Shroud for use with optical fiber array in attachment to an associated waveguide array

Abstract

An optical interconnection assembly is proposed that includes a shroud that is positioned over a waveguide array component and configured to drive an initial, coarse passive optical alignment between a waveguide array and a fiber array. The assembly further includes releasable clamping mechanism that is positioned over the shroud and used to hold the fiber array in its final, precise aligned position as created by the use of mating alignment features. The use of a releasable force allows for the fiber array to be removed and replaced, as necessary.

Description

[0001] SHROUD FOR USE WITH OPTICAL FIBER ARRAY IN ATTACHMENT TO AN ASSOCIATED WAVEGUIDE ARRAY

[0002] Cross-Reference to Related Applications

[0003] This application claims priority from U.S. Provisional Application No. 63 / 661,765, filed June 19, 2024; U.S. Provisional Application No. 63 / 690,433, filed September 4, 2024; and U.S. Provisional Application No. 63 / 748,526, filed January 23, 2025, all referenced provisional applications incorporated herein by reference.

[0004] Technical Field

[0005] Disclosed herein is an arrangement for facilitating passive optical alignment between a fiber array component and an array of optical waveguides. A housing assembly (referred to hereafter as a "shroud") is included as part of the arrangement and is configured to facilitate passive optical alignment between the fiber and waveguide arrays. In some embodiments, the shroud may be used in combination with a clamping element to permit the fiber array component to be removed and replaced.

[0006] Background of the Invention

[0007] The current state of the art is replete with configurations to provide aligned coupling between an array of optical fibers disposed on a first component and an array of optical waveguides fabricated within a second component. Various arrangements may employ mating alignment features formed on the two components to assist in ensuring optimum coupling of optical signals between the two arrays (i.e., "passive alignment"). Active alignment performed by moving one array with respect to the other while measuring coupled optical signal power (or any other metric) is often used as well. In most cases, once alignment is achieved, some type of epoxy or other bonding material is used to create a permanent alignment between the two arrays.

[0008] It is contemplated that some applications may benefit from eliminating the need for bonding material to be introduced into the aligned system. Additionally, it may be advantageous to provide a configuration where a fiber array may be removed and replaced when one or more fibers in the array are damaged or otherwise not functioning properly.

[0009] Summary of the Invention

[0010] The needs remaining in the art are addressed by the present invention, which is directed to the use of an optical interconnection assembly that is configured to guide a fiber array component into an optically aligned position with respect to an associated array of optical waveguides as formed within a photonic integrated circuit (PIC) component. The optical interconnection assembly includes a shroud that is particularly configured to drive an initial, coarse optical alignment between a waveguide array and a fiber array, as well as a releasable clamping mechanism (referred to at times hereafter as a "releasable clamping member") that is positioned over the shroud and used to hold the fiber array in its aligned position. The use of a releasable force allows for the fiber array to be removed and replaced, as necessary. For the purposes of the present invention "coarse alignment" may be defined as properly positioning the fiber array with respect to the waveguide array such that the respective alignment features are in proximity to one another. A "precise" alignment then follows where the alignment features mate in a manner that achieves a passive optical alignment with a sub-micron level of accuracy in the x and y directions across the endfaces of the arrays.

[0011] As will be described in detail below, an example shroud may be designed to include tapered interior walls (side and / or top) that contact the surfaces of a fiber array component and guide it into coarse alignment with the waveguide array component. The shroud may be formed to include an aperture through its top surface, where an external force from the releasable clamping member may be applied through the aperture to hold the fiber array component in its aligned position without requiring the use of any other bonding material. Advantageously, the use of a releasable force allows for the fiber array component to be removed and replaced when necessary and again achieve precise passive alignment with a newly -positioned fiber array. In accordance with the principles of the present invention, an example shroud may be formed to exhibit inwardly tapering sidewalls and a downwardly tapering ceiling so as to guide a fiber array component downward and inward toward the edge of the waveguide array component along which the companion waveguide array is exposed.

[0012] Further in accordance with the present invention, the releasable clamping member ensures that passive alignment between the fiber array component and the waveguide array component is maintained. While alignment features as known in the art may be used to initially attain a precise alignment between the arrays, the application of the downward force from the releasable clamping member maintains that achieved level of alignment. Inasmuch as the clamping member is particularly configured to also release the applied force, this arrangement of the present invention allows for an initially -positioned fiber array to be removed and replaced, as necessary.

[0013] In one example embodiment, the shroud may comprise a magnetic component formed to include an aperture through its top surface, with the clamping mechanism comprising a magnetic element that will be attracted to, and thus can be releasably attached to, the shroud. The magnetic embodiment of the releasable clamping member itself may include a pin positioned to extend downward (vertically, y-direction) below the magnetic element and pass through the shroud's aperture, thus applying the downward releasable force against the aligned arrangement of the waveguide array component and fiber array component. The applied downward force is used to achieve and maintain a sub-micron level of accuracy in the x and y alignment directions between the waveguide array and the fiber array, as well as maintain a controlled z- direction (optical axis) gap spacing between endface of the fiber array and the endface of the waveguide array.

[0014] In some embodiments, the shroud is sized to be large enough to extend beyond the width of the waveguide array component. Alternatively, the shroud may be sized to instead be disposed directly on the waveguide array component itself. In the latter case, the shroud is positioned at a pre-defined location on the surface of the waveguide array component that enables passive alignment between an inserted fiber array and the waveguide array formed on the waveguide array component.

[0015] Other embodiments of the present invention may take the form of a multicomponent shroud that includes a first (interior) shroud member that is disposed over and attached to the fiber array component and a second (exterior) shroud member similar in form and function to the embodiments described above. Here, the interior shroud member functions as a protective covering for the fiber array component itself and eliminates the need for direct physical contact between the fiber array component and exterior shroud during alignment with and attachment to the waveguide array component.

[0016] An exemplary embodiment of the present invention may take the form of an optical interconnection assembly for facilitating releasable passive alignment between an array of optical waveguides formed within a waveguide array component and an array of optical fibers positioned on a fiber array component. The optical interconnection assembly comprises a shroud that is used in combination with a releasable clamping member to maintain a passively aligned mating of the two components. The shroud is configured to be disposed over the fiber array component and includes a front opening sized to accommodate an insertion of the fiber array component and an aperture through a top surface thereof. The shape of the shroud is configured to facilitate passive alignment positioning of the fiber array component with respect to the waveguide array component. The releasable clamping member is disposed over and releasably attached to the shroud. The releasable clamping member is configured to impart a downward force on the fiber array component sufficient to hold it in a passively aligned position with respect to the waveguide array component as long as the releasable clamping member maintains attachment to the shroud. Otherwise, the removal of the releasable clamping member results in eliminating the downward force and enables the fiber array component to be retracted from its passively aligned position. Other and further aspects and features of the present invention will become apparent during the course of the following discussion and by reference to the accompanying drawings.

[0017] Brief Description of the Drawings

[0018] Referring now to the drawings, where like numerals reference like parts in several views:

[0019] FIG. 1 is an isometric view of an optical interconnection assembly including a shroud and releasable clamping member formed in accordance with the present invention;

[0020] FIG. 2 is an exploded view of the arrangement of FIG. 1;

[0021] FIG. 3 is an enlarged isometric view of an exemplary shroud portion of the inventive optical interconnection assembly;

[0022] FIG. 4 is a view from the underside of the shroud of FIG. 3;

[0023] FIG. 5 is a top view of an example of a waveguide array component and a fiber array component, illustrating alignment features that may be used to provide passive alignment upon placement of the fiber array component over the shroud-covered waveguide array component;

[0024] FIG. 6 is a top view of the combination of FIG. 5, in this case where the fiber array component is positioned in passive optical alignment with the waveguide array component;

[0025] FIG. 7 is a cut-away side view of the combination of FIG. 6, particularly illustrating a controlled z-direction gap spacing between the waveguide array formed in the waveguide array component and the fiber array supported on the fiber array component;

[0026] FIG. 8 is an isometric view of another configuration of a fiber array component, in this case including only a pair of extra-array alignment features;

[0027] FIG. 9 is a top view of the configuration of FIG. 8 as engaged and passively aligned with a waveguide array component; FIG. 10 is a cut-away side view of the arrangement of FIG. 9;

[0028] FIG. 11 is a rear isometric view of the arrangement of FIG. 6, in combination with a shroud element formed in accordance with the principles of the present invention;

[0029] FIG. 12 is a top isometric view of the same arrangement as shown in FIG. 11;

[0030] FIG. 13 is an isometric view of an exemplary optical interconnection assembly of the present invention, showing both the shroud and the releasable clamping member;

[0031] FIG. 14 is a view from the underside of one embodiment of the releasable clamping member of the present invention;

[0032] FIG. 15 is a cut-away side view of the optical interconnection assembly of FIG. 13, illustrating the y-axis and z-axis controls on the passive alignment between the waveguide array component and the fiber array component;

[0033] FIG. 16 is a cut-away end view of the arrangement of FIG. 13, in this orientation illustrating the x-axis and y-axis controls on the passive alignment;

[0034] FIG. 17 is an isometric view of an alternative embodiment of a releasable clamping member formed in accordance with the teachings of the present invention

[0035] FIG. 18 is a cut-away side view of the alternative embodiment of FIG. 17;

[0036] FIG. 19 is an isometric view of an alternative embodiment of an optical interconnection assembly formed in accordance with the principles of the present invention, where in this embodiment the shroud is disposed directly on the waveguide array component;

[0037] FIG. 20 is a view of the embodiment of FIG. 19 with the shroud removed for illustrative purposes;

[0038] FIG. 21 is an enlarged view of the waveguide array portion of the alternative embodiment of FIG. 19;

[0039] FIG. 22 contains a cut-away side view of the alternative embodiment of FIG. 19;

[0040] FIG. 23 is a cut-away end view of the alternative embodiment of FIG. 19;

[0041] FIG. 24 is a side view similar to that of FIG. 22, in this case also illustrating the position of the inventive releasable clamping member; FIG. 25 is an isometric view of another configuration of the alternative embodiment of FIG. 19, in this case forming the shroud to include a protective cover that surrounds the side walls of the fiber array component;

[0042] FIG. 26 contains the same isometric view as shown in FIG. 25, in this case illustrating the protective cover as a transparent element;

[0043] FIG. 27 is a cut-away side view of the configuration of FIG. 25; and

[0044] FIG. 28 is an end view of the configuration of FIG. 25.

[0045] Detailed Description

[0046] FIG. 1 is an isometric view of an optical interconnection assembly 10 utilizing an exemplary shroud 12 and a releasable clamping member 20 formed in accordance with the principles of the present invention to facilitate passive optical alignment between a fiber array component 14 and a waveguide array component 16 (component 16 best seen in the view of FIG. 5, discussed below). FIG. 2 is an exploded version of the same isometric view as shown in FIG. 1, and better depicts the individual components of interconnection assembly 10, particularly waveguide array component 16. Referring to both FIGs. 1 and 2, waveguide array component 16 is positioned during assembly on a support member 18, and shroud 12 is disposed to surround the sides of waveguide array component 16. Support member 18 may take the form of an intermediate substrate / interposer component, or a printed circuit board assembly (PCBA) structure itself. As will be described in detail below, shroud 12 is fabricated to precisely mate with waveguide array component 16 and may be configured to include interior features useful for guiding fiber array component 14 into an initial, coarse level of passive optical alignment with waveguide array component 16.

[0047] Various known types of alignment features (e.g., mating V-grooves and ridges) formed on fiber array component 14 and waveguide array component 16 are then used to facilitate a more precise optical alignment between the fiber array and waveguide array once shroud 12 has properly positioned fiber array component 14. Once the alignment features are mated, releasable clamping member 20 is positioned over and attached to shroud 12. As will be discussed in detail below, releasable clamping member 20 provides a downward force through shroud 12 and onto fiber array component 14, securing the aligned positioning of fiber array component 14 with respect to waveguide array component 16.

[0048] An aspect of the inventive principles is directed to the ability to also detach (i.e., "release") fiber array component 14 from aligned engagement with waveguide array component 16. Releasable clamping member 20 is used for this purpose. In particular embodiments where a magnetic attraction is used as the releasable force, shroud 12 is formed of a magnetic composition (e.g., Kovar or other suitable material) and releasable clamping member 20 is formed to include a magnetic element that will naturally attach to the top surface of shroud 12. As will be further described below, releasable clamping member 20 may be formed to include a vertical pin extending below its bottom surface, where the pin passes through an aperture 22 (shown in FIG. 2) formed in shroud 12 and contacts fiber array component 14 in its aligned position over waveguide array component 16. It is the force applied by the pin (in this embodiment) that holds fiber array component 14 and waveguide array component 16 in alignment. Overcoming the attractive magnetic force allows for releasable clamping member 20 to be removed, releasing the downward force of the pin on fiber array component 14 and thereby permitting fiber array component 14 to be removed and replaced as needed. Advantageously, the use of shroud 12 and releasable clamping member 20 ensure that a precise passive alignment can be achieved with a replacement fiber array component.

[0049] The arrangement as shown in FIGs. 1 and 2 also illustrates components that may be considered optional, but are still useful in achieving the goal of passive alignment between a waveguide array and a releasable fiber array. In particular, a fiber array guiding element 13 and a fiber supporting clamp 15 are shown. Guiding element 13 may be useful during assembly to prevent the individual fibers forming the array from twisting or turning, for example. Supporting clamp 15 may function as a stress relief member, isolating the included fibers from any movements of the fiber ribbon to the right of supporting clamp 15.

[0050] FIG. 3 is an enlarged isometric view of an exemplary embodiment of shroud 12, with FIG. 4 showing a view from the underside of shroud 12. Shroud 12 is formed in this example to have a width W12 that extends beyond the width Wi6 of waveguide array component 16 (as denoted in FIG. 2). In order to assist in the guidance of fiber array component 14 into passive alignment with waveguide array component 16, shroud 12 is shown in FIGs. 3 and 4 as including inwardly tapering sidewalls 24.1 and 24.2. Sidewalls 24.1, 24.2 may initially come into contact with the sides of fiber array component 14, with the tapering configured to provide a centered guiding of fiber array component 14 toward waveguide array component 16 in a manner that assists in lining up features for passive alignment (i.e., drive the initial coarse alignment), as discussed below. The inward tapering of sidewalls 24.1, 24.2 is best shown in FIG. 4.

[0051] Shroud 12 may be further configured to include a downwardly tapering ceiling 26, as shown in FIG. 4, which also assists in directing fiber array component 14 downward toward the surface of waveguide array component 16 to facilitate the mating of the alignment features during the passive alignment process. Also shown in FIG. 4 is an interior vertical wall 28 that may be included in shroud 12 and used as a physical stopping point for the insertion of fiber array component 14. In preferred embodiments, however, alignment recesses directly formed in waveguide array component 16 may be used to control the positioning of fiber array component 14 in a manner that precisely controls the z-direction spacing gap g between the endface of the waveguide array formed in component 16 and endface of the fiber array supported on component 14 as shown in FIG. 6 (e.g., precision control on the order of a few microns, as described in detail below).

[0052] It is to be understood that various configurations of shroud 12 may or may not include all of the interior features as described above in association with FIG. 4. For example, in some cases the inwardly tapering sidewalls may be omitted; in other cases the downwardly tapering ceiling may be omitted. As mentioned above, the use of the interior vertical wall as a z-direction stop may likely be replaced by alignment features formed on waveguide array component 16.

[0053] Indeed, an important aspect in the provision of passive alignment between fiber array component 14 and waveguide array component 16 is associated with the formation of alignment features on the mating surfaces of the two components. Advantageously, the use of silicon-based or glass-based structures for these components allows for well-known semiconductor processing techniques to be used to pattern and etch these surfaces to form lithographically-defined features such as V- grooves and ridges with a sub-micron level of precision. Examples of the use of this type of mating alignment features for mating a fiber array to a waveguide array are described in detail in US Patent 11,886,013 entitled "Passive-Aligned Fiber Array to Waveguide Configuration," issued to the applicant of this disclosure on January 30, 2024 and co-pending US Application No. 18 / 539,386 with the same title and filed on December 14, 2023, with both herein incorporated by reference.

[0054] FIGs. 5 and 6 illustrate certain aspects of the type of alignment described in detail in the above-referenced issued patent, where these aspects are considered as useful in understanding the benefits provided by incorporating the inventive shroud and the releasable type of passive alignment that may be achieved between fiber array component 14 and waveguide array component 16 in accordance with the principles of the present invention.

[0055] With reference to FIG. 5, a top view of waveguide array component 16 and fiber array component 14 is shown, with arrows indicating the direction of movement for fiber array component 14 to come into alignment with waveguide array component 16. Waveguide array component 16 is shown as including a waveguide array 30 that is formed within a top surface portion of component 16, the array shown as comprising a plurality of individual waveguides 30.1, 30.2, ..., 30. N. In this example, a plurality of alignment ridges 40 is used in combination with waveguide array 30, with each individual waveguide 3O.i (i = 1, 2, ..., N) disposed within an associated alignment ridge 4O.i (i= 1, 2, ..., N), as illustrated in the end-view inset of waveguide 30. i and alignment ridge 40. i in FIG. 5.

[0056] A pair of recessed features 48.1, 48.2 is also shown in FIG. 5 as formed in waveguide array component 16. Recessed features 48.1, 48.2 are created to extend a precisely-controlled length Lz from sidewall 16S of waveguide array component 16 and may be used to control the z-direction gap spacing between the endfaces of waveguide array 30 and fiber array 32. In particular, upon placement of fiber array component 14 over waveguide array component 16, back edges 48E.1, 48E.2 of recessed features 48.1, 48.2 function as physical "stops" for fiber array component 14 in a manner that controls the z-direction gap spacing g between the facing end terminations of waveguide array 30 and fiber array 32. The endfaces of the individual waveguides 30.1, 30.2, ..., 30. N are shown as terminating along / near sidewall 16S of component 16. Fiber array component 14 is shown as supporting an optical fiber array 32 that is disposed within an associated V-groove array 34. The endfaces of the individual fibers forming fiber array 32 (i.e., 32.1, 32.2, ..., 32.N) are shown as terminating along a common reference plane EF in FIG. 5.

[0057] A forward section 36 of fiber array component 14 beyond reference plane EF functions as the alignment portion of component 14 that will overlap and engage with waveguide array component 16 in a manner that provides x-y passive alignment with a sub-micron level of accuracy, while also forming a controlled z-direction gap spacing g on the order of a few microns between the aligned arrays. In particular, forward section 36 is shown as including a set of alignment features 38 (here, V-grooves) that will mate with a corresponding set of alignment features 40 (here, ridges) formed in waveguide array component 16 as fiber array component 14 is brought into position over waveguide array component 16 (with the assistance of shroud 12, not shown in this view). In particular, V-grooves 38 will engage with alignment ridges 40 in a manner that results in passively aligning fiber array 32 with waveguide array 30 to provide maximum coupling efficiency (e.g., a sub-micron level of x-direction and y-direction alignment, with a fixed gap spacing g on the order of a few microns). FIG. 6 is a top view of the same two components 14 and 16 as shown in FIG. 5, in this case after fiber array component 14 is brought into engagement with waveguide array component 16 such that fiber array 32 is in alignment with waveguide array 30. That is, alignment V-grooves 38 are positioned over and engaged with alignment ridges 40 in a manner that forms the desired passive alignment along the x-axis and y-axis directions with a sub-micron level of accuracy. The z-axis controlled gap g between fiber endface plane EF and waveguide array sidewall termination 16S is also shown in the view of FIG. 6. The overlap between fiber array component 14 and waveguide array component 16 is defined by the position of front edge 36E of fiber array component 14 against back edges 48E.1, 48E.2 of recessed features 48.1 and 48.2 of waveguide array component 16, respectively.

[0058] FIG. 7 is a cut-away side view of the arrangement of FIG. 6, and particularly shows the gap spacing g (enlarged for illustrative purposes) between the end terminations of a waveguide 3O.i and an associated fiber 32.i.

[0059] It is to be understood that the particular arrangement of alignment V-grooves 38 and alignment ridges 40 is exemplary only, and various other configurations of alignment features are possible to use in combination with the inventive shroud and releasable clamping member of the present invention. For example, alignment ridges may be formed beyond the first and last waveguides ("above" and "below" in the top- down view of FIG. 5), with alignment V-grooves similarly formed on either side of the fiber array. FIGs. 8 - 10 illustrate this particular configuration of the elements forming passive alignment between V-grooves and alignment ridges disposed beyond the boundaries of their associated arrav structures.

[0060] FIG. 8 is an isometric view of an example fiber array component 14A which includes only a pair of alignment V-grooves 38A.1, 38A.2, which is formed in defined locations along a forward secHon 36A of fiber array component 14A. Fiber array 32 and fiber-supporting V-grooves 34 may be essentially the same as the elements discussed in association with FIGs. 5 and 6. Here, alignment V-groove 38A.1 is shown as disposed to the left of first fiber 32.1 (in the orientation of FIG. 8) and similarly, alignment V-groove 38A.2 shown as disposed to the right of the Nthfiber 32.N. This is only one example; other configurations may include one or more alignment V-grooves 38 disposed at interior locations between groups of fibers, particularly when a relatively large fiber array is being used.

[0061] FIG. 9 is a top view of fiber array component 14A as engaged and passively aligned with a waveguide array component 16A. As best shown in following FIG. 10, a pair of alignment ridges 40 A.1, 40A.2 is formed within the top surface of waveguide array component 16A at pre-defined locations that are designed to mate with alignment V-grooves 38A.1, 38A.2 of fiber array component 14A to achieve passive alignment. FIG. 10 is a cut-away side view of the arrangement of FIG. 9 that illustrates the engagement between alignment V-grooves 38 A and alignment ridges 40 A. An enlargement of an end portion of the passively-aligned structure is also shown in FIG. 10.

[0062] FIG. 11 is a rear isometric view of the arrangement of FIG. 6 in combination with shroud 12 in position over waveguide array component 16. Shroud 12 is depicted as transparent in this view so as to best illustrate the engagement between alignment V- grooves 38 and alignment ridges 40, as used to provide passive optical alignment between waveguide array 30 and fiber array 32 in the manner discussed above in association with FIGs. 5 and 6. It is to be understood that shroud 12 functions in the same manner with waveguide array component 16A, as discussed above in association with FIGs. 8-10.

[0063] In accordance with the principles of the present invention, shroud 12 may be formed to include tapered walls (sidewalls, ceiling, etc.) that facilitate a "centering" movement of fiber array component 14 with respect to waveguide array component 16 during assembly, driving the initial, coarse alignment that thereafter allows the included alignment features to achieve a final "precise" passive alignment in an efficient manner. Here, FIG. 11 depicts shroud 12 as including a pair of inwardly tapering sidewalls 24.1, 24.2, as well as a downwardly tapering ceiling 26. The tapering has been found to initially guide the positioning of fiber array component 14 with respect to waveguide array component 16 in a manner that allows for alignment features 38, 40 to provide an additional degree of passive optical alignment. As will be discussed below in association with FIGs. 13 - 16, the application of a downward force (releasable) from clamping member 20 through shroud 12 and onto fiber array component 14 provides and maintains the final, precise passive optical alignment

[0064] FIG. 12 is a top isometric view of the same arrangement as shown in FIG. 11, where shroud 12 is depicted in its solid form (as opposed to the transparent illustration of FIG. 11). The positioning of forward section 36 of fiber array component 14 over waveguide array component 16 is evident in this view. Also clearly shown in this view is the configuration of inwardly tapering sidewalls 24.1, 24.2 of shroud 12. As will be described in detail below in association with FIGs. 13 - 16, a downward force (y- direction) may be applied through aperture 22 of shroud 12 to maintain fiber array component 14 in passive alignment with waveguide array component 16 without requiring permanent attachment between the two components (as is conventionally the case in the prior art). By eliminating the need to permanently bond / attach fiber array component 14 to waveguide array component 16, it is now possible to easily remove and replace a defective / damaged fiber array by releasing the force applied through aperture 22.

[0065] In particular, FIG. 13 is an isometric view of optical interconnection assembly 10 as formed in accordance with the teachings of the present invention to include a releasable clamping member 20. As shown, releasable clamping member 20 is positioned over shroud 12 and is attached thereto using a suitable type of releasable force (e.g., magnetic, mechanical, spring-loaded, etc.). The combination of shroud 12 and releasable clamping member 20 is used to maintain the achieved passive alignment, as well as control the releasable attachment and alignment of fiber array component 14 with respect to waveguide array component 16. As mentioned above, the final assembly step of optical interconnection assembly 10 may be to position releasable clamping member 20 on top of shroud 12 after fiber array component 14 has been inserted in place. FIG. 14 is a view from the underside of one exemplary embodiment of clamping member 20. In this example arrangement, clamping member 20 includes a magnet 42, which may be used in combination with a shroud 12 formed of a magnetic material to create a natural attraction, and thus a releasable attachment of the components. The applied force maintains fiber array component 14 in place, securing both micron-level gap spacing in the z direction and sub-micron alignment in the x and y directions. A sufficient external force may be applied to clamping member 20 to overcome the magnetic attraction when required to release clamping member 20 from shroud 12. Once released, fiber array component 14 may be removed, if necessary.

[0066] Continuing with reference to FIG. 14, releasable clamping member 20 is shown as further comprising a vertical pin 44 and a handling lid 46. Vertical pin 44 is shown as extending downward from the center of magnet 42, with handling lid 46 disposed over the top of magnet 42. Vertical pin 44 is sized so as to pass through aperture 22 of shroud 12 (as shown in FIG. 15, discussed below) and thus provide a downward force onto a surface 14B (see FIG. 13) of fiber array component 14. The force applied in accordance with the principles of the present invention is sufficient to hold fiber array component 14 in place, that is, in the achieved precise alignment with waveguide array component 16. A lower end termination 44E of vertical pin 44 may be coated with a compliant material (or have a compliant element bonded thereto) to manage the force applied to surface 14B of fiber array component 14, as shown in FIG. 12. Lower end 44E may also be slightly angled to assist in urging front edge 36E of fiber array component 14 against back edges 48E.1, 48E.2 of recessed features 48.1 and 48.2, respectively in a manner that maintains gap spacing g at the desired position.

[0067] Handling lid 46 may be included in an example configuration for handling purposes; that is, to assist in proper placement of clamping member 20 over shroud 12 such that pin 44 easily passes through aperture 22, as well as a surface on which a force may be applied when desired to remove releasable clamping member 20.

[0068] FIG. 15 is a cut-away side view of optical interconnection assembly 10 that illustrates the y-axis and z-axis controls and passive alignment between waveguide array 30 and fiber array 32 that are facilitated by including shroud 12 and clamping member 20 to provide passive alignment in a releasable manner. The view of FIG. 15 shows fiber array component 14 fully engaged with waveguide array component 16 in a manner such that fiber array 32 is in passive alignment with waveguide array 30. The cut-away view of shroud 12 in FIG. 15 shows the angle of its included downwardly tapering ceiling 26. Including the tapering along ceiling 26 is contemplated to assist in driving fiber array component 14 downward and forward upon insertion in shroud 12, in the direction of the top surface of waveguide array component 16. The location of recessed feature 48.1 is also shown is this view, and illustrates the use of its back edge 48E.1 as a physical stop for front edge 36E of fiber array component 14. This positioning thus provides a controlled z-axis gap spacing g between waveguide array 30 and fiber array 32. The ability to utilize precision fabrication techniques for fiber array component 14 and waveguide array component 16 allows for the z-axis direction gap g to be controlled to maintain a value on the order of a few microns (e.g., five microns or less).

[0069] Also shown in the side view of FIG. 15 is releasable clamping member 20, which is disposed over and attached (releasably) to shroud 12 in the manner described above. In this side view, magnet 42 and vertical pin 44 of clamping member 20 are explicitly shown. In particular, vertical pin 44 is shown as sized to pass through aperture 22 formed in shroud 12 and come to rest against a defined surface 14B of fiber array component 14. Therefore, when clamping member 20 is positioned over and attached to shroud 12, vertical pin 44 provides a downward force onto fiber array component 14 (as indicated by the arrow) and thus holds fiber array component 14 in place in its precisely aligned position with respect to waveguide array component 16. Therefore, as long as clamping member 20 remains attached to shroud 12, the force applied by vertical pin 44 maintains the positioning of fiber array component 14 with respect to waveguide array component 16. Indeed, the downward force applied by vertical pin 44 ensures that fiber array 32 remains in x-direction and y-direction optical alignment with waveguide array 30 with sub-micron accuracy, with the z-direction gap spacing g maintained at a few micron value. This alignment is achieved and maintained without the need to utilize any bonding material, which is prevalent in prior art arrangements. Since bonding is not required, fiber array component 14 may be removed and replaced, as necessary, simply by removing clamping member 20 (perhaps by gripping lid 46 and pulling to release the magnetic attraction) and releasing the hold of vertical pin 44.

[0070] FIG. 16 is a view of the same components as shown in FIG. 15, in this case a cutaway end view that particularly illustrates the passive alignment between waveguide array 30 and fiber array 32 along the x-axis direction (indicated by reference to an example waveguide 30. i and aligned fiber 32.i). The mating between alignment V- grooves 38 (formed in fiber array component 14) and alignment ridges 40 (formed on waveguide array component 16) is also shown. Inwardly tapering sidewalls 24.1, 24.2 of shroud 12 are also shown in this view. As mentioned above in association with the discussion of FIGs. 5-10, the use of silicon or glass materials in the formation of components 14 and 16 allows for well-known patterning and etching process techniques to be used to form features 38, 40, and 48 with a precision that achieves precise passive alignment between waveguide array 30 and fiber array 32.

[0071] The width W12 of the front opening of shroud 12 is shown in this view as sized to surround the sidewalls of waveguide array component 16, supporting component 16 in a defined relationship with shroud 12.

[0072] Continuing with reference to FIG. 16, included releasable clamping member 20 is shown in position over shroud 12, where clamping member 20 is configured to use a releasable force (such as magnetic, mechanical, spring-loaded, or the like) to hold fiber array component 14 in place with respect to waveguide array component 16. In this example, magnet 42 and vertical pin 44 are used to provide the releasable downward (y -direction) force on fiber array component 14 with respect to waveguide array component 16.

[0073] While the configuration of clamping member 20 is shown as using a magnetic force to provide releasable downforce attachment, it is to be understood that other configurations (for example, a screw in combination with a threaded aperture, a mechanical latching mechanism, a spring-loaded pogo pin, or the like) may be used to provide releasable atachment between clamping member 20 and fiber array component 14 and are considered to fall within the scope of the present invention. FIG. 17 contains an isometric view, and FIG. 18 a cut-away side view, of an example mechanical-based releasable clamping member 20A. Referring to both FIGs. 17 and 18, an exemplary shroud 12A is formed to include a threaded aperture 22A. Releasable clamping member 20A comprises a screw 21 that is configured to be inserted into threaded aperture 22A (best shown in FIG. 18) and rotated until a sufficient downward force is placed against surface 14B of fiber array component 14. In this particular arrangement, a compliant member 23 is formed on the underside of shroud 12A at the location where it is desired to apply the downward force onto fiber array component 14. Obviously, the force may be released by removing screw 20A, which will allow for fiber array component 14 to be pulled out of the assembly. In these other examples of an acceptable configuration for the releasable clamping member, it is to be understood that while shroud 12 is not required to be a magnetic material, it may be preferred to utilize a material with a GTE similar to that of fiber array structure 14 to prevent unwanted misalignments during changes in ambient temperature of the aligned assembly.

[0074] The principles of the present invention have been described thus far in association with an embodiment where the shroud is designed to surround both the waveguide array component and the fiber array component. In another embodiment, described below in association with FIGs. 19-24, the inventive shroud is formed to be positioned directly on the waveguide array component, with the fiber array component thereafter inserted into place in a manner that achieves releasable passive alignment in an arrangement similar to that discussed above.

[0075] FIG. 19 is an isometric view of an optical interconnection assembly 100 formed in accordance with this alternative embodiment of the present invention, illustrating an example shroud 120 used to facilitate passive alignment between a fiber array component 140 and a waveguide array component 160. In this example, shroud 120 is configured to be positioned on a top surface 160T of waveguide array component 160 and specifically located on alignment features formed on top surface 160T of waveguide array component 160. The alignment features used to position shroud 120 in this alternative embodiment may take the form of markings on top surface 160T, raised features formed on top surface 160T, recessed features, or any other suitable type of feature. Fiber array component 140 is shown as positioned within a front opening formed in shroud 120. More particularly and similar to the above-described embodiment, in the assembly of the components, fiber array component 140 is inserted through a front opening in shroud 120 and guided by the interior topology of shroud 120 (e.g., tapered walls and ceiling) into an initial, coarse passive alignment with waveguide array 160. As discussed further below, specific alignment features on waveguide array component 160 and fiber array component 140 are then used to facilitate the completion of the alignment process from this initial, coarse degree of alignment to a final, precise degree of passive optical alignment. The releasable downward force applied through shroud 120 (from a releasable clamping member 200, described below) ensures the proper seating of fiber array component 140 on waveguide array component 160 and maintains this final, precise passive alignment. The dimensions and positioning of the waveguide-to-fiber alignment features may be controlled to result in a sub-micron level of passive alignment between waveguide array 300 and fiber array 320.

[0076] In an exemplary embodiment, the alignment features formed on waveguide array component 160 may comprise etched recesses 170 and in one example may take the form of a pair of etched recesses 170.1, 170.2 better shown in FIGs. 20 and 21, for example. In this embodiment, etched recesses 170 function to define both the location placement for shroud 120 and a "stop" for fiber array component 140 (similar in function to recessed features 48, discussed above) to control the spacing of the gap g between the endface of waveguide array 300 and fiber array 320.

[0077] More particularly, shroud 120 may be formed to include a pair of sidewalls 124.1, 124.2 that are sized and spaced-apart such that they rest within etched recesses 170.1 and 170.2, respectively, as shown in FIG. 19. As shown in FIG. 19, the positioning of shroud 120 in this manner leaves the interior area open for fiber array component 140 to be inserted. Sidewalls 124.1, 124.2 may be formed as inwardly-tapering sidewalls, similar to the first embodiment described above. A downwardly -tapering ceiling may also be included in shroud 120.

[0078] As mentioned above and described in more detail below, the ability to precisely fabricate shroud 120 with well-controlled manufacturing tolerances allows for the exterior dimensions of shroud 120, as well as its tapered interior surfaces, to enable precise positioning of shroud 120 within etched recesses 170.1, 170.2 of waveguide array component 160. In this embodiment where the shroud is sized to be positioned on the waveguide array component (instead of surrounding the waveguide array component, as described above), the width W120 of the opening of shroud 120 needs to be greater than the width Wrio of fiber array component 140. Additionally, if sidewalls 124 exhibit a tapered form, the most narrow spacing between the sidewalls must also be greater than W140. As a result, the controlled dimensions of recesses 170.1, 170.2 and fiber array component 140 work together to provide the z-direction controlled spacing gap g between fiber array 320 and waveguide array 300 as shown in FIG. 20.

[0079] Continuing with reference to FIG. 19, an aperture 122 is shown as formed through a top surface of shroud 120 and in accordance with the teachings of the present invention may be used (in combination with a releasable clamping member, discussed below in association with FIG. 24) to accept a downward force for releasably securing fiber array component 140 in an optically aligned position with respect to waveguide array component 160 (similar to the embodiment discussed above). Indeed, the application of the downward force allows for the final, sub-micron level of passive optical alignment along the x and y directions to be maintained, as well as force the front edge of fiber array component 140 to remain in contact with back edges 170E.1, 170E.2 of recesses 170.1, 170.2, respectively. The required precise passive optical alignment, as well as the preferred releasable type of connection, is thus provided by the combination of shroud 120 and an associated releasable clamping mechanism in accordance with the principles of this embodiment of the present invention (discussed below in association with FIG. 24). FIG. 20 is a view of the embodiment shown FIG. 19 with shroud 120 removed for illustrative purposes. Here, the positioning of waveguide array 300 with respect to fiber array 320 is evident, including a gap spacing g in the z-axis direction. Again, the z- direction gap spacing is controlled by forming etched recesses 170 to exhibit a defined length Lz such that a front edge 360E of fiber array component 140 will come to rest against a back edge 170E of each etched recess 170 (i.e., against back edges 170E.1, 170E.2).

[0080] FIG. 21 is an enlarged view of waveguide array component 160 from the views of FIGs. 19 and 20, showing the defined locations of etched recesses 170.1, 170.2 as formed in top surface 160T of waveguide array component 160. Etched recesses (particularly those formed using a DRIE process) are only one type of suitable alignment feature that may be utilized to define and control both the location of shroud 120 with respect to waveguide array component 160, as well as the overlap of fiber array component 140 with respect to waveguide array component 160 (the latter criteria used to define and control the gap spacing g between the endfaces of the aligned arrays). Other types of alignment features (e.g., raised features such as guiding rails) may be used to control the positioning of shroud 120 with the required sub-micron accuracy.

[0081] The length Lz is shown in FIG. 21 as defining the distance between a back edge 170E of etched recesses 170.1, 170.2 and front edge 160E of waveguide array component 160. For the sake of completeness, waveguide array 300 and alignment ridges 400 (as shown in FIGs. 22 and 23) are also shown as formed on / within waveguide array component 160.

[0082] A cut-away side view of the configuration of FIG. 19 is shown in FIG. 22, which clearly illustrates the controlled gap spacing g achieved between waveguide array 300 and fiber array 320. Also shown in FIG. 22 is the location of etched recess 170.1 and the location of front edge 360E of fiber array component 140 against the back edge 170E.1 of etched recess 170.1. The view of FIG. 22 particularly illustrates the location of back edge 170E.1 as defined by the spacing Lz with respect to the front edge 160E of waveguide array component 160. The ability to pattern and etch component 160 (which is typically a silicon-based or glass-based photonic integrated circuit component) with micron-level accuracy ensures the ability to control this gap spacing. Aperture 122 of shroud 120 is also shown in FIG. 22, illustrating the location for the application of a removable downward force against surface 140B of fiber array component 140, which is used for holding fiber array component 140 in place in a releasable manner.

[0083] FIG. 23 is a cut-away end view of the same arrangement as shown in FIGs. 19-22, in this case illustrating the x-direction passive alignment achieved between waveguide array 300 and fiber array 320. Here, the positioning of fiber array component 140 within shroud 120 is clearly shown. In this embodiment, the width W120 of the opening in shroud 120 is designed to surround (capture) the width W140 of fiber array component 140 (as also shown in FIG. 19, discussed above). Engagement between alignment V- grooves 380 and alignment ridges 400 is also shown in FIG. 23. Again, it is to be understood that this alternative embodiment of the present invention may also use any suitable type of passive alignment features to provide coupling between waveguide array 300 and fiber array 320. For example, but not considered to be limiting, the use of paired alignment features such as discussed about in association with FIGs. 8-10 may also be used here.

[0084] FIG. 24 is a side view similar to that of FIG. 22, but in this case also illustrating a releasable clamping member 200. In accordance with the principles of the present invention, a releasable clamping member 200 is used in combination with shroud 120 to provide releasable connection between fiber array component 140 and waveguide array component 160. Similar to the previous embodiment, releasable clamping member 200 is shown in this example as including a magnet 420 and vertical pin 440 extending downward below magnet 420, with a handling lid 460 disposed over magnet 420. Vertical pin 440 is sized to pass through aperture 122 of shroud 120 (see FIG. 19) and provide a downward force on surface 140B of fiber array component 140. In accordance with the principles of the present invention, the presence of this downward force helps to drive, and thereafter maintain, the precision passive alignment between the waveguide and fiber arrays (not particularly shown in this view). For example, the x- direction and y-direction alignments may be maintained with a sub-micron level of precision, while the z-direction gap spacing g may be maintained at a value of a few microns. The use of a releasable force (in this case, a magnetic force) allows for clamping member 200 to be removed from shroud 120 such that vertical pin 440 is lifted from fiber array component 140. Thus, fiber array component 140 may be removed and a different fiber array component (of same form and dimensions) inserted in its place and passively aligned with waveguide array component 160.

[0085] Again, it is to be understood that the use of a magnetic type of releasable clamping member is only one possible embodiment. The use of a releasable mechanical force, such as described above in association with FIGs. 17 and 18, is equally applicable for use in this embodiment, as well as other types including, but not limited to, latching mechanisms or spring-loaded configurations.

[0086] Summarizing, in accordance with the principles of this embodiment of the present invention, the ability to form alignment features on waveguide array component 160 with a sub-micron accuracy allows for a shroud 120 (also formed to precise dimensions) to be directly mounted on waveguide array component 160 and positioned using the alignment features. For example, etched recesses 170.1, 170.2 may be formed at defined positions that enable fiber array component 140 to be inserted through the front opening of shroud 120 and come into passive alignment with waveguide array 160. It is contemplated that a process such as deep reactive ion etching (DRIE) may be used for the formation of etched recesses 170.1, 170.2, creating the features at precise locations with respect to a front edge 160E of waveguide array component 160, for example, to achieve this level of accuracy.

[0087] In some cases, it may be preferred to limit the direct contact between a fiber array component and a covering shroud. With particular reference to FIGs. 19 and 23, this embodiment allows for the side surfaces of fiber array component 140 to contact and slide along the interior sidewall surfaces 124.1, 124.2 (which may be tapered) of shroud 120 as it is moved into its passively aligned position with respect to waveguide array component 160. The sliding movement of fiber array component 140 (which is typically a silicon-based or glass-based component) against sidewall surfaces 124 of shroud 120 (which may be in some cases a magnetic material such as Kovar), may cause some chipping or other type of damage to fiber array component 140, particularly in applications where it is contemplated that fiber array component 140 may need to be removed and replaced several times.

[0088] Another embodiment of the present invention, as shown in FIGs. 25-28, addresses this potential for damage by configuring a shroud 220 formed in accordance with the present invention to include a fiber array cover 250 that is positioned over fiber array component 140 prior to introducing the fiber array component into alignment with waveguide array component 160. FIG. 25 is an isometric view particularly illustrating the placement of fiber array cover 250 over fiber array component 140 (fiber array component 140 not visible in this view).

[0089] In this example, fiber array cover 250 includes an optional lower extension portion 252 that is configured to also support fiber array 320 (i.e., a portion of array 320 that extends beyond fiber array component 140) in a fixed position. It has been found that including extension portion 252 helps to prevent movement of the individual fibers forming array 320 as the complete fiber array component 140 is being moved into its passively aligned position with waveguide array component 160 (similar to the use of element 13 in the arrangement shown in FIG. 1). However, the inclusion of lower extension portion 252 is not required, and may be omitted in certain applications. Fiber array cover 250 (as well as lower extension portion 252, when present) may be fabricated using a process such as high accuracy injection molding of a material such as a metal or polymer (for example, a polymer with a GTE comparable to that of both shroud 220 and fiber array component 140). As with the elements discussed above, it is important to tightly control the dimensions of fiber array cover 250 in order to provide, as well as maintain, passive alignment between the waveguide and fiber arrays with a sub-micron level of accuracy. Fiber array cover 250 is shown in FIG. 25 as sized to slide within the opening of shroud 220 (as, for example, by utilizing an injection molding process for the sizing) and thus achieve the proper positioning of fiber array component 140 with respect to waveguide array component 160. As particularly shown, fiber array cover 250 is formed to have a width W250 only slightly less than the width W220 of shroud 220, allowing for the combination of fiber array component 140 and fiber array cover 250 to be introduced into the aligned arrangement of waveguide array component 160 and shroud 220 in a manner that facilitates passive optical alignment between waveguide array 300 and fiber array 320 (as shown in FIG. 26). As shown in the separate view of shroud 220 depicted in FIG. 25, the opening width W220 is defined as extending between the inside edges of sidewalls 224.1 and 224.2 (which may or may not be formed as inwardly tapering sidewalls). In order to accommodate fiber array cover 250, it is further required that the height H220 of the shroud opening be larger than the height H250 of fiber array cover 250.

[0090] Continuing with reference to FIG. 25, the downward y-direction releasable force applied by a clamping member (not shown) is shown to pass through an aperture 222 of shroud 220, in a manner similar to the embodiment of FIGs. 16-19. In this case, however, the downward force is applied to the upper surface 250U of fiber array cover 250 instead of directly against fiber array component 140 itself (as used in the embodiment of FIGs. 21-24). The application of the downward force on cover 250 may be preferred in some applications, particularly where fiber array component 140 may be relatively thin or otherwise fragile and subject to damage in the presence of an applied force.

[0091] FIG. 26 is a view of the same components as shown in FIG. 25, where in this case fiber array cover 250 (including lower extension 252) is shown as transparent in view, allowing for the presence and position of fiber array component 140 and included fiber array 320 to be visible (as best shown in FIG. 27). The use of extension portion 252 to hold fiber array 320 in place is clearly seen in this view. FIG. 27 is a cut-away side view of the embodiment of the present invention as shown in FIGs. 25 and 26. The positioning of cover 250 on fiber array component 140 is clearly shown, as well as the application of the downward (releasable) force through aperture 222 against upper surface 250U of fiber array cover 250, well removed from direct contact with surface 140B of fiber array component 140.

[0092] The use of fiber array cover 250 to protect fiber array component 140 from direct contact with shroud 220 is particularly evident in the cut-away end view of FIG. 28. The width W250 of fiber array cover 250 is shown as being only slightly less than the width W220 of the opening in shroud 220. Sidewalls 142.1 and 142.2 of fiber array component 140 are shown as being held within the opening of fiber array cover 250, thus removed from the possibility of direct contact with sidewalls 224.1, 224.2 of shroud 220.

[0093] The foregoing description is intended to enable any person skilled in the art to make and use the disclosure, and is provided in the context of a particular application and its requirements. Moreover, the foregoing descriptions of embodiments of the present disclosure have been presented for purposes of illustration and description only. They are not intended to be exhaustive or to limit the present disclosure to the specific configurations as described. Accordingly, many modifications and variations will be apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of the present disclosure. Additionally, the discussion of the preceding embodiments is not intended to limit the present disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein and defined by the claims appended hereto.

Claims

What is claimed is:

1. An optical interconnection assembly for facilitating releasable passive alignment between an array of optical waveguides formed within a waveguide array component and an array of optical fibers positioned on a fiber array component, the optical interconnection assembly comprising: a shroud configured to be disposed over at least the fiber array component, the shroud including a front opening sized to accommodate an insertion of the fiber array component and an aperture through a top surface thereof, a shaping of the shroud configured to facilitate passive alignment positioning of the fiber array component with respect to the waveguide array component; and a releasable clamping member disposed over and releasably attached to the shroud, the releasable clamping member configured to impart a downward force on the fiber array component sufficient to hold it in a passively aligned position with respect to the waveguide array component as long as the releasable clamping member maintains attachment to the shroud, wherein a removal of the releasable clamping member eliminates the downward force and enables the fiber array component to be retracted from its passively aligned position.

2. The optical interconnection assembly as defined in claim 1, wherein the shaping of the shroud is configured to include inwardly -tapering sidewalls for contacting sidewalls of the fiber array component and guiding an initial passive alignment with respect to the waveguide array component.

3. The optical interconnection assembly as defined in claim 1, wherein the shaping of the shroud is configured to include a downwardly-tapering ceiling for contacting a portion of the fiber array component and guiding movement of the fiber array component toward an initial passive alignment with respect to the waveguide array component. i4. The optical interconnection assembly as defined in claim 1, wherein the shaping of the shroud is configured to include an interior vertical wall at a defined rear location for preventing insertion of the fiber array component beyond a defined position, controlling an optical axis gap spacing between the array of optical waveguides and the array of optical fibers.

5. The optical interconnection assembly as defined in claim 1, wherein the waveguide array component is formed to include a plurality of recessed features at predefined locations on the top surface thereof, the plurality of recessed features defined as exhibiting a predetermined length Lz with respect to a front edge of the waveguide array component selected to provide a z-direction defined gap spacing g between endfaces of the waveguide array and the fiber array upon placement of the fiber array component to overlap the waveguide array component such that a front edge of the fiber array component rests against a rear edge of the plurality of recessed features.

6. The optical interconnection assembly as defined in claim 1, wherein the shroud is sized to surround a pair of opposing sidewalls of the waveguide array component.

7. The optical interconnection assembly as defined in claim 1, wherein the waveguide array component is formed to include alignment features at predefined locations on the top surface thereof, with the shroud configured to be disposed in contact with the alignment features to facilitate passive alignment of the fiber array component with the waveguide array component as the fiber array component is inserted into the shroud.

8. The optical interconnection assembly as defined in claim 7, wherein the alignment features comprise a plurality of etched features formed within the top surface of the waveguide array component.

9. The optical interconnection assembly as defined in claim 8 wherein the plurality of recessed features takes the form of a pair of recessed features disposed in a spaced-apart relationship, and the shroud is formed to include a pair of opposing sidewalls, wherein the positioning of the pair of recessed features is defined to support the pair of sidewalls.

10. The optical interconnection assembly as defined in claim 9 wherein the pair of opposing sidewalls comprises a pair of inwardly tapering opposing sidewalls.

11. The optical interconnection assembly as defined in claim 9 wherein the shroud further comprises a downward-tapering ceiling for facilitating the movement of the fiber array component into passive alignment with the waveguide array component.

12. The optical interconnection assembly as defined in claim 7, wherein the shroud further comprises a protective cover disposed over the fiber array component, where the downward force provided by the releasable clamping member is applied against the protective cover.

13. The optical interconnection assembly as defined in claim 12, wherein the protective cover is formed of a high precision, injected molded material with a coefficient of thermal expansion (CTE) comparable to the CTE of the fiber array structure.

14. The optical interconnection assembly as defined in claim 12 wherein the protective cover includes a lower extended portion for supporting a length of the optical fiber array extending beyond a termination of the fiber array component.

15. The optical interconnection assembly as defined in claim 1, wherein the shroud is formed of a magnetic material and the releasable clamping member includes a magnet for utilizing a magnetic force to releasably attach to the shroud.

16. The optical interconnection assembly as defined in claim 15, wherein the releasable clamping member further comprises a vertical pin extending below a lower termination of the magnet, the vertical pin sized so as to pass through the aperture of the shroud upon positioning of the releasable clamping member on the shroud and impart a downward force onto the fiber array component.

17. The optical interconnection assembly as defined in claim 16, wherein the vertical pin further comprises a compliant element disposed on a distal termination thereof.

18. The optical interconnection assembly as defined in claim 16, wherein the vertical pin exhibits an angled end termination for providing an additional horizontal force pressing the fiber array component against a vertical wall stop formed in the waveguide array component.

19. The optical interconnection assembly as defined in claim 16, wherein the releasably clamping member further comprises a handling lid disposed over an upper, opposing termination of the magnet.

20. The optical interconnection assembly as defined in claim I, wherein the releasable clamping member comprises a threaded screw, and the aperture of the shroud is formed as a threaded aperture, the dimensions of the threaded screw and the threaded aperture controlled such that the rotation of the threaded screw within the threaded aperture imparts a releasable downward force on the fiber array component.

21. The optical interconnection assembly as defined in claim 1, wherein the releasable clamping member comprises a spring-loaded configuration including a vertical pin for passing through the aperture of the shroud.

22. The optical interconnection assembly as defined in claim 1, further comprising a fiber array guiding element disposed in proximity to the fiber array component, the fiber array guiding element utilized to maintain fixed positioning of individual fibers forming the array prior to placement on the fiber array component.

23. The optical interconnection assembly as defined in claim 1, further comprising a fiber array clamp located in proximity to the fiber array component, the fiber array clamp isolating the fiber array from external movements and forces, providing stress relief to the fiber array.

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