compound, the orienting unit 54b arranged at a side of the fiber holder 14b facing away from a cable 60b is removed and the optical fibers 18b are cut to length flush with the fiber holder 14b, for example by means of laser cleaving. Alternatively, a piece of the fiber holder 14b may additionally be removed. As shown in
Moreover, the optical plug connector device 10c has a fiber holder 14c. The fiber holder 14c is designed to position the end regions 16c of the optical fibers 18c relative to the lens array 12c. The fiber holder 14c and the lens array 12c are produced as separate components. The fiber holder 14c comprises a first fiber holding element 20c and a second fiber holding element 22c. The second fiber holding element 22c has a higher manufacturing precision than the first fiber holding element 20c. The first fiber holding element 20c is designed for a prepositioning and the second fiber holding element 22c for a fine positioning of the optical fibers 18c. Moreover, the fiber holder 14c has a third fiber holding element 28c having a higher manufacturing precision than the first fiber holding element 20c and a lower manufacturing precision than the second fiber holding element 22c. Alternatively, a fiber holder may also have more or fewer fiber holding elements. The fiber holding elements 20c, 22c, 28c are arranged with increasing manufacturing precision along a direction of longitudinal extension 30c of the optical fibers 18c toward the end regions 16c of the optical fibers 18c. The fiber holding elements 20c, 22c, 28c are plate-shaped. The fiber holding elements 20c, 22c, 28c each have conical recesses 26c, which are designed to at least partially receive the optical fibers 18c. A mechanical orienting of the fiber holding elements 20c, 22c, 28c and the lens array 12c is done by guide elements 50c. The diameters of the recesses 26c diminish in the direction from the first fiber holding element 20c to the third fiber holding element 28c to the second fiber holding element 22c.
The configured optical cable 34c moreover comprises a housing 62c, having a housing upper shell 64c and a housing lower shell 66c. The housing 62c has accommodations 68c which are designed to hold the lens array 12c, the fiber holding elements 20c, 22c, 28c and the guide elements 50c. Intermediate spaces between the fiber holding elements 20c, 22c, 28c are filled with an adhesive, so that a compound unit is realized. Optionally, an index-matching gel or index-matching adhesive can be placed between the end regions 16c of the optical fibers 18c and the lens array 12c.
Filing Document | Filing Date | Country | Kind |
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PCT/EP2015/074291 | 10/21/2015 | WO | 00 |