Optical engine packaging structure based on grating coupling

Abstract

The invention relates to the technical field of optical engines, and discloses an optical engine packaging structure based on grating coupling, which comprises a substrate, a silicon optical chip, an optical fiber array unit and an upper cover body, and is characterized in that the silicon optical chip is arranged on the substrate; the silicon optical chip is provided with a first coupling part and a positioning seat, and the positioning seat is provided with a light through hole which penetrates up and down and corresponds to the first coupling part. The optical fiber array unit comprises an optical fiber array and a fixing structure, a second coupling part is arranged on the lower side of the fixing structure, and the second coupling part is in light conduction with the optical fiber array; the upper cover body is installed on the substrate, the upper cover body is provided with an insertion hole corresponding to the positioning seat, and the fixing structure is detachably installed in the insertion hole; the upper cover body is movably provided with a pressing piece, and the pressing piece and the fixing structure are matched in an abutting mode in the axial direction of the light through hole during locking. A first alignment structure is arranged on the upper side of the positioning seat, and a second alignment structure is arranged on the lower side of the fixing structure; the second alignment structure and the first alignment structure are positioned and matched in the radial plane of the light through hole, and the second coupling part and the first coupling part are aligned up and down.

Description

Technical Field

[0001] The present invention relates to the technical field of light engines, and in particular to a light engine packaging structure based on grating coupling. Background Art

[0002] With the development of large-scale data centers and AI computing clusters, co-packaged optics (CPO) technology has played a significant role in improving data transmission rates. Silicon photonic chips are the core components of CPO technology, mainly used for photoelectric signal conversion, and form optical signal transmission with optical fiber arrays through coupling technology.

[0003] For example, the Chinese utility model patent with the authorization announcement number CN207181754U and the authorization announcement date of 2018.04.03 discloses a parallel optical fiber transceiver module, including an optical fiber array, an optical fiber base and an optical fiber cover. The optical fiber base and the optical fiber cover form a 90-degree corner assembly, which turns the fiber tail of the optical fiber array by 90 degrees. The optical fiber array is composed of an optical fiber positioning substrate, a cover plate and a plurality of optical fibers. The upper surface of the positioning substrate has a plurality of high-precision light positioning grooves. The optical fibers are placed in the positioning grooves and pressed with the cover plate, and then fixed with glue. The end faces of the optical fibers are accurately positioned and arranged in an array; the lower surface of the positioning substrate is provided with a square groove, and the upper side of the optical fiber base is provided with an arc surface with a 90-degree corner, and the optical fiber is closely attached to this surface. A small square boss is provided at the bottom of the optical fiber base.

[0004] The existing parallel optical fiber transceiver module realizes the arrangement of optical fibers at a 90-degree angle by combining an optical fiber base and an optical fiber cover. However, the optical fiber transceiver module is usually fixedly installed on the silicon photonic chip, which makes it difficult to ensure the coupling accuracy between the optical fiber end face and the chip waveguide, and it is impossible to take into account the requirements of coupling accuracy and flexible disassembly of the optical fiber array. Summary of the invention

[0005] The technical problem to be solved by the present invention is that the existing optical fiber transceiver module is fixedly installed on the silicon photonic chip, which makes it difficult to ensure the coupling accuracy between the optical fiber end face and the chip waveguide, and cannot take into account the requirements of coupling accuracy and flexible disassembly of the optical fiber array.

[0006] In order to solve the above technical problems, the present invention provides a technical solution of a light engine packaging structure based on grating coupling:

[0007] The grating-coupling-based light engine packaging structure includes a substrate, a silicon photonic chip, a fiber array unit, and an upper cover, wherein the silicon photonic chip is disposed on the upper side of the substrate, and the substrate is electrically connected to the silicon photonic chip;

[0008] A first coupling portion and a positioning seat are provided on the upper side of the silicon photonic chip, and a light through hole is provided through the upper and lower sides of the positioning seat, and the light through hole corresponds to the first coupling portion;

[0009] The optical fiber array unit includes an optical fiber array and a fixing structure. The fixing structure is fixedly connected to the optical fiber array. A second coupling part is provided on the lower side of the fixing structure, and the second coupling part is optically connected to the optical fiber array;

[0010] The upper cover is mounted on the upper side of the substrate. The upper cover is provided with a jack corresponding to the positioning seat, and the fixing structure is detachably mounted in the jack;

[0011] The upper cover is also movably provided with a pressing member. The pressing member has a locked state and an unlocked state. In the locked state, the pressing member is in pressing cooperation with the fixing structure along the axial direction of the light through hole;

[0012] A first alignment structure is provided on the upper side of the positioning seat, and a second alignment structure is provided on the lower side of the fixing structure; the second alignment structure is in positioning cooperation with the first alignment structure in the radial plane of the light through hole, and the second coupling part is vertically aligned with the first coupling part.

[0013] Further, the first alignment structure is a convex structure, and the second alignment structure is a groove structure; or, the first alignment structure is a groove structure, and the second alignment structure is a convex structure.

[0014] Further, the first alignment structure includes a transverse rib and a longitudinal rib. The transverse rib extends along a direction parallel to the width direction of the optical fiber array, and the longitudinal rib is perpendicularly arranged with the transverse rib in the radial plane of the light through hole;

[0015] The second alignment structure includes a transverse groove and a longitudinal groove. The transverse groove extends along a direction parallel to the width direction of the optical fiber array, and the longitudinal groove is perpendicularly arranged with the transverse groove in the radial plane of the light through hole;

[0016] The transverse rib is in concave-convex fit with the transverse groove, and the longitudinal rib is in concave-convex fit with the longitudinal groove.

[0017] Further, the light through hole has a first long side and a first short side. The first long side extends along the width direction of the optical fiber array, and the first short side is perpendicularly arranged with the first long side; there are two transverse ribs and two longitudinal ribs. The two transverse ribs are respectively arranged on the outer sides of the light through hole corresponding to the first long side, and the two longitudinal ribs are respectively arranged on the outer sides of the light through hole corresponding to the first short side;

[0018] The second coupling part has a second long side and a second short side. The second long side extends in the width direction of the fiber optic array, and the second short side is arranged perpendicular to the second long side. There are two transverse grooves and two longitudinal grooves. The two transverse grooves are respectively arranged on the outer sides of the second coupling part corresponding to the second long side, and the two longitudinal grooves are respectively arranged on the outer sides of the second coupling part corresponding to the second short side.

[0019] Further, the transverse ribs and the longitudinal ribs are arranged at intervals, and the transverse grooves and the longitudinal grooves are cross-connected.

[0020] Further, the cross-sectional profiles of the transverse ribs and the longitudinal ribs are both arc-shaped, and the cross-sectional profiles of the transverse grooves and the longitudinal grooves are both V-shaped.

[0021] Further, the pressing member is hinged to the upper cover body. An elastic pressing piece is arranged in the middle of the pressing member. The elastic pressing piece protrudes toward the side close to the substrate, and the elastic pressing piece and the pressing member are of an integral structure.

[0022] Further, a pressing part is further arranged on one side of the pressing member away from the hinge axis. Hooks are arranged on both sides of the pressing part in the width direction of the fiber optic array. A clamping groove is formed in the upper cover body. The pressing part and the clamping groove are in a receiving fit. A convex edge is arranged on the inner side of the clamping groove. The hooks and the convex edge are in a blocking fit.

[0023] Further, the optical through hole includes a first hole section and a second hole section arranged in sequence along the hole axis direction. The second hole section is located on the side of the first hole section away from the silicon photonic chip. The cross-sectional width of the first hole section is smaller than the cross-sectional width away from the second hole section. The second coupling part and the second hole section are in a receiving fit.

[0024] Further, the fixing structure includes a right-angled block and a pressing plate. The right-angled block includes a vertical section and a horizontal section fixedly connected. A wiring groove is formed in the middle of the horizontal section. The pressing plate is arranged parallel and at an interval to the vertical section. The fiber optic array is arranged in the wiring groove and the interval between the pressing plate and the vertical section, and the fiber optic array is adhesively connected to the right-angled block and the pressing plate respectively.

[0025] Compared with the prior art, a light engine packaging structure based on grating coupling of the present invention has the following beneficial effects: The light engine packaging structure based on grating coupling adopts a design form of a substrate, a silicon photonic chip, an optical fiber array unit, an upper cover body and a pressing member. The silicon photonic chip is arranged on the upper side of the substrate, and the silicon photonic chip is electrically connected to the silicon substrate. A first coupling portion and a positioning seat are arranged on the upper side of the silicon photonic chip, and the optical through hole of the positioning seat corresponds to the first coupling portion. The upper cover body is installed on the upper side of the substrate, and the upper cover body is provided with a jack corresponding to the positioning seat, and the fixing structure of the optical fiber array unit is detachably installed in the jack.

[0026] The upper cover body plays a physical protection role for the silicon photonic chip and the optical fiber array unit. By reasonably arranging the positioning seat, the optical through hole and the optical fiber array unit, the light engine packaging structure is made more compact, which is beneficial to reducing the volume of the light engine and meeting the requirements of miniaturization and integration. Since the optical fiber array unit is installed in a detachable manner, when maintenance, upgrade or replacement of the optical fiber array unit is required for the light engine, it can be taken out and installed from the packaging structure, improving the maintainability and flexibility of the packaging structure.

[0027] Wherein, a second coupling portion is arranged on the lower side of the fixing structure, and the second coupling portion is optically communicated with the optical fiber array. A first alignment structure is arranged on the upper side of the positioning seat, and a second alignment structure is arranged on the lower side of the fixing structure. By arranging the first coupling portion on the silicon photonic chip and the second coupling portion of the fixing structure, and using the first alignment structure of the positioning seat and the second alignment structure of the fixing structure to perform positioning and cooperation in the radial plane of the optical through hole, the second coupling portion and the first coupling portion are vertically aligned.

[0028] This alignment design can achieve high-precision optical coupling between the silicon photonic chip and the optical fiber array, improve the transmission efficiency of optical signals, reduce optical losses, and ensure the high-performance operation of the light engine. The optical through hole corresponds to the first coupling portion, and the second coupling portion is optically communicated with the optical fiber array, ensuring that the optical signal transmission path between the first coupling portion and the second coupling portion is in the closed space of the optical through hole, reducing possible interference and losses of the optical signal.

[0029] In addition, a pressing member is movably installed on the upper cover body, and the pressing member has a locked state and an unlocked state. In the locked state, the pressing member is in top-pressure cooperation with the fixing structure along the axis direction of the optical through hole. Combining the positioning and cooperation relationship of the first alignment structure and the second alignment structure in the radial plane of the optical through hole, the purpose of multi-dimensional precise positioning of the light ray array unit can be achieved. Locking the pressing member can prevent displacement or loosening caused by factors such as vibration and external force, ensuring the stability and reliability of optical coupling, and meeting the requirements of coupling accuracy and flexible disassembly of the optical fiber array unit. Brief Description of the Drawings

[0030] Figure 1 is a three-dimensional schematic diagram of the light engine packaging structure based on grating coupling in the embodiment of the present invention;

[0031] Figure 2 It is a schematic assembly diagram of an electrical chip, a silicon photonics chip, a positioning seat, and an optical fiber array unit in an embodiment of the present invention;

[0032] Figure 3 It is a schematic assembly diagram of an electrical chip, a silicon photonics chip, and a positioning seat in an embodiment of the present invention;

[0033] Figure 4 It is a three-dimensional schematic diagram of an optical fiber array unit (another perspective) in an embodiment of the present invention;

[0034] Figure 5 is Figure 1 a partial enlarged view of the pressing member and the upper cover body in

[0035] Figure 6 is Figure 1 a partial cross-sectional schematic diagram of an optical engine packaging structure based on grating coupling in

[0036] In the figure: 1. Substrate; 2. Silicon photonics chip; 21. First coupling part; 22. Positioning seat; 23. Optical through hole; 231. First long side; 232. First short side; 233. First hole section; 234. Second hole section; 24. First alignment structure; 24a. Transverse rib; 24b. Longitudinal rib; 3. Optical fiber array unit; 31. Optical fiber array; 32. Fixing structure; 321. Right-angled block; 321a. Vertical section; 321b. Horizontal section; 321c. Wiring groove; 322. Pressure plate; 33. Second alignment structure; 33a. Transverse groove; 33b. Longitudinal groove; 34. Second coupling part; 341. Second long side; 342. Second short side; 4. Upper cover body; 40. Jack; 41. Card slot; 42. Flange; 5. Pressing member; 51. Elastic pressing piece; 52. Pressing part; 53. Hook; 6. Electrical chip; 7. ASIC chip. Detailed implementation manners

[0037] The following combines the drawings and embodiments to further describe in detail the specific implementation manners of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0038] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. in the present invention is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation on the present invention.

[0039] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0040] In the present invention, unless otherwise clearly specified and defined, terms such as "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] As Figures 1 to 6 shown, a light engine packaging structure based on grating coupling according to an embodiment of the present invention, the light engine packaging structure includes a substrate 1, a silicon photonics chip 2, an optical fiber array unit 3, and an upper cover 4. The silicon photonics chip 2 is disposed on the upper side of the substrate 1, and the substrate 1 is electrically connected to the silicon photonics chip 2; a first coupling portion 21 and a positioning seat 22 are provided on the upper side of the silicon photonics chip 2, and a light through hole 23 is vertically formed through the positioning seat 22, and the light through hole 23 corresponds to the first coupling portion 21.

[0042] The optical fiber array unit 3 includes an optical fiber array 31 and a fixing structure 32. The fixing structure 32 is fixedly connected to the optical fiber array 31. A second coupling portion 34 is provided on the lower side of the fixing structure 32, and the second coupling portion 34 is optically connected to the optical fiber array 31; the upper cover 4 is mounted on the upper side of the substrate 1, and a jack 40 corresponding to the positioning seat 22 is provided on the upper cover 4, and the fixing structure 32 is detachably mounted in the jack 40.

[0043] The upper cover 4 is also movably installed with a pressing member 5. The pressing member 5 has a locked state and an unlocked state. In the locked state, the pressing member 5 is in pressing fit with the fixed structure 32 along the axial direction of the light through hole 23. A first alignment structure 24 is provided on the upper side of the positioning seat 22, and a second alignment structure 33 is provided on the lower side of the fixed structure 32. The second alignment structure 33 is in positioning fit with the first alignment structure 24 in the radial plane of the light through hole 23, and the second coupling portion 34 is vertically aligned with the first coupling portion 21.

[0044] The optical engine packaging structure based on grating coupling adopts the design form of a substrate 1, a silicon photonic chip 2, an optical fiber array unit 3, an upper cover 4 and a pressing member 5. The silicon photonic chip 2 is arranged on the upper side of the substrate 1. The silicon photonic chip 2 is electrically connected to the silicon substrate 1. A first coupling portion 21 and a positioning seat 22 are provided on the upper side of the silicon photonic chip 2. The light through hole 23 of the positioning seat 22 corresponds to the first coupling portion 21. The upper cover 4 is installed on the upper side of the substrate 1. The upper cover 4 is provided with a jack 40 corresponding to the positioning seat 22. The fixing structure 32 of the optical fiber array unit 3 is detachably installed in the jack 40.

[0045] The upper cover 4 plays a physical protection role for the silicon photonic chip 2 and the optical fiber array unit 3. By reasonably arranging the positioning seat 22, the light through hole 23 and the optical fiber array unit 3, the optical engine packaging structure is made more compact, which is beneficial to reducing the volume of the optical engine and meeting the requirements of miniaturization and integration. Since the optical fiber array unit 3 is detachably installed, when maintenance, upgrade or replacement of the optical fiber array unit 3 is required, it can be taken out and installed from the packaging structure, improving the maintainability and flexibility of the packaging structure.

[0046] Wherein, a second coupling portion 34 is provided on the lower side of the fixing structure 32. The second coupling portion 34 is in optical communication with the optical fiber array 31. A first alignment structure 24 is provided on the upper side of the positioning seat 22, and a second alignment structure 33 is provided on the lower side of the fixing structure 32. By providing the first coupling portion 21 on the silicon photonic chip 2 and the second coupling portion 34 of the fixing structure 32, and using the first alignment structure 24 of the positioning seat 22 to be in positioning fit with the second alignment structure 33 of the fixing structure 32 in the radial plane of the light through hole 23, the second coupling portion 34 is vertically aligned with the first coupling portion 21.

[0047] This alignment design can achieve high-precision optical coupling between the silicon photonic chip 2 and the optical fiber array 31, improve the transmission efficiency of optical signals, reduce optical losses, and ensure the high-performance operation of the optical engine. The light through hole 23 corresponds to the first coupling portion 21, and the second coupling portion 34 is in optical communication with the optical fiber array 31, ensuring that the optical signal transmission path between the first coupling portion 21 and the second coupling portion 34 is in the closed space of the light through hole 23, reducing possible interference and losses of optical signals.

[0048] In addition, a pressing member 5 is movably installed on the upper cover body 4. The pressing member 5 has a locked state and an unlocked state. In the locked state, the pressing member 5 is in pressing fit with the fixed structure 32 along the axial direction of the light through hole 23. Combining the positioning fit relationship between the first alignment structure 24 and the second alignment structure 33 in the radial plane of the light through hole 23 can achieve the purpose of multi-dimensional precise positioning of the light ray array unit. Locking the pressing member 5 can prevent displacement or loosening caused by factors such as vibration and external force, ensuring the stability and reliability of optical coupling, and meeting the requirements of coupling accuracy and flexible disassembly of the optical fiber array unit 3.

[0049] In this embodiment, the first alignment structure 24 is a convex structure, and the second alignment structure 33 is a groove structure. Specifically, the first alignment structure 24 includes a transverse rib 24a and a longitudinal rib 24b. The transverse rib 24a extends along the width direction of the optical fiber array 31, and the longitudinal rib 24b is perpendicularly arranged with the transverse rib 24a in the radial plane of the light through hole 23. The second alignment structure 33 includes a transverse groove 33a and a longitudinal groove 33b. The transverse groove 33a extends along the width direction of the optical fiber array 31, and the longitudinal groove 33b is perpendicularly arranged with the transverse groove 33a in the radial plane of the light through hole 23. The transverse rib 24a is in concave-convex fit with the transverse groove 33a, and the longitudinal rib 24b is in concave-convex fit with the longitudinal groove 33b.

[0050] As Figure 3 , Figure 4 shown, the light through hole 23 has a first long side 231 and a first short side 232. The first long side 231 extends along the width direction of the optical fiber array 31, and the first short side 232 is perpendicularly arranged with the first long side 231. There are two transverse ribs 24a and two longitudinal ribs 24b. The two transverse ribs 24a are respectively arranged outside the light through hole 23 corresponding to the first long side 231, and the two longitudinal ribs 24b are respectively arranged outside the light through hole 23 corresponding to the first short side 232. The second coupling portion 34 has a second long side 341 and a second short side 342. The second long side 341 extends along the width direction of the optical fiber array 31, and the second short side 342 is perpendicularly arranged with the second long side 341. There are two transverse grooves 33a and two longitudinal grooves 33b. The two transverse grooves 33a are respectively arranged outside the second coupling portion 34 corresponding to the second long side 341, and the two longitudinal grooves 33b are respectively arranged outside the second coupling portion 34 corresponding to the second short side 342.

[0051] As a further preferred solution, the transverse ribs 24a and the longitudinal ribs 24b are arranged at intervals to avoid possible interference with the positioning fit caused by the intersection between the transverse ribs 24a and the longitudinal ribs 24b. The transverse grooves 33a and the longitudinal grooves 33b are cross-connected. The cross-sectional profiles of the transverse ribs 24a and the longitudinal ribs 24b are both arc-shaped, and the cross-sectional profiles of the transverse grooves 33a and the longitudinal grooves 33b are both V-shaped. Through the cooperative design of the arc-shaped ribs and the V-shaped grooves, the precise positioning function in the two-dimensional plane is achieved.

[0052] On the basis of the above embodiments, preferably, when the first alignment structure 24 and the second alignment structure 33 are in positioning fit, there may be a small gap between the upper surface of the positioning seat 22 and the lower surface of the fixed structure 32, that is, the positioning seat 22 and the fixed structure 32 do not have surface-to-surface contact, but only through the cooperation relationship between the transverse rib 24a and the transverse groove 33a, and the longitudinal rib 24b and the longitudinal groove 33b, the positioning purpose of the fixed structure 32 in the two-dimensional plane is achieved. Specifically, the heights of the transverse rib 24a and the longitudinal rib 24b are equal, the value range of the rib height is 100 μm to 1000 μm, the depths of the transverse groove 33a and the longitudinal groove 33b are equal, and the difference between the groove depth and the rib height does not exceed ±500 μm. The value range of the above small gap is 20 μm to 500 μm.

[0053] In order to meet different usage requirements, in other embodiments, the first alignment structure is a groove structure, and correspondingly, the second alignment structure is a protrusion structure. By interchanging the concave-convex design of the first alignment structure and the second alignment structure, the high-precision positioning purpose of the first coupling portion and the second coupling portion in the radial plane of the optical through-hole can also be achieved.

[0054] In this embodiment, the pressing member 5 is hinged to the upper cover body 4. An elastic pressing piece 51 is provided in the middle of the pressing member 5. The elastic pressing piece 51 protrudes toward the side close to the substrate 1, and the elastic pressing piece 51 and the pressing member 5 are of an integral structure. The elastic pressing piece 51 is a metal pressing piece. In the locked state, the elastic pressing piece 51 can generate a stable elastic pressure on the fixed structure 32, thereby ensuring the coupling accuracy and reliability between the silicon optical chip 2 and the fiber array 31.

[0055] As a further preferred solution, a pressing portion 52 is further provided on the side of the pressing member 5 away from the hinge axis. Hook-shaped protrusions 53 are provided on both sides of the pressing portion 52 in the width direction of the optical fiber array 31. The upper cover 4 is provided with a card slot 41. The pressing portion 52 is accommodated and fitted with the card slot 41. A convex edge 42 is provided on the inner side of the card slot 41. The hook-shaped protrusion 53 is in blocking cooperation with the convex edge 42. Press down on the pressing portion 52 until the pressing portion 52 is snapped into the card slot 41. The blocking cooperation between the hook-shaped protrusion 53 and the convex edge 42 ensures the reliability of the snap connection. When disassembly is required, forcefully pry open the pressing portion 52 to disengage the hook-shaped protrusion 53 from the convex edge 42 to complete the unlocking operation.

[0056] As Figure 3 , Figure 6 shown, the optical through hole 23 includes a first hole section 233 and a second hole section 234 arranged in sequence along the hole axis direction. The second hole section 234 is located on the side of the first hole section 233 away from the silicon optical chip 2. The cross-sectional width of the first hole section 233 is smaller than the cross-sectional width away from the second hole section 234. The second coupling portion 34 is accommodated and fitted with the second hole section 234. Through the positioning relationship between the first alignment structure 24 and the second alignment structure 33, and the cooperation of the accommodation and fitting between the second coupling portion 34 and the second hole section 234, the positioning function of the double fitting structure is achieved, effectively improving the position accuracy of the second coupling portion 34. In this embodiment, the first coupling portion 21 is a microlens embedded in the silicon optical chip 2. The microlens forms optical conduction with the waveguide, mainly used for focusing optical signals and adjusting the direction of optical signals to ensure the transmission quality of optical signals. Correspondingly, the second coupling portion 34 is a lens, also used for focusing optical signals and adjusting the direction of optical signals.

[0057] It should be noted that the fixing structure 32 includes a right-angled block 321 and a pressing plate 322. The right-angled block 321 includes a vertical section 321a and a horizontal section 321b fixedly connected. A wiring groove 321c is provided in the middle of the horizontal section 321b. The pressing plate 322 is arranged parallel and spaced from the vertical section 321a. The optical fiber array 31 is arranged in the wiring groove 321c and the space between the pressing plate 322 and the vertical section 321a. The optical fiber array 31 is adhesively connected to the right-angled block 321 and the pressing plate 322 respectively, achieving the purpose of smooth change in the routing direction of the optical fiber array 31. In addition, the optical engine packaging structure further includes an electrical chip 6 and an ASIC chip 7. The electrical chip 6 and the ASIC chip 7 are respectively flip-chip mounted on the upper side of the substrate 1. The electrical chip 6 and the ASIC chip 7 are arranged at intervals. The silicon optical chip 2 is flip-chip mounted on the upper side of the electrical chip 6. The substrate 1 is electrically connected to the electrical chip 6 and the ASIC chip 7 respectively, thus ensuring the functions of optical / electrical signal processing and data calculation.

[0058] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. An optical engine packaging structure based on grating coupling, characterized in that, It includes a substrate, a silicon photonic chip, an optical fiber array unit, and an upper cover. The silicon photonic chip is disposed on the upper side of the substrate, and the substrate is electrically connected to the silicon photonic chip; On the upper side of the silicon photonic chip, there are a first coupling portion and a positioning seat. The positioning seat is provided with an optical through hole penetrating up and down, and the optical through hole corresponds to the first coupling portion; The optical fiber array unit includes an optical fiber array and a fixing structure. The fixing structure is fixedly connected to the optical fiber array. On the lower side of the fixing structure, there is a second coupling portion, and the second coupling portion is optically communicated with the optical fiber array; The upper cover is mounted on the upper side of the substrate. The upper cover is provided with a jack corresponding to the positioning seat, and the fixing structure is detachably mounted in the jack; The upper cover is also movably provided with a pressing member. The pressing member has a locked state and an unlocked state. In the locked state, the pressing member and the fixing structure are in pressing fit along the axial direction of the optical through hole; On the upper side of the positioning seat, there is a first alignment structure, and on the lower side of the fixing structure, there is a second alignment structure; the second alignment structure and the first alignment structure are in positioning fit in the radial plane of the optical through hole, and the second coupling portion and the first coupling portion are vertically aligned.

2. The optical engine packaging structure based on grating coupling according to claim 1, wherein The first alignment structure is a convex structure, and the second alignment structure is a groove structure; or, the first alignment structure is a groove structure, and the second alignment structure is a convex structure.

3. The optical engine packaging structure based on grating coupling according to claim 2, characterized in that, The first alignment structure includes a transverse rib and a longitudinal rib. The transverse rib extends along the width direction of the optical fiber array, and the longitudinal rib is vertically arranged with the transverse rib in the radial plane of the optical through hole; The second alignment structure includes a transverse groove and a longitudinal groove. The transverse groove extends along the width direction of the optical fiber array, and the longitudinal groove is vertically arranged with the transverse groove in the radial plane of the optical through hole; The transverse rib and the transverse groove are in concave-convex fit, and the longitudinal rib and the longitudinal groove are in concave-convex fit.

4. The optical engine packaging structure based on grating coupling according to claim 3, characterized in that The optical through hole has a first long side and a first short side. The first long side extends along the width direction of the optical fiber array, and the first short side is vertically arranged with the first long side; there are two transverse ribs and two longitudinal ribs. The two transverse ribs are respectively disposed outside the optical through hole corresponding to the first long side, and the two longitudinal ribs are respectively disposed outside the optical through hole corresponding to the first short side; The second coupling portion has a second long side and a second short side. The second long side extends along the width direction of the optical fiber array, and the second short side is vertically arranged with the second long side; there are two transverse grooves and two longitudinal grooves. The two transverse grooves are respectively disposed outside the second coupling portion corresponding to the second long side, and the two longitudinal grooves are respectively disposed outside the second coupling portion corresponding to the second short side.

5. The optical engine package structure based on grating coupling according to claim 3 or 4, characterized in that, The transverse ribs and the longitudinal ribs are arranged at intervals, and the transverse grooves and the longitudinal grooves are cross-connected.

6. The optical engine packaging structure based on grating coupling according to claim 3 or 4, characterized in that The cross-sectional profiles of the transverse ribs and the longitudinal ribs are both arc-shaped, and the cross-sectional profiles of the transverse grooves and the longitudinal grooves are both V-shaped.

7. The optical engine packaging structure based on grating coupling according to claim 1, characterized in that The pressing member is hinged to the upper cover body. An elastic pressing piece is arranged in the middle of the pressing member. The elastic pressing piece protrudes toward the side close to the substrate, and the elastic pressing piece and the pressing member are of an integral structure.

8. The optical engine package structure based on grating coupling according to claim 7, characterized in that A pressing part is further arranged on one side of the pressing member away from the hinge axis. Hooks are arranged on both sides of the pressing part in the width direction of the optical fiber array. A clamping groove is formed in the upper cover body. The pressing part is accommodated and matched with the clamping groove. A convex edge is arranged on the inner side of the clamping groove. The hooks are in blocking cooperation with the convex edge.

9. The optical engine package structure based on grating coupling according to any one of claims 1 to 4, characterized in that, The optical through hole includes a first hole section and a second hole section arranged in sequence along the hole axis direction. The second hole section is located on the side of the first hole section away from the silicon optical chip. The cross-sectional width of the first hole section is smaller than the cross-sectional width away from the second hole section. The second coupling part is accommodated and matched with the second hole section.

10. The optical engine packaging structure based on grating coupling according to any one of claims 1 to 4, characterized in that, The fixing structure includes a right-angle block and a pressing plate. The right-angle block includes a vertical section and a horizontal section fixedly connected. A wiring groove is formed in the middle of the horizontal section. The pressing plate is arranged parallel and spaced from the vertical section. The optical fiber array is arranged in the wiring groove and the space between the pressing plate and the vertical section. The optical fiber array is adhesively connected to the right-angle block and the pressing plate respectively.

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