Multi-core optical fiber welding detection device

Abstract

The utility model relates to the technical field of optical fiber welding, in particular to a multi-core optical fiber welding detection device. Comprising a light source, a collimating lens, a polarization-maintaining welding machine, a receiving lens unit and an imaging camera, the collimating lens is arranged on the light emitting side of the light source; the polarization-maintaining welding machine is arranged on the side, away from the light source, of the collimating lens and used for welding the two multi-core optical fibers; the receiving lens unit is arranged on one side, deviating from the collimating lens, of the polarization-maintaining fusion splicer and is used for receiving light beams emitted by the multi-core optical fiber; the imaging camera is arranged on the side, away from the polarization-maintaining welding machine, of the receiving lens unit and used for detecting the light spot size of the light beam. The multi-core optical fiber welding detection device can monitor the alignment precision of the multi-core optical fiber in the welding process of the multi-core optical fiber so as to improve the alignment precision and the welding quality in the welding process of the multi-core optical fiber.

Description

Technical Field

[0001] The utility model relates to the technical field of optical fiber fusion splicing, in particular to a multi-core optical fiber fusion splicing detection device. Background Art

[0002] With the development of communication technology, the industry's demand for communication systems is also increasing. If the demand capacity of information is increased and the information interaction rate is accelerated, further improvement in capacity is required.

[0003] While doubling the capacity without increasing the modulation cost is achieved by the fusion splicing of multi-core optical fibers. The fusion splicing method of multi-core optical fibers requires a large number of cores to be spliced, and the splicing area and scope are large. Therefore, an additional detection device is needed to detect the multi-core optical fiber after splicing, resulting in inconvenient use, which is not conducive to timely alignment correction during the fusion splicing of multi-core optical fibers, and affects the alignment accuracy and splicing quality during the fusion splicing of multi-core optical fibers. Summary of the Utility Model

[0004] The technical problem to be solved by the embodiments of the utility model is to provide a multi-core optical fiber fusion splicing detection device, which can monitor the alignment accuracy of multi-core optical fibers during the fusion splicing process of multi-core optical fibers, so as to improve the alignment accuracy and splicing quality during the fusion splicing of multi-core optical fibers.

[0005] The utility model discloses a multi-core optical fiber fusion splicing detection device, including: a light source, a collimating lens, a polarization-maintaining fusion splicer, a receiving lens unit and an imaging camera. The light source is used for emitting a light beam; the collimating lens is arranged on one side of the light source for emitting light; the polarization-maintaining fusion splicer is arranged on the side of the collimating lens away from the light source, and the polarization-maintaining fusion splicer is used for fusing two multi-core optical fibers; the receiving lens unit is arranged on the side of the polarization-maintaining fusion splicer away from the collimating lens, and is used for receiving the light beam emitted by the multi-core optical fiber; the imaging camera is arranged on the side of the receiving lens unit away from the polarization-maintaining fusion splicer, and is used for detecting the spot size of the light beam.

[0006] Optionally, the collimating lens is a short-focus lens, and the collimating lens is arranged corresponding to the polarization-maintaining fusion splicer, so that one end of the multi-core optical fiber close to the collimating lens is arranged at the waist of the Gaussian beam of the collimating lens.

[0007] Optionally, the collimating lens is an expanding lens, so that after the light beam passes through the collimating lens, the diameter of the spot passing through the collimating lens is greater than or equal to the diameter of the multi-core optical fiber.

[0008] Optionally, the receiving lens unit is a 4F imaging lens group.

[0009] Optionally, the magnification of the receiving lens unit is greater than 2 times.

[0010] Optionally, the band detection range of the imaging camera corresponds to the band of the light source.

[0011] Optionally, the multi-core optical fiber fusion splicing detection device further includes a single-mode optical fiber, and the light source is led out to the collimating lens through the single-mode optical fiber.

[0012] Optionally, the multi-core optical fiber fusion splicing detection device further includes a detector, the imaging camera includes a CCD, and the pixel pitch of the CCD is less than 1 / 10 of the pixel pitch of the multi-core optical fiber after passing through the collimating lens.

[0013] Optionally, the single-pixel size of the CCD is d*d, and:

[0014] d≤L*R

[0015] Wherein, in the formula, L is the adjacent channel pitch of the multi-core optical fiber, d is the single-core size in the multi-core optical fiber, and R is the magnification of the receiving lens unit.

[0016] Optionally, the collimating lens is a spherical lens, and the focal length of the collimating lens is 2 mm to 4 mm.

[0017] Compared with the prior art, the beneficial effects of the multi-core optical fiber fusion splicing detection device provided by the embodiment of the present invention are as follows: The light source can provide a stable light beam for the entire multi-core optical fiber fusion splicing detection device. The stability and intensity of the light source directly affect the light beam transmission and detection quality of the subsequent multi-core optical fiber fusion splicing detection device. The collimating lens is used to adjust the straightness and collimation of the light beam, ensuring the parallelism and focusing of the light beam, which is helpful for the stable transmission of the subsequent light beam and the fusion splicing quality. The polarization-maintaining fusion splicer is used to fuse two multi-core optical fibers, and its function is to maintain the transmission characteristics of the multi-core optical fiber, reduce the loss of optical signals, and ensure the transmission quality and stability of optical signals. The receiving lens unit is used to receive the light beam emitted from the multi-core optical fiber. The receiving lens unit can detect the receiving efficiency of the light beam and the focusing quality of the light beam after the optical signal exits from the multi-core optical fiber, which is directly related to the detection accuracy of the subsequent imaging camera, so as to guide the alignment fusion splicing of the multi-core optical fiber at the polarization-maintaining fusion splicer according to the detection results of the imaging camera. By adopting the above setting method, the position of the multi-core optical fiber can be aligned and corrected during the fusion splicing process of the multi-core optical fiber, ensuring the fusion splicing accuracy and fusion splicing quality of the multi-core optical fiber. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The technical solutions of the present invention will be further described in detail below with reference to the drawings and embodiments. In the drawings:

[0019] Figure 1 is a schematic diagram of the multi-core optical fiber fusion splicing detection device provided by the embodiment of the present invention.

[0020] The reference numerals in the drawings are as follows:

[0021] 1000. Multi-core optical fiber fusion splicing detection device; 100. Light source; 200. Collimating lens; 300. Polarization-maintaining fusion splicer; 400. Receiving lens unit; 500. Imaging camera. Detailed implementation manners

[0022] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Now, in conjunction with the accompanying drawings, the preferred embodiments of the present utility model will be described in detail.

[0023] The embodiment of the present utility model provides a multi-core optical fiber fusion splicing detection device 1000, as Figure 1 shown, the multi-core optical fiber fusion splicing detection device 1000 includes: a light source 100, a collimating lens 200, a polarization-maintaining fusion splicer 300, a receiving lens unit 400 and an imaging camera 500. The light source 100 is used for emitting a light beam; the collimating lens 200 is arranged on one side of the light source 100 where the light exits; the polarization-maintaining fusion splicer 300 is arranged on the side of the collimating lens 200 away from the light source 100, and the polarization-maintaining fusion splicer 300 is used for fusing two multi-core optical fibers; the receiving lens unit 400 is arranged on the side of the polarization-maintaining fusion splicer 300 away from the collimating lens 200, and is used for receiving the light beam emitted from the multi-core optical fiber; the imaging camera 500 is arranged on the side of the receiving lens unit 400 away from the polarization-maintaining fusion splicer 300, and is used for detecting the spot size of the light beam.

[0024] The light source 100 can provide a stable light beam for the entire multi-core optical fiber fusion splicing detection device 1000. The stability and intensity of the light source 100 directly affect the light beam transmission and detection quality of the subsequent multi-core optical fiber fusion splicing detection device 1000. The collimating lens 200 is used to adjust the straightness and collimation of the light beam, ensuring the parallelism and focusing of the light beam, which is helpful for the stable transmission of the subsequent light beam and the fusion splicing quality. The polarization-maintaining fusion splicer 300 is used for fusing two multi-core optical fibers, and its function is to maintain the transmission characteristics of the multi-core optical fiber, reduce the loss of the optical signal, and ensure the transmission quality and stability of the optical signal. The receiving lens unit 400 is used for receiving the light beam emitted from the multi-core optical fiber. The receiving lens unit 400 can detect the receiving efficiency of the light beam and the focusing quality of the light beam after the optical signal exits from the multi-core optical fiber, which is directly related to the detection accuracy of the subsequent imaging camera 500, so as to guide the alignment fusion splicing of the multi-core optical fiber at the polarization-maintaining fusion splicer 300 according to the detection result of the imaging camera 500. By adopting the above setting method, the position of the multi-core optical fiber can be corrected during the fusion splicing process of the multi-core optical fiber, ensuring the fusion splicing accuracy and fusion splicing quality of the multi-core optical fiber.

[0025] Specifically, the above setting method of the detection device during the fusion splicing of the multi-core optical fiber is relatively simple and convenient. Therefore, the multi-core optical fiber fusion splicing detection device 1000 is beneficial to actual production, can reduce the detection cost of the fusion splicing effect of the multi-core optical fiber during the fusion splicing process, and improve the detection efficiency.

[0026] Specifically, the polarization-maintaining fusion splicer 300 can ensure that the transmission characteristics of the multi-core optical fiber are maintained during the fusion splicing process. It can ensure that the position and geometric relationship of each core in the multi-core optical fiber bundle are minimally affected, so that the transmission of the optical signal in the multi-core optical fiber after fusion splicing is not interfered, ensuring the stability and reliability of data transmission.

[0027] Specifically, through precise alignment and fusion splicing, the polarization-maintaining fusion splicer 300 can maintain the single-mode characteristics of the light beam. Maintaining the single-mode characteristics of the light beam can reduce the distortion and cross-interference of the optical signal, ensuring the accuracy and stability of data transmission.

[0028] It should be noted that in this embodiment, the light source 100 is an ASE light source. The ASE (Amplified Spontaneous Emission) light source 100 is a broad-spectrum continuous light source 100, which is usually used in optical communication, band analysis and other optical applications. The light generated by the ASE light source is generated by amplified spontaneous emission and has broadband and continuous band characteristics. The ASE light source has characteristics such as a wide band, high power and high stability.

[0029] In an alternative embodiment of the present utility model, the collimating lens 200 is a short-focus lens. The collimating lens 200 is correspondingly arranged with the polarization-maintaining fusion splicer 300, so that one end of the multi-core optical fiber close to the collimating lens 200 is arranged at the waist of the Gaussian beam of the collimating lens 200.

[0030] Using a short-focus lens as the collimating lens 200 can better focus the light beam to the waist of the Gaussian beam, which helps to improve the focusing effect and collimation of the light beam. The short-focus lens can reduce the loss of the light beam during transmission and improve the transmission efficiency of the light beam.

[0031] Specifically, arranging one end of the multi-core optical fiber close to the collimating lens 200 at the waist of the Gaussian beam helps to optimize the transmission effect and stability of the light beam. The waist of the Gaussian beam has the smallest beam diameter and the largest light intensity. Placing the multi-core optical fiber at this position can maximize the advantages of the Gaussian beam and ensure the stability and transmission quality of the light beam.

[0032] Specifically, correspondingly arranging the collimating lens 200 with the polarization-maintaining fusion splicer 300 can maintain the continuity of the optical path and avoid unnecessary deflection or loss of the light beam during transmission.

[0033] It should be noted that in this embodiment, the collimating lens 200 is a short-focus lens. A short-focus lens generally refers to a lens with a relatively short focal length. The focal length of a short-focal-length lens is relatively short and is usually used to focus light to a relatively short distance. Due to the short focal length, a short-focal-length lens has a strong focusing ability and is suitable for applications that require high focusing. Short-focal-length lenses are often used in applications such as close-range imaging, magnification, and observation, and can effectively magnify the target object and focus it on the imaging plane.

[0034] A Gaussian beam is a special type of beam whose intensity distribution conforms to the Gaussian function or normal distribution. The intensity distribution of a Gaussian beam shows the characteristic of being brightest at the center and gradually decreasing towards both sides, conforming to the curve shape of the Gaussian function. Therefore, the intensity is relatively strong at the beam waist of the Gaussian beam, that is, the position with the maximum intensity in the Gaussian beam is called the beam waist (walst). At the beam waist of the Gaussian beam, the beam diameter is the smallest and the intensity is the largest.

[0035] Specifically, a Gaussian beam will exhibit the characteristic of self-focusing during free propagation, that is, the position of the beam waist will be adjusted as the propagation distance changes to maintain the focusing performance of the beam.

[0036] In an alternative embodiment of the present utility model, the collimating lens 200 is an expanding lens, so that after the beam passes through the collimating lens 200, the diameter of the light spot passing through the collimating lens 200 is greater than or equal to the diameter of the multi-core optical fiber.

[0037] Since the collimating lens 200 is an expanding lens, the diameter of the beam can be made greater than or equal to the diameter of the multi-core optical fiber after passing through the collimating lens 200, which can ensure that the beam completely covers the cross-section of the multi-core optical fiber and reduce the loss of the beam during transmission. In the multi-core optical fiber fusion splicing detection device 1000, the expanding lens can ensure that the beam maintains single-mode characteristics, which helps to maintain the stability and transmission performance of the beam. By making the beam diameter greater than or equal to the diameter of the multi-core optical fiber, the alignment accuracy between the collimating lens 200 and the multi-core optical fiber can be improved, ensuring that the beam can be effectively transmitted into the multi-core optical fiber. The expanding lens design can enhance the focusing ability of the beam, enabling the beam to be better focused on the input end of the multi-core optical fiber and improving the transmission efficiency and performance of the multi-core optical fiber fusion splicing detection device 1000.

[0038] It should be noted that an expanding lens is used to expand or adjust the diameter of the beam. The main function of an expanding lens is to expand the diameter of the beam so that it can cover a larger area or adapt to optical elements with a larger diameter. The expanding lens can adjust the diameter of the beam to meet the requirements of the multi-core optical fiber fusion splicing detection device 1000.

[0039] In an alternative embodiment of the present utility model, the receiving lens unit 400 adopts a 4F imaging lens group.

[0040] Using a 4F imaging lens group as the receiving lens unit 400 can achieve high-precision optical imaging. Since the lenses in the 4F imaging lens group process the light beam at its focal length, high resolution and clarity of the imaging can be maintained. The 4F imaging lens group has good stability, which can reduce aberration and distortion in the multi-core fiber splicing detection device 1000, thereby improving the stability and reliability of the multi-core fiber splicing detection device 1000. The 4F imaging lens group can help eliminate some aberration and distortion in the multi-core fiber splicing detection device 1000, maintain the accuracy and authenticity of the imaging, and contribute to obtaining accurate detection data.

[0041] It should be noted that the 4F imaging lens group is composed of two lenses with equal focal lengths, and the distance between them is 4 times their focal lengths. The first lens focuses the input light beam to the focal point. When the distance between the two lenses is 4 times the focal lengths of the two lenses, this distance can achieve the transformation of spatial frequency. The second lens focuses the light beam again to form an image.

[0042] In an alternative embodiment of the present utility model, the magnification of the receiving lens unit 400 is greater than 2 times.

[0043] When the magnification of the receiving lens unit 400 is greater than 2 times, it means that the light beam will be magnified to more than twice its original size after passing through the receiving lens unit 400. After the light beam is magnified by the receiving lens unit 400, the intensity of the optical signal can be enhanced. The magnification of the receiving lens unit 400 being greater than 2 times can improve the imaging resolution. When the light beam is magnified and then transmitted to the imaging camera 500, fine details and structures can be captured and displayed more clearly, thereby improving the clarity and accuracy of the imaging of the multi-core fiber splicing detection device 1000.

[0044] Specifically, during the transmission of the optical signal, the magnification of the receiving lens unit 400 being greater than 2 times can reduce the loss of the optical signal. By magnifying the light beam, the optical signal can be transmitted more effectively, reducing the scattering and loss of the light beam, and improving the capture efficiency and detection accuracy of the optical signal.

[0045] In an alternative embodiment of the present utility model, the band detection range of the imaging camera 500 corresponds to the band of the light source 100.

[0046] The band range emitted by the light source 100 corresponds to the band detection range of the imaging camera 500, ensuring that the imaging camera 500 can effectively capture and process the signal emitted by the light source 100, improving the accuracy and reliability of the imaging. The band emitted by the light source 100 can be accurately analyzed and detected through the imaging camera 500, which helps to obtain more accurate information about the optical signal emitted by the light source 100, ensuring that the imaging result is clearer and more accurate, and improving the performance and reliability of the multi-core fiber splicing detection device 1000.

[0047] Furthermore, in an alternative embodiment of the present utility model, the imaging camera 500 includes a CCD, and the pixel pitch of the CCD is less than 1 / 10 of the pixel pitch of the multi-core optical fiber after passing through the receiving lens unit 400.

[0048] When the sensing band of the CCD matches the band of the light source 100, it can ensure that the CCD of the imaging camera 500 can effectively receive and detect the optical signal from the light source 100. The matching of the sensing band of the CCD with the band of the light source 100 helps to improve the sensitivity and accuracy of the detector to the optical signal, thereby improving the detection accuracy and reliability.

[0049] On the other hand, the pixel pitch of the CCD is less than 1 / 10 of the pixel pitch of the multi-core optical fiber after passing through the collimating lens 200, which means that the pixels of the CCD are more dense. Such a design helps to improve the imaging resolution and detail capture ability, enabling the detector to more accurately capture and record the subtle changes of the optical signal.

[0050] Specifically, the above design helps to improve the imaging quality. By ensuring the matching of the sensing band of the CCD with the band of the light source 100, the capture efficiency of the optical signal can be maximized. And the dense pixel pitch can improve the details and clarity of the imaging, enabling the detector to more accurately reproduce the characteristics of the optical signal.

[0051] In an alternative embodiment of the present utility model, the multi-core optical fiber fusion detection device 1000 further includes a single-mode optical fiber, and the light source 100 is led out to the collimating lens 200 through the single-mode optical fiber.

[0052] The single-mode optical fiber can effectively transmit the optical signal, reduce the loss of the optical signal during transmission, ensure that the light beam generated by the light source 100 can efficiently reach the collimating lens 200, and improve the optical transmission efficiency of the entire multi-core optical fiber fusion detection device 1000.

[0053] Specifically, the single-mode optical fiber has a small mode field diameter, can maintain the single-mode characteristic of the light beam, reduce the transmission mode distortion of the light beam, ensure the stability and collimation of the light beam, and is beneficial to the subsequent processing and analysis of the light beam.

[0054] Specifically, the single-mode optical fiber can effectively suppress multi-mode interference, reduce the influence of environmental factors on the optical signal, improve the anti-interference ability of the multi-core optical fiber fusion detection device 1000, and ensure the stability and accuracy of the light beam.

[0055] It should be noted that a single-mode fiber is a multi-core fiber with a relatively small core diameter, usually in the range of several micrometers. Due to the small core diameter of the single-mode fiber, light travels in a straighter path, reducing modal dispersion in multi-mode multi-core fibers. Therefore, single-mode fibers can transmit over longer distances while maintaining high signal quality. During the transmission of light, single-mode fibers reduce the mutual interference between modes, resulting in lower optical signal loss and more stable and reliable signal transmission. They also have the characteristics of strong anti-interference ability, high optical coupling efficiency, and relatively wide frequency bandwidth.

[0056] In an alternative embodiment of the present invention, the single-pixel size of the CCD corresponding to the imaging camera 500 is d*d, and: d ≤ L*R

[0057] Wherein, in the formula, L is the adjacent channel spacing of the multi-core fiber, d is the single-core size within the multi-core fiber, and R is the magnification of the receiving lens unit 400.

[0058] According to the information you provided, the single-pixel size of the CCD corresponding to the imaging camera 500 is d*d, and it satisfies the condition d ≤ L*R. According to the above-given conditions: L is the adjacent channel spacing of the multi-core fiber, d is the single-core size within the multi-core fiber, and R is the magnification of the receiving lens unit 400. Therefore, d ≤ L*R can be understood as the diameter of a single core not exceeding 1 times the magnification of the receiving lens unit 400. This condition ensures the relationship between the single-pixel size of the optical imaging CCD of the imaging camera 500 and the size of a single core within the multi-core fiber.

[0059] It should be noted that the CCD (Charge-Coupled Device) corresponding to the imaging camera 500 is a semiconductor device commonly used in imaging and optoelectronic detection. A CCD is usually composed of many pixels, and each pixel can convert an optical signal into an electric charge and convert the electric charge into a digital signal by row-by-row reading for image capture and processing. In the multi-core fiber fusion detection device 1000, the CCD is responsible for converting the optical signal into a digital signal for subsequent processing and analysis.

[0060] In an alternative embodiment of the present invention, the collimating lens 200 is a spherical lens, and the focal length of the collimating lens 200 is 2 mm to 4 mm.

[0061] The collimating lens 200 is a spherical lens so that the focal length of the collimating lens 200 is between 2 mm and 4 mm, enabling the multi-core fiber fusion detection device 1000 to adjust the focal length according to specific requirements to obtain the best imaging effect. This flexibility can help optimize the imaging quality and signal capture efficiency.

[0062] Since the focal length range is from 2 mm to 4 mm, the multi-core fiber fusion detection device 1000 has a certain degree of flexibility and can be adjusted and optimized according to specific application requirements. This flexibility helps to meet the requirements of optical signal capture and processing in different scenarios, improving the applicability and reliability of the multi-core fiber fusion detection device 1000.

[0063] It should be noted that a spherical lens is a lens with a spherical curvature, and its curved surface shape is spherical. Spherical lenses are commonly used in optical systems to focus or diverge light, change the propagation direction of light, or adjust the focal length, etc. In the multi-core fiber fusion detection device 1000, the spherical lens can focus the emitted light from the multi-core fiber onto a point, thus forming a clear image. By adjusting the curvature and position of the spherical lens, the focusing effect of the light can be controlled to ensure that the light is correctly focused on the CCD. By selecting an appropriate focal length of the spherical lens, the focusing effect and focal length of the light can be adjusted to meet specific imaging and detection requirements. In the multi-core fiber fusion detection device 1000, adjusting the focal length of the spherical lens can optimize the imaging quality and system performance.

[0064] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. For those skilled in the art, the technical solutions described in the above embodiments can be modified, or some of the technical features can be equivalently replaced; and all such modifications and replacements should fall within the protection scope of the appended claims of the present invention.

Claims

1. A multi-core optical fiber fusion splicing detection device, characterized in that, include: A light source, the light source is used to emit a light beam; A collimating lens, the collimating lens being arranged on a side where the light source emits light; A polarization-maintaining fusion splicer, which is arranged on a side of the collimating lens away from the light source and is used for fusing two multi-core optical fibers; A receiving lens unit, which is disposed on a side of the polarization-maintaining fusion splicer away from the collimating lens and is used to receive the light beam emitted by the multi-core optical fiber; An imaging camera is arranged on a side of the receiving lens unit away from the polarization-maintaining welding machine, and is used to detect the spot size of the light beam.

2. The multi-core optical fiber fusion splicing detection device according to claim 1, characterized in that, The collimating lens is a short-focus lens, and the collimating lens is arranged corresponding to the polarization-maintaining fusion splicer so that one end of the multi-core optical fiber close to the collimating lens is arranged at the waist of the Gaussian beam of the collimating lens.

3. The multi-core optical fiber fusion splicing detection device according to claim 2, wherein, The collimating lens is a beam expanding lens, so that after the light beam passes through the collimating lens, the diameter of the light spot passing through the collimating lens is greater than or equal to the diameter of the multi-core optical fiber.

4. The multi-core optical fiber fusion splicing detection device according to claim 1, wherein, The receiving lens unit adopts a 4F imaging lens group.

5. The multi-core optical fiber fusion splicing detection device according to claim 4, characterized in that, The magnification of the receiving lens unit is greater than 2 times.

6. The multi-core optical fiber fusion splicing detection device according to claim 1, wherein, The wavelength detection range of the imaging camera corresponds to the wavelength of the light source.

7. The multi-core optical fiber fusion splicing detection device according to claim 1, wherein, The multi-core optical fiber fusion detection device further comprises a single-mode optical fiber, and the light source is led out to the collimating lens through the single-mode optical fiber.

8. The multi-core optical fiber fusion splicing detection device according to claim 6, characterized in that, The imaging camera comprises a CCD, and a pixel pitch of the CCD is smaller than 1 / 10 of a pixel pitch of the multi-core optical fiber after passing through the receiving lens unit.

9. The multi-core optical fiber fusion splicing detection device according to claim 8, characterized in that, The single pixel size of the CCD is d*d, and: d≤L*R Wherein, L is the distance between adjacent channels of the multi-core optical fiber, d is the size of a single core in the multi-core optical fiber, and R is the magnification of the receiving lens unit.

10. The multi-core optical fiber fusion splicing detection device according to claim 1, characterized in that, The collimating lens is a spherical lens, and the focal length of the collimating lens is 2 mm to 4 mm.

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