Calibration method and device of optical transceiver module and storage medium

Abstract

The invention discloses a calibration method and device of an optical transceiver module and a storage medium, and belongs to the technical field of radars. According to the technical scheme provided by the embodiment of the invention, the first light beam and the second light beam which are parallel to each other are used for performing active light modulation on the reflector in the light receiving and transmitting module, and the accuracy of reflector attitude adjustment is improved by utilizing multiple information provided by the light spots of the first light beam and the second light beam in the collimator; therefore, the precision of detecting by using the optical transceiver module subsequently is improved.

Description

Technical Field

[0001] This application relates to the field of radar technology, and in particular to a calibration method, apparatus and storage medium for an optical transceiver module. Background Technology

[0002] With the increasing demand for miniaturization and lightweight design of smart sensors, folded optical path systems are widely used as an important way to reduce product size. Mirrors play a crucial role in folded optical path systems, therefore, the positioning of mirrors is very important. Summary of the Invention

[0003] In related technologies, the positioning accuracy of reflectors is relatively low. This application provides a calibration method, apparatus, and storage medium for an optical transceiver module, which can improve the positioning accuracy of reflectors in a receiving optical module. The technical solution is as follows:

[0004] On the one hand, a calibration method for an optical transceiver module is provided, wherein the optical transceiver module includes a receiving optical system, and the receiving optical system includes a first lens, a reflector and a second lens arranged sequentially along the receiving optical path;

[0005] The calibration method is applied to a light adjustment device, which includes a light source module and a first collimator. The light source module provides a first beam and a second beam that are parallel to each other. The first collimator receives the first beam and the second beam emitted through a second lens. The calibration method includes:

[0006] The optical transceiver module is installed in the first preset position;

[0007] The light source module is installed on the light-incident side of the receiving optical system so that the first beam and the second beam are symmetrical about the first optical axis in the upstream optical path of the receiving optical system, wherein the first optical axis is the optical axis of the first lens;

[0008] The first collimator is mounted on the light-emitting side of the receiving optical system, such that the first collimator is configured so that a light beam emitted via the second optical axis can be incident on the first collimator along the third optical axis, wherein the second optical axis is the optical axis of the second lens, and the third optical axis is the optical axis of the first collimator; and

[0009] The reflector is adjusted so that the center of symmetry of the light spots of the first beam and the second beam within the first collimator is located within a preset distance range from the center of the imaging element of the collimator.

[0010] On one hand, a calibration device for an optical transceiver module is provided. The optical transceiver module includes a receiving optical system, which includes a first lens, a reflector, and a second lens arranged sequentially along the receiving optical path. The calibration device is a type of optical adjustment device, which includes a light source module and a first collimator. The light source module is used to provide a first beam and a second beam that are parallel to each other. The first collimator is used to receive the first beam and the second beam emitted through the second lens. The calibration device includes:

[0011] The first installation module is used to install the optical transceiver module at a first preset position;

[0012] The second mounting module is used to mount the light source module on the light-incident side of the receiving optical system, so that the first beam and the second beam are symmetrical about the first optical axis in the upstream optical path of the receiving optical system, wherein the first optical axis is the optical axis of the first lens;

[0013] A third mounting module is used to mount the first collimator to the light-emitting side of the receiving optical system, such that the first collimator is configured so that a light beam emitted via the second optical axis can be incident on the first collimator along the third optical axis, wherein the second optical axis is the optical axis of the second lens, and the third optical axis is the optical axis of the first collimator; and

[0014] An adjustment module is used to adjust the reflector so that the center of symmetry of the light spots of the first beam and the second beam within the first collimator is located within a preset distance range from the center of the imaging element of the collimator.

[0015] In one possible implementation, the optical transceiver module includes a transmitting optical system, a beam splitter, and a receiving optical system. The beam splitter has a first side, a transmitting / receiving side, and a second side. The beam splitter is configured such that a light beam incident from the first side exits via the transmitting / receiving side, and a light beam incident from the transmitting / receiving side exits via the second side. The transmitting optical system is located on the first side of the beam splitter, and the receiving optical system is located on the second side of the beam splitter.

[0016] The second mounting module is used to mount the light source module on the transceiver side of the beam splitter.

[0017] In one possible implementation, the light source module includes a first light source, a second light source, and a first beam splitter; the light adjustment device further includes a second collimator; a second mounting module is used to mount the first light source on the transmitting side of the beam splitter, and to mount the second collimator on the incident side of the transmitting optical system, so that the first beam, the optical axis of the transmitting optical system, and a fourth optical axis coincide, wherein the fourth optical axis is the optical axis of the second collimator; the first beam splitter is mounted between the first light source and the beam splitter, and the propagation direction of the first beam remains unchanged; the second light source is mounted on a third side of the first beam splitter so that the second beam and the first beam spot on the second collimator coincide; and the first light source and the second light source are adjusted so that the first beam and the second beam are symmetrical about the first optical axis when incident on the receiving optical system; wherein the first beam splitter has a first side facing the first light source, a second side facing the beam splitter, and a third side facing the second light source.

[0018] In one possible implementation, the light-adjusting device further includes a target plate;

[0019] The second mounting module is further configured to place the target plate on the fourth side of the first beam splitter, the fourth side being opposite to the third side; and to adjust the second light source and / or the first beam splitter so that the first beam coincides with the light spot formed by the target plate of the second light source.

[0020] In one possible implementation, the adjustment module is used to control the first light source to move a first distance along a first direction; and to control the second light source to move the first distance along a second direction; wherein the first direction is a direction perpendicular to the first plane, the first plane is a plane determined by the optical axis of the emitting optical system and the first optical axis, and the second direction is opposite to the first direction.

[0021] In one possible implementation, the light adjustment device further includes an optical path deflection element for changing the propagation direction of the light beam; a third mounting module for removing the optical transceiver module; mounting the optical path deflection element on the optical path of the first light beam and the second light beam directed to the first preset position, so that the first light beam and the second light beam coincide in the spot of the first collimator; moving the second collimator to a position where the fourth optical axis coincides with the second optical axis; and mounting a second beam splitter between the optical path deflection element and the first collimator, so that the first light beam and the second light beam coincide in the spot of the first collimator, and the first light beam and the second light beam coincide in the spot of the second collimator.

[0022] In one possible implementation, the first mounting module is further configured to remove the optical path deflection element and to mount the optical transceiver module at the first preset position.

[0023] In one possible implementation, the adjustment module is configured to determine whether the center of symmetry is located within a preset distance range of the center of the imaging element; and if the center of symmetry is not located within a preset distance range of the center of the imaging element, to control the reflector to rotate around a first rotation axis and a second rotation axis so that the center of symmetry is located within a preset distance range of the center of the imaging element of the collimator.

[0024] Wherein, the first rotation axis and the second rotation axis are parallel to the reflector before the reflector rotates, and the first rotation axis and the second rotation axis intersect.

[0025] In one possible implementation, the adjustment module is configured to determine whether the distance between the first beam and the second beam in the first collimator is within a preset distance range if the center of symmetry is located within a preset distance range of the center of the imaging element; and if the distance is not within the preset distance range, to move the reflector along a preset translation direction so that the distance is within the preset distance range; wherein the preset translation direction is perpendicular to the reflector before the reflector is rotated.

[0026] In one possible implementation, the adjustment module is further configured to verify whether the center of symmetry is within a preset distance range of the center of the imaging element; and if the center of symmetry is not within a preset distance range of the center of the imaging element, return to the step of controlling the reflector to rotate around the first rotation axis and the second rotation axis so that the center of symmetry is within a preset distance range of the center of the imaging element of the collimator.

[0027] In one possible implementation, the calibration device further includes a fixing module for fixing the reflector to the housing of the optical transceiver module if the center of symmetry is within a preset distance range of the center of the imaging element and the distance between the light spots of the first beam and the second beam in the first collimator is within a preset distance range.

[0028] On one hand, an optical modulation device is provided, the optical modulation device including one or more processors and one or more memories, the one or more memories storing at least one computer program, the computer program being loaded and executed by the one or more processors to implement the calibration method of the optical transceiver module.

[0029] On one hand, a computer-readable storage medium is provided, wherein at least one computer program is stored in the computer-readable storage medium, the computer program being loaded and executed by a processor to implement the calibration method of the optical transceiver module.

[0030] On one hand, a computer program product or computer program is provided, which includes program code stored in a computer-readable storage medium. The processor of the optical modulation device reads the program code from the computer-readable storage medium and executes the program code, causing the optical modulation device to perform the above-described calibration method for the optical transceiver module.

[0031] The technical solution provided in this application uses a first beam and a second beam that are parallel to each other to actively adjust the reflector in the optical transceiver module. By utilizing the multiple information provided by the light spots of the first beam and the second beam in the collimator, the accuracy of the reflector attitude adjustment is improved, thereby improving the accuracy of subsequent detection using the optical transceiver module. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a flowchart of a calibration method for an optical transceiver module provided in an embodiment of this application;

[0034] Figure 2 This is a flowchart of another calibration method for an optical transceiver module provided in an embodiment of this application;

[0035] Figure 3 This is a schematic diagram of the structure of a receiving optical module provided in an embodiment of this application;

[0036] Figure 4 This is a schematic diagram of a calibration process provided in an embodiment of this application;

[0037] Figure 5 This is a schematic diagram of another calibration process provided in an embodiment of this application;

[0038] Figure 6 This is a schematic diagram of yet another calibration process provided in an embodiment of this application;

[0039] Figure 7 This is a schematic diagram of another calibration process provided in the embodiments of this application;

[0040] Figure 8This is a schematic diagram of another calibration process provided in the embodiments of this application;

[0041] Figure 9 This is a flowchart illustrating the adjustment of a reflector according to an embodiment of this application;

[0042] Figure 10 This is a schematic diagram of the structure of a calibration device for an optical transceiver module provided in an embodiment of this application. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0044] In this application, the terms "first," "second," etc., are used to distinguish identical or similar items with essentially the same function. It should be understood that there is no logical or temporal dependency between "first," "second," and "nth," nor are there any restrictions on quantity or execution order.

[0045] In order to illustrate the technical solutions provided in the embodiments of this application, the terms involved in the embodiments of this application will be introduced first.

[0046] Active Alignment (AA) refers to the process of actively adjusting parameters in an optical system through human intervention in order to improve the performance of the optical system.

[0047] Lens: A lens is an important optical element widely used in various optical systems. The basic definition of a lens is a transparent body bounded by two refractive surfaces, typically made of optical glass through grinding and polishing processes. The two surfaces of a lens can be flat or curved, but at least one surface must be curved to be considered a lens. The main function of a lens is to converge or diverge light through the refraction of light across its two surfaces.

[0048] A reflector is an optical element primarily used to change the direction of light propagation. Based on their shape, reflectors can be classified as plane reflectors, spherical reflectors, and aspherical reflectors; according to their degree of reflection, they can be classified as total internal reflection mirrors and semi-reflective mirrors (also known as beam splitters). In this embodiment, the reflector is a plane reflector.

[0049] A beam splitter is an optical element primarily used to split a beam of incident light into two or more beams. Depending on the application and requirements, beam splitters can be classified into various types, including unpolarized beam splitters, polarized beam splitters, and dichroic mirrors. In this embodiment, the beam splitter separates the probe light from the echo light; the probe light is the beam used to detect the target object, and the echo light is the beam formed after the probe light is reflected from the target object.

[0050] Collimator: An optical instrument primarily used to generate parallel beams of light. It is an important tool for the calibration and adjustment of optical instruments, and also a crucial component of optical metrology instruments. Through a specific optical system, it focuses light emitted from a light source through a condenser lens and reflects it off a beam splitter to uniformly illuminate the reticle. When the reticle is located on the focal plane of the objective lens, its image is projected at infinity in the image space, forming a parallel beam of light.

[0051] Optical axis: The central axis of an optical system; for example, the optical axis of a lens is its central axis.

[0052] Target objects: Targets detected by lidar or other active detection devices, including but not limited to: vehicles, pedestrians, roads, buildings, and vegetation.

[0053] In related technologies, the positioning accuracy of the reflector's attitude and position is relatively low. For example, some solutions in related technologies employ a single-beam active optical modulation scheme. If the single beam is incident along the optical axis of the receiving optical system, the focal length change of the receiving optical system cannot be determined based on the position of the moving reflector, thus making it impossible to determine the reflector's position. If the single beam is incident parallel to the receiving optical system of the transceiver module off-axis, the output light will have an angle, which is difficult to monitor, making it inconvenient to determine the reflector's attitude and position based on the output beam. By adopting the technical solution provided in this application, two parallel beams are incident. The reflector's attitude can be characterized by the center of symmetry of the two light spots in the first collimator, and the reflector's position can be characterized by the distance between the two light spots in the first collimator. Therefore, this application embodiment can achieve the calibration of the reflector's attitude and position, improving the reflector's calibration accuracy.

[0054] The application scenarios of the technical solutions provided in the embodiments of this application are described below. These solutions can be applied to scenarios involving active light adjustment of mirrors in lidar, projectors, and robots using laser detection components. Of course, in addition to the scenarios described above, the technical solutions provided in the embodiments of this application can also be applied to other scenarios using laser detection components, and this application does not limit their application to such applications.

[0055] By employing the technical solution provided in the embodiments of this application, a first beam and a second beam that are parallel to each other are used to actively adjust the reflector in the optical transceiver module. By utilizing the multiple information provided by the first beam and the second beam, the accuracy of the reflector's self-adjustment is improved, thereby improving the accuracy of subsequent detection using the optical transceiver module.

[0056] The technical solutions provided in the embodiments of this application are described below. (See also...) Figure 1 Taking the light-adjusting device as the executing entity as an example, the method includes the following steps.

[0057] S101. Install the optical transceiver module in the first preset position.

[0058] The aforementioned optical adjustment device is an automated active optical adjustment platform capable of automatically placing and adjusting the position and orientation of different optical components through mechanized modules. The optical transceiver module includes a receiving optical system, which comprises a first lens, a reflector, and a second lens arranged sequentially along the receiving optical path. That is, during the calibration of the reflector, the light beam passes through the first lens and reaches the reflector, which reflects the beam towards the second lens. The beam then passes through the second lens and exits outside the receiving optical system. In this embodiment, the first and second lenses include at least one convex lens, and the function of the receiving optical system is to converge the light beam. It should be noted that the "first preset position" mentioned in this application is a pre-set position for installing the optical transceiver module. The arrangement of other components in this method is based on the optical transceiver module located at the "first preset position." The "first preset position" is set by a technician according to actual conditions, and this embodiment does not limit this setting.

[0059] S102. Install the light source module on the light-incident side of the receiving optical system so that the first beam and the second beam are symmetrical about the first optical axis in the upstream optical path of the receiving optical system.

[0060] The aforementioned light adjustment device includes a light source module, which provides a first beam and a second beam that are parallel to each other, enabling the calibration of the reflector's position using these beams. The receiving optical system has an incident side and an exit side. The incident side is the side along the optical path closest to the first lens, i.e., the side of the receiving optical system used to receive the beam, which is also the upstream side of the optical path. The exit side is the side along the optical path closest to the second lens, i.e., the side of the receiving optical system used to emit the beam, which is also the downstream side of the optical path. Installing the light source module on the incident side of the receiving optical system allows the first and second beams emitted by the light source module to enter the receiving optical system through the incident side. The first optical axis is the optical axis of the first lens. The symmetrical arrangement of the first and second beams about the first optical axis upstream of the optical path of the receiving optical system helps them continue to propagate symmetrically about the optical axis of the output position of the receiving optical system (i.e., the optical axis of the second lens) after passing through the receiving optical system; of course, this is based on the reflector being in the correct orientation. Conversely, based on step S102, if the orientation of the reflector is adjusted to the correct orientation, the first beam and the second beam will be in a state of symmetry about the second optical axis after being emitted into the optical transceiver module.

[0061] S103. The first collimator is installed on the light-emitting side of the receiving optical system so that the first collimator is configured such that the light beam emitted through the second optical axis can be incident on the first collimator along the third optical axis.

[0062] The aforementioned light adjustment device includes a first collimator, which receives a first light beam and a second light beam emitted through the second lens. By installing the first collimator on the light-emitting side of the receiving system, the first and second light beams can be received through the first collimator. Furthermore, the orientation and position of the reflector can be determined based on the spot positions of the first and second light beams on the imaging element of the first collimator. Here, the second optical axis is the optical axis of the second lens, and the third optical axis is the optical axis of the first collimator. The configuration of the first collimator such that light beams emitted through the second optical axis can enter the first collimator along the third optical axis means that the optical axes of the second lens and the first collimator are on the same optical path, not that the light beams will propagate along both the second and third optical axes during calibration. Therefore, when the first and second light beams propagate symmetrically about the second optical axis, they will still enter the first collimator symmetrically about the third optical axis. As for the field of view of the first collimator, it can be set by technicians according to the actual situation; for example, in some embodiments, the field of view of the first collimator is 15°; of course, in other embodiments, the field of view of the first collimator can also be other angles, and this application embodiment does not limit this.

[0063] S104. Adjust the reflector so that the center of symmetry of the light spots of the first beam and the second beam in the first collimator is within a preset distance range from the center of the imaging element of the collimator.

[0064] The first collimator contains an optical system, namely a lens group, which converges the first and second beams incident on it. After convergence, the first and second beams fall onto the imaging element, forming a light spot. The phrase "the center of symmetry of the light spots formed by the first and second beams within the first collimator" refers to the center of symmetry formed by the light spots created by the first and second beams. Ideally, if the reflector is in the correct orientation, the first and second beams, after initial convergence by the receiving optical system, will enter the first collimator symmetrically about the third optical axis. Furthermore, they will pass through the lens group within the first collimator, and their light spots on the imaging element will also be symmetrical about the center of the imaging element; that is, the center of symmetry of the light spots formed by the first and second beams will fall on the center of the imaging element. Considering that the actual calibration process of the reflector attitude may contain errors compared to an ideal state, it is sufficient to limit the position of the aforementioned center of symmetry to be approximately the same as the center of the imaging element, that is, the aforementioned center of symmetry is located within a preset distance range of the center of the imaging element. Here, "preset distance range" refers to a distance range where the center of symmetry and the center of the imaging element can be considered to roughly coincide. For example, in some embodiments, the "preset distance range" can be [0 pixel, 5 pixel]. Of course, in other embodiments, the "preset distance range" can also be other ranges, and this application embodiment does not limit this. Conversely, by determining whether the center of symmetry of the light spots of the first beam and the second beam is located within the preset distance range of the center of the imaging element, it can be determined whether the reflector attitude has been calibrated to the correct position. It should be noted that since the light spot is located on the imaging element of the first collimator, the "preset distance range" is a pixel distance, and the aforementioned "pixel" means pixel; for example, 5 pixels means 5 pixels. In some embodiments, the imaging element is a CMOS (Complementary Metal Oxide Semiconductor) image sensor.

[0065] The technical solution provided in this application embodiment uses a first beam and a second beam that are parallel to each other to actively adjust the reflector in the optical transceiver module. By utilizing the multiple information provided by the light spots of the first beam and the second beam in the collimator, the attitude of the reflector can be precisely adjusted, thereby improving the accuracy of detection using the optical transceiver module.

[0066] The above steps S101-S104 are a brief introduction to the technical solutions provided by the embodiments of this application. The technical solutions provided by the embodiments of this application will be explained more clearly below with reference to some examples. See [link to relevant documentation]. Figure 2 Taking the light-adjusting device as the executing entity as an example, the method includes the following steps.

[0067] S201. Install the optical transceiver module in the first preset position.

[0068] The aforementioned optical adjustment device is an automated active optical adjustment platform capable of automatically placing and adjusting the positions of different optical components through mechanized modules. The optical transceiver module includes a receiving optical system comprising a first lens, a reflector, and a second lens arranged sequentially along the receiving optical path. That is, during the calibration of the reflector, the light beam passes through the first lens and reaches the reflector, which reflects the beam towards the second lens. The beam then passes through the second lens and exits outside the receiving optical system. In this embodiment, the first and second lenses include at least one convex lens, and the function of the receiving optical system is to converge the light beam. It should be noted that the "first preset position" mentioned in this application is a pre-set position for installing the optical transceiver module. The arrangement of other components in this method is based on the optical transceiver module located at the "first preset position." The "first preset position" is set by a technician according to actual conditions, and this embodiment does not limit this setting.

[0069] In this embodiment, the target adjustment stage is a workbench used to install, assemble, and calibrate the optical transceiver module. The target adjustment stage is a five-axis adjustment stage, meaning it has five degrees of freedom. First, the surface of the target adjustment stage is adjusted to be level; for example, the target adjustment stage may have a built-in level, which can be used as a reference to level the surface. Then, the optical transceiver module is detachably installed at a first preset position on the surface of the target adjustment stage; for example, the optical adjustment device uses a robotic arm to install the optical transceiver module on the surface of the target adjustment stage.

[0070] S202. Install the light source module on the light-incident side of the receiving optical system so that the first beam and the second beam are symmetrical about the first optical axis in the upstream optical path of the receiving optical system.

[0071] The aforementioned light adjustment device includes a light source module, which provides a first beam and a second beam that are parallel to each other, enabling the calibration of the reflector's position using these beams. The receiving optical system has an incident side and an exit side. The incident side is the side along the optical path closest to the first lens, i.e., the side of the receiving optical system used to receive the beam, which is also the upstream side of the optical path. The exit side is the side along the optical path closest to the second lens, i.e., the side of the receiving optical system used to emit the beam, which is also the downstream side of the optical path. Installing the light source module on the incident side of the receiving optical system allows the first and second beams emitted by the light source module to enter the receiving optical system through the incident side. The first optical axis is the optical axis of the first lens. The symmetrical arrangement of the first and second beams about the first optical axis upstream of the optical path of the receiving optical system helps them continue to propagate symmetrically about the optical axis of the output position of the receiving optical system (i.e., the optical axis of the second lens) after passing through the receiving optical system; of course, this is based on the reflector being in the correct orientation. Conversely, based on step S202, if the orientation of the reflector is adjusted to the correct orientation, the first beam and the second beam will be in a state of symmetry about the second optical axis after being emitted into the optical transceiver module.

[0072] In one possible implementation, the optical transceiver module includes a transmitting optical system, a beam splitter, and a receiving optical system. The beam splitter has a first side, a transmitting / receiving side, and a second side. The beam splitter is configured such that a light beam incident from the first side exits through the transmitting / receiving side, and a light beam incident from the transmitting / receiving side exits through the second side. The transmitting optical system is located on the first side of the beam splitter, and the receiving optical system is located on the second side. Thus, the probe beam processed by the transmitting optical system propagates sequentially through the first and transmitting / receiving sides of the beam splitter outwards from the optical transceiver module, while the echo beam propagates sequentially through the transmitting / receiving side and the second side of the beam splitter towards the receiving optical system. When the light source module is mounted on the transmitting / receiving side of the beam splitter by a light-adjusting device, the first and second light beams generated by the light source module sequentially pass through the transmitting / receiving side and the second side to reach the incident light side of the receiving optical system and enter the receiving optical system.

[0073] In this embodiment, the beam splitter is a slit mirror. The surface of the slit mirror facing the transmitting / receiving side is provided with a reflective material layer, and the slit mirror also has a through-hole structure in its central portion. Taking this optical transceiver module used in lidar as an example, the probe beam processed by the transmitting optics system generally has a small spot size when it reaches the beam splitter (the collimated beam travels a short distance, resulting in less spot diffusion). Therefore, the probe beam will be transmitted from the first side to the second side of the beam splitter through the aforementioned hole structure. When receiving the echo beam, the echo beam generally has a larger spot size (the beam travels a long distance, resulting in greater spot diffusion) and will cover the aforementioned hole structure. Therefore, a small portion of the echo beam will be transmitted to the first side through the aforementioned hole structure, while the majority will be reflected by the aforementioned reflective material layer to the second side and received by the receiving optics system.

[0074] The light source module is installed on the transceiver side of the beam splitter. The first and second beams emitted by the light source module can propagate to the transceiver side of the beam splitter, and then, under the reflection of the beam splitter, propagate to the incident side of the receiving optical system and enter the receiving optical system. For example, see... Figure 3 The optical transceiver module 300 includes a transmitting optical system 301, a beam splitter 302, and a receiving optical system 303. The transmitting optical system 301 includes a third lens 3011 and a fourth lens 3012; the receiving optical system 303 includes a first lens 3031, a reflector 3032, and a second lens 3033, wherein the reflector 3032 is a reflector that needs to be adjusted.

[0075] For example, see Figure 4The light source module includes a first light source 401, a second light source 402, and a first beam splitter 403. The first beam is emitted by the first light source 401, and the second beam is emitted by the second light source 402. Both the first and second light sources 401 can be lasers. Furthermore, the light adjustment device includes a second collimator 404. The light adjustment device mounts the first light source 401 on the transmitting and receiving side of the beam splitter, mounts the second collimator 404 on the incident side of the transmitting optical system, and adjusts the first light source 401 and the second collimator 404 to make the first beam, the optical axis of the transmitting optical system, and the fourth optical axis coincide. This process can be completed using a laser level; the fourth optical axis is the optical axis of the second collimator 404. The light adjustment device mounts the first beam splitter 403 between the first light source 401 and the beam splitter, and maintains the propagation direction of the first beam unchanged. The light-adjusting device mounts the second light source 402 on the third side of the first beam splitter 403 so that the second beam coincides with the spot of the first beam in the second collimator 404. The light-adjusting device adjusts the first light source 401 and the second light source 402 so that the first beam and the second beam are symmetrical about the first optical axis when incident on the receiving optical system. The first beam splitter 403 has a first side facing the first light source 401, a second side facing the beam splitter, and a third side facing the second light source 402.

[0076] A portion of the first beam, incident from the first side of the first beam splitter 403 and passing through it, exits from the second side without changing its propagation direction, thus entering the beam splitter; in other words, the first beam is perpendicular to the first side of the first beam splitter 403. A portion of the second beam, incident from the third side of the first beam splitter 403, changes its propagation direction and exits from the second side, thus entering the beam splitter; in other words, the second beam is perpendicular to the third side. Since the first beam, the optical axis of the emitting optical system, and the fourth optical axis coincide, the first beam can propagate along the optical axis and the fourth optical axis of the emitting optical system, meaning the first beam can pass through the center of the second collimator 404. The second beam and the first beam overlap at the spot of the second collimator 404, which means that the second beam and the first beam are parallel or overlapped at the beam splitter after passing through the first beam splitter 403. It should be noted that if the second beam is parallel to the first beam, due to the presence of the transmitting optical system, the second beam will intersect with the first beam after being output through the transmitting optical system, thus causing the spots of the first beam and the second beam to not overlap at the second collimator 404. Conversely, by controlling the spots of the first beam and the second beam to overlap at the second collimator 404, it can be ensured that the second beam and the first beam are emitted from the first beam splitter 403 to the beam splitter in an overlapping state.

[0077] Besides determining whether the first and second beams are emitted from the first beam splitter 403 towards the beam splitter by judging how their spots overlap in the second collimator 404, other embodiments of this application can achieve the above objective in other ways. For example, in some embodiments, a target plate is provided on the fourth side of the first beam splitter 403, and the above objective is determined by adjusting the second light source 402 and / or the first beam splitter 403 so that the spots formed by the first and second beams on the target plate overlap; wherein the fourth side and the third side are opposite sides of the first beam splitter 403. Specifically, see Figure 5 The light-adjusting device also includes a target plate 501, which is placed on the fourth side of the first beam splitter 502 via a mechanical actuator such as a robotic arm. Then, the light-adjusting device adjusts the second light source 503 and / or the first beam splitter 502 so that the first beam coincides with the light spot formed by the second light source 503 and the target plate 501. Because the beam splitter has a semi-transparent, semi-reflective property, after the first beam enters from the first side of the first beam splitter 502, a portion will exit from the second side, and another portion will exit from the fourth side; correspondingly, after the second beam enters from the third side of the first beam splitter 502, a portion will exit from the second side, and another portion will exit from the fourth side. With the target plate 501 placed on the fourth side of the first beam splitter 502, both the first and second beams will form light spots on the target plate 501. The overlap of the light spot formed by the first beam and the second light source 503 on the target plate 501 indicates that the first and second light sources 503 intersect at the same point on the first beam splitter 502, that is, the portions of the first and second beams emitted from the fourth side of the first beam splitter 502 overlap. Similarly, the portions of the first and second beams emitted from the second side of the first beam splitter 502 also overlap. Therefore, when the light spots of the first and second beams on the target plate 501 overlap, it indicates that the second light source 503 and the first beam splitter 502 are adjusted.

[0078] Since the first and second beams are currently aligned with the aperture structure of the beam splitter and the fourth optical axis of the second collimator, respectively, and both beams are emitted by lasers with small spot sizes, they will not be reflected by the reflective material layer of the beam splitter. Therefore, the positions of the first and second beams need to be adjusted to ensure they fall onto the reflective material layer of the beam splitter and are reflected to the receiving optical system, while also ensuring they are symmetrical about the first optical axis of the first lens. In some embodiments, the light adjustment device controls the first light source 401 to move a first distance (e.g., 2.5 mm) along a first direction (as shown in the positive Z-axis direction), and controls the second light source 402 to move a first distance along a second direction (the negative Z-axis direction). The first direction is perpendicular to the first plane, which is the plane defined by the optical axis of the transmitting optical system and the first optical axis. The second direction is opposite to the first direction. Thus, both the first beam and the second beam are parallel to the first optical axis, and the distance between them and the first optical axis is the same, that is, the first beam and the second beam are symmetrical about the first optical axis when they are incident on the receiving optical system.

[0079] To determine if the first and second beams satisfy the aforementioned symmetry about the first optical axis, the optical transceiver module can be removed, and the beam spots of the first and second beams in the second collimator can be observed to see if they overlap. If they do, it indicates that the first and second beams satisfy the requirement of symmetry about the first optical axis when incident on the receiving optical system. Otherwise, the positions of the first and / or second light sources need to be further adjusted until the beam spots of the first and second beams in the second collimator overlap. Alternatively, to determine if the first and second beams satisfy the aforementioned symmetry about the first optical axis, the second distance between the beam spots formed by the first and second beams on the target plate can be observed to be twice the first distance. If the second distance is twice the first distance, it indicates that the first and second beams satisfy the requirement of symmetry about the first optical axis when incident on the receiving optical system. Otherwise, the positions of the first and / or second light sources need to be further adjusted until the second distance is twice the first distance.

[0080] In some embodiments, a first aperture is placed between the first light source and the first beam splitter, and a second aperture is placed between the second light source and the first beam splitter. The first and second apertures are used to filter stray light and improve calibration accuracy. The placement of the first and second apertures does not affect the process and results described above. In some embodiments, a third aperture is placed between the first beam splitter and the beam splitter, and a fourth aperture is placed between the first beam splitter and the target plate. The third and fourth apertures are also used to filter stray light, and their placement does not affect the process and results described above.

[0081] S203. The first collimator is installed on the light-emitting side of the receiving optical system so that the first collimator is configured such that the light beam emitted through the second optical axis can be incident on the first collimator along the third optical axis.

[0082] The aforementioned light adjustment device includes a first collimator, which receives a first light beam and a second light beam emitted through the second lens. By installing the first collimator on the light-emitting side of the receiving system, the first and second light beams can be received through the first collimator. Furthermore, the orientation and position of the reflector can be determined based on the spot positions of the first and second light beams on the imaging element of the first collimator. Here, the second optical axis is the optical axis of the second lens, and the third optical axis is the optical axis of the first collimator. The configuration of the first collimator such that light beams emitted through the second optical axis can enter the first collimator along the third optical axis means that the optical axes of the second lens and the first collimator are on the same optical path, not that the light beams will propagate along both the second and third optical axes during calibration. Therefore, when the first and second light beams propagate symmetrically about the second optical axis, they will still enter the first collimator symmetrically about the third optical axis. As for the field of view of the first collimator, it can be set by technicians according to the actual situation; for example, in some embodiments, the field of view of the first collimator is 15°; of course, in other embodiments, the field of view of the first collimator can also be other angles, and this application embodiment does not limit this.

[0083] In one possible implementation, the light-adjusting device further includes an optical path deflection element and a second beam splitter; the optical path deflection element is used to change the propagation direction of the light beam, and the second beam splitter is used to transmit and reflect the light beam. Step S203 above includes the following steps S2031 to S2036.

[0084] S2031. Remove the optical transceiver module. Because the receiving optical system of the optical transceiver module deflects the first and second beams, if the first collimator is directly installed on the light-emitting side of the receiving optical system, it is impossible to determine whether the second and third optical axes are on the same optical path by observing the light spots of the first and second beams in the first collimator. Therefore, it is necessary to remove the optical transceiver module and guide the first and second beams to the first collimator by reflection using an optical path deflection element. Specifically, the optical adjustment device can remove the optical transceiver module from the target adjustment stage using a mechanical module.

[0085] S2032. The optical path deflection element is installed on the optical path of the first beam and the second beam as they are directed toward the first preset position, so that the light spots of the first beam and the second beam coincide in the first collimator. The optical path deflection element is used to replace the removed optical transceiver module to deflect the first beam and the second beam, so that both the first beam and the second beam can enter the first collimator perpendicularly. In some embodiments, the optical path deflection element is a pentagonal prism, a beam splitter, or a reflector. See also Figure 6Viewing from above the surface of the five-axis adjustment stage, with the pentagonal prism 601 as the optical path deflection element, install and adjust the pentagonal prism 601 so that one right-angled side (denoted as the first right-angled side) is perpendicular to the first and second beams, and the other right-angled side (denoted as the second right-angled side, adjacent to the first right-angled side) is perpendicular to the first right-angled side; the first collimator 602 is positioned towards the second right-angled side. Thus, the first and second beams enter from the first right-angled side, exit from the second right-angled side, and are directed towards the first collimator 603. Further, the position and orientation of the first collimator 603 need to be adjusted so that both the first and second beams can be perpendicularly incident on the first collimator 603; this can be determined by whether the light spots of the first and second beams overlap in the first collimator 603, thus determining whether the first and second beams are perpendicularly incident on the first collimator 603. It should be noted that, since it is necessary to ensure that the first beam and the second beam enter the first collimator 603 symmetrically, in step S202 when the light spots of the first beam and the second beam overlap in the second collimator, the first collimator can be configured so that its height is consistent with the height of the first collimator or the first beam. This facilitates the symmetry of the first beam and the second beam about the horizontal center plane of the first collimator (which passes through the third optical axis and is coplanar with the first plane) after the first light source and the second light source are moved (i.e., the first beam and the second beam are configured symmetrically about the first optical axis). Then, by adjusting the position and orientation of the first collimator, the first beam and the second beam can converge at the same point in both the far-field mode and the near-field mode of the first collimator. This makes the first beam and the second beam symmetrical about the vertical center plane of the first collimator (which passes through the third optical axis and is perpendicular to the horizontal center plane). That is, the first beam and the second beam are symmetrical about the third optical axis. This also helps the first beam and the second beam to enter the first collimator symmetrically after the optical transceiver module is reinstalled in the first preset position.

[0086] When the optical path deflection element is a beam splitter, one side of the beam splitter (denoted as the first side) is perpendicular to the first beam and the second beam, and the other side of the beam splitter (denoted as the second side) faces the first collimator. The first beam and the second beam enter from the first side and exit from the second side, thereby enabling the first beam and the second beam to be directed towards the first collimator. When the optical path deflection element is a mirror, the angle between the mirror and the first beam and the second beam is 45°, thereby enabling the first beam and the second beam to be directed towards the first collimator. It should be noted that, in the above description, the first beam and the second beam refer to the first beam and the second beam emitted from the first beam splitter.

[0087] S2033. Move the second parallel light tube to a position where the fourth optical axis coincides with the second optical axis.

[0088] S2034. The second beam splitter is installed between the optical path deflection element and the first collimator, and the first beam and the second beam are made to coincide in the spot of the first collimator, and the first beam and the second beam are made to coincide in the spot of the second collimator.

[0089] Since the second optical axis of the first collimator is perpendicular to the first optical axis of the second lens of the optical transceiver module originally located at the first preset position, it is necessary to introduce a reflective element, such as a second beam splitter, that can reflect the light beam emitted from the second lens back to the first collimator. The specific position of the second beam splitter needs to be determined with the help of reconfiguring the position of the second collimator.

[0090] First, the light adjustment device moves the second collimator until the fourth optical axis coincides with the second optical axis. It should be noted that "the fourth optical axis coincides with the second optical axis" means that after the second collimator is translated, its fourth optical axis coincides with the position of the second optical axis when the optical transceiver module was in the first preset position. Then, the light adjustment device installs the second beam splitter between the optical path deflector and the first collimator, and adjusts the position of the second beam splitter so that the first beam and the second beam coincide in the spot of the first collimator, and also in the spot of the second beam in the second collimator. Finally, the light adjustment device fixes the first collimator. Thus, the side of the second beam splitter away from the second collimator will be perpendicular to the original second optical axis. If the optical transceiver module is reinstalled in the first preset position, the second optical axis of the second lens and the third optical axis of the first collimator will intersect at a point on the semi-transparent and semi-reflective surface of the second beam splitter; that is, the second optical axis and the third optical axis are located in the same optical path, and the light beam emitted through the second optical axis can be incident on the first collimator along the third optical axis.

[0091] S2035, Remove the optical path deflection element.

[0092] S2036. Install the optical transceiver module at the first preset position.

[0093] Since the positions and orientations of the first collimator and the second beam splitter have been determined in step S2034, the optical path deflection element can be removed using the optical adjustment device, and the optical transceiver module can be reinstalled in the first preset position. At this time, the first collimator satisfies the requirement that the beam emitted via the second optical axis can be incident on the first collimator along the third optical axis. See also Figure 7After removing the optical path deflection element and reinstalling the optical transceiver module 700, the positions of the first collimator 701, the second collimator 702, the first beam splitter 703, the second beam splitter 704, the first light source 705, the second light source 706, the target plate 707, and the optical transceiver module 700 are as follows: Figure 7 As shown. Since the subsequent adjustment of the reflector will not require the assistance of the second collimator and target plate, the second collimator and target plate can be removed from the target adjustment stage.

[0094] S204. Adjust the reflector so that the center of symmetry of the light spots of the first beam and the second beam in the first collimator is within a preset distance range from the center of the imaging element of the collimator.

[0095] The first collimator contains an optical system, namely a lens group, which converges the first and second beams incident on it. After convergence, the first and second beams fall onto the imaging element, forming a light spot. The phrase "the center of symmetry of the light spots formed by the first and second beams within the first collimator" refers to the center of symmetry formed by the light spots created by the first and second beams. Ideally, if the reflector is in the correct orientation, the first and second beams, after initial convergence by the receiving optical system, will enter the first collimator symmetrically about the third optical axis. Furthermore, they will pass through the lens group within the first collimator, and their light spots on the imaging element will also be symmetrical about the center of the imaging element; that is, the center of symmetry of the light spots formed by the first and second beams will fall on the center of the imaging element. Considering that the actual process of calibrating the reflector's attitude may contain errors compared to an ideal state, it is sufficient to limit the position of the aforementioned center of symmetry to be approximately the same as the center of the imaging element. That is, the aforementioned center of symmetry is located within a preset distance range from the center of the imaging element. Here, "preset distance range" refers to a distance range in which the center of symmetry and the center of the imaging element can be considered to roughly coincide. For example, in some embodiments, the "preset distance range" can be (0 pixels, 5 pixels). Of course, in other embodiments, the "preset distance range" can also be other ranges, and this application does not limit this. Conversely, by determining whether the center of symmetry of the light spots of the first beam and the second beam is located within the preset distance range from the center of the imaging element, it can be determined whether the reflector's attitude has been calibrated to the correct position.

[0096] In one possible implementation, the light adjustment device determines whether the center of symmetry is located within a preset distance range from the center of the imaging element. If the center of symmetry is not located within the preset distance range from the center of the imaging element, the light adjustment device controls the reflector to rotate around a first rotation axis and a second rotation axis, so that the center of symmetry is located within the preset distance range from the center of the imaging element of the collimator. The first rotation axis and the second rotation axis are parallel to the reflector before the reflector rotates, and the first rotation axis intersects the second rotation axis. In some embodiments, the first rotation axis is a horizontal rotation axis (X-axis), and the second rotation axis is a vertical rotation axis (Y-axis). The center of symmetry of the light spots of the first beam and the second beam within the first collimator is the rotationally symmetric center determined based on the two light spots.

[0097] For example, the light adjustment device can determine the lateral and longitudinal offset distances between the center of symmetry and the center of the imaging element. If both the lateral and longitudinal offset distances are less than or equal to a preset offset threshold, the light adjustment device determines that the center of symmetry is within a preset distance range of the center of the imaging element. If either the lateral or longitudinal offset distance is greater than the preset offset threshold, the light adjustment device determines that the center of symmetry is not within a preset distance range of the center of the imaging element. If the center of symmetry is not within a preset distance range of the center of the imaging element, the light adjustment device controls the reflector to rotate around a first rotation axis and a second rotation axis until the center of symmetry is within a preset distance range of the center of the collimator's imaging element. Similar to the aforementioned "preset distance range," the "preset offset threshold" described in this application is a pre-set distance value that allows the center of symmetry and the center of the first collimator's imaging element to be considered approximately coincident in the lateral or longitudinal direction. This offset threshold is set by a technician according to actual conditions, such as 5 pixels, etc., and this application embodiment does not limit this.

[0098] S205. If the center of symmetry is located within a preset distance range from the center of the imaging element, then determine whether the distance between the first beam and the second beam and the spot of the first collimator is within a preset distance range.

[0099] S206. If the distance is not within the preset distance range, move the reflector along the preset translation direction to make the distance within the preset distance range; wherein, the preset translation direction is perpendicular to the reflector before the reflector rotates.

[0100] Based on step S204 above, if the center of symmetry is located within a preset distance range from the center of the imaging element, it indicates that the orientation of the reflector is correct. At this point, it is necessary to further determine whether the distance between the reflector and the second lens is correct. Changing the distance between the reflector and the second lens alters the focal length of the entire receiving optical system, thereby changing the propagation direction of the first and second beams exiting from the second lens, and consequently changing the spot positions of the first and second beams in the first collimator, i.e., changing the distance between the two spots. Conversely, the correctness of the reflector's position can be determined by whether the distance between the spots of the first and second beams in the first collimator is within a preset distance range. It should be noted that in the design of the optical transceiver module, the reflector has a correct position. Based on this, the directions of the first and second beams exiting from the receiving optical system can be determined. Simultaneously, the parameters of the first collimator are known. Therefore, under ideal conditions, the distance between the spots formed by the first and second beams in the first collimator can be determined. For ease of explanation, the distance between the spots corresponding to the first and second beams under ideal conditions can be referred to as the first distance. The preset distance interval is a distance interval that includes the first spacing, and the upper and lower limits of the preset distance interval are close to the first spacing; for example, the upper limit can be 1.2 times the first spacing, and the lower limit can be 0.8 times the first spacing.

[0101] S207. Verify whether the above-mentioned center of symmetry is within a preset distance range of the center of the imaging element. If the center of symmetry is not within a preset distance range of the center of the imaging element, return to the step of controlling the reflector to rotate around the first rotation axis and the second rotation axis so that the center of symmetry is within a preset distance range of the center of the imaging element of the collimator.

[0102] Since moving the reflector may change the position of the center of symmetry on the imaging element, it is necessary to verify whether the center of symmetry is still within a preset distance range from the center of the imaging element. If the center of symmetry is not within the preset distance range from the center of the imaging element, the light adjustment device returns to the step of controlling the reflector to rotate around the first and second rotation axes to bring the center of symmetry within the preset distance range from the center of the collimator's imaging element.

[0103] In some embodiments, before adjusting the reflector, the light adjustment device removes the second collimator and the target plate, for example, see [link to relevant documentation]. Figure 8 When adjusting the reflector, the target adjustment stage is equipped with an optical transceiver module 800, a first collimator 801, a first beam splitter 802, a third beam splitter 803, a first light source 804, and a second light source 805.

[0104] S208. If the center of symmetry is within a preset distance range from the center of the imaging element, and the distance between the first beam and the second beam in the light spot of the first collimator is within a preset distance range, then the reflector is fixed to the housing of the optical transceiver module.

[0105] If the aforementioned center of symmetry is within a preset distance range from the center of the imaging element, it indicates that the orientation of the reflector is correct. If the distance between the light spots corresponding to the first beam and the second beam is within a preset distance range, it indicates that the distance between the reflector and the second lens is correct. That is, the orientation and position of the reflector have been calibrated. At this time, the reflector can be fixed to the housing of the receiving optical system.

[0106] The following will combine Figure 9 The steps S204 to S208 above will be explained.

[0107] See Figure 9 The reflector is loaded, and adhesive is applied after loading. The reflector is controlled to rotate around the first and second rotation axes, which is to perform coarse adjustment on the reflector. The lateral offset distance OC-X and longitudinal offset distance OC-Y between the center of symmetry of the light spots of the first and second beams within the first collimator and the center of the imaging element are determined to be less than or equal to a preset offset threshold of 5 pixels. If either the lateral or longitudinal offset distance is greater than the preset offset threshold, the light adjustment device determines that the center of symmetry is not within the preset distance range of the center of the imaging element, and continues to control the reflector to rotate around the first and second rotation axes until the center of symmetry is within the preset distance range of the center of the imaging element of the collimator. If both the lateral and longitudinal offset distances are less than or equal to the preset offset threshold, the light adjustment device determines that the center of symmetry is within the preset distance range of the center of the imaging element.

[0108] The light adjustment device determines whether the first distance m between the first beam and the second beam in the light spot of the first collimator is within a preset distance range [nk pixel, n+k pixel], where n is the first distance and k is a distance value determined based on calibration accuracy. n and k can be set by technicians according to actual conditions; for example, when designing an optical transceiver module, the ideal first distance is 4.23 pixels, so n can be set to 4.23 pixels. The required positional accuracy of the reflector calibration, converted to a pixel size of 0.04 pixels in the first collimator, can be set to 0.04 pixels, etc. If the distance m is not within the preset distance range [nk pixel, n+k pixel], the light adjustment device moves the reflector along a preset translation direction until the distance is within the preset distance range [nk pixel, n+k pixel].

[0109] If the spacing m is within the preset distance range [nk pixel, n+k pixel], the light adjustment device re-verifies whether the lateral offset distance OC-X and the longitudinal offset distance OC-Y between the center of symmetry of the first beam and the second beam spot in the first collimator and the center of the imaging element are both less than or equal to the preset offset threshold of 5 pixels. If at least one of the lateral offset distance OC-X and the longitudinal offset distance OC-Y between the center of symmetry and the center of the imaging element is greater than the preset offset threshold of 5 pixels, the control mirror is returned to rotate around the first rotation axis and the second rotation axis, that is, a coarse adjustment step is performed on the mirror until the lateral offset distance OC-X and the longitudinal offset distance OC-Y between the center of symmetry and the center of the imaging element are both less than the preset offset threshold of 5 pixels, and at the same time, the spacing m between the two light spots is within the preset distance range [nk pixel, n+k pixel]. If the aforementioned center of symmetry is within a preset distance range from the center of the imaging element, and the distance between the first beam and the second beam at the light spot of the first collimator is within a preset distance range, then the light adjustment device performs UV (Ultraviolet) curing on the reflector to fix the reflector.

[0110] All of the above-mentioned optional technical solutions can be combined in any way to form the optional embodiments of this application, and will not be described in detail here.

[0111] The technical solution provided in this application embodiment uses a first beam and a second beam that are parallel to each other to perform active optical modulation on the reflector in the optical transceiver module. By utilizing the multiple information provided by the light spots of the first beam and the second beam in the collimator, the attitude of the reflector can be precisely adjusted, thereby improving the accuracy of the reflector attitude adjustment and thus improving the accuracy of subsequent detection using the optical transceiver module.

[0112] Figure 10 This is a schematic diagram of a calibration device for an optical transceiver module provided in an embodiment of this application. The optical transceiver module includes a receiving optical system, which includes a first lens, a reflector, and a second lens arranged sequentially along the receiving optical path. This calibration device is a type of optical adjustment device, which includes a light source module and a first collimator. The light source module provides a first beam and a second beam that are parallel to each other, and the first collimator receives the first beam and the second beam emitted through the second lens. See [link to relevant documentation]. Figure 10 The calibration device includes a first mounting module 1001, a second mounting module 1002, a third mounting module 1003, and an adjustment module 1004.

[0113] The first installation module 1001 is used to install the optical transceiver module at a first preset position.

[0114] The second mounting module 1002 is used to mount the light source module on the light-incident side of the receiving optical system so that the first beam and the second beam are symmetrical about the first optical axis in the upstream optical path of the receiving optical system, wherein the first optical axis is the optical axis of the first lens.

[0115] The third mounting module 1003 is used to mount the first collimator on the light-emitting side of the receiving optical system, so that the first collimator is configured such that a light beam emitted through the second optical axis can be incident on the first collimator along the third optical axis, wherein the second optical axis is the optical axis of the second lens and the third optical axis is the optical axis of the first collimator.

[0116] The adjustment module 1004 is used to adjust the reflector so that the center of symmetry of the light spots of the first beam and the second beam in the first collimator is located within a preset distance range from the center of the imaging element of the collimator.

[0117] In one possible implementation, the optical transceiver module includes a transmitting optical system, a beam splitter, and a receiving optical system. The beam splitter has a first side, a transmitting side, and a second side. The beam splitter is configured such that a light beam incident from the first side exits through the transmitting side, and a light beam incident from the transmitting side exits through the second side. The transmitting optical system is located on the first side of the beam splitter, and the receiving optical system is located on the second side of the beam splitter.

[0118] The second mounting module 1002 is used to mount the light source module on the transceiver side of the beam splitter.

[0119] In one possible implementation, the light source module includes a first light source, a second light source, and a first beam splitter, and the light adjustment device further includes a second collimator. The second mounting module 1002 is used to mount the first light source on the transceiver side of the beam splitter and the second collimator on the incident light side of the transmitting optical system, so that the first beam, the optical axis of the transmitting optical system, and a fourth optical axis coincide, wherein the fourth optical axis is the optical axis of the second collimator. The first beam splitter is mounted between the first light source and the beam splitter, maintaining the propagation direction of the first beam unchanged. The second light source is mounted on a third side of the first beam splitter so that the second beam and the first beam coincide in the spot of the second collimator. The first and second light sources are adjusted so that the first and second beams are symmetrical about the first optical axis when incident on the receiving optical system. The first beam splitter has a first side facing the first light source, a second side facing the beam splitter, and a third side facing the second light source.

[0120] In one possible implementation, the light-adjusting device also includes a target plate.

[0121] The second mounting module 1002 is also used to place the target plate on the fourth side of the first beam splitter, the fourth side being opposite to the third side; and to adjust the second light source and / or the first beam splitter so that the first beam coincides with the light spot formed by the target plate of the second light source.

[0122] In one possible implementation, the adjustment module 1004 is used to control the first light source to move a first distance along a first direction, and to control the second light source to move the first distance along a second direction. The first direction is perpendicular to the first plane, the first plane is the plane defined by the optical axis of the emitting optical system and the first optical axis, and the second direction is opposite to the first direction.

[0123] In one possible implementation, the light adjustment device further includes an optical path deflection element for changing the propagation direction of the light beam. The third mounting module 1003 is used to remove the optical transceiver module and install the optical path deflection element on the optical path of the first light beam and the second light beam as they are directed toward the first preset position, so that the first light beam and the second light beam coincide in the spot of the first collimator. The third mounting module is also used to move the second collimator to a position where the fourth optical axis coincides with the second optical axis, and to install a second beam splitter between the optical path deflection element and the first collimator, so that the first light beam and the second light beam coincide in the spot of the first collimator, and the first light beam and the second light beam coincide in the spot of the second collimator.

[0124] In one possible implementation, the first mounting module 1001 is also used to remove the optical path deflection element and to mount the optical transceiver module at the first preset position.

[0125] In one possible implementation, the adjustment module 1004 is used to determine whether the center of symmetry is located within a preset distance range from the center of the imaging element; and to control the reflector to rotate around a first rotation axis and a second rotation axis if the center of symmetry is not located within the preset distance range from the center of the imaging element, so that the center of symmetry is located within the preset distance range from the center of the collimator's imaging element. The first rotation axis and the second rotation axis are parallel to the reflector before the reflector rotates, and the first rotation axis intersects the second rotation axis.

[0126] In one possible implementation, the adjustment module 1004 is used to determine whether the distance between the first beam and the second beam in the light spot of the first collimator is within a preset distance range if the center of symmetry is located within a preset distance range of the center of the imaging element; if the distance is not within the preset distance range, the mirror is moved along a preset translation direction so that the distance is within the preset distance range. The preset translation direction is perpendicular to the mirror before the mirror rotates.

[0127] In one possible implementation, the adjustment module 1004 is further configured to verify whether the center of symmetry is within a preset distance range of the center of the imaging element; and if the center of symmetry is not within a preset distance range of the center of the imaging element, return to the step of controlling the mirror to rotate around the first rotation axis and the second rotation axis so that the center of symmetry is within a preset distance range of the center of the imaging element of the collimator.

[0128] In one possible implementation, the calibration device further includes a fixing module for fixing the reflector to the housing of the optical transceiver module when the center of symmetry is within a preset distance range of the center of the imaging element and the distance between the first beam and the second beam of the light spot of the first collimator is within a preset distance range.

[0129] It should be noted that the calibration device for the optical transceiver module provided in the above embodiments is only an example of the division of the above functional modules when calibrating the receiving optical module. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the optical modulation device can be divided into different functional modules to complete all or part of the functions described above. In addition, the calibration device for the optical transceiver module provided in the above embodiments and the calibration method embodiments for the optical transceiver module belong to the same concept, and the specific implementation process is detailed in the method embodiments, which will not be repeated here.

[0130] The technical solution provided in this application uses a first beam and a second beam that are parallel to each other to actively adjust the reflector in the optical transceiver module. By utilizing the multiple information provided by the light spots of the first beam and the second beam in the collimator, the accuracy of the reflector attitude adjustment is improved, thereby improving the accuracy of subsequent detection using the optical transceiver module.

[0131] In an exemplary embodiment, a computer-readable storage medium is also provided, such as a memory including a computer program that can be executed by a processor to perform the calibration method for the optical transceiver module in the above embodiments. For example, the computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a compact disc read-only memory (CD-ROM), magnetic tape, a floppy disk, and an optical data storage device, etc.

[0132] In an exemplary embodiment, a computer program product or computer program is also provided, which includes program code stored in a computer-readable storage medium. The processor of the optical modulation device reads the program code from the computer-readable storage medium and executes the program code, causing the optical modulation device to perform the calibration method of the optical transceiver module described above.

[0133] In some embodiments, the computer program involved in the present application embodiments may be deployed and executed on a light-adjusting device, or on multiple light-adjusting devices located in one location, or on multiple light-adjusting devices distributed in multiple locations and interconnected through a communication network. Multiple light-adjusting devices distributed in multiple locations and interconnected through a communication network may form a blockchain system.

[0134] Those skilled in the art will understand that all or part of the steps of the above embodiments can be implemented by hardware or by a program instructing related hardware. The program can be stored in a computer-readable storage medium, such as a read-only memory, a disk, or an optical disk.

[0135] The above are merely optional embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for calibrating a mirror in an optical transceiver module, characterized in that, The optical transceiver module includes a receiving optical system, which includes a first lens, a reflector, and a second lens arranged sequentially along the receiving optical path. The calibration method is applied to a light adjustment device, which includes a light source module and a first collimator. The light source module provides a first beam and a second beam that are parallel to each other. The first collimator receives the first beam and the second beam emitted through a second lens. The calibration method includes: The optical transceiver module is installed in the first preset position; The light source module is installed on the light-incident side of the receiving optical system so that the first beam and the second beam are symmetrical about the first optical axis in the upstream optical path of the receiving optical system, wherein the first optical axis is the optical axis of the first lens; The first collimator is mounted on the light-emitting side of the receiving optical system, such that the first collimator is configured so that a light beam emitted via the second optical axis can be incident on the first collimator along the third optical axis, wherein the second optical axis is the optical axis of the second lens, and the third optical axis is the optical axis of the first collimator; and The reflector is adjusted so that the center of symmetry of the light spots of the first beam and the second beam within the first collimator is located within a preset distance range from the center of the imaging element of the collimator.

2. The calibration method according to claim 1, characterized in that, The optical transceiver module includes a transmitting optical system, a beam splitter, and a receiving optical system. The beam splitter has a first side, a transmitting side, and a second side. The beam splitter is configured such that a light beam incident from the first side exits through the transmitting side, and a light beam incident from the transmitting side exits through the second side. The transmitting optical system is located on the first side of the beam splitter, and the receiving optical system is located on the second side of the beam splitter. The step of mounting the light source module on the light-incident side of the receiving optical system includes: The light source module is installed on the transceiver side of the beam splitter.

3. The calibration method according to claim 2, characterized in that, The light source module includes a first light source, a second light source and a first beam splitter, and the light adjustment device also includes a second collimator. The step of mounting the light source module on the light-incident side of the receiving optical system, so that the first beam and the second beam are symmetrical about the first optical axis upstream of the optical path of the receiving optical system, includes: The first light source is installed on the transmitting and receiving side of the beam splitter, and the second collimator is installed on the light-incident side of the transmitting optical system, so that the first beam, the optical axis of the transmitting optical system, and the fourth optical axis coincide, wherein the fourth optical axis is the optical axis of the second collimator. The first beam splitter is installed between the first light source and the beam splitter, and the propagation direction of the first beam is kept unchanged. The second light source is mounted on the third side of the first beam splitter so that the second beam coincides with the spot of the first beam in the second collimator; and The first light source and the second light source are adjusted so that the first beam and the second beam are symmetrical about the first optical axis when incident on the receiving optical system; The first beam splitter has a first side facing the first light source, a second side facing the beam splitter, and a third side facing the second light source.

4. The calibration method according to claim 3, characterized in that, The light modulation device also includes a target plate; Before the step of adjusting the first light source and the second light source so that the first beam and the second beam are symmetrical about the first optical axis when incident on the receiving optical system, the step of mounting the light source module on the light-incident side of the receiving optical system so that the first beam and the second beam are symmetrical about the first optical axis in the upstream optical path of the receiving optical system further includes: The target plate is placed on the fourth side of the first beam splitter, and the fourth side is opposite to the third side. Adjust the second light source and / or the first beam splitter so that the first beam coincides with the light spot formed by the target plate of the second light source.

5. The calibration method according to claim 3, characterized in that, Adjusting the first light source and the second light source so that the first beam and the second beam are symmetrical about the first optical axis when incident on the receiving optical system includes: Control the first light source to move a first distance along a first direction; and Control the second light source to move the first distance along the second direction; Wherein, the first direction is the direction perpendicular to the first plane, the first plane is the plane determined by the optical axis of the emission optical system and the first optical axis, and the second direction is opposite to the first direction.

6. The calibration method according to claim 3, characterized in that, The light adjustment device also includes an optical path deflection element, which is used to change the propagation direction of the light beam; The step of mounting the first collimator on the light-emitting side of the receiving optical system, so that the first collimator is configured such that a light beam emitted via the second optical axis can be incident on the first collimator along the third optical axis, includes: Remove the optical transceiver module; The optical path deflection element is installed on the optical path of the first beam and the second beam directed toward the first preset position, so that the light spots of the first beam and the second beam coincide in the first collimator. Move the second collimator to a position where the fourth optical axis coincides with the second optical axis; and The second beam splitter is installed between the optical path deflection element and the first collimator, so that the first beam and the second beam coincide in the spot of the first collimator, and the first beam and the second beam coincide in the spot of the second collimator.

7. The calibration method according to claim 6, characterized in that, After the steps of installing the second beam splitter between the optical path deflection element and the first collimator, and making the first beam and the second beam coincide in the spot of the first collimator, and the first beam and the second beam coincide in the spot of the second collimator, the step of installing the first collimator on the light-emitting side of the receiving optical system, so that the first collimator is configured such that the beam emitted via the second optical axis can be incident on the first collimator along the third optical axis, further includes: Remove the optical path deflection element; and The optical transceiver module is installed at the first preset position.

8. The calibration method according to claim 1, characterized in that, Adjusting the reflector so that the centers of symmetry of the light spots of the first beam and the second beam within the first collimator are located within a preset distance range from the center of the imaging element of the collimator includes: Determine whether the center of symmetry is located within a preset distance range from the center of the imaging element; and If the center of symmetry is not located within a preset distance range from the center of the imaging element, then the mirror is controlled to rotate around the first rotation axis and the second rotation axis so that the center of symmetry is located within a preset distance range from the center of the imaging element of the collimator. Wherein, the first rotation axis and the second rotation axis are parallel to the reflector before the reflector rotates, and the first rotation axis and the second rotation axis intersect.

9. The calibration method according to claim 8, characterized in that, The calibration method further includes: If the center of symmetry is located within a preset distance range from the center of the imaging element, then determine whether the distance between the first beam and the second beam's spot in the first collimator is within a preset distance range; and If the spacing is not within the preset distance range, then the reflector is moved along the preset translation direction so that the spacing is within the preset distance range; The preset translation direction is perpendicular to the reflector before the reflector rotates.

10. The calibration method according to claim 9, characterized in that, After the step of moving the reflector along a preset translation direction to bring the spacing within a preset distance range, the calibration method further includes: Verify whether the center of symmetry is within a preset distance range from the center of the imaging element; and If the center of symmetry is not within a preset distance range from the center of the imaging element, then return to the step of controlling the mirror to rotate around the first rotation axis and the second rotation axis so that the center of symmetry is within a preset distance range from the center of the imaging element of the collimator.

11. The calibration method according to claim 1, characterized in that, The calibration method further includes: If the center of symmetry is within a preset distance range from the center of the imaging element, and the distance between the first beam and the second beam at the light spot of the first collimator is within a preset distance range, then the reflector is fixed to the housing of the optical transceiver module.

12. A calibration device for an optical transceiver module, characterized in that, The optical transceiver module includes a receiving optical system, which includes a first lens, a reflector, and a second lens arranged sequentially along the receiving optical path. The calibration device is a type of optical adjustment device, which includes a light source module and a first collimator. The light source module is used to provide a first beam and a second beam that are parallel to each other. The first collimator is used to receive the first beam and the second beam emitted through the second lens. The calibration device includes: The first installation module is used to install the optical transceiver module at a first preset position; The second mounting module is used to mount the light source module on the light-incident side of the receiving optical system, so that the first beam and the second beam are symmetrical about the first optical axis in the upstream optical path of the receiving optical system, wherein the first optical axis is the optical axis of the first lens; A third mounting module is used to mount the first collimator to the light-emitting side of the receiving optical system, such that the first collimator is configured so that a light beam emitted via the second optical axis can be incident on the first collimator along the third optical axis, wherein the second optical axis is the optical axis of the second lens, and the third optical axis is the optical axis of the first collimator; and An adjustment module is used to adjust the reflector so that the center of symmetry of the light spots of the first beam and the second beam within the first collimator is located within a preset distance range from the center of the imaging element of the collimator.

13. A light-adjusting device, characterized in that, The optical modulation device includes one or more processors and one or more memories, wherein the one or more memories store at least one computer program, which is loaded and executed by the one or more processors to implement the calibration method of the optical transceiver module as described in any one of claims 1 to 11.

14. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores at least one computer program, which is loaded and executed by a processor to implement the calibration method for an optical transceiver module as described in any one of claims 1 to 11.

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