CN114325956A - Optical path system and method for testing fiber core of multi-core optical fiber - Google Patents
Optical path system and method for testing fiber core of multi-core optical fiber Download PDFInfo
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Abstract
The invention belongs to the technical field of multi-core optical fiber testing, and discloses an optical path system and method for testing a fiber core of a multi-core optical fiber. When the method is used for testing a certain fiber core in the tested multi-core fiber, the first end face and the second end face of the tested multi-core fiber are respectively subjected to axial center alignment; coupling the light of a point light source into one end face of a measured multi-core optical fiber, collecting images of the other end face, and sequentially aligning fiber cores of the two end faces according to the collected images; transmitting light emitted by the wide-spectrum light source to the first end face of the multi-core optical fiber to be tested, and transmitting the light out of the second end face to the second camera to finish the geometric parameter test; keeping the optical path unchanged, and transmitting the light emitted from the second end face to a photoelectric detector to finish the cut-off wavelength test; and after the fiber core measurement is finished, repeating the steps and sequentially finishing the test of other fiber cores. The optical path system and the method provided by the invention can be used for directly testing the multi-core optical fiber, and have the advantages of high automation degree and simple operation.
Description
Technical Field
The invention belongs to the technical field of multi-core optical fiber testing, and particularly relates to an optical path system and method for testing a multi-core optical fiber core.
Background
Optical fibers are widely applied in various industries, so that the performance of the optical fibers is very important to test, and especially the geometric parameter test and the cut-off wavelength test of the optical fibers are required. However, the optical fiber testing system in the market at present, whether a multimode optical fiber optical path system or a single mode optical fiber optical path system, cannot directly test the multicore optical fiber core.
Disclosure of Invention
The invention provides an optical path system and method for testing a fiber core of a multi-core fiber, and solves the problem that an optical fiber testing system in the prior art cannot directly test the multi-core fiber.
The invention provides a method for testing a fiber core of a multi-core optical fiber, which comprises the following steps of:
step 1, respectively aligning the first end face and the second end face of a measured multi-core optical fiber in an axial center manner;
step 3, transmitting the light emitted by the point light source to the first end surface of the tested multi-core fiber, carrying out image acquisition on the second end surface of the tested multi-core fiber, and carrying out fiber core alignment on the second end surface of the tested multi-core fiber according to the acquired image so as to enable the illuminated fiber core to be tested in the tested multi-core fiber to be positioned at the axial center position of the light path;
step 4, transmitting light emitted by the wide-spectrum light source to the first end face of the tested multi-core fiber, and transmitting the light out of the second end face of the tested multi-core fiber to the second camera to complete the geometric parameter test of the tested multi-core fiber;
step 5, keeping the light path of the light emitted by the wide-spectrum light source and transmitted to the first end face of the tested multi-core fiber unchanged, transmitting the light emitted by the second end face of the tested multi-core fiber to the photoelectric detector, and completing the cut-off wavelength test of the tested multi-core fiber;
and after the fiber core test is finished, repeating the steps and sequentially finishing the test of other fiber cores.
Preferably, before testing the tested multi-core fiber, the first end face of the tested multi-core fiber is placed on a first automatic three-axis displacement table, and the second end face of the tested multi-core fiber is placed on a second automatic three-axis displacement table; a first illuminating device, a first focusing collimating device, a first transflective lens, the wide-spectrum light source and a first camera are respectively arranged in one side area corresponding to the first end face of the measured multi-core optical fiber; a second illumination device, a second focusing and collimating device, a second semi-transparent and semi-reflective lens, the second camera and the photoelectric detector are respectively arranged in one side area corresponding to the second end surface of the multi-core optical fiber to be detected; the point light source is arranged between the first semi-transparent semi-reflective lens and the second semi-transparent semi-reflective lens.
Preferably, the first illumination device, the first focusing collimator, the first transflective lens and the wide-spectrum light source are respectively arranged in a region corresponding to the first end face of the multi-core fiber to be tested along an axis, and the first camera is arranged on a reflection light path of the first transflective lens; the region corresponding to the second end face of the multi-core optical fiber to be tested is respectively provided with the second illumination device, the second focusing collimation device, the second semi-transparent semi-reflective lens and the second camera along an axis, and the photoelectric detector is arranged on a reflection light path of the second semi-transparent semi-reflective lens.
Preferably, the specific implementation manner of step 1 is as follows: the first illumination device is started, light emitted by the first illumination device irradiates on a first end face of the multi-core optical fiber to be measured, the light reflected by the first end face sequentially passes through the first focusing collimation device and the first semi-transparent semi-reflective lens and then enters the first camera, the first automatic three-axis displacement table is controlled to move according to an image collected by the first camera, so that the axis center of the first end face of the multi-core optical fiber to be measured is aligned with the axis center of the first focusing collimation device, and the obtained image of the first end face of the multi-core optical fiber to be measured is located at the center of the view field of the first camera; and starting the second lighting device, wherein light emitted by the second lighting device irradiates on a second end face of the measured multi-core optical fiber, the light reflected by the second end face sequentially passes through the second focusing collimating device and the second semi-transparent semi-reflective lens and then enters the second camera, the second automatic three-axis displacement table is controlled to move according to the image collected by the second camera, so that the axis center of the second end face of the measured multi-core optical fiber is aligned with the axis center of the second focusing collimating device, and the obtained image of the second end face of the measured multi-core optical fiber is located at the central position of the view field of the second camera.
Preferably, the specific implementation manner of step 2 is as follows: the point light source is started, light emitted by the point light source is reflected by the second semi-transparent semi-reflective lens and coupled into the second end surface of the multi-core optical fiber to be detected after passing through the second focusing collimating device, the coupled light comes out from the first end surface of the multi-core optical fiber to be detected, then the coupled light sequentially passes through the first focusing collimating device and the first semi-transparent semi-reflective lens and then enters the first camera, and an image of the first end surface of the multi-core optical fiber to be detected is acquired by the first camera; based on the obtained image, the first automatic triaxial displacement table is used for carrying out vertical and horizontal alignment operation, so that a certain fiber core to be detected in the detected multi-core optical fiber is aligned with the central position of the first camera view field, and is simultaneously aligned with the axial central position of the first focusing collimation device.
Preferably, in the step 2, in the process of obtaining the image of the first end surface of the measured multi-core optical fiber, the second automatic three-axis displacement stage is controlled to move forward or backward along the axial center direction of the second focusing and collimating device, so that the second end surface of the measured multi-core optical fiber is located at the focal position of the second focusing and collimating device, and it is ensured that each fiber core of the measured multi-core optical fiber has light.
Preferably, the step 2 further comprises: and irradiating the first end face of the measured multi-core optical fiber through the first illuminating device to obtain clearer imaging of the end face of the optical fiber.
Preferably, the specific implementation manner of step 3 is as follows: the point light source is started, light emitted by the point light source is reflected by the first semi-transparent semi-reflective lens and coupled into the first end face of the multi-core optical fiber to be detected after passing through the first focusing collimating device, the coupled light is emitted from the second end face of the multi-core optical fiber to be detected, then the coupled light sequentially passes through the second focusing collimating device and the second semi-transparent semi-reflective lens and is incident to the second camera, and an image of the second end face of the multi-core optical fiber to be detected is acquired by the second camera; based on the obtained image, the second automatic triaxial displacement table is used for carrying out up-down and left-right alignment operation, so that a certain core to be tested, which is illuminated in the tested multi-core optical fiber, is aligned with the central position of the field of view of the second camera, and is aligned with the axial central position of the second focusing and collimating device.
Preferably, the step 3 further comprises: and irradiating the second end face of the measured multi-core optical fiber through the second illuminating device to obtain clearer imaging of the end face of the optical fiber.
Preferably, the specific implementation manner of step 4 is as follows: turning on the wide-spectrum light source, wherein light emitted by the wide-spectrum light source is coupled into the first end face of the multi-core optical fiber to be detected after sequentially passing through the first semi-transparent semi-reflective lens and the first focusing collimating device; light comes out from the second end face of the multi-core optical fiber to be detected, then sequentially passes through the second focusing and collimating device and the second semi-transparent and semi-reflective lens and then is transmitted to the second camera; and performing geometric parameter test on a certain illuminated fiber core to be tested in the tested multi-core fiber based on the image obtained by the second camera.
Preferably, the specific implementation manner of step 5 is as follows: turning on the wide-spectrum light source, wherein light emitted by the wide-spectrum light source is coupled into the first end face of the multi-core optical fiber to be detected after sequentially passing through the first semi-transparent semi-reflective lens and the first focusing collimating device; light comes out from the second end face of the multi-core optical fiber to be detected, then sequentially passes through the second focusing collimating device and the second semi-transparent semi-reflective lens and then is transmitted to the photoelectric detector; and based on the light output power of the tested multi-core fiber obtained by the photoelectric detector, combining with the corresponding wavelength setting in the wide-spectrum light source, and performing cut-off wavelength test on a certain fiber core to be tested which is already illuminated in the tested multi-core fiber.
In another aspect, the present invention provides an optical path system for testing a core of a multicore fiber, including: the device comprises a first camera, a wide-spectrum light source, a first semi-transparent semi-reflective lens, a first focusing collimation device, a first illumination device, a first automatic three-axis displacement table, a second camera, a second semi-transparent semi-reflective lens, a second focusing collimation device, a second illumination device, a second automatic three-axis displacement table, a photoelectric detector and a point light source; the optical path system for testing the fiber core of the multi-core optical fiber is used for realizing the steps in the method for testing the fiber core of the multi-core optical fiber.
Preferably, the wavelength range of the point light source is 800-900 nm; the first lighting device and the second lighting device both adopt ring lamps with the wavelength range of 800-900 nm; the first focusing and collimating device and the second focusing and collimating device both adopt plano-convex lenses.
Preferably, the wavelength of the point light source is 850 nm; the first lighting device and the second lighting device both adopt 850nm ring lamps.
Preferably, the optical path system for testing the core of the multicore optical fiber further includes: a first reflector and a second reflector; the first reflector is arranged on a light path between the first transflective lens and the first camera; the second reflecting mirror is arranged on a light path between the second half-mirror and the photoelectric detector; the first reflector is used for adjusting the placement position of the first camera, and the second reflector is used for adjusting the placement position of the photoelectric detector.
One or more technical schemes provided by the invention at least have the following technical effects or advantages:
in the invention, when testing a certain fiber core in the tested multi-core fiber, firstly, respectively aligning the first end surface and the second end surface of the tested multi-core fiber with the axis center; then, transmitting light emitted by the point light source to a second end face of the measured multi-core fiber, carrying out image acquisition on the first end face of the measured multi-core fiber, and carrying out fiber core alignment on the first end face of the measured multi-core fiber according to the acquired image so as to enable a fiber core to be tested in the measured multi-core fiber to be positioned at the axial center position of a light path; transmitting light emitted by a point light source to a first end face of a measured multi-core fiber, carrying out image acquisition on a second end face of the measured multi-core fiber, and carrying out fiber core alignment on the second end face of the measured multi-core fiber according to the acquired image so that the illuminated fiber core to be tested in the measured multi-core fiber is positioned at the axial center position of a light path, thereby realizing automatic alignment; after alignment is realized, a specific measurement stage is entered, light emitted by the wide-spectrum light source is transmitted to the first end face of the tested multi-core fiber, the light comes out from the second end face of the tested multi-core fiber and is transmitted to the second camera, and the test of the geometric parameters of the tested multi-core fiber is completed; keeping the light path of the light emitted by the wide-spectrum light source and transmitted to the first end face of the tested multi-core fiber unchanged, transmitting the light emitted by the second end face of the tested multi-core fiber to the photoelectric detector, and completing the cut-off wavelength test of the tested multi-core fiber; and after the fiber core test is finished, repeating the steps and sequentially finishing the test of other fiber cores. The invention provides a method and an optical path system capable of directly testing multi-core optical fibers, which are different from the prior alignment, optical path testing system and design thought of all the multi-core optical fiber cores. The optical path system provided by the invention can realize automatic alignment and direct test of the fiber core of the multi-core fiber, and can accurately measure parameters such as the cladding diameter, the cladding non-circularity, the core/cladding concentricity error, the cut-off wavelength and the like of the multi-core fiber.
Drawings
Fig. 1 is a schematic flowchart of a method for testing cores of a multicore optical fiber according to embodiment 1 of the present invention;
fig. 2 is a block diagram of an optical path system for testing cores of a multicore optical fiber according to embodiment 2 of the present invention;
fig. 3 is a diagram of an optical path propagation path corresponding to step 1 in embodiment 2;
FIG. 4 is an image of the multi-core optical fiber to be tested in step 2 of example 2, in which the core to be tested is located at the axial center position of the optical path;
FIG. 5 is a diagram of an optical path propagation path corresponding to step 2 in example 2;
FIG. 6 is an image of the multi-core optical fiber under test in step 3 of example 2, in which the core to be tested that has been illuminated is located at the axial center position of the optical path;
fig. 7 is a diagram of an optical path propagation path corresponding to step 3 in embodiment 2;
fig. 8 is a diagram of an optical path propagation path corresponding to step 4 in embodiment 2;
fig. 9 is a diagram of an optical path propagation path corresponding to step 5 in embodiment 2;
fig. 10 is a block diagram of an optical path system for testing cores of a multicore fiber according to embodiment 3 of the present invention.
The device comprises a light source, a first reflector, a first camera, a wide-spectrum light source, a first transflective lens, a first focusing collimator, a first illuminating device, a first automatic three-axis displacement table, a multi-core optical fiber to be tested, a second camera, a second transflective lens, a second semitransparent lens, a second focusing collimator, a second illuminating device, a third automatic three-axis displacement table, a fourth automatic three-axis displacement table, a fifth automatic three-axis displacement table, a sixth automatic three-axis displacement table, a fifth automatic displacement table, a sixth automatic displacement table, a fifth automatic displacement table, a sixth automatic displacement table, a fifth automatic displacement table, a sixth automatic displacement table, a fifth automatic displacement table, a sixth automatic displacement table, a fifth.
Detailed Description
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Example 1:
embodiment 1 provides a method for testing cores of a multicore fiber, and referring to fig. 1 to 9, before testing a multicore fiber 88 to be tested, a first end face (e.g., left end face) of the multicore fiber 88 to be tested is placed on a first automatic triaxial displacement stage 87, and a second end face (e.g., right end face) of the multicore fiber 88 to be tested is placed on a second automatic triaxial displacement stage 93. A first illuminating device 86, a first focusing collimation device 85, a first transflective lens 84, the wide-spectrum light source 83 and a first camera 82 are respectively arranged in one side area corresponding to a first end face of a measured multi-core optical fiber 88; a second illumination device 92, a second focusing and collimating device 91, a second half-mirror 90, the second camera 89 and the photodetector 94 are respectively arranged in a side region corresponding to the second end face of the multi-core optical fiber 88 to be tested; the point light source 96 is disposed between the first transflective lens 84 and the second transflective lens 90.
When testing a certain core in the tested multicore fiber 88, the method comprises the following steps:
step 1, respectively aligning the first end face and the second end face of the measured multi-core optical fiber 88 in the axial center.
The specific implementation manner of the step 1 is as follows: the first lighting device 86 is turned on, light emitted by the first lighting device 86 irradiates on the first end face of the measured multi-core fiber 88, light reflected by the first end face sequentially passes through the first focusing collimating device 85 and the first half-transmitting and half-reflecting lens 84 and then enters the first camera 82, the first automatic three-axis displacement table 87 is controlled to move according to an image collected by the first camera 82, so that the axis center of the first end face of the measured multi-core fiber 88 is aligned with the axis center of the first focusing collimating device 85, and the obtained image of the first end face of the measured multi-core fiber 88 is located at the center of the field of view of the first camera 82. And turning on the second illumination device 92, wherein light emitted by the second illumination device 92 irradiates on the second end face of the measured multi-core fiber 88, the light reflected by the second end face sequentially passes through the second focusing and collimating device 91 and the second half-mirror 90 and then enters the second camera 89, the second automatic three-axis displacement stage 93 is controlled to move according to the image collected by the second camera 89, so that the axis center of the second end face of the measured multi-core fiber 88 is aligned with the axis center of the second focusing and collimating device 91, and the obtained image of the second end face of the measured multi-core fiber 88 is located at the center position of the view field of the second camera 89. The optical path propagation path of step 1 is shown in fig. 3.
And 2, transmitting the light emitted by the point light source 96 to the second end surface of the tested multi-core fiber 88, carrying out image acquisition on the first end surface of the tested multi-core fiber 88, and carrying out fiber core alignment on the first end surface of the tested multi-core fiber 88 according to the acquired image so that the fiber core to be tested in the tested multi-core fiber 88 is positioned at the axial center position of the optical path.
The specific implementation manner of the step 2 is as follows: and starting the point light source 96, wherein light emitted by the point light source 96 is reflected by the second semi-transparent semi-reflective lens 90 and is coupled into the second end surface of the measured multi-core fiber 88 after passing through the second focusing collimating device 91, the coupled light comes out from the first end surface of the measured multi-core fiber 88, then sequentially passes through the first focusing collimating device 85 and the first semi-transparent semi-reflective lens 84 and is incident to the first camera 82, and an image of the first end surface of the measured multi-core fiber 88 is acquired by the first camera 82. Based on the obtained image, the first automatic triaxial displacement table 87 performs vertical and horizontal alignment operations, so that a certain fiber core to be measured in the measured multicore fiber 88 (for example, the right and uppermost fiber cores of the multicore fiber) is aligned with the central position of the field of view of the first camera 82, and is also aligned with the axial central position of the first focusing collimator 85, and the image obtained after alignment (i.e., the image of the bright spots on the fiber core at the left end surface of the measured multicore fiber) is as shown in fig. 4. The optical path propagation path of step 2 is shown in fig. 5.
In the process of acquiring the image of the first end face of the measured multi-core fiber 88, the second automatic three-axis displacement stage 93 is controlled to move forward or backward along the axial center direction of the second focusing and collimating device 91, so that the second end face of the measured multi-core fiber 88 is at the focal position of the second focusing and collimating device 91, and light is ensured to exit from each fiber core of the measured multi-core fiber 88.
In a preferred embodiment, the step 2 further includes: the first end face of the multi-core fiber 88 to be tested is irradiated by the first illuminating device 86 to obtain clearer imaging of the end face of the fiber.
And 3, transmitting the light emitted by the point light source 96 to the first end surface of the tested multi-core fiber 88, carrying out image acquisition on the second end surface of the tested multi-core fiber 88, and carrying out fiber core alignment on the second end surface of the tested multi-core fiber 88 according to the acquired image so that the illuminated fiber core to be tested in the tested multi-core fiber 88 is positioned at the axial center position of the light path.
The specific implementation manner of the step 3 is as follows: and starting the point light source 96, wherein light emitted by the point light source 96 is reflected by the first semi-transparent semi-reflective lens 84, is coupled into the first end surface of the measured multi-core fiber 88 after passing through the first focusing collimating device 85, is coupled into the second end surface of the measured multi-core fiber 88, then sequentially passes through the second focusing collimating device 91 and the second semi-transparent semi-reflective lens 90, is incident into the second camera 89, and is collected by the second camera 89 to obtain an image of the second end surface of the measured multi-core fiber 88. Based on the obtained image, the second automatic triaxial displacement stage 93 performs vertical and horizontal alignment operations, so that a certain core to be tested, which is already illuminated in the tested multicore fiber 88, is aligned with the central position of the field of view of the second camera 89, and is also aligned with the axial central position of the second focusing and collimating device 91, and the image obtained after alignment (i.e. the bright spot image of a certain core on the right end face of the tested multicore fiber) is as shown in fig. 6. The optical path propagation path of step 3 is shown in fig. 7.
In a preferred embodiment, the step 3 further includes: the second end face of the multi-core optical fiber 88 to be tested is irradiated by the second illuminating device 92 to obtain clearer imaging of the end face of the optical fiber.
And 4, transmitting the light emitted by the wide-spectrum light source 83 to the first end face of the tested multi-core fiber 88, and transmitting the light out of the second end face of the tested multi-core fiber 88 to the second camera 89 to complete the geometric parameter test of the tested multi-core fiber 88.
The specific implementation manner of the step 4 is as follows: turning on the wide-spectrum light source 83, wherein light emitted by the wide-spectrum light source 83 passes through the first transflective lens 84 and the first focusing collimator 85 in sequence and then is coupled into a first end face of a measured multi-core fiber 88; the light comes out from the second end face of the multi-core fiber 88 to be measured, and then sequentially passes through the second focusing and collimating device 91 and the second half-transparent and half-reflective lens 90 and then is transmitted to the second camera 89; and performing geometric parameter test on a certain core to be tested which is illuminated in the tested multi-core optical fiber 88 based on the image obtained by the second camera 89. The optical path propagation path of step 4 is shown in fig. 8.
It should be noted that the specific implementation process of performing the geometric parameter test on the fiber core based on the image acquired by the camera may be implemented by using the existing geometric parameter test flow, and the key point of the present invention is the design of the optical path system.
And step 5, keeping the optical path of the light emitted by the wide-spectrum light source 83, which is transmitted to the first end face of the tested multi-core fiber 88, unchanged, transmitting the light emitted from the second end face of the tested multi-core fiber 88 to the photoelectric detector 94, and completing the cut-off wavelength test of the tested multi-core fiber 88.
The specific implementation manner of the step 5 is as follows: turning on the wide-spectrum light source 83, wherein light emitted by the wide-spectrum light source 83 passes through the first transflective lens 84 and the first focusing collimator 85 in sequence and then is coupled into a first end face of a measured multi-core fiber 88; the light comes out from the second end face of the multi-core fiber 88 to be detected, and then sequentially passes through the second focusing and collimating device 91 and the second semi-transparent and semi-reflective lens 90 and then is transmitted to the photodetector 94; based on the light output power of the tested multicore fiber 88 obtained by the photodetector 94, a cut-off wavelength test is performed on a certain core to be tested, which is already illuminated in the tested multicore fiber 88, in combination with the corresponding wavelength setting in the wide-spectrum light source 83. The optical path propagation path of step 5 is shown in fig. 9.
It should be noted that the specific implementation process of performing the cut-off wavelength test on the fiber core based on the light output power of the measured multicore fiber obtained by the photodetector and in combination with the corresponding wavelength setting in the wide-spectrum light source may be implemented by using the existing cut-off wavelength test flow, and the key point of the present invention is the design of the optical path system.
And after the fiber core test is finished, repeating the steps and sequentially finishing the test of other fiber cores.
After the geometric parameters and cut-off wavelengths of a certain fiber core of the measured multi-core fiber are measured, the residual fiber cores can be measured one by adopting the optical paths corresponding to the steps until the geometric parameters and cut-off wavelengths of all the fiber cores in the multi-core fiber are measured.
For example, after the right and uppermost cores of the multicore fiber to be tested are measured, the cores of the multicore fiber are sequentially tested clockwise (or according to other sequences) in the same manner. The invention is suitable for optical fibers with the number of optical fiber cores being 1, 2, 3, · · N (N is a positive integer).
When the positions of the devices are specifically set, it is preferable that the first illumination device 86, the first focusing collimator 85, the first half-mirror 84 and the wide-spectrum light source 83 are respectively set along an axis in a region corresponding to the first end face of the multi-core fiber 88 to be measured, and the first camera 82 is set on a reflection light path of the first half-mirror 84; the second illumination device 92, the second focusing collimator 91, the second half-mirror 90 and the second camera 89 are respectively disposed in a region corresponding to the second end surface of the multi-core fiber 88 to be measured along an axis, and the photodetector 94 is disposed on a reflection light path of the second half-mirror 90.
Since the image collected by the first camera 82 is mainly used as an auxiliary function, and the spectrum and power of the light output by the wide-spectrum light source 83 affect the measurement result, the wide-spectrum light source 83 is placed at the center of the axis to obtain a more accurate measurement result. Since the direct entry of the end face image into the second camera 89 can reduce the reflected path of light and can thereby avoid distortion of the image entering the second camera 89, the second camera 89 is preferably placed at the axial center position.
Example 2:
The optical path system for testing the core of the multicore optical fiber provided in embodiment 2 is used to implement the steps in the method for testing the core of the multicore optical fiber provided in embodiment 1. Therefore, the functions of the devices in embodiment 2 can be referred to the description of embodiment 1, and are not described herein again.
Wherein the wavelength range of the point light source 96 is 800-900 nm; the first illumination device 86 and the second illumination device 92 both adopt ring lamps with the wavelength range of 800 and 900 nm. In a preferred scheme, the wavelength of the point light source 96 is 850 nm; the first illumination device 86 and the second illumination device 92 both adopt 850nm ring lamps. Because the test range during the cut-off wavelength test is 1000-1700nm, the range of visible light is about 350-750nm, and the adopted camera is more sensitive to the light with the wavelength of 350-900nm, the suitable range of the wavelength of the point light source 96 is 800-900nm, preferably 850nm, and the interference of the ambient light can be avoided. The first illumination device 86 and the second illumination device 92 have the same wavelength as the point light source 96, so that the interference of the ambient light can be avoided, and the first illumination device 86 and the second illumination device 92 both preferably adopt 850nm ring lamps based on the same consideration. The ring lamp can enable light reflected by the end face of the optical fiber to be more uniform, and the image collected by the camera is closer to the real end face of the optical fiber, so that a more accurate value or image can be obtained.
Specifically, the first focusing collimator 85 and the second focusing collimator 91 may both adopt plano-convex lenses.
An optical path position adjusting device was added to example 2 to obtain example 3.
Example 3:
the difference from embodiment 2 is that embodiment 3 provides an optical path system for testing cores of a multicore fiber, further including: a first reflector 81 and a second reflector 95. The first reflector 81 is disposed on the light path between the first half mirror 84 and the first camera 82; the second reflecting mirror 95 is disposed on the optical path between the second half mirror 90 and the photodetector 94; the placement position of the first camera 82 is adjusted by the first mirror 81, and the placement position of the photodetector 94 is adjusted by the second mirror 95, as shown in fig. 10.
Embodiment 3 can more flexibly set the placement positions of the first camera 82 and the electrical detector 94, and can be applied to application scenarios with certain specific requirements or position restrictions.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (15)
1. A method of testing cores of a multicore optical fiber, characterized in that, when testing a certain core in a multicore optical fiber (88) under test, it comprises the following steps:
step 1, respectively aligning the first end face and the second end face of a measured multi-core optical fiber (88) in an axial center manner;
step 2, transmitting light emitted by a point light source (96) to a second end face of the tested multi-core fiber (88), carrying out image acquisition on the first end face of the tested multi-core fiber (88), and carrying out fiber core alignment on the first end face of the tested multi-core fiber (88) according to the acquired image so as to enable a fiber core to be tested in the tested multi-core fiber (88) to be positioned at the axial center position of a light path;
step 3, transmitting the light emitted by the point light source (96) to a first end face of the tested multi-core fiber (88), carrying out image acquisition on a second end face of the tested multi-core fiber (88), and carrying out fiber core alignment on the second end face of the tested multi-core fiber (88) according to the acquired image so as to enable the illuminated fiber core to be tested in the tested multi-core fiber (88) to be positioned at the axial center position of a light path;
step 4, transmitting the light emitted by the wide-spectrum light source (83) to a first end face of the tested multi-core fiber (88), and transmitting the light out of a second end face of the tested multi-core fiber (88) to a second camera (89) to complete the geometric parameter test of the tested multi-core fiber (88);
step 5, keeping the optical path of the light emitted by the wide-spectrum light source (83) transmitted to the first end face of the tested multi-core fiber (88) unchanged, transmitting the light emitted from the second end face of the tested multi-core fiber (88) to the photoelectric detector (94), and completing the cut-off wavelength test of the tested multi-core fiber (88);
and after the fiber core test is finished, repeating the steps and sequentially finishing the test of other fiber cores.
2. The method for testing cores of multicore optical fibers according to claim 1, wherein, before the testing of the multicore optical fiber (88) under test, the first end face of the multicore optical fiber (88) under test is placed on a first automatic triaxial displacement stage (87), the second end face of the multicore optical fiber (88) under test is placed on a second automatic triaxial displacement stage (93);
a first illuminating device (86), a first focusing collimation device (85), a first half-transmitting and half-reflecting lens (84), the wide-spectrum light source (83) and a first camera (82) are respectively arranged in one side area corresponding to a first end face of a measured multi-core optical fiber (88); a second illumination device (92), a second focusing and collimating device (91), a second half-mirror lens (90), the second camera (89) and the photoelectric detector (94) are respectively arranged in one side area corresponding to the second end face of the multi-core optical fiber (88) to be detected; the point light source (96) is disposed between the first transflective lens (84) and the second transflective lens (90).
3. The method for testing the core of the multicore optical fiber according to claim 2, wherein the first illumination device (86), the first focusing collimation device (85), the first transflective lens (84) and the wide spectrum light source (83) are respectively disposed along an axis in a region corresponding to the first end surface of the multicore optical fiber (88) to be tested, and the first camera (82) is disposed on a reflection light path of the first transflective lens (84);
the region corresponding to the second end face of the multi-core optical fiber (88) to be tested is respectively provided with the second illumination device (92), the second focusing and collimating device (91), the second half-transmitting and half-reflecting lens (90) and the second camera (89) along an axis, and the photoelectric detector (94) is arranged on a reflection light path of the second half-transmitting and half-reflecting lens (90).
4. The method for testing the core of the multicore optical fiber according to claim 2, wherein the specific implementation manner of the step 1 is as follows:
the first illumination device (86) is started, light emitted by the first illumination device (86) is irradiated on a first end face of the measured multi-core optical fiber (88), the light reflected by the first end face sequentially passes through the first focusing collimation device (85) and the first half-transmitting and half-reflecting lens (84) and then enters the first camera (82), the first automatic three-axis displacement table (87) is controlled to move according to an image collected by the first camera (82), the axial center of the first end face of the measured multi-core optical fiber (88) is aligned with the axial center of the first focusing collimation device (85), and the obtained image of the first end face of the measured multi-core optical fiber (88) is located at the central position of a view field of the first camera (82);
and the second illumination device (92) is started, light emitted by the second illumination device (92) is irradiated on the second end face of the tested multi-core fiber (88), light reflected by the second end face sequentially passes through the second focusing and collimating device (91) and the second half-transmitting and half-reflecting lens (90) and then is incident to the second camera (89), the second automatic three-axis displacement table (93) is controlled to move according to an image collected by the second camera (89), so that the axis center of the second end face of the tested multi-core fiber (88) is aligned with the axis center of the second focusing and collimating device (91), and the obtained image of the second end face of the tested multi-core fiber (88) is located at the central position of the view field of the second camera (89).
5. The method for testing the core of the multicore optical fiber according to claim 2, wherein the specific implementation manner of the step 2 is:
the point light source (96) is started, light emitted by the point light source (96) is reflected by the second semi-transparent semi-reflective lens (90), is coupled into the second end surface of the measured multi-core fiber (88) after passing through the second focusing collimating device (91), the coupled light comes out of the first end surface of the measured multi-core fiber (88), then sequentially passes through the first focusing collimating device (85) and the first semi-transparent semi-reflective lens (84), is incident to the first camera (82), and an image of the first end surface of the measured multi-core fiber (88) is acquired through the first camera (82);
based on the obtained image, the first automatic three-axis displacement table (87) is used for carrying out vertical and horizontal alignment operation, so that a certain fiber core to be measured in the measured multi-core fiber (88) is aligned to the central position of the visual field of the first camera (82), and is aligned to the axial central position of the first focusing collimation device (85).
6. The method for testing cores of a multicore optical fiber according to claim 5, wherein in the step 2, during the process of obtaining the image of the first end surface of the multicore optical fiber (88) to be tested, the second automatic three-axis displacement stage (93) is controlled to move forward or backward along the axial center direction of the second collimating device (91) so that the second end surface of the multicore optical fiber (88) to be tested is at the focal position of the second collimating device (91) to ensure that each core of the multicore optical fiber (88) to be tested has light coming out.
7. The method for testing the core of a multicore optical fiber according to claim 5, wherein the step 2 further comprises: and irradiating the first end face of the multi-core optical fiber (88) to be tested through the first illuminating device (86) to obtain clearer imaging of the end face of the optical fiber.
8. The method for testing the core of the multicore optical fiber according to claim 2, wherein the specific implementation manner of the step 3 is:
the point light source (96) is started, light emitted by the point light source (96) is reflected by the first semi-transparent semi-reflective lens (84), is coupled into the first end face of the measured multi-core fiber (88) after passing through the first focusing collimating device (85), the coupled light comes out of the second end face of the measured multi-core fiber (88), then sequentially passes through the second focusing collimating device (91) and the second semi-transparent semi-reflective lens (90), is incident into the second camera (89), and an image of the second end face of the measured multi-core fiber (88) is acquired by the second camera (89);
and on the basis of the obtained image, performing up-down and left-right alignment operation through the second automatic three-axis displacement table (93), so that a certain core to be tested, which is illuminated in the tested multi-core optical fiber (88), is aligned to the central position of the visual field of the second camera (89), and is aligned to the axial central position of the second focusing and collimating device (91).
9. The method for testing the core of a multicore optical fiber according to claim 8, wherein the step 3 further comprises: and irradiating the second end face of the multi-core optical fiber (88) to be tested by the second illuminating device (92) to obtain clearer imaging of the end face of the optical fiber.
10. The method for testing the core of the multicore optical fiber according to claim 2, wherein the specific implementation manner of the step 4 is:
turning on the wide-spectrum light source (83), wherein light emitted by the wide-spectrum light source (83) passes through the first half-transmitting and half-reflecting lens (84) and the first focusing and collimating device (85) in sequence and then is coupled into a first end face of a multi-core optical fiber (88) to be tested; light comes out from the second end face of the multi-core optical fiber (88) to be detected, then sequentially passes through the second focusing and collimating device (91) and the second semi-transparent and semi-reflective lens (90) and then is transmitted to the second camera (89); and performing geometric parameter test on a certain core to be tested which is illuminated in the multi-core optical fiber (88) to be tested based on the image obtained by the second camera (89).
11. The method for testing the core of the multicore optical fiber according to claim 2, wherein the specific implementation manner of the step 5 is:
turning on the wide-spectrum light source (83), wherein light emitted by the wide-spectrum light source (83) passes through the first half-transmitting and half-reflecting lens (84) and the first focusing and collimating device (85) in sequence and then is coupled into a first end face of a multi-core optical fiber (88) to be tested; light comes out from the second end face of the multi-core optical fiber (88) to be detected, then sequentially passes through the second focusing and collimating device (91) and the second semi-transparent and semi-reflective lens (90) and then is transmitted to the photoelectric detector (94); and based on the light output power of the tested multicore fiber (88) obtained by the photoelectric detector (94), combining with the corresponding wavelength setting in the wide-spectrum light source (83), and performing cut-off wavelength test on a certain core to be tested which is already illuminated in the tested multicore fiber (88).
12. An optical path system for testing the core of a multicore optical fiber, comprising: the device comprises a first camera (82), a wide-spectrum light source (83), a first half-transparent half-reflective lens (84), a first focusing collimation device (85), a first illumination device (86), a first automatic three-axis displacement table (87), a second camera (89), a second half-transparent half-reflective lens (90), a second focusing collimation device (91), a second illumination device (92), a second automatic three-axis displacement table (93), a photoelectric detector (94) and a point light source (96);
the optical path system for testing a multicore fiber core is used for implementing the steps in the method for testing a multicore fiber core according to any of claims 1 to 11.
13. The optical path system for testing the core of a multicore fiber according to claim 12, wherein the wavelength range of the point light source (96) is 800-900 nm; the first lighting device (86) and the second lighting device (92) both adopt ring lamps with the wavelength range of 800-900 nm; the first focusing and collimating device (85) and the second focusing and collimating device (91) both adopt plano-convex lenses.
14. The optical path system for testing the cores of multicore optical fibers according to claim 13, wherein the wavelength of the point light source (96) is 850 nm; the first lighting device (86) and the second lighting device (92) adopt 850nm ring lamps.
15. The optical circuit system for testing the core of a multicore fiber according to claim 12, further comprising: a first mirror (81) and a second mirror (95); the first reflector (81) is arranged on an optical path between the first half mirror (84) and the first camera (82); the second reflecting mirror (95) is arranged on the optical path between the second half-mirror (90) and the photoelectric detector (94); the placement position of the first camera (82) is adjusted by the first mirror (81), and the placement position of the photodetector (94) is adjusted by the second mirror (95).
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