CN111650695A - Space light-optical fiber coupling alignment method for optical fiber transmission characteristic measurement - Google Patents
Space light-optical fiber coupling alignment method for optical fiber transmission characteristic measurement Download PDFInfo
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- 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
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Abstract
The invention belongs to the technical field of optical fiber coupling, and particularly relates to a space light-optical fiber coupling alignment method for measuring optical fiber transmission characteristics. The coupling alignment system adopted by the optical fiber coupling automatic alignment method is divided into three subsystems: the axial alignment system, the radial alignment system and the angle alignment system automatically eliminate axial deviation, radial deviation and angle deviation in sequence to realize automatic alignment of optical fiber coupling. Under the condition of considering various coupling deviations, the invention adopts a machine vision method to process images to determine the position, and simultaneously feeds back the position parameters to the control system to carry out the automatic alignment of optical fiber coupling, thereby ensuring the alignment precision, improving the optical fiber coupling efficiency, eliminating the influence caused by the coupling focusing ratio degradation of the incident beam and the optical fiber, and being beneficial to the performance tests of the optical fiber such as the focusing ratio degradation, the transmissivity and the like.
Description
Technical Field
The invention belongs to the technical field of optical fiber coupling, and particularly relates to a space light-optical fiber coupling alignment method for measuring optical fiber transmission characteristics.
Background
In optical fiber applications, parameters such as transmittance and coupling efficiency of an optical fiber are very important, and there are various optical fiber parameter measuring apparatuses and methods. For example, in the field of astronomy, the transmission performance of an optical fiber has a significant effect on the observation efficiency of an astronomical telescope, the overall transmission efficiency (the optical fiber output optical power P including the coupling efficiency)outAnd the optical power P of the input endinThe ratio of the incident light to the emergent light) and the focal ratio degradation characteristic (the phenomenon that the emergent light angle of the optical fiber is larger than the incident light angle, namely the emergent focal ratio is smaller than the incident focal ratio) are two important parameters for evaluating the quality of the astronomical optical fiber system. The optical fiber has low coupling efficiency and large transmission loss, the signal-to-noise ratio of the obtained optical signal is reduced, and the focal ratio degradation not only affects the energy utilization rate of the spectrometer, but also affects the point spread function of the emergent optical field of the optical fiber.
Factors affecting the focal ratio degradation of the fiber are as follows: bending of the fiber, scattering, core diameter variation, mishandling of the fiber end face, and misalignment of the incident light coupling fiber, among others. In which the optical fiber coupling misalignment can cause the focal ratio degradation to be more severe, therefore, in order to measure the more true and accurate focal ratio degradation, the coupling alignment of the optical fiber is required before the test. The mechanism by which the fiber coupling misalignment condition affects the fiber focal ratio degradation is as follows: incident light beams with different apertures and corresponding to different focal ratios can enter the optical fiber after being focused and coupled by the lens, but the fiber core of the optical fiber is very thin, so that the focused light spots are very difficult to align with the fiber core, and the requirement on the adjustment precision is very high. The above causes three types of deviation in the optical fiber coupling process: axial, radial and angular deviations. The transmittance measurement of the optical fiber comprises factors such as the coupling efficiency and transmission loss of the incident light of the optical fiber, and the existence of the three deviations can cause the coupling efficiency of the optical fiber to be greatly reduced, thereby influencing the measurement of the transmittance of the optical fiber. Radial deviation and angle deviation cause that incident light is not ideal coaxial irradiation when irradiating the input end of the optical fiber, transfer between modes occurs, energy loss is caused, emergent light spots of the optical fiber become large, the phenomenon of focal ratio degradation is serious, system errors are added to a focal ratio test system, and the measurement result of the focal ratio is influenced.
The patent CN107727371A discloses a system and a method for simultaneously measuring the transmittance and the focal ratio degradation of an astronomical optical fiber, and the patent CN110261065A discloses an automatic measuring system for the transmission characteristics of an astronomical optical fiber, and the two patents propose optical fiber focal ratio degradation performance and transmittance testing systems. The optical fiber coupling calibration method comprises the following steps: and detecting the output energy of the optical fiber at the output end of the optical fiber by using an energy detector, and judging that the incident light coaxially irradiates the end face of the input end of the optical fiber when the energy reaches a peak value. The black box type judging method cannot objectively judge which of three common deviations exists when the incident light is coupled with the optical fiber, and is not beneficial to subsequent adjustment. Patent CN00249352 is an auxiliary adjusting device for observing fiber coupling in real time; CN201420305739 fiber coupled viewer: the three patents are all methods for observing coaxial transmission of a laser beam and a visible indication light beam by adopting a CCD (charge coupled device), and judging whether alignment is achieved by observing the position of the coupling front end of the optical fiber by naked eyes, so as to calibrate radial errors and finish a coupling process. The patent artificially judges whether the coupling condition is met or not by judging whether the two light beams are coaxial or not, the method introduces artificial errors, and meanwhile, the method only can observe radial deviation and cannot judge whether axial deviation and angle deviation exist in optical fiber coupling or not, so that the optimal coupling efficiency of the optical fiber is influenced.
Disclosure of Invention
The invention aims to overcome the defects of the existing optical fiber coupling alignment technology and overcome the defects of human errors, poor consideration of deviation conditions and the like in the background technology, and provides a space optical-optical fiber coupling alignment method for measuring the transmission characteristics of optical fibers.
The purpose of the invention is realized as follows:
the coupling alignment system adopted by the optical fiber coupling automatic alignment method is divided into three subsystems: the axial alignment system, the radial alignment system and the angle alignment system automatically eliminate axial deviation, radial deviation and angle deviation in sequence to realize automatic alignment of optical fiber coupling.
The scheme of the axial alignment system is as follows: the preposed optical fiber light source is used for polishing the input end of the optical fiber, the image acquisition device is used for acquiring light spots, and the light spots are subjected to circle fitting to obtain the diameter of a fitting circle. In addition, the energy change is detected at the output end of the optical fiber by a detector. And controlling the six-dimensional electric displacement table corresponding to the optical fiber input end to move back and forth, and determining that the end face of the optical fiber input end is positioned on the back focal plane of the light beam converging lens when the diameter of the fitting circle of the collected light spot is minimum and the energy detector reaches the peak value, so as to finish the calibration of the axial error.
Furthermore, the lenses adopted by the optical path adjusting module are all composite lenses, and are used for eliminating spherical aberration and chromatic aberration, avoiding different light spot sizes with different wavelengths, and improving the positioning accuracy.
Furthermore, the light splitting devices adopted by the light path adjusting module are all non-polarization beam splitters, so that the condition of splitting ratio change caused by polarization state change can be eliminated.
Furthermore, all image edge extraction is sub-pixel contour extraction, and image identification and processing precision is improved.
The scheme of the radial alignment system is as follows: the front-mounted optical fiber light source is used for polishing the input end of the optical fiber and the rear-mounted light source is used for polishing the output end of the optical fiber, the light beam reaches the image acquisition module through the light path adjusting module, and the light spot and the end face of the optical fiber are acquired by the image acquisition device. And performing circle fitting on the light spot and the end face of the optical fiber by using an algorithm to obtain the circle center coordinate of the light spot and the circle center coordinate of the optical fiber. The center of a circle of the end face of the optical fiber input end is coincided with the center of a light spot center by adjusting a six-dimensional electric displacement platform in the mechanical motion module corresponding to the optical fiber input end, so that the calibration of the radial error can be completed.
The scheme of the angle alignment system is as follows: first, the CCD camera is calibrated coaxially with the incident beam. And opening a front-mounted optical fiber light source, limiting the width of a light beam to be smaller by using a diaphragm, reflecting the light beam transmitted by the beam splitter by a reflector to enter a CCD camera (at the moment, a compound lens is not placed in front of the CCD), and collecting light spots. And performing circle fitting on the light spots by using an algorithm to obtain the position of the circle center. And controlling the CCD camera to move in the front and back directions, observing the offset delta D of the circle center position, and determining that the CCD camera and the incident light beam are coaxially aligned when the three-angle rotating direction of the six-dimensional electric displacement table is adjusted by using a hill-climbing search method until the offset delta D is 0.
Considering that the outgoing beam of the optical fiber has a certain divergence angle, the optical axis of the outgoing beam with a certain divergence angle will also be inclined when the optical fiber is inclined. Under the premise, the following steps are carried out:
(1) and under the condition that the CCD camera and the front incident beam are coaxial, the rear light source is turned on, and light is emitted from the output end of the optical fiber. After the light spot image is transformed by the lens group, the CCD camera is used for collecting the light spot image emitted from the end face of the optical fiber, and the circle center position C of the light spot is obtained through circle fitting0。
(2) Controlling the CCD camera to move △ L in the front and back directions, repeating the step (1) once, repeating N times to obtain C1,···，CNCalculate △ En＝Cn-Cn-1(n＝1,2···，N)。
(3) Obtaining the average angle of the centers of the two light spots through conversion
The input end of the optical fiber is controlled to rotate by an angle theta.
(4) And (3) repeating the steps (1) to (3) until the average angle theta in the step (3) is 0, and after the angle correction is completed, re-correcting the tiny axial deviation and radial deviation generated in the angle correction process by using a scheme of radial alignment and axial alignment.
Further, the hill climbing search algorithm comprises the following specific steps:
(1) controlling the angular rotation direction of the six-dimensional electric displacement platform, selecting the clockwise direction to perform rotary movement with fixed step length, detecting △ D once every step of movement, and if △ D is △ DN-△DN-1<0, entering the step (2) according to the current moving direction without changing the step length, and if △ D' is △ DN-△DN-1>0, then move in reverse and step (2) is entered without changing the step size.
(2) Moving in a prescribed step length and moving direction, detecting △ D once per moving until △ D' △ D appearsN-△DN-1>In the case of 0, the position of the point N-1 is defined as the peak position.
(3) And continuously moving for 1-5 steps according to the specified step length and the moving direction, and if △ D' is equal to △ DN-△DN-1<And 0, entering the step (4), and otherwise, entering the step (5).
(4) The movement is continued with a defined step size and direction of movement until the occurrence of a number △ D' △ DN-△DN-1>Comparing △ D center position deviation results of new and old peak values, if the center position deviation result △ D corresponding to the position of the old peak value is smaller than the deviation result △ D of the new peak value, entering step (5), otherwise, returning to step (3).
(5) And (4) reducing the step length by half and moving reversely, returning to the step (3) until the scanning is finished for 1-5 times, moving the six-dimensional electric displacement table to a new peak position, and stopping searching to obtain an optimal solution when the Delta D is 0.
The invention has the beneficial effects that:
under the condition of considering various coupling deviations, the position is determined by adopting the image processing method of machine vision, and the position parameters are fed back to the control system to carry out the automatic alignment of optical fiber coupling, so that the alignment precision is ensured, the optical fiber coupling efficiency is improved, the influence caused by the coupling focusing ratio degradation of the incident light beam and the optical fiber is eliminated, and the performance tests of the optical fiber such as the focusing ratio degradation, the transmissivity and the like are facilitated.
Drawings
FIG. 1 is a schematic diagram of a fiber coupling alignment system according to an embodiment of the present invention;
FIG. 2 is a schematic view of an axial alignment subsystem;
FIG. 3 is a schematic view of a radial alignment subsystem;
FIG. 4 is a schematic view of an angular alignment subsystem;
FIG. 5 is a schematic view of axial deflection and adjustment;
FIG. 6 is a schematic view of radial deflection and adjustment;
FIG. 7 is a schematic view of angular misalignment and adjustment;
FIG. 8 is a flow chart of fiber coupling alignment.
Wherein, each reference number in the figure means: 1-a fiber optic light source; 2. 6, 14-compound lens; 3. 13-a diaphragm; 4. 9, 15, 19-six-dimensional electric displacement table, 5-CCD camera; 7. 10, 22-beam splitter; 8-an image acquisition device; 11-a mirror; 12-a computer; 16-fiber input end; 17-a transmission fiber; 18-fiber output end; 21-a light source; 22-detector.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the present invention is described in more detail below by way of example with reference to the accompanying drawings:
referring to fig. 1, before the coupling calibration, the optical path coupling alignment system is set up. Adjusting the light path to ensure that the optical fiber light source 1, the compound lens 2, the diaphragm 3, the beam splitter 10 and the reflector 11 are coaxially aligned; ensuring the coaxial collimation of the compound lens 6, the beam splitters 7 and 10, the diaphragm 13 and the compound lens 14; ensuring the coaxial alignment of the beam splitter 7 and the image acquisition device 8. By adjusting the optical fiber light source 1 to be located on the front focal plane of the compound lens 2, the light beam emitted by the light source 1 is changed into parallel light through the lens 2, the parallel light passing through the diaphragm 3 (the aperture of the light is controlled according to the requirement) is reflected by the beam splitter 10 in the depolarizing state to change the direction, the light is converged on the rear focal plane through the compound lens 14, and the converged incident light circular spot is irradiated on the optical fiber input end 16. Meanwhile, in order to ensure that the end face of the optical fiber is positioned on the focal plane of the image acquisition device 8, clear imaging can be realized. The light source 20 is used for lighting from the back, the definition evaluation function is used as the evaluation standard, the electric displacement platform 9 is controlled to move until the definition evaluation function reaches the peak value, and the position of the image acquisition device 8 is considered to be right capable of clearly imaging the optical fiber end input end 16. And at this point, the optical path coupling alignment system finishes the adjustment work and starts to perform the automatic alignment of the optical fiber coupling.
A first part: the scheme content of the subsystem is axially aligned. Referring to fig. 5(a), the figure is a schematic view of the situation of axial deviation. Referring to fig. 2, the front optical fiber light source 1 performs light irradiation to the optical fiber input end 16, performs light spot collection by using the image collection device 8, and performs circle fitting on the light spots by using the computer 12 to obtain a fitting circle diameter. In addition, energy is detected at the output end of the fiber by detector 22. The six-dimensional electric displacement table 15 corresponding to the optical fiber input end 16 is controlled to move back and forth, the acquired light spots are subjected to fitting circle in real time (the image acquisition device 8 also moves correspondingly in the acquisition process to ensure that the definition evaluation index is unchanged, the image acquisition is clear), when the diameter of the fitting circle is minimum and the energy detector reaches the peak value, the end face of the optical fiber input end 16 can be determined to be on the back focal plane of the light beam converging lens 14, and the calibration of the axial error is finished, referring to fig. 5 (b).
A second part: the scheme content of the radial alignment subsystem. Referring to fig. 3, the optical fiber light source 1 is turned on, the blocking mirror 11 is finally converged at the optical fiber input end 16 through the optical path, and the image acquisition device 8 is used for acquiring the incident light spots. Referring to fig. 6(a), the figure is a schematic view of the radial deviation. Performing circle fitting on the light spot by using the computer 12 through an improved Hough transform algorithm to obtain a circle center coordinate A of the light spot0。
The optical fiber light source 1 is turned off, the light source 20 is turned on, the light is emitted from the optical fiber output end 19, and the image acquisition device 8 is used for acquiring the image of the optical fiber input end. Referring to fig. 2, the computer 12 performs circle fitting on the image at the input end of the optical fiber through an improved hough transform algorithm to obtain a circle center seat at the input end of the optical fiberMark A1. The distance and path of the two coordinates are transmitted into the control system 12 to form the center A of the incident light spot0As a reference point, the center a of the end face of the input end of the optical fiber is moved by adjusting the x displacement (left and right) direction and the y displacement (up and down) direction of the electric six-dimensional translation stage 15 corresponding to the input end of the optical fiber1And the center A of the light spot0And (4) overlapping. This completes the calibration of the radial error, as shown in fig. 4 (b).
The third part is that the content of an angle deviation correcting system, referring to the figure 4, the CCD camera 5 is coaxially calibrated with incident light, the shielding of the reflector 11 is removed, the optical fiber light source 1 is opened, the size of the diaphragm 3 is controlled, the width of the light beam is limited within a smaller range, the light beam transmitted by the beam splitter 10 is reflected by the reflector 11, the light beam is reflected by the beam splitter 10 and transmitted by the beam splitter 7, enters the CCD camera 5 for light spot acquisition, the computer 12 is used for carrying out circle fitting on the light spot through an improved Hough transform algorithm to obtain the position of the circle center, referring to the figure 7(a), the six-dimensional electric displacement table 4 is controlled to move △ Z in the Z displacement (front and back) direction, the offset △ D of the circle center position is observed, and the three angle rotation directions (theta) of the six-dimensional electric displacement table 4 are adjusted by a hillxDirection, thetayDirection, thetazDirection) until the offset △ D is 0, the CCD camera 5 is assumed to be coaxially aligned with the incident light beam.
Referring to fig. 7(b), the diagram is a schematic view of the case of angular deviation. Under the condition that the CCD camera and the front incident beam are coaxial, the following steps are carried out:
(1) with the CCD camera 5 and the front incident beam coaxial, the rear light source 20 is turned on, shining light from the fiber output end. After the transformation of the lens group, a light spot image emitted from the end face of the optical fiber is collected by a CCD camera 5, and the circle center position C of the light spot is obtained through circle fitting0。
(2) Controlling the CCD camera 5 to repeat the step (1) once every △ L of movement in the front and back directions, and repeating N times to obtain C1,···，CNCalculate △ En＝Cn-Cn-1(n＝1,2···，N)。
(3) Obtaining the average angle of the centers of the two light spots through conversion
The input end of the optical fiber is controlled to rotate by an angle theta.
(4) And (3) repeating the steps (1) to (3) until the average angle theta in the step (3) is 0, and after the angle correction is completed, re-correcting the tiny axial deviation and radial deviation generated in the angle correction process by using a scheme of radial alignment and axial alignment.
The three steps are used for solving the problems of angular deviation, axial deviation and radial deviation in the optical fiber alignment process, and the automatic alignment of optical fiber coupling is completed. The method improves the coupling efficiency of the optical fiber, solves the problem of the influence of the coupling deviation of the optical fiber on the focal ratio degradation, and is beneficial to the performance tests of the focal ratio degradation performance, the transmittance performance and the like of the optical fiber.
The invention provides a space optical-fiber coupling alignment method for measuring the transmission characteristics of optical fibers. The coupling alignment system adopted by the method consists of an axial alignment system, a radial alignment system and an angle alignment system, and the three subsystems are used for carrying out fine alignment of optical fiber coupling. The axial alignment system reads the image and the data of the detector and feeds the parameters back to the control system, so that the axial deviation is eliminated, and the light spot convergence point is ensured to be coincident with the output end face of the optical fiber; the radial alignment system reads the image and feeds back the parameters to the control system, so that radial errors are eliminated, and coaxial incidence of incident light beams is ensured; the angle alignment system reads the image and feeds parameters back to the control system, so that the angle deviation is eliminated, and the condition that the light beam is obliquely incident is avoided. The method has high alignment precision, realizes the visualization of the optical fiber coupling alignment and is convenient for real-time observation. The method provided by the invention can realize the automatic alignment of optical fiber coupling, and the control system is adopted to control the mechanical motion device to automatically complete the whole coupling alignment process, so that the automation degree is high. The invention realizes the visualization of the optical fiber coupling alignment, so that the result can be quantized and the graphic file can be stored for reference. The sub-pixel contour extraction is adopted during image processing, the imaging quality is high, the positioning precision is accurate, and the stability and the reliability of the optical fiber coupling alignment method are improved. Compared with the traditional optical fiber coupling method only considering the radial error, the optical fiber coupling automatic alignment method provided by the invention also processes the angular deviation and the axial deviation on the basis.
The foregoing is merely a preferred embodiment of the invention, but it should be understood that the invention is not limited thereto. Any modification, improvement or the like within the principle of the present invention shall fall within the protection scope of the present invention.
Claims (9)
1. A spatial light-fiber coupling alignment method for optical fiber transmission characteristic measurement, characterized by: the coupling alignment system adopted by the optical fiber coupling automatic alignment method is divided into three subsystems: the axial alignment system, the radial alignment system and the angle alignment system automatically eliminate axial deviation, radial deviation and angle deviation in sequence to realize automatic alignment of optical fiber coupling.
2. The method for aligning the spatial light-fiber coupling for the measurement of the transmission characteristics of the optical fiber according to claim 1, wherein the scheme of the axial alignment system is as follows: the preposed optical fiber light source polishes the input end of the optical fiber, and an image acquisition device is used for acquiring light spots, so that the light spots are subjected to circle fitting to obtain the diameter of a fitting circle; in addition, the energy change is detected at the output end of the optical fiber by a detector; and controlling the six-dimensional electric displacement table corresponding to the optical fiber input end to move back and forth, and determining that the end face of the optical fiber input end is positioned on the back focal plane of the light beam converging lens when the diameter of the fitting circle of the collected light spot is minimum and the energy detector reaches the peak value, so as to finish the calibration of the axial error.
3. A spatial optical-fiber coupling alignment method for optical fiber transmission characteristic measurement according to claim 2, wherein: the lenses adopted by the light path adjusting module are all composite lenses.
4. A method of spatial optical-fiber coupling alignment for optical fiber transmission characteristic measurement according to claim 3, wherein: the light splitting devices adopted by the light path adjusting module are all non-polarization beam splitters.
5. The method of claim 4, wherein the method comprises: all image edge extraction is sub-pixel contour extraction.
6. The method of claim 5, wherein the radial alignment system is configured as follows: the front-mounted optical fiber light source is used for polishing the input end of the optical fiber and the rear-mounted light source is used for polishing the output end of the optical fiber, the light beam reaches the image acquisition module through the light path adjusting module, and the light spot and the end face of the optical fiber are acquired by the image acquisition device; performing circle fitting on the light spot and the end face of the optical fiber by using an algorithm to obtain the circle center coordinate of the light spot and the circle center coordinate of the optical fiber; the circle center of the end face of the optical fiber input end is coincided with the circle center of the light spot by adjusting the six-dimensional electric displacement platform in the mechanical motion module corresponding to the optical fiber input end.
7. The method of claim 6, wherein the scheme of the angular alignment system is as follows: firstly, carrying out coaxial calibration on a CCD camera and an incident beam; opening a front-mounted optical fiber light source, limiting the width of a light beam to be smaller by using a diaphragm, reflecting the light beam transmitted by a beam splitter by a reflector to enter a CCD (charge coupled device) camera, and collecting light spots; performing circle fitting on the light spots by using an algorithm to obtain the position of the circle center; and controlling the CCD camera to move in the front and back directions, observing the offset delta D of the circle center position, and determining that the CCD camera and the incident light beam are coaxially aligned when the three-angle rotating direction of the six-dimensional electric displacement table is adjusted by using a hill-climbing search method until the offset delta D is 0.
8. The method of claim 7, comprising the steps of:
(1) under the condition that the CCD camera and the front incident beam are coaxial, a rear light source is turned on, and light is emitted from the output end of the optical fiber; after the light spot image is transformed by the lens group, the CCD camera is used for collecting the light spot image emitted from the end face of the optical fiber, and the circle center position C of the light spot is obtained through circle fitting0；
(2) Controlling the CCD camera to move △ L in the front and back directions, repeating the step (1) once, repeating N times to obtain C1，…，CNCalculate △ En＝Cn-Cn-1，n＝1，2…，N；
(3) Obtaining the average angle of the centers of the two light spots through conversion
Controlling the input end of the optical fiber to rotate by an angle theta;
(4) and (3) repeating the steps (1) to (3) until the average angle theta in the step (3) is 0, and after the angle correction is completed, re-correcting the tiny axial deviation and radial deviation generated in the angle correction process by using a scheme of radial alignment and axial alignment.
9. The method according to claim 8, wherein the hill-climbing search algorithm comprises the following steps:
(1) controlling the angular rotation direction of the six-dimensional electric displacement platform, selecting clockwise direction to perform rotation movement with fixed step length, detecting △ D once per step of movement, and if △ D' is △ DN-△DN-1<0, entering the step (2) according to the current moving direction without changing the step length, and if △ D' is △ DN-△DN-1>0, moving in the reverse direction without changing the step length and entering the step (2);
(2) moving in a prescribed step length and moving direction, detecting △ D once per moving until △ D' △ D appearsN-△DN-1>0, the position of the point N-1 is taken as the peak position;
(3) and continuously moving for 1-5 steps according to the specified step length and the moving direction, and if △ D' is equal to △ DN-△DN-1<0, entering the step (4), otherwise, entering the step (5);
(4) the movement is continued with a defined step size and direction of movement until the occurrence of a number △ D' △ DN-△DN-1>Comparing △ D center position deviation results of new and old peak values, if △ D center position deviation result corresponding to old peak value position is smaller than △ D center position deviation result corresponding to new peak value position, entering step (5), otherwise returning to step (3);
(5) and (4) reducing the step length by half and moving reversely, returning to the step (3) until the scanning is finished for 1-5 times, moving the six-dimensional electric displacement table to a new peak position, and stopping searching to obtain an optimal solution when the Delta D is 0.
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| CN114112942A (en) * | 2021-12-17 | 2022-03-01 | 中国电子科技集团公司第十三研究所 | Optical fiber corner cut direction alignment equipment and alignment method |
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