Optical unit, test system, and method for producing optical unit

Abstract

To provide an optical unit (10; 110) for transmitting a synthetically generated optical signal (S) for a test system (1; 101) of a LiDAR sensor (12; 112), and to provide the test system, and a method for producing the optical unit.SOLUTION: An optical unit comprises a support device (14; 114) for receiving at least one optical waveguide (16; 116), where the support device has at least one opening (20; 120) which is formed perpendicular to an end face (14a; 114a) of the support device. At least one optical waveguide is inserted into the opening, and the optical unit includes at least one microlens (18; 118) connected to an end face of the support device, and opposed end faces (14a;114a and 18a;118a) of the support device and the at least one microlens are formed in a plane shape, respectively.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an optical unit for transmitting a synthetically generated optical signal for a test system of a LiDAR sensor.

[0002] The present invention further relates to a test system for a LiDAR sensor.

[0003] The present invention further relates to a method for manufacturing an optical unit for transmitting a synthetically generated optical signal for a test system of a LiDAR sensor.

Background Art

[0004] LiDAR optical measurement systems are used to optically measure distance and speed, in addition to further applications. A LiDAR optical measurement system emits light and measures the time required for the light to return to the LiDAR optical measurement system after being reflected by an object. From the known speed of light, the distance from the LiDAR optical measurement system to the object is calculated.

[0005] Examples of application fields of LiDAR optical measurement systems are LiDAR optical measurement systems for mobile devices for optical distance measurement and for automotive application fields, i.e., for driver assistance systems and autonomous driving, as well as for aerospace applications.

[0006] German Patent Application Publication No. 10200 *7057372 discloses a test system for a LiDAR sensor having a trigger unit. According to the test system, in response to receiving a signal of the LiDAR sensor to be tested, the signal generator is controlled such that a predetermined synthetically generated or recorded optical signal is output by the signal generation unit of the signal generator.

[0007] German Patent Application Publication No. 102017110790 discloses a simulation apparatus for a LiDAR optical measurement system having a LiDAR optical receiving sensor, wherein an optical transmitter is provided in the plane of the LiDAR optical receiving sensor, and a further optical transmitter is provided adjacent to the optical transmitter in the plane of the LiDAR optical receiving sensor, and a computer monitors the operation of the LiDAR optical receiving sensor and the period for emitting optical signals through the optical transmitters and / or further optical transmitters, and records the signal input of optical signals from the optical transmitters or further optical transmitters. [Overview of the project] [Problems that the invention aims to solve]

[0008] The problem with testing a LiDAR sensor using a signal generator is that all the light sources or pixels of the signal generator or LiDAR OTA system must be superimposed onto a single point. Ideally, this point corresponds to the aperture diaphragm of the LiDAR sensor being tested.

[0009] The challenge lies in transmitting this initial beam guidance to the signal generator from an economic standpoint.

[0010] Therefore, the object of the present invention is to provide an optical unit for transmitting synthetically generated optical signals for a LiDAR sensor test system, which enables the desired beam guidance within an optimized cost-benefit ratio. [Means for solving the problem]

[0011] The above problems are solved, according to the present invention, by an optical unit for transmitting synthetically generated optical signals for a LiDAR sensor test system, having the features described in claim 1.

[0012] The above problems are further solved by an alternative optical unit for transmitting synthetically generated optical signals for a LiDAR sensor test system, having the features described in claim 4, according to the present invention.

[0013] The above problems are further solved by a test system for a LiDAR sensor having the features described in claim 10, according to the present invention.

[0014] The above problems are further solved by a method for manufacturing an optical unit for transmitting synthetically generated optical signals for a LiDAR sensor test system, having the features described in claim 15.

[0015] The present invention relates to an optical unit for transmitting synthetically generated optical signals for a LiDAR sensor test system.

[0016] The optical unit includes a support device for housing at least one optical waveguide, the support device having at least one opening formed perpendicular to the end face of the support device, and the at least one optical waveguide is inserted into this opening.

[0017] The optical unit further includes at least one microlens connected to the end face of a support device, the mutually opposing end faces of the support device and the at least one microlens being formed planar, and the at least one microlens being associated with at least one optical waveguide inserted into at least one aperture of the support device.

[0018] A compositely generated optical signal, particularly a laser pulse or light-emitting diode signal, transmitted by at least one optical waveguide, is directed to a LiDAR sensor through an associated microlens. The at least one optical waveguide is positioned within the support device offset from the optical axis of the microlens associated with the optical waveguide.

[0019] The present invention further relates to an alternative optical unit for transmitting synthetically generated optical signals for a LiDAR sensor test system.

[0020] The optical unit includes a support device for housing at least one optical waveguide, the support device having at least one opening formed perpendicular to the end face of the support device, into which at least one optical waveguide is inserted.

[0021] The optical unit further includes at least one microlens connected to the end face of a support device, the mutually opposing end faces of the support device and the at least one microlens being formed in a planar manner, and the at least one microlens being associated with at least one optical waveguide inserted into at least one aperture of the support device.

[0022] At least one optical waveguide is positioned on the optical axis of at least one microlens associated with the optical waveguide.

[0023] At least one microlens is further configured to collimate a compositely generated optical signal, particularly a laser pulse or light-emitting diode signal, transmitted by at least one optical waveguide, to a further lens positioned adjacent to the microlens. In addition, the compositely generated optical signal is directed through the further lens to a LiDAR sensor.

[0024] The present invention further relates to a test system for a LiDAR sensor. The test system includes a LiDAR sensor and a plurality of optical units according to the present invention, which are positioned in a fixed or movable manner relative to the LiDAR sensor, wherein the synthetically generated optical signals transmitted by the optical units are directed to the LiDAR sensor, and the plurality of optical units are positioned within the detection range of the LiDAR sensor.

[0025] The present invention further relates to a method for manufacturing an optical unit for transmitting synthetically generated optical signals for a test system of a LiDAR sensor.

[0026] The method includes preparing a support device for accommodating at least one optical waveguide, and drilling at least one opening in the support device that is formed perpendicular to the end face of the support device.

[0027] The method further includes inserting at least one optical waveguide into at least one opening and fixing at least one optical waveguide in at least one opening by a sleeve, and grinding the end face of at least one optical waveguide facing the lens in a planar shape.

[0028] In addition, the method includes polishing the fiber end of at least one optical waveguide and joining and adhering the support device to at least one microlens.

[0029] The idea of the present invention is to provide at least one microlens connected to the end face of the support device and at least one arrangement of optical waveguides in the support device offset with respect to the optical axis of the microlens associated with the optical waveguide, thereby enabling miniaturization of the optical front end of a LiDAR OTA (over the air) test system.

[0030] The optical unit according to the present invention further enables improvement of pixel density and angular resolution without the need to increase the distance to the LiDAR test sensor.

[0031] Thereby, it is further possible to improve the feasibility of a scalable and monolithic front-end module for flexibly adapting the OTA test system to customer requirements. In this case, the OTA test system can be realized in a stationary manner or as a mechanically movable front-end module or optical unit.

[0032] Based on the modular structure of the OTA test system, which includes multiple optical units, the use of microlens arrays can be implemented economically.

[0033] Further embodiments of the present invention are subject to further dependent claims and the following description with reference to the drawings.

[0034] According to a preferred evolution of the present invention, at least one optical waveguide inserted into at least one opening of the support device is positioned offset in a direction parallel to, and in particular orthogonal to, the optical axis of at least one microlens.

[0035] The offset placement of the optical waveguides is advantageous because it allows the optical signal to be deflected by at least one microlens in the optical unit, enabling precise direction of the optical signal to the LiDAR sensor.

[0036] According to a further preferred development of the present invention, the dimensions of at least one microlens are formed such that the length of the signal path of the compositely generated optical signal within at least one microlens corresponds to the focal length of the microlens. This causes the optical signal to be deflected in a correspondingly desired direction after it exits the microlens.

[0037] According to a further preferred development of the present invention, the additional lenses are arranged along the optical axis of at least one microlens at a predetermined interval, and the additional lenses are convex on the output side of the compositely generated optical signal. This advantageously allows the optical signal to be deflected towards the LiDAR sensor.

[0038] According to a further preferred development of the present invention, at least one microlens is integrally formed from, in particular, plastic or glass, and at least one microlens is convex on the output side of the synthetically generated optical signal. This advantageously allows the optical signal to be deflected toward the LiDAR sensor.

[0039] According to a further preferred development of the present invention, at least one optical waveguide is fixed by a sleeve, in particular by a ferrule, within at least one opening formed in a support device, the sleeve being crimped or bonded to each optical waveguide and / or each opening.

[0040] This allows for precise positioning of the optical waveguide within the aperture. As a result, the position of the optical waveguide within the aperture will not change even after the adhesive has cured.

[0041] According to a further preferred development of the present invention, at least one optical waveguide, particularly a planar axial end region, is positioned to abut the end face of at least one microlens facing the support device, particularly the end face of at least one microlens. This makes it possible to efficiently transmit optical signals from the optical waveguide to the microlens without causing loss of scattered light.

[0042] According to a further preferred development of the present invention, the optical unit is formed substantially in a strip shape, and the optical unit is equipped with multiple rows of microlenses oriented longitudinally and transversely. Thus, by providing multiple optical waveguides, it is advantageous to achieve an improvement in the pixel resolution of the optical unit.

[0043] According to a further preferred development of the present invention, the optical units are arranged adjacent to each other in a substantially semicircular shape with respect to the LiDAR sensor. Thus, this test system makes it possible to simulate real-world traffic conditions having the same detection range as the LiDAR sensor.

[0044] According to a further preferred development of the present invention, the optical unit is configured to refract, in particular, the synthetically generated optical signal supplied by the optical waveguide, deflecting it by up to 20° with respect to the orientation of the optical waveguide. This advantageously corresponds to a 20° aperture angle of the LiDAR sensor.

[0045] According to a further preferred development of the present invention, the mounting of microlenses to the optical unit can be changed depending on the position of each optical unit relative to the LiDAR sensor. This makes it possible to optimally position the lenses for various different traffic conditions.

[0046] According to a further preferred development of the present invention, the optical unit located in the central region of a substantially semicircular array of optical units centered on the LiDAR sensor has more microlenses than the optical units located in the edge regions of the semicircular array. This makes it possible to achieve a more precise resolution, for example, when driving on a highway, compared to when driving in urban areas.

[0047] The features of the method for determining the computational cost of a virtual test of a device for at least partially autonomous steering of an automobile described herein are also applicable to the test unit according to the present invention for determining the computational cost of a virtual test of a device for at least partially autonomous steering of an automobile, and vice versa.

[0048] For a better understanding of the present invention and its advantages, the following description is to be referenced in relation to the accompanying drawings.

[0049] The present invention will be described in more detail below based on exemplary embodiments shown in the schematic diagrams of the drawings. [Brief explanation of the drawing]

[0050] [Figure 1] This is a schematic diagram of an optical unit for transmitting synthetically generated optical signals for a LiDAR sensor test system, according to a first embodiment of the present invention. [Figure 2] This is a schematic diagram of an optical unit for transmitting synthetically generated optical signals for a LiDAR sensor test system, according to a second embodiment of the present invention. [Figure 3] This is a schematic diagram of a LiDAR sensor test system according to an embodiment of the present invention. [Figure 4] This is a plan view of a LiDAR sensor test system according to an embodiment of the present invention. [Figure 5] This figure shows a method for manufacturing an optical unit for transmitting synthetically generated optical signals for a LiDAR sensor test system, according to an embodiment of the present invention. [Modes for carrying out the invention]

[0051] Unless otherwise indicated, the same reference numeral refers to the same element in each figure.

[0052] The optical unit 10 for transmitting a synthetically generated optical signal S for the LiDAR sensor 12 test system 1, shown in Figure 1, includes a support device 14 for housing at least one optical waveguide 16.

[0053] The support device 14 has at least one opening 20 formed perpendicular to the end face 14a of the support device 14, and at least one optical waveguide 16 is inserted into this opening 20.

[0054] The optical unit 10 further includes at least one microlens 18 connected to the end face 14a of the support device 14.

[0055] The number of microlenses 18 per optical unit 10 can be freely selected or configured. For example, in this case, one microlens 18 can be associated with each optical waveguide 16.

[0056] In this embodiment, the support device 14 has a plurality of openings 20, and one optical waveguide 16 is inserted into each of these openings. A microlens 18 is associated with each optical waveguide 16 itself.

[0057] The mutually opposing end faces 14a and 18a of the support device 14 and at least one microlens 18 are each formed in a planar shape. At least one optical waveguide 16 inserted into at least one opening 20 of the support device 14 is associated with at least one microlens 18.

[0058] A compositely generated optical signal S, particularly a laser pulse or light-emitting diode signal, transmitted by at least one optical waveguide 16, is directed to the LiDAR sensor 12 through the associated microlens 18.

[0059] At least one optical waveguide 16 is further positioned within the support device 14, offset with respect to the optical axis 18b of a microlens 18 associated with this optical waveguide 16. Furthermore, at least one optical waveguide 16 inserted into at least one aperture 20 of the support device 14 is positioned offset in a direction parallel to, and in particular orthogonal to, the optical axis 18b of at least one microlens 18.

[0060] In addition, the dimensions of at least one microlens 18 are formed such that the length of the signal path of the compositely generated optical signal S within at least one microlens 18 corresponds to the focal length of the microlens 18.

[0061] At least one microlens 18 is integrally formed from, in particular, plastic or glass. At least one microlens 18 is further formed convexly on the output side of the compositely generated optical signal S.

[0062] At least one optical waveguide 16 is fixed by a sleeve 15, in particular by a ferrule, within at least one opening 20 formed within the support device 14. The sleeve 15 is crimped or bonded to each optical waveguide 16 and / or each opening 20.

[0063] At least one optical waveguide 16, particularly the axially formed planar end portion, is further positioned to contact the end face of at least one microlens 18 facing the support device 14, particularly the end face of at least one microlens 18.

[0064] The optical unit 10 is formed in a substantially strip shape. Furthermore, the optical unit 10 is equipped with multiple rows of microlenses 18 oriented in the longitudinal and transverse directions.

[0065] Figure 2 shows a schematic diagram of an optical unit 110 for transmitting a synthetically generated optical signal S for a test system 101 of a LiDAR sensor 112, according to a second embodiment of the present invention.

[0066] The optical unit 110 includes a support device 114 for housing at least one optical waveguide 116, the support device 114 having at least one opening 120 formed perpendicular to the end face 114a of the support device 114, into which at least one optical waveguide 116 is inserted.

[0067] The optical unit 110 further includes at least one microlens 118 connected to the end face 114a of the support device 114. The mutually opposing end faces 114a and 118a of the support device 114 and the at least one microlens 118 are each formed in a planar shape. At least one optical waveguide 116 inserted into at least one aperture 120 of the support device 114 is associated with at least one microlens 118.

[0068] At least one optical waveguide 116 is further positioned on the optical axis 118b of at least one microlens 118 associated with the optical waveguide 116. In addition, at least one microlens 118 is configured to collimate a compositely generated optical signal S, in particular a laser pulse or light-emitting diode signal, transmitted by at least one optical waveguide 116, with a further lens 119 positioned adjacent to the at least one microlens 118.

[0069] The synthetically generated optical signal S is further directed towards the LiDAR sensor 112 through an additional lens 119. In addition, the additional lens 119 is positioned along the optical axis 118b of at least one microlens 118 at a predetermined distance from the microlens 118. The additional lens 119 is formed convexly on the output side of the synthetically generated optical signal S.

[0070] The number of microlenses 118 per optical unit 110 can be freely selected or configured. For example, in this case, one microlens 118 can be associated with each optical waveguide 116.

[0071] In this embodiment, the support device 114 has a plurality of openings 120, and one optical waveguide 116 is inserted into each of these openings. A microlens 118 is associated with each optical waveguide 116 itself.

[0072] At least one microlens 118 is integrally formed from, in particular, plastic or glass. At least one microlens 118 is further formed convexly on the output side of the compositely generated optical signal S.

[0073] At least one optical waveguide 116 is fixed by a sleeve 115, in particular by a ferrule, within at least one opening 120 formed within the support device 114. The sleeve 115 is crimped or bonded to each optical waveguide 116 and / or each opening 120.

[0074] At least one optical waveguide 116, particularly the axially formed, planar end region, is positioned to contact the end face of at least one microlens 118 facing the support device 114, particularly the end face of at least one microlens 118. The optical unit is further formed substantially in a strip shape, and the optical unit is mounted with multiple rows of microlenses 118 oriented longitudinally and transversely.

[0075] Figure 3 shows a schematic diagram of a test system 1;101 of a LiDAR sensor 12;112 according to an embodiment of the present invention.

[0076] A test system 1;101 for a LiDAR sensor 12;112 includes, among other things, a plurality of optical units 10;110 according to the present invention, which are fixed or movable relative to the LiDAR sensor 12;112, and the LiDAR sensor 12;112, wherein a synthetically generated optical signal S transmitted by the optical units 10;110 is directed toward the LiDAR sensor 12;112. The plurality of optical units are further positioned within the detection range of the LiDAR sensor 12;112.

[0077] Multiple optical units 10;110 are arranged adjacent to each other in a substantially semicircular shape with the LiDAR sensor 12;112 at its center. In this case, these optical units are configured to refract, in particular, the compositely generated optical signal S supplied by the optical waveguide 16;116, deflecting it by up to 20° with respect to the orientation of the optical waveguide 16;116.

[0078] Figure 4 shows a plan view of a test system 1;101 of a LiDAR sensor 12;112 according to an embodiment of the present invention.

[0079] The placement of the microlenses 18;118 on the optical units 10;110 can be modified depending on the position of each optical unit 10;110 relative to the LiDAR sensors 12;112.

[0080] Optical units 10;110 located in the central region of a substantially semicircular array of optical units 10;110 centered on LiDAR sensors 12;112 preferably have more microlenses 18;118 than optical units 10;110 located in the edge regions of the semicircular array. Alternatively, this array may be implemented according to other structural and / or systemic criteria.

[0081] Figure 5 shows a method for fabricating an optical unit for transmitting a synthetically generated optical signal S for a test system 1 of LiDAR sensors 12;112, according to an embodiment of the present invention.

[0082] The method includes S1 preparing a support device 14;114 for housing at least one optical waveguide 16;116, and S2 drilling at least one opening 20;120 in the support device 14;114 that is perpendicular to the end faces 14a;114a of the support device 14;114.

[0083] The method further includes inserting at least one optical waveguide 16;116 into at least one aperture 20;120 and fixing the at least one optical waveguide 16;116 within the at least one aperture 20;120 by sleeve 15;115 S3, and grinding the end face of the at least one optical waveguide 16;116 facing the lens into a planar shape S4.

[0084] The method further includes polishing the fiber end of at least one optical waveguide 16;116 S5 and joining and bonding the support device 14;114 with at least one microlens 18;118 S6. [Explanation of symbols]

[0085] 1;101 Test System 10;110 Optical Unit 12;112 LiDAR sensor 14;114 Support device 14a;114a End face 15;115 Sleeve 16;116 Optical waveguide 18;118 Microlens 18a;118a End face 18b;118b Optical axis 119 Further lenses 20;120 opening S optical signal S1-S6 Method Steps

Claims

1. An optical unit (10) for transmitting a synthetically generated optical signal (S) for a testing system (1) of a LiDAR sensor (12), comprising: The optical unit (10) comprises a support device (14) for accommodating at least one optical waveguide (16), The support device (14) has at least one opening (20) formed perpendicular to an end face (14a) of the support device (14), and the at least one optical waveguide (16) is inserted into the opening (20); The optical unit (10) comprises at least one microlens (18) connected to the end surface (14a) of the support device (14); The end faces (14a, 18a) of the support device (14) and the at least one microlens (18) facing each other are formed flat, the at least one microlens (18) is associated with at least one optical waveguide (16) inserted into the at least one opening (20) of the support device (14); the synthetically generated optical signal (S), in particular a laser pulse or a light emitting diode signal, transmitted by the at least one optical waveguide (16) is directed through the associated microlens (18) to the LiDAR sensor (12); the at least one optical waveguide (16) is arranged in the support device (14) offset with respect to the optical axis (18b) of the microlens (18) associated with the optical waveguide (16); Optical unit (10).

2. the at least one optical waveguide (16) inserted into the at least one opening (20) of the support device (14) is arranged parallel to the optical axis (18b) of the at least one microlens (18), in particular offset perpendicularly to the optical axis (18b). The optical unit according to claim 1 .

3. The dimensions of the at least one microlens (18) are formed such that a signal path length of the synthetically generated optical signal (S) within the at least one microlens (18) corresponds to a focal length of the microlens (18).

3. The optical unit according to claim 1.

4. An optical unit (110) for transmitting a synthetically generated optical signal (S) for a testing system (101) of a LiDAR sensor (112), comprising: The optical unit (110) comprises a support device (114) for accommodating at least one optical waveguide (116), The support device (114) has at least one opening (120) formed perpendicular to an end face (114a) of the support device (114), and the at least one optical waveguide (116) is inserted into the opening (120); the optical unit (110) comprises at least one microlens (118) connected to the end face (114a) of the support device (114); The end faces (114a, 118a) of the support device (114) and the at least one microlens (118) facing each other are each formed flat, the at least one optical waveguide (116) inserted into the at least one opening (120) of the support device (114) is associated with the at least one microlens (118); the at least one optical waveguide (116) is disposed on an optical axis (118b) of the at least one microlens (118) associated with the optical waveguide (116); the at least one microlens (118) is configured to collimate the synthetically generated optical signal (S), in particular a laser pulse or a light emitting diode signal, transmitted by the at least one optical waveguide (116) onto a further lens (119) arranged adjacent to the at least one microlens (118); The synthetically generated optical signal (S) is directed through the further lens (119) to the LiDAR sensor (112). Optical unit (110).

5. the further lens (119) is arranged along the optical axis (118b) of the at least one microlens (118) at a predetermined distance from the at least one microlens (118); the further lens (119) is formed convexly at the output side of the synthetically generated optical signal (S), 5. The optical unit according to claim 4.

6. said at least one microlens (18; 118) being integrally formed, in particular from plastic or glass; the at least one microlens (18; 118) is formed convexly on the output side of the synthetically generated optical signal (S), 5. The optical unit according to claim 1.

7. the at least one optical waveguide (16; 116) is fixed in at least one opening (20; 120) formed in the carrier device (14; 114) by a sleeve (15; 115), in particular by a ferrule, the sleeve (15; 115) is crimped or glued to the respective optical waveguide (16; 116) and / or the respective opening (20; 120); 5. The optical unit according to claim 1.

8. an axial end section of the at least one light guide (16; 116), which is particularly formed in a planar shape, is arranged to abut against an end face of the at least one microlens (18; 118) facing the carrier device (14; 114), in particular against an end face of the at least one microlens (18; 118).

5. The optical unit according to claim 1.

9. the optical unit (10; 110) is substantially strip-shaped, The optical unit (10; 110) is equipped with a plurality of rows of longitudinally and laterally oriented microlenses (18; 118), 5. The optical unit according to claim 1.

10. A test system (1; 101) for a LiDAR sensor (12; 112), said test system (1; 101) comprising: a plurality of optical units (10; 110) according to claim 1 or 4, arranged in particular stationary or movable relative to the LiDAR sensor (12; 112); A LiDAR sensor (12; 112); Equipped with the synthetically generated optical signal (S) transmitted by the optical unit (10; 110) is directed to the LiDAR sensor (12; 112), The plurality of optical units (10; 110) are arranged within a detection range of the LiDAR sensor (12; 112). Test System (1;101).

11. The plurality of optical units (10; 110) are arranged adjacent to each other in a substantially semicircular shape centered on the LiDAR sensor (12; 112). The test system of claim 10.

12. the optical unit (10; 110) is configured to deflect, in particular, the synthetically generated optical signal (S) provided by the optical waveguide (16; 116) by a maximum of 20° relative to the orientation of the optical waveguide (16; 116), The test system of claim 10.

13. The mounting of the microlenses (18; 118) on the optical units (10; 110) can be changed depending on the position of the respective optical units (10; 110) relative to the LiDAR sensor (12; 112). The test system of claim 10.

14. The optical units (10; 110) arranged in a central area of ​​the substantially semicircular array of the optical units (10; 110) centered on the LiDAR sensor (12; 112) have a larger number of microlenses (18; 118) than the optical units (10; 110) arranged in the edge areas of the semicircular array.

14. The test system of claim 13.

15. 1. A method for manufacturing an optical unit (10; 110) for transmitting a synthetically generated optical signal (S) for a testing system (1; 101) of a LiDAR sensor (12; 112), said method comprising: - providing (S1) a support device (14; 114) for accommodating at least one optical waveguide (16; 116); a step (S2) of drilling at least one opening (20; 120) in the support device (14; 114) that is formed perpendicular to the end face (14a; 114a) of the support device (14; 114); a step (S3) of inserting said at least one optical waveguide (16; 116) into said at least one opening (20; 120) and fixing said at least one optical waveguide (16; 116) in said at least one opening (20; 120) by means of a sleeve (15; 115); a step (S4) of grinding the end face of said at least one optical waveguide (16; 116) facing the lens to a flat surface; a step (S5) of polishing the fiber end of said at least one optical waveguide (16; 116); a step (S6) of bonding and adhering said support device (14; 114) to said at least one microlens (18; 118); A method comprising:

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