CN111122120B - Adjusting device and method for fast and efficient coupling of space light - Google Patents
Adjusting device and method for fast and efficient coupling of space light Download PDFInfo
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- CN111122120B CN111122120B CN201911424874.9A CN201911424874A CN111122120B CN 111122120 B CN111122120 B CN 111122120B CN 201911424874 A CN201911424874 A CN 201911424874A CN 111122120 B CN111122120 B CN 111122120B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/32—Optical coupling means having lens focusing means positioned between opposed fibre ends
Abstract
The application provides a device and a method for adjusting space light coupling quickly and efficiently, and relates to the technical field of photoelectric detection and optical communication equipment. The light source is arranged on the adjusting platform, and the collimating lens is arranged on a light path of emergent light of the light source; the beam splitter can divide the light collimated by the collimating lens into a first beam of light and a second beam of light; the first focusing lens can focus the first beam of light and transmit the first beam of light to one end of the single-mode fiber, the other end of the single-mode fiber is connected with the optical fiber branching unit, and the efficiency of spatial light coupling to the single-mode fiber can be calculated through the optical fiber branching unit; the second focusing lens is arranged on the light path of the second beam of light; the imaging device is used for imaging the focused second beam of light; the controller can control the adjusting platform to adjust the space position and the emission angle of the light source according to the imaging information transmitted by the imaging device and the power information transmitted by the optical power meter, so that the space light source can be automatically adjusted and efficiently coupled to the single-mode optical fiber, and the adjusting time of the space light coupled to the single-mode optical fiber is saved.
Description
Technical Field
The present application relates to the field of photoelectric detection and optical communication device technologies, and in particular, to a device and a method for adjusting spatial light coupling quickly and efficiently.
Background
At present, the photoelectric technology is widely applied, high requirements are put forward on the space transmission of light beams, and the single-mode optical fiber transmission is widely applied due to the characteristics of strong anti-interference performance, high safety and unchanged space mode.
The existing general technology for coupling space light beams to a single-mode optical fiber is to collimate divergent light output by a light source by using a collimating lens, then focus the collimated light to the end face of the optical fiber by using a high-power microscope objective, ensure that a light space mode converted by the lens is matched with a single-mode optical fiber space mode, and obtain higher coupling efficiency.
However, in the prior art, when a light source is tested or applied by related light, each coupling needs to be manually adjusted due to the influence of mechanical motion, a light source installation process, insurmountable environmental vibration and thermal noise, and the manual adjustment precision is low and the adjustment efficiency is low. Therefore, a fast and efficient adjusting device and method for spatial light coupling is urgently needed.
Disclosure of Invention
An object of the present application is to provide a device and a method for adjusting spatial light coupling quickly and efficiently, which can solve the technical problems of manual adjustment and low adjustment efficiency in the prior art.
In order to achieve the above purpose, the technical solutions adopted in the embodiments of the present application are as follows:
in a first aspect, an embodiment of the present application provides a device for adjusting spatial light coupling rapidly and efficiently, including: the device comprises an adjusting platform, a light source, a collimating lens, a beam splitter, a first focusing lens, a second focusing lens, a single-mode optical fiber, an optical fiber splitter, an optical power meter, a controller and imaging equipment.
The light source is arranged on the adjusting platform, and the collimating lens is arranged on a light path of emergent light of the light source; the beam splitter is arranged on a light path of the light collimated by the collimating lens and is used for splitting the received light into a first beam of light and a second beam of light which are transmitted vertically according to a preset proportion; the first focusing lens is arranged on the light path of the first beam of light and is used for focusing the first beam of light and transmitting the first beam of light to the incident end face at one end of the single-mode optical fiber;
the other end of the single-mode fiber is connected with a fiber splitter, the fiber splitter is used for dividing the first beam of light into two paths according to a preset power proportion, wherein one path with lower output power is used for power detection of the optical power meter, and the other path with higher power is used for fiber communication; the second focusing lens is arranged on the light path of the second beam of light and is used for focusing the second beam of light and then transmitting the second beam of light to the imaging equipment; the imaging device is used for imaging the light source of the second beam of light; the optical power meter, the imaging device and the adjusting platform are respectively electrically connected with the controller, and the controller is used for controlling the adjusting platform to adjust the spatial position and the emission angle of the light source according to the imaging information transmitted by the imaging device and the power information transmitted by the optical power meter, wherein the imaging information comprises the imaging position and the focusing degree of the second beam of light in the imaging device.
Optionally, the apparatus further comprises: an optical isolator; the optical isolator is arranged between the collimating lens and the beam splitter and used for isolating a reflected beam of a light path after the collimating lens collimates.
Optionally, the adjusting platform comprises at least 1 adjusting shaft, and the adjusting direction controlled by each adjusting shaft is different.
Optionally, the light source is a laser light source.
In a second aspect, an embodiment of the present application provides a method for adjusting spatial light coupling quickly and efficiently, which is applied to the controller in the first aspect, and the method includes: receiving imaging information transmitted by the imaging device and power information transmitted by the optical power meter, wherein the imaging information comprises an imaging position and a focusing degree of the second beam of light in the imaging device; generating an adjusting instruction according to the power information, the imaging position, a preset reference position, the focusing degree and the preset focusing degree, wherein the preset reference position is a position meeting a preset light power value, and the adjusting instruction is used for controlling an adjusting platform to adjust the space position and the emission angle of a light source; and sending an adjusting instruction to the adjusting platform.
Optionally, the adjusting platform includes at least 1 adjusting shaft, and the adjusting instruction includes an adjusting displacement of each adjusting shaft, where an adjusting direction controlled by each adjusting shaft is different.
Optionally, the generating an adjustment instruction according to the power information, the imaging position, the preset reference position, the focusing degree, and the preset focusing degree includes: and if the adjusting platform is determined to be adjusted according to the power information, generating an adjusting instruction according to the imaging position, the preset reference position, the focusing degree and the preset focusing degree.
Optionally, the generating an adjustment instruction according to the imaging position, the preset reference position, the focusing degree, and the preset focusing degree includes: acquiring coordinate deviation according to the coordinates of the imaged light spot at the imaging position and the coordinates of a preset reference position; determining an adjusting parameter of an adjusting shaft according to the focusing degree and a preset focusing degree; and generating an adjusting instruction according to the coordinate deviation and the adjusting parameter of the adjusting shaft.
Optionally, the generating an adjustment instruction according to the coordinate deviation and the adjustment parameter of the adjustment axis includes: generating a first adjusting instruction according to the coordinate deviation, wherein the first adjusting instruction is used for adjusting the spatial position of the light source; and generating a second adjusting instruction according to the adjusting parameter of the adjusting shaft, wherein the second adjusting instruction is used for adjusting the emission angle of the light source.
Optionally, the determining, according to the power information, an adjustment platform includes: receiving power information transmitted by an optical power meter; judging whether the power information is smaller than a preset optical power value; and if the value is less than the preset value, determining to adjust the adjusting platform.
The beneficial effect of this application is:
according to the adjusting device and the method for quickly and efficiently coupling the space light, the light source is arranged on the adjusting platform, and the collimating lens is arranged on a light path of emergent light of the light source; the beam splitter is arranged on a light path of the light collimated by the collimating lens and is used for splitting the received light into a first beam of light and a second beam of light which are transmitted vertically according to a preset proportion; the first focusing lens is arranged on a light path of the first beam of light and used for focusing the first beam of light and transmitting the first beam of light to an incident end face at one end of the single-mode fiber, the other end of the single-mode fiber is connected with the optical fiber branching unit, the optical fiber branching unit is used for dividing the first beam of light into two paths according to a preset power proportion, wherein one path with lower output power is used for power detection of the optical power meter, and the other path with higher power is used for optical fiber communication; the second focusing lens is arranged on the light path of the second beam of light and is used for focusing the second beam of light and then transmitting the second beam of light to the imaging equipment; the imaging device is used for imaging the light source of the second beam of light; the optical power meter, the imaging device and the adjusting platform are respectively electrically connected with the controller, the controller is used for controlling the adjusting platform to adjust the angle of the light source to adjust the space position of the light source and the angle of emergent light according to imaging information transmitted by the imaging device and power information transmitted by the optical power meter, automatic adjustment of the space light source and efficient coupling to the single-mode optical fiber are achieved, and adjusting time of the space light coupled to the single-mode optical fiber is greatly saved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a schematic structural diagram of a spatial light fast and efficient coupling adjustment device provided in an embodiment of the present application;
fig. 2 is a schematic structural diagram of another adjusting apparatus for fast and efficient coupling of spatial light according to an embodiment of the present application;
fig. 3 is a schematic flowchart of a method for adjusting the fast and efficient coupling of spatial light according to an embodiment of the present disclosure;
fig. 4 is a schematic flowchart of another method for adjusting the fast and efficient coupling of spatial light according to an embodiment of the present disclosure;
fig. 5 is a schematic flowchart of another method for adjusting the rapid and efficient coupling of spatial light according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Icon: 110-a conditioning stage; 130-a light source; 140-a collimating lens; 150-a beam splitter; 160-a first focusing lens; 170-a second focusing lens; 180-single mode fiber; 190-optical power meter; 200-an optical splitter; 210-a controller; 220-an imaging device; 230-optical isolator.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
Fig. 1 is a schematic structural diagram of a spatial light fast and efficient coupling adjustment device according to an embodiment of the present disclosure. As shown in fig. 1, the apparatus includes: adjustment stage 110, light source 130, collimating lens 140, beam splitter 150, first focusing lens 160, second focusing lens 170, single mode fiber 180, optical power meter 190, fiber splitter 200, controller 210, and imaging device 220.
The Light source 130 is disposed on the adjusting platform, and the Light source may be a laser emitted by a laser, or may be other Light sources 130, such as a Light Emitting Diode (LED), and the like, which is not limited herein; the adjusting platform 110 may adjust an angle of light emitted from the light source 130, and optionally, the adjusting platform 110 may be a three-axis electric adjusting platform, a four-axis electric adjusting platform, a five-axis electric adjusting platform, or the like, which is not limited herein.
The collimating lens 140 is disposed on a light path of light emitted from the light source 130, and can collimate the light emitted from the light source 130, and the collimated light becomes a parallel collimated light beam and is output to the beam splitter 150.
The beam splitter 150 is disposed on the light path of the light collimated by the collimating lens 140, and is configured to split the received light into a first light beam and a second light beam that are vertically transmitted according to a preset ratio, and a small portion of the second light beam may be reflected by the beam splitter 150 to serve as a monitoring light path. Optionally, the first beam of light may be perpendicular to the second beam of light, and the first beam of light may account for 5% to 10% of the collimated light beam.
The first focusing lens 160 is disposed on a light path of the first beam of light, and is configured to focus the first beam of light and transmit the first beam of light to an incident end face of one end of the single-mode fiber 180, a light spot may be formed on an end face of the single-mode fiber 180, the other end of the single-mode fiber 180 is connected to the optical splitter 200, the optical splitter 200 is configured to divide the first beam of light into two paths according to a preset power ratio, where one path with lower output power is used for power detection by the optical power meter 190, and the relative loss information of the optical power of the first beam of light passing through the single-mode fiber 180 can be measured by the optical power meter 190, so as to reflect the coupling efficiency of the first beam of light output by the free space to the single-mode fiber 180, and the other path with higher power is used for fiber communication. Optionally, the output power of the first light beam may be 5% to 10% of the output power of the second light beam, which is not limited herein and may be set by itself according to the actual application.
The second focusing lens 170 is disposed on a light path of the second beam of light, and is configured to focus the second beam of light and transmit the second beam of light to the imaging device 220, and the imaging device 220 is configured to image a light source of the second beam of light, and may form a corresponding light spot on an imaging surface of the imaging device 220 after imaging. The imaging device 220 may be a Complementary Metal-Oxide-Semiconductor (CMOS) camera, but is not limited thereto.
It should be noted that the first focusing lens 160 and the second focusing lens 170 may have end-face focusing and imaging characteristics, and may be the same or different, and the present application is not limited thereto. Optionally, a 10X optical magnification system may be formed via the second focusing lens 170 to image the light source into the imaging device 220. After the light collimated by the collimating lens 140 passes through the beam splitter 150, the light spot of the first beam of light falling on the end surface of the single-mode fiber 180 and the light spot of the second beam of light falling on the imaging surface of the imaging device 220 may be in a conjugate state.
The optical power meter 190, the imaging device 220, and the adjusting platform 110 are electrically connected to the controller 210, respectively, and the controller 210 is configured to control the adjusting platform 110 to adjust the spatial position of the light source 130 and the angle of the outgoing light by adjusting the angle of the light source 130 according to the imaging information transmitted by the imaging device 220 and the power information transmitted by the optical power meter 190, where the imaging information includes the imaging position and the focusing degree of the second beam of light in the imaging device 220.
The controller 210 may determine whether the current power information satisfies a preset optical power value according to the power information transmitted by the optical power meter 190, and further determine whether to adjust the spatial position and the angle of the light source 130 to adjust the angle of the light emitted from the light source 130; and how to adjust, for example, to which direction to adjust, and adjust displacement, angle of adjustment etc. can be known to controller 210 according to the imaging information that imaging device 220 transmitted, and then control and adjust platform 110 through the angle of adjusting the spatial position of light source 130 and the emergent light, realize automatically regulated, improve regulation efficiency for the final light power value after adjusting can satisfy and predetermine light power value, obtains higher coupling efficiency.
In summary, in the adjusting device for fast and efficient coupling of spatial light provided in the embodiment of the present application, the light source is disposed on the adjusting platform, and the collimating lens is disposed on the light path of the emergent light of the light source; the beam splitter is arranged on a light path of the light collimated by the collimating lens and is used for splitting the received light into a first beam of light and a second beam of light which are transmitted vertically according to a preset proportion; the first focusing lens is arranged on a light path of the first beam of light and used for focusing the first beam of light and transmitting the first beam of light to an incident end face at one end of the single-mode fiber, the other end of the single-mode fiber is connected with the optical fiber branching unit, the optical fiber branching unit is used for dividing the first beam of light into two paths according to a preset power proportion, wherein one path with lower output power is used for power detection of the optical power meter, and the other path with higher power is used for optical fiber communication; the second focusing lens is arranged on the light path of the second beam of light and is used for focusing the second beam of light and then transmitting the second beam of light to the imaging equipment; the imaging device is used for imaging the light source of the second beam of light; the optical power meter, the imaging device and the adjusting platform are respectively electrically connected with the controller, the controller is used for controlling the adjusting platform to adjust the light source angle to adjust the spatial position and the emergent light angle of the light source according to the imaging information transmitted by the imaging device and the power information transmitted by the optical power meter, automatic adjustment of the spatial light source and efficient coupling to the single-mode optical fiber are achieved, and adjusting time of the spatial light coupled to the single-mode optical fiber is greatly saved.
Fig. 2 is a schematic structural diagram of another adjusting apparatus for fast and efficient coupling of spatial light according to an embodiment of the present application. Optionally, as shown in fig. 2, the apparatus further includes: an optical isolator 230; the optical isolator 230 is disposed between the collimating lens 140 and the beam splitter 150, and is used for isolating the reflected light beam on the optical path after being collimated by the collimating lens 140, and protecting the light source from being affected and damaged.
The optical isolator 230 is a passive device that allows light to pass through in one direction and prevents light from passing through in the opposite direction, and functions to limit the direction of light, so that light can only be transmitted in a single direction, and light transmitted in the single direction can be well isolated by the optical isolator 230, thereby playing a role in protecting a light source. Therefore, in the present application, the optical isolator 230 can perform unidirectional transmission on the light collimated by the collimating lens 140, and the optical coupling efficiency of the adjusting device for fast and efficient coupling of the spatial light can be improved.
Optionally, the adjusting platform 110 includes at least 1 adjusting shaft, and the adjusting direction controlled by each adjusting shaft is different.
According to an actual application scenario, the adjusting platform 110 may include a plurality of adjusting axes, for example, 2, 3, 5, etc., the application is not limited herein, and the adjusting axes may adjust the spatial position and the emission angle of the light source 130 in a plurality of adjusting directions, so as to adjust the angle of the light emitted from the light source 130.
Optionally, the application is described herein with a five-axis adjusting platform as an example, the five-axis adjusting platform may include a first axis (X axis), a second axis (Y axis), a third axis (Z axis), a fourth axis (TX axis), and a fifth axis (TY axis), where the X axis may be an adjusting axis in a horizontal direction, the Y axis may be an adjusting axis in a vertical direction, the Z axis may be an adjusting axis parallel to the first beam of light transmission direction, the TX axis may be a rotating axis around the X axis, and the TY axis may be a rotating axis around the Y axis.
Optionally, the light source 130 is a laser light source or a similar laser light source, for example, optionally, the laser light source may be obtained by a semiconductor laser, and of course, specific parameters, models, and the like of the laser are not limited herein, and may be selected accordingly according to an actual application scenario.
Fig. 3 is a schematic flowchart of a method for adjusting the fast and efficient coupling of spatial light according to an embodiment of the present disclosure. The method may be applied to the controller described above, as shown in fig. 3, and includes:
and S101, receiving imaging information transmitted by the imaging device and power information transmitted by the optical power meter, wherein the imaging information comprises an imaging position and a focusing degree of the second light in the imaging device.
Optionally, the imaging information may include an imaging position, a focusing degree, and the like of a spot imaged on the imaging surface by the second beam of light, where the imaging position may include a center coordinate of the imaging spot, and the focusing degree of the current spot may be obtained from the imaged spot image, for example, a spot focusing value of the current spot may be obtained according to a pixel value of the spot image, but not limited thereto.
As described in the above embodiment, the other end of the single-mode fiber is connected to an optical splitter, and the optical splitter is configured to split the first beam of light into two paths according to a preset power ratio, where one path with a lower output power is used for power detection by an optical power meter, and the optical power meter can measure and calculate power information of the beam with the lower output power, and further can calculate power information of the first beam of light passing through the single-mode fiber according to the preset power ratio, and send the measured power information to the controller. The optical power information may reflect the relative loss information of the optical power and the coupling efficiency of the first beam of light output from the free space into the single mode fiber.
S102, generating an adjusting instruction according to the power information, the imaging position, the preset reference position, the focusing degree and the preset focusing degree, wherein the preset reference position is a position meeting a preset light power value, and the adjusting instruction is used for controlling an adjusting platform to adjust the space position and the emission angle of the light source.
Optionally, the controller may determine whether the current power information satisfies a preset optical power value according to the received power information, and may further determine whether to adjust the spatial position and the emission angle of the light source; if the adjustment is needed, the controller can generate an adjustment instruction according to the imaging position, the preset reference position, the focusing degree and the preset focusing degree so as to adjust the spatial position and the emission angle of the light source. Alternatively, the preset reference position may include a preset reference spatial position, and specifically, when adjusting, it may be known how to adjust, for example, to which direction the spatial position of the light source is to be adjusted, how much the displacement is to be adjusted, and after determining how to adjust, a corresponding adjustment instruction may be generated.
And S103, sending an adjusting instruction to the adjusting platform.
After the adjusting instruction is generated, the adjusting instruction can be sent to the adjusting platform, so that the adjusting platform can adjust the spatial position and the emission angle of the light source according to the adjusting instruction, automatic adjustment is realized, the adjusting efficiency is improved, the finally adjusted light power value can meet the preset light power value, and higher coupling efficiency is obtained.
To sum up, in the adjusting method for fast and efficient coupling of spatial light provided in the embodiment of the present application, an adjusting instruction is generated by receiving imaging information transmitted by an imaging device and power information transmitted by an optical power meter and according to the power information, an imaging position, a preset reference position, a focusing degree and a preset focusing degree, and after the adjusting instruction is generated, the adjusting instruction can be sent to an adjusting platform, so that the adjusting platform can adjust a spatial position and an emission angle of a light source according to the adjusting instruction, thereby realizing automatic adjustment and efficient coupling of the spatial light source to a single-mode fiber, and saving adjusting time for coupling the spatial light to the single-mode fiber.
Optionally, the number of the adjusting platform including the adjusting shafts is at least 1, and the adjusting instruction includes an adjusting displacement of each adjusting shaft, where an adjusting direction controlled by each adjusting shaft is different, and the content of this part may be referred to related description of the method part, which is not described herein again.
Optionally, the generating an adjustment instruction according to the power information, the imaging position, the preset reference position, the focusing degree, and the preset focusing degree includes: and if the adjusting platform is determined to be adjusted according to the power information, generating an adjusting instruction according to the imaging position, the preset reference position, the focusing degree and the preset focusing degree.
Optionally, if the optical power value corresponding to the power information is smaller than a preset optical power value, it may be determined that the adjustment platform needs to be adjusted, and then a corresponding adjustment instruction is generated according to the imaging position, the preset reference position, the focusing degree, and the preset focusing degree.
Fig. 4 is a schematic flowchart of another method for adjusting the fast and efficient coupling of spatial light according to an embodiment of the present disclosure. Optionally, as shown in fig. 4, the generating an adjustment instruction according to the imaging position, the preset reference position, the focusing degree, and the preset focusing degree includes:
s201, obtaining coordinate deviation according to the coordinates of the imaging light spot at the imaging position and the coordinates of a preset reference position.
S202, determining an adjusting parameter of the adjusting shaft according to the focusing degree and the preset focusing degree.
And S203, generating an adjusting instruction according to the coordinate deviation and the adjusting parameters of the adjusting shaft.
The coordinate deviation between the coordinates of the imaging light spot at the imaging position and the coordinates of the preset reference position can be obtained, and the adjusting instruction can be generated according to the coordinate deviation and can be used for adjusting the coordinates of the imaging light spot at the current imaging position to the coordinates of the preset reference position.
It should be noted that the determination of the preset reference position may be determined by using a preset standard light source, that is, the preset standard light source is used as a light source in the apparatus, and the angle of the preset standard light source may be adjusted to enable the light power value to meet the preset light power value at a certain angle, so that the imaging position of the preset standard light source in the imaging device may be used as the preset reference position. It should be noted that, the specific value of the preset optical power value is not limited in the present application, and corresponding setting may be performed according to an actual application scenario, so that when the coordinate of the light spot imaged by the light source to be measured is adjusted, the coordinate may be adjusted by referring to a preset reference position, thereby satisfying the preset optical power value and obtaining a higher optical coupling efficiency. Of course, it should be noted that the preset standard light source and the light source to be measured may be light sources with similar light source parameters.
Optionally, when the preset reference position is determined by using a preset standard light source, the preset standard light source may be used to initially calibrate the adjusting device for fast and efficient coupling of the spatial light. For example, the imaging device is a CMOS camera, the position of the CMOS camera can be adjusted so that the second beam of light split by the beam splitter is exactly focused on the photosensitive surface of the CMOS camera, and the center of the light spot is exactly positioned at the center of the field of view of the CMOS camera, at this time, the two beams of light passing through the beam splitter fall on the light spot on the end surface of the single mode fiber and the light spot on the end surface of the CMOS camera are in a conjugate state, and after the adjustment is completed, the second focusing lens and the CMOS camera are fixed, and then the initial calibration can be completed.
Fig. 5 is a schematic flowchart of another method for adjusting the fast and efficient coupling of spatial light according to an embodiment of the present disclosure. Alternatively, as shown in fig. 5, the generating an adjustment instruction according to the coordinate deviation and the adjustment parameter of the adjustment axis includes:
s301, generating a first adjusting instruction according to the coordinate deviation, wherein the first adjusting instruction is used for adjusting the space position of the light source.
The first adjustment instruction may include an adjustment direction and an adjustment size for adjusting the spatial position of the light source, and it should be noted that, if the adjustment shafts used for adjusting the spatial position of the light source on the adjustment platform include a plurality of adjustment shafts, the adjustment direction and the adjustment size of each adjustment shaft need to be determined, and then the adjustment instruction corresponding to each adjustment shaft is generated according to the adjustment direction and the adjustment size of each adjustment shaft. For example, when the adjusting platform includes the two adjusting axes of the X axis and the Y axis, the adjusting instructions corresponding to the X axis and the Y axis may be generated respectively, so that after the adjustment according to the adjusting instructions, the coordinates of the imaging light spot at the current imaging position are adjusted to the coordinates of the preset reference position.
S302, generating a second adjusting instruction according to the adjusting parameter of the adjusting shaft, wherein the second adjusting instruction is used for adjusting the emission angle of the light source.
The second adjustment instruction may include an adjustment direction and an adjustment size for adjusting the emission angle of the light source, and optionally, after the spatial position of the light source is adjusted by the first adjustment instruction, the emission angle of the light source is adjusted by the second adjustment instruction.
For example, when the adjusting platform includes a plurality of adjusting axes (such as the Z axis, TX axis, and TY axis), adjusting instructions corresponding to the adjusting axes (such as the Z axis, TX axis, and TY axis) may be generated, so that after adjustment according to the adjusting instructions, the spot focus value of the spot imaged at the imaging position may be adjusted to a preset spot focus value, and thus higher coupling efficiency may be obtained at the preset spot focus value.
Optionally, the adjusting platform may be a five-axis electric adjusting platform, the preset standard light source in the adjusting device that is subjected to the rapid and efficient coupling of the corrected space light is replaced with a light source to be measured, and when the light source to be measured is adjusted, reference may be made to the following process:
firstly, searching light spots (aiming at the problem that the initial deflection degree of a light source to be detected is too large, and light beams cannot fall in the field of view of a camera through a beam splitter);
(1) reading a current light spot focusing value according to an imaged light spot at an imaging position (the value is larger and the focusing degree is higher for judging the focusing degree of the light spot), if the light spot focusing value is lower than a set light spot threshold value (for example, 0.1), starting to control a motor to enable the coordinate of the light spot in the camera visual field to move X, Y axes from the upper left corner to the lower right corner, moving a preset moving distance (for example, 0.3mm) each time, reading the light spot focusing value once after moving, judging whether the light spot focusing value is larger than 0.1, if the light spot focusing value is larger than 0.1, ending the step of searching the light spot, and if the light spot focusing value is smaller than 0.1, repeating the current step for preset times (for example, 9 times). If the light spot is not found after the preset times of repetition, returning to the initial position of the motor, and then executing the step (2) of searching the light spot.
(2) And starting to control the motor to enable the light spot to move X, Y axes from the upper right corner to the lower left corner on the coordinate displayed by the camera, moving for a preset moving distance (for example, 0.3mm) each time, reading the light spot focusing value once after moving, judging whether the light spot focusing value is larger than a light spot threshold value (for example, 0.1), if so, ending the step of searching the light spot, and if not, repeating the current step for preset times (for example, 9 times). And if the light spot is not found after the preset times of repetition, returning to the initial position of the motor, and then executing the step (3) of searching the light spot.
(3) And (3) controlling a motor to enable the coordinates displayed by the camera to move X, Y axes from the lower left corner to the upper right corner, referring to the processes of the steps (1) and (2), if the preset times of finding the light spot are repeated, ending the step of searching the light spot, if the light spot is not found, returning to the initial position of the motor, controlling the motor to enable the coordinates displayed by the camera to move X, Y axes from the lower right corner to the upper left corner, and repeating the steps until the light spot is found.
Secondly, centering light spots in the image;
reading the coordinates X and Y of the centroid of the light spot, calculating the pixel difference of the coordinates of the centroid X and the Y from the center point of the preset reference position, optionally multiplying the pixel difference of the centroid X direction by the distance value corresponding to one pixel moved in the motor X direction to obtain the distance moved by the motor X axis, multiplying the pixel difference of the centroid Y direction by the distance value corresponding to one pixel moved in the motor Y direction to obtain the distance moved by the motor Y axis, and generating an adjusting instruction according to the distance moved by the motor X axis and the distance moved by the motor Y axis so as to control the X axis and the Y axis of the adjusting platform to adjust.
Optionally, a slope of the fitting between the coordinates of the centroid X of the light spot and the TX axis may also be obtained, and the angle of the TX axis to be deflected may be calculated according to the intercept of the movement of the centroid X of the light spot of the preset standard light source and the TX axis and the slope of the movement of the centroid X of the light spot of the preset standard light source on the TX axis, for example, the following formula may be used to obtain: the angle of the TX axis needing deflection is (the slope of the coordinate of the centroid X of the current light source spot to be detected and the Z axis, the intercept of the movement of the centroid X of the preset standard light source spot and the TX axis)/the slope of the movement of the centroid X of the preset standard light source spot on the TX axis.
Optionally, a slope of the light spot centroid Y coordinate fitting with the TY axis may also be obtained, and the angle of the TY axis to be deflected is calculated according to an intercept of the movement of the preset standard light source light spot centroid Y with the TY axis and a slope of the movement of the preset standard light source light spot centroid Y with the TY axis, for example, the following formula may be used to obtain: the angle of the TY axis required to deflect is (the slope of the Y coordinate of the centroid of the light source spot to be measured and the Z axis fit-the intercept of the Y coordinate of the centroid of the light source spot to be measured and the TY axis movement)/the slope of the movement of the Y coordinate of the centroid of the light source spot of the standard light source on the TY axis is preset.
It should be noted that the preset intercept between the standard light source light spot centroid X and the TX axis movement, the preset slope between the standard light source light spot centroid X and the TX axis movement, the preset intercept between the standard light source light spot centroid Y and the TY axis movement, and the preset slope between the standard light source light spot centroid Y and the TY axis movement may be calculated by referring to the following process.
(1) Adjusting a TX axis: the TX axes are moved together a first preset number of times (e.g., 10 times), each time by a preset step distance (e.g., 0.5mm), and the focus value of the spot and the current position of the motor are recorded at the current step while moving. And calculating the X-axis position corresponding to the maximum value of the spot focus value in the 10-time moving process and an X-axis position before and after the maximum value of the spot focus value, and performing parabolic fitting operation on the three spot focus values and the three X-axis positions (the X-axis position of the horizontal axis and the X-axis spot focus value of the vertical axis) to obtain the X-axis position corresponding to the maximum value of the spot focus value to which the X-axis needs to be moved, wherein the X-axis position corresponding to the maximum value of the spot focus value in the 10-time moving process is probably not the maximum value of the spot focus value, so the maximum value of the spot focus value at the X-axis position can be obtained in a fitting mode.
(2) Adjusting a TY axis: the TY axis is moved a second preset number of times (e.g., 10 times) in total, each time by a preset step distance (e.g., 0.5mm), and the focus value of the spot at the current step and the current position of the motor are recorded while moving. And calculating the Y-axis position corresponding to the maximum value of the spot focus value in the 10-time moving process and one Y-axis position before and after the maximum value of the spot focus value, and performing parabola fitting operation on the three spot focus values and the three Y-axis positions (the Y-axis position of the horizontal axis and the spot focus value of the vertical axis) to obtain the Y-axis position corresponding to the maximum value of the spot focus value to which the Y-axis needs to be moved. For the reason of the specific fitting, reference may be made to the description of (1) above, and the description of the present application is omitted here.
(3) Adjusting the Z axis: the Z axis moves for a third preset time (for example, 10 times) together, each time the Z axis moves by a preset step distance (for example, 0.04mm), and the current focus value of the light spot, the X and Y coordinates of the centroid of the light spot and the current position of the motor are recorded during the movement. And calculating the Z-axis position corresponding to the maximum value of the spot focus value in the 10-time moving process and one Z-axis position before and after the maximum value of the spot focus value, and performing parabolic fitting operation on the three spot focus values and the three X-axis positions (the Z-axis position of the horizontal axis and the spot focus value of the vertical axis) to obtain the Z-axis position corresponding to the maximum value of the spot focus value to which the Z-axis needs to be moved. For the reason of the specific fitting, reference may be made to the description of (1) above, and the description of the present application is omitted here.
In summary, under the preset standard light source, after the X-axis position corresponding to the maximum value of the spot focusing value that the X-axis needs to move is obtained, the intercept between the preset standard light source spot centroid X and the TX-axis movement and the slope of the preset standard light source spot centroid X moving on the TX-axis can be obtained; after the Y-axis position corresponding to the maximum value of the spot focusing value, which is required to move to, is obtained, the intercept of the movement of the preset standard light source spot centroid Y and the TY axis and the slope of the movement of the preset standard light source spot centroid Y on the TY axis can be obtained. After the Z axis is obtained and needs to move to the Z axis position corresponding to the maximum value of the light spot focusing value, the current Z axis position can be adjusted to the Z axis position corresponding to the maximum value of the light spot focusing value according to the position deviation of the current Z axis position and the Z axis position corresponding to the maximum value of the light spot focusing value, and then the angles of the light source can be adjusted on a TX axis, a TY axis and the Z axis, so that the finally adjusted light power value can meet the preset light power value, and higher coupling efficiency is obtained.
Optionally, the determining, according to the power information, an adjustment platform includes: receiving power information transmitted by an optical power meter; judging whether the power information is smaller than a preset optical power value; and if the value is less than the preset value, determining to adjust the adjusting platform.
Optionally, when the optical power value corresponding to the power information transmitted by the optical power meter is smaller than the preset optical power value, it may be determined to adjust the adjustment platform, but not limited thereto.
Optionally, the preset optical power value may be an optical power value measured under the action of a preset standard light source, and the size of the value is not limited herein and may be different according to the actual application.
These above modules may be one or more integrated circuits configured to implement the above methods, such as: one or more Application Specific Integrated Circuits (ASICs), or one or more microprocessors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs), among others. For another example, when one of the above modules is implemented in the form of a Processing element scheduler code, the Processing element may be a general-purpose processor, such as a Central Processing Unit (CPU) or other processor capable of calling program code. For another example, these modules may be integrated together and implemented in the form of a system-on-a-chip (SOC).
Fig. 6 is a schematic structural diagram of an electronic device according to an embodiment of the present application. As shown in fig. 6, the electronic device may include: a processor 510, a storage medium 520, and a bus 530, the storage medium 520 storing machine-readable instructions executable by the processor 510, the processor 510 communicating with the storage medium 520 via the bus 530 when the electronic device is operating, the processor 510 executing the machine-readable instructions to perform the steps of the above-described method embodiments. The specific implementation and technical effects are similar, and are not described herein again.
Optionally, the present application further provides a storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the computer program performs the steps of the above method embodiments. The specific implementation and technical effects are similar, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) or a processor (processor) to perform some steps of the methods according to the embodiments of the present application. And the aforementioned storage medium includes: a U disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (8)
1. A device for fast and efficient coupling of spatial light, comprising:
the device comprises an adjusting platform, a light source, a collimating lens, a beam splitter, a first focusing lens, a second focusing lens, a single-mode optical fiber, an optical power meter, an optical fiber splitter, a controller and imaging equipment;
the light source is arranged on the adjusting platform, and the collimating lens is arranged on a light path of emergent light of the light source;
the beam splitter is arranged on a light path of the light collimated by the collimating lens and is used for splitting the received light into a first beam of light and a second beam of light which are transmitted vertically according to a preset proportion;
the first focusing lens is arranged on a light path of the first beam of light and is used for focusing the first beam of light and then transmitting the first beam of light to an incident end face at one end of the single-mode optical fiber;
the other end of the single-mode fiber is connected with the fiber splitter, and the fiber splitter is used for dividing the first beam of light into two paths according to a preset power proportion, wherein one path with lower output power is used for power detection of the optical power meter, and the other path with higher power is used for fiber communication;
the second focusing lens is arranged on a light path of the second beam of light and is used for focusing the second beam of light and then transmitting the second beam of light to the imaging equipment;
the imaging device is used for imaging the light source of the second beam of light;
the optical power meter, the imaging device and the adjusting platform are respectively connected with the controller, and the controller is used for controlling the adjusting platform to adjust the spatial position and the emission angle of the light source according to imaging information transmitted by the imaging device and power information transmitted by the optical power meter, wherein the imaging information comprises the imaging position and the focusing degree of the second beam of light in the imaging device; the adjusting platform comprises at least 1 adjusting shaft;
the controller is specifically configured to, if the adjustment platform is determined to be adjusted according to the power information, obtain a coordinate deviation according to a coordinate of an imaged light spot at the imaging position and a coordinate of a preset reference position, where the preset reference position is an imaging position of a preset standard light source in the imaging device when a preset light power value is met;
determining an adjusting parameter of the adjusting shaft according to the focusing degree and a preset focusing degree;
and generating an adjusting instruction according to the coordinate deviation and the adjusting parameter of the adjusting shaft, wherein the adjusting instruction is used for controlling the adjusting platform to adjust the space position and the emission angle of the light source.
2. The apparatus of claim 1, further comprising: an optical isolator;
the optical isolator is arranged between the collimating lens and the beam splitter and used for isolating a reflected beam of the light path after the collimating lens collimates.
3. The device of claim 1, wherein each of the adjustment axes controls a different direction of adjustment.
4. The apparatus of claim 1, wherein the light source is a laser light source.
5. A method for adjusting the fast and efficient coupling of spatial light, applied to the controller of any one of claims 1-4, the method comprising:
receiving imaging information transmitted by the imaging device and power information transmitted by the optical power meter, wherein the imaging information comprises an imaging position and a focusing degree of the second beam of light in the imaging device;
generating an adjusting instruction according to the power information, the imaging position, a preset reference position, the focusing degree and a preset focusing degree, wherein the preset reference position is the imaging position of a preset standard light source in imaging equipment when a preset light power value is met, and the adjusting instruction is used for controlling the adjusting platform to adjust the space position and the emission angle of the light source;
sending the adjusting instruction to the adjusting platform;
the adjusting platform comprises at least 1 adjusting shaft;
generating an adjusting instruction according to the power information, the imaging position, a preset reference position, the focusing degree and a preset focusing degree, including:
if the adjusting platform is determined to be adjusted according to the power information, acquiring coordinate deviation according to the coordinates of the imaged light spot at the imaging position and the coordinates of the preset reference position;
determining an adjusting parameter of the adjusting shaft according to the focusing degree and a preset focusing degree;
and generating an adjusting instruction according to the coordinate deviation and the adjusting parameter of the adjusting shaft.
6. The method of claim 5, wherein the adjustment command comprises an adjustment displacement of each of the adjustment axes, wherein each of the adjustment axes controls a different adjustment direction.
7. The method of claim 6, wherein generating an adjustment command based on the coordinate deviation and an adjustment parameter of the adjustment axis comprises:
generating a first adjusting instruction according to the coordinate deviation, wherein the first adjusting instruction is used for adjusting the spatial position of the light source;
and generating a second adjusting instruction according to the adjusting parameter of the adjusting shaft, wherein the second adjusting instruction is used for adjusting the emission angle of the light source.
8. The method of claim 6, wherein determining to adjust the adjustment stage based on the power information comprises:
receiving power information transmitted by the optical power meter;
judging whether the power information is smaller than a preset optical power value or not;
and if the value is less than the preset value, determining to adjust the adjusting platform.
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| CN113049227B (en) * | 2021-03-15 | 2024-04-02 | 深圳市杰普特光电股份有限公司 | Laser wavelength modulation measuring device, measuring method and measuring system thereof |
| CN113092075B (en) * | 2021-04-09 | 2022-08-23 | 中国科学院光电技术研究所 | Variable-angle high-precision calibration light source system |
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