A Collimation Lens Coupling Position Compensation Method and System for an Optical Emission Sub-module

Abstract

The present invention belongs to the field of optical communication technologies, and specifically provides a method and system for compensating the collimating lens coupling position of an optical emission sub-module. The method includes: fixing a laser, an isolator, an adapter, etc. with glue; powering on the laser and coupling a converging lens and a collimating lens; compensating the position of the collimating lens. This solution is carried out from the aspect of the coupling compensation method. Before coupling, the laser, isolator, adapter, etc. are first fixed with glue, and the remaining collimating lens and converging lens are coupled in an active manner, which can greatly improve the deviation between the actual compensated displacement and the target displacement compensation. This solution can make the center of the light spot coming out through the collimating lens and the converging lens coincide with the center of the optical fiber of the fiber optic adapter, minimize the influence of the optical emission sub-module on temperature changes or the deformation of the optical path structure, and maintain the optical power stability from the fiber optic adapter to the greatest extent. Ensure that there is no situation of optical power drop.

Description

Technical Field

[0001] The present invention relates to the field of optical communication technologies, and more specifically, to a method and system for compensating the collimating lens coupling position of an optical emission sub-module. Background Art

[0002] With the rapid development of 5G communication and the increasing demand of data centers, the market has an increasing demand for optical modules such as 10G, 25G, 100G, and 400G. Especially when the output optical power of the laser is limited, the requirement for optical coupling efficiency is also getting higher and higher. The coupling method of the optical emission component determines the optical coupling efficiency. It becomes more and more crucial to use what kind of coupling method to ensure the best coupling efficiency, thereby improving the yield of the product and obtaining lower costs. Usually, the optical components of the existing optical modules used adopt a double-lens system. The most basic components include a laser, a collimating lens, a converging lens, and a fiber optic adapter. Usually, there are also some other auxiliary components such as a TEC and an optical isolator. In the most ideal case, coupling requires the center of the light spot passing through the collimating lens and the converging lens to coincide with the center of the fiber of the fiber optic adapter, so as to minimize the influence of the temperature change or the deformation of the optical path structure on the optical emission sub-module and maintain the optical power stable as much as possible when coming out of the fiber optic adapter.

[0003] The traditional coupling method has the following problems:

[0004] 1. Before UV curing, a fixed distance is used for coupling position compensation, and the compensated distance is very small, usually about 0.6um. Since the motor used for coupling adopts a ball screw drive, and there is a gap between the screw and the ball, there will be an idle stroke when the motor moves back and forth. Therefore, there is a difference between the actual distance of the coupling position compensation and the predetermined compensation distance, resulting in the light spot reaching the core of the fiber optic adapter not being at the center of the core, and thus the optical power drops.

[0005] 2. When coupling, the lens is sucked by a vacuum nozzle. Since the lens is very small (the most commonly used lens size for high-speed optical modules is 0.6*0.6mm currently), the suction force of the nozzle is small, and the amount of position compensation before UV is also very small. Coupled with the viscous force of the glue at the bottom of the lens, the actual displacement amount of the compensation is smaller than the predetermined compensation displacement amount, which will also cause the light spot reaching the core of the fiber optic adapter not to be at the center of the core, and thus the optical power drops. Summary of the Invention

[0006] The present invention aims at the technical problem that there is a large deviation between the actual compensation displacement amount and the predetermined displacement compensation amount in the prior art.

[0007] The present invention provides a method for compensating the collimating lens coupling position of an optical emission sub-module, including the following steps:

[0008] S1, fix the laser, isolator, adapter, etc. with glue;

[0009] S2, power on the laser and couple the converging lens and the collimating lens;

[0010] S3, compensate for the position of the collimating lens.

[0011] Preferably, the S3 specifically includes:

[0012] S31, repeatedly adjust the position of the collimating lens in the X-axis, Y-axis, and Z-axis directions first to make the optical power value meet the target optical power specification range;

[0013] S32, move the collimating lens in the Z-axis direction and record the positions where the optical power reaches P0 twice;

[0014] S33, calculate the midpoint position where the optical power P0 appears twice, and obtain the final compensation position according to the midpoint position and the displacement amount of the glue UV + baking shrinkage;

[0015] S34, move the collimating lens in the Z-axis direction. When the optical power reaches the optical power value corresponding to the final compensation position for the second time, stop moving, and the compensation operation is completed.

[0016] Preferably, the S31 specifically includes:

[0017] S311, adjust the position of the collimating lens in the Y-axis and Z-axis directions to make the optical power coming out of the fiber optic adapter reach the maximum;

[0018] S312, compare whether the optical power is within the target optical power specification range. If it is within the specification range, continue to the next step. If it is not within the specification range, adjust the position of the collimating lens in the X-axis direction to make the optical power reach the target optical power specification range;

[0019] S313, readjust the position of the collimating lens in the Y-axis and Z-axis directions to make the optical power coming out of the fiber optic adapter reach the maximum;

[0020] S314, repeat steps S311 to S313 until the optical power coming out of the fiber optic adapter is within the target optical power specification range.

[0021] Preferably, the S32 specifically includes:

[0022] First, move 1 - 2um in the positive Z-axis direction with a step of 0.1, then move 0.1 - 1um in the negative Z-axis direction with a step of 0.1, and finally ensure that the total displacement in the positive Z-axis direction is greater than 0.5um, and record the optical power value P0 at this time;

[0023] Continue to move in the negative Z-axis direction in steps of 0.1 μm until the optical power value reaches the recorded optical power value P0 again, and output the optical power curve graph when the optical power reaches P0 twice.

[0024] Preferably, the S33 specifically includes:

[0025] After calculating the midpoint position where the optical power P0 appears twice, based on this midpoint position and the displacement amount of the glue due to UV + baking shrinkage, i.e., the glue shrinkage compensation amount, finally obtain the final compensation position in front of the collimating lens for UV as the midpoint position where the optical power P0 appears twice plus the glue shrinkage compensation amount, and then obtain the optical power at the corresponding final compensation position based on the final compensation position in front of the collimating lens for UV.

[0026] Preferably, the S34 specifically includes:

[0027] Make the collimating lens continue to move in steps of 0.1 μm in the positive Z-axis direction. When the optical power reaches the optical power at the final compensation position for the second time, stop moving, and the compensation operation is completed.

[0028] Preferably, the S2 specifically includes:

[0029] Fix the position of the converging lens in the X-axis direction, adjust the positions of the converging lens in the Y-axis and Z-axis directions, monitor the optical power coming out of the fiber optic adapter and make the optical power reach the maximum, then apply UV glue for UV curing to fix the converging lens, and then bake to further cure the glue under the converging lens;

[0030] Power on the laser, adjust the positions of the collimating lens in the X-axis, Y-axis, and Z-axis directions to make the light coming out of the fiber optic adapter reach the maximum. Then, defocus in the X-axis direction towards the laser side to attenuate the optical power, and after the optical power reaches the specification range of the target optical power, adjust the positions of the Y-axis and Z-axis directions to make the optical power reach the maximum. Then, repeat defocusing + adjusting the positions of the Y-axis and Z-axis directions. If the optical power reaches the specification range of the target optical power required for coupling after the last adjustment of the positions of the Y-axis and Z-axis directions, stop coupling.

[0031] The present invention also provides a collimating lens coupling position compensation system for an optical emission sub-module. The system is used to implement the collimating lens coupling position compensation method for the optical emission sub-module, and includes:

[0032] An installation and fixation module for fixing the laser, isolator, adapter, etc. with glue;

[0033] A coupling module for powering on the laser and coupling the converging lens and the collimating lens;

[0034] A position compensation module for compensating the position of the collimating lens.

[0035] The present invention also provides an electronic device, including a memory and a processor. When the processor executes a computer management program stored in the memory, the steps of the collimating lens coupling position compensation method for the optical emission sub-module are implemented.

[0036] The present invention also provides a computer-readable storage medium, on which a computer management program is stored. When the computer management program is executed by a processor, the steps of the collimating lens coupling position compensation method for the optical emission sub-module are implemented.

[0037] Beneficial effects: The present invention provides a collimating lens coupling position compensation method and system for an optical emission sub-module. The method includes: fixing a laser, an isolator, an adapter, etc. with glue; powering on the laser and coupling a converging lens and a collimating lens; compensating the position of the collimating lens. This solution mainly focuses on the coupling compensation method. Before coupling, the laser, isolator, adapter, etc. are first fixed with glue, and the remaining collimating lens and converging lens are coupled in an active manner, which can greatly improve the deviation between the actual compensation displacement and the target displacement compensation. This solution can make the center of the light spot coming out of the collimating lens and the converging lens coincide with the center of the optical fiber of the fiber optic adapter, minimize the influence of temperature changes or deformation of the optical path structure on the optical emission sub-module, and maintain the optical power stability from the fiber optic adapter to the greatest extent. Ensure that there is no situation of optical power drop. Description of the Drawings

[0038] Figure 1 It is a flowchart of the collimating lens coupling position compensation method for the optical emission sub-module provided by the present invention;

[0039] Figure 2 It is a schematic diagram of the hardware structure of a possible electronic device provided by the present invention;

[0040] Figure 3 It is a schematic diagram of the hardware structure of a possible computer-readable storage medium provided by the present invention;

[0041] Figure 4 It is a schematic diagram of the principle of the optical emission sub-module of the traditional single-channel double-lens system provided in the background technology of the present invention;

[0042] Figure 5 It is a displacement-optical power curve graph of the collimating lens provided by the present invention;

[0043] Figure 6 It is a midpoint graph of the positions where the optical power reaches P0 twice provided by the present invention;

[0044] Figure 7 It is a position graph of the lens after position compensation before the start of UV provided by the present invention. Detailed Embodiments

[0045] The following further describes in detail the specific embodiments of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0046] Figure 1 A method for compensating the collimating lens coupling position of an optical emission sub-module provided by the present invention includes the following steps:

[0047] S1. Fix the laser, isolator, adapter, etc. with glue; install the fiber optic adapter, isolator, and laser, and connect the laser to the corresponding wire bonding pads on the device housing through wire bonding; as Figure 4 shown, install and fix the laser, collimating lens, converging lens, and isolator inside the device housing, and install the fiber optic adapter outside the device housing. As Figure 4 shown, the position in the X-axis direction is generally defined as the position where the center of the fiber end face of the fiber optic adapter is located at the focal point of the lens.

[0048] S2. Power on the laser and couple the converging lens and the collimating lens. Fix the position of the converging lens in the optical path direction ( Figure 4 shown, the position in the X-axis direction is generally defined as the position where the center of the fiber end face of the fiber optic adapter is located at the focal point of the lens), adjust the positions of the converging lens in the Y-axis and Z-axis directions, monitor the optical power output from the fiber optic adapter and make the optical power reach the maximum, then dot UV glue and cure it by UV curing to fix the converging lens, and then bake to further cure the glue under the converging lens;

[0049] Power on the laser, grab a collimating lens, adjust the positions of the collimating lens in the X-axis, Y-axis, and Z-axis directions to make the optical power output from the fiber optic adapter reach the maximum, then defocus and attenuate the optical power toward the laser side in the X-axis direction until the optical power reaches the specified range of the target optical power, and then adjust the positions of the Y-axis and Z-axis directions to make the optical power reach the maximum. Then repeat defocusing + adjusting the positions of the Y-axis and Z-axis directions. If the optical power reaches the specified range of the target optical power required for coupling after the last adjustment of the positions of the Y-axis and Z-axis directions, stop the coupling.

[0050] S3. Compensate the position of the collimating lens. Dot UV glue, and then perform the operation of compensating the position of the collimating lens. The specific process of compensation is as follows.

[0051] S31. First, repeatedly adjust the positions of the collimating lens in the X-axis, Y-axis, and Z-axis directions to make the optical power value meet the specified range of the target optical power;

[0052] S32. Move the collimating lens and record the positions where the optical power value reaches P0 twice.

[0053] Specifically, first move 1 - 2 um in the positive Z-axis direction with a step of 0.1, then move 0.1 - 1 um in the negative Z-axis direction with a step of 0.1, and finally ensure that the total displacement in the positive Z-axis direction is greater than 0.5 um. Record the optical power value P0 at this time. This operation is to ensure that the collimating lens always moves in one direction when drawing the optical power curve next, so as to ensure that the subsequent movement can pass through the point where the optical power value is the target optical power value.

[0054] Then, move 0.5 um (which can be 0.1 - 1 um) in the negative Z-axis direction with a step of 0.1, and record the optical power value P0 at this time. Then continue to move in the negative Z-axis direction with a step of 0.1 um until the optical power value reaches the recorded optical power value P0 again. It is also possible to define an allowable deviation range, for example, within the range of ±0.2 dB is considered to have reached. Output the optical power curve graph when the optical power reaches P0 twice, as Figure 5 shown.

[0055] This operation is to eliminate the influence of lost steps caused by idle travel and insufficient lens suction. After this operation, the idle travel has been eliminated, and the collimating lens is also closely attached to the suction nozzle, preparing for the accurate drawing of the optical power curve next.

[0056] S33, calculate the midpoint position where the optical power P0 appears twice. Based on this midpoint position and the displacement of the glue due to UV + baking shrinkage, obtain the final compensation position.

[0057] Specifically, after eliminating the influence of lost steps, continue to move the collimating lens to draw the optical power curve starting and ending with two points where the optical power is P0, as Figure 6 shown. This operation is to find the midpoint of the two positions corresponding to the two points where the optical power is P0 to be at 0 um. Usually, the position of the maximum optical power point does not coincide with the midpoint of the two positions where the optical power is P0. Stopping the final position of the collimating lens at the midpoint of the two positions where the optical power is P0 after baking can make the optical power of the final product more stable.

[0058] After calculating the midpoint position where the optical power P0 appears twice, based on this midpoint position and the displacement of the glue due to UV + baking shrinkage, that is, the target compensation displacement of 0.6 um (about 0.6 um, which needs to be obtained through experiments specifically), finally obtain the final compensation position of the collimating lens before UV as 0 + 0.6 = 0.6 um (that is, the value of the midpoint position + the target compensation displacement). Then, according to the final compensation position, obtain the optical power at the corresponding final compensation position as 0.4 dBm.

[0059] S34, move the collimating lens in the positive Z-axis direction. When the optical power reaches the optical power at the final compensation position for the second time, stop moving, and the compensation operation is completed.

[0060] Specifically, refer to Figure 7, move the collimating lens along the positive Z-axis in steps of 0.1 um. When the optical power reaches 0.4 dBm, which is the optical power at the target compensation position for the second time, stop moving, and the compensation operation is completed. Then, subsequent operations such as turning on the UV lamp to cure the glue can be carried out.

[0061] The collimating lens returns from Figure 7 The optical power corresponding to the position of 0.6 um on the left at P0 is 0.4 dBm. There will also be a point with an optical power of 0.4 dBm in the middle. Therefore, the lens position needs to be stopped at the point where the optical power of 0.4 dBm appears for the second time.

[0062] This solution solves the position compensation deviation caused by the motor's dead zone; it also solves the actual displacement deviation of the lens caused by the adhesive force of the glue. It can make the center of the light spot coming out of the collimating lens and the converging lens coincide with the center of the optical fiber of the fiber optic adapter, minimizing the influence of temperature changes or optical path structure deformation on the optical emission sub-module, and maintaining the optical power stability from the fiber optic adapter to the greatest extent. Ensure that there is no drop in optical power.

[0063] The embodiment of the present invention also provides a collimating lens coupling position compensation system for an optical emission sub-module, which is used to implement the collimating lens coupling position compensation method of the optical emission sub-module, including:

[0064] An installation and fixing module for fixing the laser, isolator, adapter, etc. with glue;

[0065] A coupling module for powering on the laser and coupling the converging lens and the collimating lens;

[0066] A position compensation module for compensating the position of the collimating lens.

[0067] Among them, the method for compensating the lens position is as described above and will not be elaborated here.

[0068] Please refer to Figure 2 which is a schematic diagram of the embodiment of the electronic device provided by the embodiment of the present invention. As Figure 2 shown, the embodiment of the present invention provides an electronic device, including a memory 1310, a processor 1320, and a computer program 1311 stored in the memory 1310 and executable on the processor 1320. When the processor 1320 executes the computer program 1311, the following steps are implemented: S1, fixing the laser, isolator, adapter, etc. with glue;

[0069] S2, powering on the laser and coupling the converging lens and the collimating lens;

[0070] S3, compensating the position of the collimating lens.

[0071] Please refer to Figure 3 which is a schematic diagram of an embodiment of a computer-readable storage medium provided by the present invention. As Figure 3 shown, this embodiment provides a computer-readable storage medium 1400, on which a computer program 1411 is stored. When the computer program 1411 is executed by a processor, the following steps are implemented: S1, fixing a laser, an isolator, an adapter, etc. with glue;

[0072] S2, powering on the laser and coupling a converging lens and a collimating lens;

[0073] S3, compensating for the position of the collimating lens.

[0074] It should be noted that in the above embodiments, the descriptions of each embodiment have their own emphases. For the parts not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0075] Those skilled in the art should understand that the embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memories, CD-ROMs, optical memories, etc.) containing computer-usable program code.

[0076] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to the embodiments of the present invention. It should be understood that each flow and / or block in the flowchart and / or block diagram can be implemented by computer program instructions, and the combination of the flows and / or blocks in the flowchart and / or block diagram can also be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded computer, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate a device for implementing the specified functions in one Figure 1 one or more flows and / or blocks Figure 1 one or more blocks.

[0077] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured article including an instruction device, and the instruction device implements the specified functions in one Figure 1 one or more flows and / or blocks Figure 1 one or more blocks.

[0078] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus, so that a series of operation steps are executed on the computer or other programmable apparatus to produce a computer-implemented process, thereby providing instructions for implementing the processes Figure 1 one process or a plurality of processes and / or blocks Figure 1 steps for the functions specified in one block or a plurality of blocks.

[0079] Although the preferred embodiments of the present invention have been described, additional changes and modifications can be made by those skilled in the art once they learn the basic inventive concept. Therefore, the appended claims are intended to be construed to cover the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0080] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. A method for compensating the collimating lens coupling position of an optical emission sub-module, characterized in that It includes the following steps: S1, fix the laser, isolator, adapter, etc. with glue; S2, power on the laser and couple the focusing lens and collimating lens; S3, compensate for the position of the collimating lens; The specific content of S3 includes: S31, first repeatedly adjust the position of the collimating lens in the X-axis, Y-axis, and Z-axis directions to make the optical power value meet the target optical power specification range; S32, move the collimating lens in the Z-axis direction, and record the positions where the optical power reaches P0 twice; S33, calculate the midpoint position where the optical power P0 appears twice, and based on this midpoint position and the displacement amount of glue UV + baking shrinkage, obtain the final compensation position; S34, move the collimating lens in the Z-axis direction. When the optical power reaches the optical power value corresponding to the final compensation position for the second time, stop moving, and the compensation operation is completed.

2. The collimation lens coupling position compensation method for the optical emission sub-module according to claim 1, characterized in that The specific content of S31 includes: S311, adjust the position of the collimating lens in the Y-axis and Z-axis directions to make the optical power coming out of the fiber adapter reach the maximum; S312, compare whether the optical power is within the target optical power specification range. If it is within the specification range, continue to the next step. If it is not within the specification range, then adjust the position of the collimating lens in the X-axis direction to make the optical power reach the target optical power specification range; S313, then adjust the position of the collimating lens in the Y-axis and Z-axis directions to make the optical power coming out of the fiber adapter reach the maximum; S314, repeat steps S311 to S313 until the optical power coming out of the fiber adapter is within the target optical power specification range.

3. The collimation lens coupling position compensation method for the optical emission sub-module according to claim 1, characterized in that The specific content of S32 includes: First, move 1 - 2um in the positive Z-axis direction with a step of 0.1, then move 0.1 - 1um in the negative Z-axis direction with a step of 0.1, and finally ensure that the total displacement in the positive Z-axis direction is greater than 0.5um, and record the optical power value P0 at this time; Continue to move in the negative Z-axis direction with a step of 0.1um until the optical power value reaches the recorded optical power value P0 again, and output the optical power curve graph where the optical power reaches P0 twice.

4. The collimation lens coupling position compensation method for the optical emission sub-module according to claim 3, characterized in that The specific content of S33 includes: After calculating the midpoint position where the optical power P0 appears twice, based on this midpoint position and the displacement amount of glue UV + baking shrinkage, that is, the glue shrinkage compensation amount, finally obtain the final compensation position before UV of the collimating lens as the midpoint position where the optical power P0 appears twice plus the glue shrinkage compensation amount, and then obtain the optical power corresponding to the final compensation position according to the final compensation position before UV of the collimating lens.

5. The collimation lens coupling position compensation method for the optical emission sub-module according to claim 3, characterized in that, The specific content of S34 includes: Make the collimating lens continue to move in the positive Z-axis direction with a step of 0.1um. When the optical power reaches the optical power of the final compensation position for the second time, stop moving, and the compensation operation is completed.

6. The collimation lens coupling position compensation method for the optical emission sub-module according to claim 1, wherein The specific content of S2 includes: Fix the position of the focusing lens in the X-axis direction, adjust the position of the focusing lens in the Y-axis and Z-axis directions, monitor the optical power coming out of the fiber adapter and make the optical power reach the maximum, then apply UV glue for UV curing to fix the focusing lens, and then bake to further cure the glue under the focusing lens; Power on the laser, adjust the positions of the collimating lens in the X-axis, Y-axis, and Z-axis directions to maximize the light output from the fiber optic adapter. Then, defocus the light along the X-axis towards the laser side to attenuate the optical power. After the optical power reaches the specified range of the target optical power, adjust the positions of the Y-axis and Z-axis to maximize the optical power. Then, repeat the defocusing + adjusting the positions of the Y-axis and Z-axis. If the optical power reaches the specified range of the target optical power required for coupling after the last adjustment of the positions of the Y-axis and Z-axis, stop the coupling.

7. A collimating lens coupling position compensation system for an optical emission sub-module, characterized in that, The system is used to implement the collimating lens coupling position compensation method for the optical emission sub-module as described in any one of claims 1-6, and includes: A mounting and fixing module for fixing the laser, isolator, adapter, etc. with glue; A coupling module for powering on the laser and coupling the converging lens and the collimating lens; A position compensation module for compensating the position of the collimating lens.

8. An electronic device, characterized in that, It includes a memory and a processor. When the processor executes the computer management program stored in the memory, it realizes the steps of the collimating lens coupling position compensation method for the optical emission sub-module as described in any one of claims 1-6.

9. A computer-readable storage medium, characterized in that, A computer management program is stored thereon. When the computer management program is executed by the processor, it realizes the steps of the collimating lens coupling position compensation method for the optical emission sub-module as described in any one of claims 1-6.

Images