CN104181645A - Calibrating tool, calibrating method, fiber inserting assembly and fiber connector - Google Patents

Abstract

The invention discloses a calibration tool for calibrating the position of an optical fiber in the inner hole of an optical fiber ferrule, wherein the calibration tool includes a high-precision outer diameter alignment component and a high-precision fiber position calibration component, and the high-precision outer The radial alignment component is used to align the outer cylinder of the fiber ferrule with the outer cylinder of the fiber position high-precision calibration component; one end of the fiber passes through the inner hole of the fiber ferrule and is inserted into the fiber position high-precision calibration component In the calibration hole, it is used to align the axis of the optical fiber inserted into the inner hole of the fiber ferrule with the central axis determined by the outer cylinder of the fiber ferrule, so that a high-precision fiber connection can be made with a low-precision fiber ferrule devices, reducing manufacturing costs. The invention also discloses a calibration method, and a high-precision optical fiber connector manufactured by the calibration tool and the calibration method with a precision reaching or exceeding a single-mode optical fiber connector.

Description

Calibration tools, calibration methods, fiber optic ferrule assemblies and fiber optic connectors

technical field

The invention belongs to the field of optical fiber connectors. The invention relates to a method for calibrating optical fibers (including conventional single-core optical fibers, multi-core single fibers, bundled multi-fibers or multi-fiber bundles. The "fiber" mentioned in this document has the same The calibration tool and calibration method for the position in the inner hole of the optical fiber ferrule, as well as the optical fiber ferrule assembly and the optical fiber connector manufactured by the calibration tool and calibration method. Specifically, the present invention proposes a low-precision ferrule (with a larger inner hole diameter and eccentricity, such as a multi-mode ferrule or a lower-required specification than a multi-mode ferrule) to manufacture low-cost, high-performance ferrules. (low insertion loss), easy-to-operate new process technology of single-mode optical fiber connectors, completely changed the single-mode optical fiber connectors must use high-precision ferrule (the more ultra-low loss connectors, the more expensive and ultra-high Precision single-mode ferrule) prior art solutions.

Background technique

The ferrule applied to the optical fiber connector is also called the ferrule body. The ferrule is the core component of the optical fiber connector, and it is a high-precision component made by precision machining technology. In the manufacturing process of optical fiber connectors, the stripped and cleaned bare optical fiber is usually passed through the inner hole filled with glue, and then the glue is cured to fix the optical fiber in the ferrule, and then through a series of procedures such as grinding, polishing, testing, etc. Make the required optical fiber connection device. Due to the inevitable errors in all manufacturing processes and artificially introduced tolerances for dimensional fit/assembly needs, for example, the diameter of the inner hole is larger than the outer diameter of the fiber so that the fiber can pass into the inner hole, so the outer diameter of the fiber and the size of the inner hole Inherent deviation is required. Another example is that the axis of the optical fiber and the inner hole are not concentric due to the gap, and the inner hole and the alignment reference (for connectors whose outer circle is used as the alignment reference, it mainly refers to the outer diameter of the ferrule) There are manufacturing errors, etc., and these factors will cause the axial center of the optical fiber to shift laterally, thereby affecting the insertion loss when the optical fiber connector is mated.

Since the mode field diameter of single-mode fiber is much smaller than that of multimode fiber (for most communication fibers, it is roughly 1/5 to 1/6, for example, the standard single-mode fiber The typical diameter of the core is about 9 μm, and the diameter of the core of a standard multimode fiber is generally 50 μm or 62.5 μm), therefore, the alignment accuracy requirements for single-mode fibers are much higher than those for multimode fibers In this way, the precision of the ferrule used by the single-mode fiber optic connector is much higher than that used by the multimode fiber optic connector.

The relevant dimensional requirements of the single-mode ferrule for the ferrule are mainly in the diameter of the inner hole of the ferrule and the concentricity between the inner hole of the ferrule and the outer cylinder. The following will compare the single-mode ferrule and the multi-mode ferrule Dimensional accuracy requirements in the following aspects:

1) Dimensional tolerance of the diameter of the outer cylinder of the ferrule

Single mode: the diameter tolerance of the outer cylinder of the ferrule is required to reach +/-0.0005mm, that is, -0.0005mm～0.0005mm;

Multi-mode: The typical tolerance of the diameter of the outer cylinder of the ferrule is required to reach +/-0.001mm, that is, -0.001mm～0.001mm.

2) Diameter of inner hole of ferrule:

Single-mode: The diameter tolerance of the inner hole of the ferrule is 0.000-0.001mm, and the inner hole size of the low-loss single-mode ferrule is even required to be 0.0000-0.0005mm;

Multi-mode: The typical tolerance of the inner hole diameter of the ferrule is 0.000-0.004mm.

3) Requirements for the concentricity between the optical fiber and the outer cylinder:

Single-mode: the concentricity is generally required to reach 0.001mm, and for low-loss single-mode ferrules, the concentricity requirement even reaches 0.0005mm;

Multi-mode: the concentricity is generally required to reach 0.004mm.

In order to ensure that the single-mode fiber optic connector meets the requirements of relevant industry standards during the manufacturing process, in the field of fiber optic connector manufacturing, ferrules with different precision requirements are usually used for single-mode and multi-mode fibers, that is, for multi-mode fiber optic connectors. Ferrules and single-mode fiber optic connectors are distinguished by ferrules. The single-mode/multi-mode ferrules used in fiber optic connectors seem to have the same appearance and structure, but the single-mode ferrules have high requirements on the relative dimensions of the ferrules, especially the concentricity between the inner diameter of the ferrule and the outer cylinder The precision requirements are extremely high (usually within 1.5 microns, in order to meet the ultra-low insertion loss of the butt connection, the precision must even be controlled at the sub-micron level - less than 1 micron), the most direct result of the high precision requirements is that the single-mode ferrule The high cost/price leads to the high cost of single-mode connectors, especially for ultra-low loss connectors, and the cost of the ferrule is almost doubled.

Therefore, in the prior art, a low-precision ferrule (for example, a precision equal to or lower than that of a multimode ferrule) cannot be used to manufacture a high-precision single-mode optical fiber connector.

Contents of the invention

The purpose of the present invention is to solve at least one aspect of the above-mentioned problems and deficiencies in the prior art.

One object of the present invention is to provide a calibration tool for calibrating the position of the optical fiber in the low-precision fiber ferrule, which can improve the position accuracy of the optical fiber in the inner hole of the fiber ferrule, making it reach or exceed the The positional accuracy in the inner hole of the mold insert.

Another object of the present invention is to provide a calibration method for calibrating the position of the optical fiber in the low-precision fiber ferrule, which can improve the position accuracy of the optical fiber in the inner hole of the fiber ferrule, making it reach or exceed the Positional accuracy in the bore of a singlemode ferrule.

According to one aspect of the present invention, a calibration tool is provided for calibrating the position of the optical fiber in the inner hole of the fiber ferrule, wherein the calibration tool includes a high-precision outer diameter alignment component and a high-precision fiber position calibration component, The high-precision outer diameter alignment element is used to align the outer cylinder of the optical fiber ferrule with the outer cylinder of the optical fiber position high-precision calibration element; one end of the optical fiber passes through the inner hole of the optical fiber ferrule and is inserted into the optical fiber The calibration hole of the high-precision calibration component is used to align the axis of the optical fiber inserted into the inner hole of the fiber ferrule with the central axis defined by the outer cylinder of the fiber ferrule.

According to an exemplary embodiment of the present invention, the accuracy of the fiber optic ferrule is equal to or lower than that of a standard multimode ferrule; and the accuracy of the optical fiber position high-precision calibration component is equal to or higher than that of a standard single-mode ferrule core precision.

According to another exemplary embodiment of the present invention, the high-precision outer diameter alignment element is a high-precision alignment sleeve tool, the optical fiber position high-precision alignment element is inserted from one end of the high-precision outer diameter alignment element, and The fiber ferrule is inserted into the high-precision outer diameter alignment component from the other end, and after insertion, the central axis defined by the outer cylinder of the fiber ferrule and the center defined by the outer cylinder of the high-precision calibration component Axis alignment.

According to another exemplary embodiment of the present invention, the high-precision outer diameter alignment element is an integral element formed by only one component.

According to another exemplary embodiment of the present invention, the high-precision outer diameter alignment element is a split element formed by at least two independent parts.

According to another exemplary embodiment of the present invention, the high-precision outer diameter alignment element includes: a base, a notch is formed in the base, and a positioning groove is formed on the bottom wall of the notch; and a top pressing block, the top pressing block is placed in the notch of the base, and is used to keep the optical fiber position high-precision calibration component in the positioning groove.

According to another exemplary embodiment of the present invention, the positioning groove is a V-shaped positioning groove or a U-shaped positioning groove.

According to another exemplary embodiment of the present invention, the optical fiber position high-precision calibration component is an ultra-precision ferrule tool with a precision higher than that of a standard single-mode ferrule.

According to another exemplary embodiment of the present invention, the optical fiber position high-precision calibration component inserted into the high-precision outer diameter alignment component is separated from the end face of the fiber ferrule by a predetermined distance.

According to another exemplary embodiment of the present invention, the part of the optical fiber inserted into the calibration hole of the optical fiber position high precision calibration component has a predetermined length.

According to another exemplary embodiment of the present invention, the calibration tool further includes: a holder for fixedly holding the high-precision outer diameter alignment component and the high-precision fiber position calibration component.

According to another exemplary embodiment of the present invention, the high-precision outer diameter alignment element and the high-precision optical fiber position alignment element are detachably fixed on the holder.

According to another exemplary embodiment of the present invention, the high-precision outer diameter alignment element and the high-precision optical fiber position alignment element are configured as separate components, or are configured as a single piece.

According to another exemplary embodiment of the present invention, the calibration tool further includes: an interval control member, disposed between the holder and the rear seat of the fiber ferrule or disposed inside the high-precision outer diameter alignment element, for The distance between the optical fiber position high-precision calibration component inserted into the high-precision outer diameter alignment component and the end face of the fiber ferrule is controlled.

According to another exemplary embodiment of the present invention, the calibration tool further includes: an optical fiber ferrule extractor, which is sleeved on the rear seat of the optical fiber ferrule, and is used for removing the optical fiber ferrule assembly after the optical fiber is calibrated and fixed.

According to another exemplary embodiment of the present invention, the interval control member and the optical fiber ferrule or component extractor are configured as separate components, or are configured as one piece.

According to another exemplary embodiment of the present invention, the optical fiber position high-precision calibration component is an integral component formed by only one component, and the calibration hole is a circular hole or a characteristic hole conforming to the special shape of the optical fiber . According to another exemplary embodiment of the present invention, the high-precision optical fiber position calibration component is a split component formed by at least two independent components.

According to another exemplary embodiment of the present invention, the optical fiber position high-precision calibration component includes: a base, a notch is formed in the base, and a calibration hole is formed on the bottom wall of the notch; and a pressing block , the pressing block is placed in the notch of the base for holding the optical fiber inserted into the alignment hole in the alignment hole.

According to another exemplary embodiment of the present invention, the calibration hole is a U-shaped slot or a V-shaped slot.

According to another aspect of the present invention, there is provided a calibration method for calibrating the position of an optical fiber in an inner hole of a fiber ferrule, the method comprising the steps of:

S100: Provides a stand-alone alignment tool with higher accuracy than the fiber optic ferrule; and

S200: Use a calibration tool to calibrate the position of the optical fiber in the inner hole of the optical fiber ferrule.

According to an exemplary embodiment of the present invention, the calibration tool is the aforementioned calibration tool.

According to another exemplary embodiment of the present invention, the step S200 includes the following steps:

S201: Align the outer cylinder of the fiber ferrule with the outer cylinder of the fiber position high-precision calibration element using a high-precision outer diameter alignment element; and

S200: Insert one end of the optical fiber passing through the inner hole of the fiber ferrule into the calibration hole of the fiber position high-precision calibration component, which is used to align the axis of the optical fiber inserted into the inner hole of the fiber ferrule with the outer cylinder of the fiber ferrule The determined central axis is aligned.

According to another exemplary embodiment of the present invention, a spacing control member is provided between the holder and the rear seat of the fiber ferrule or inside the high-precision outer diameter alignment element for controlling the insertion of the high-precision outer diameter Alignment Component Fiber Position Highly calibrates the distance between the component and the end face of the fiber ferrule.

According to another exemplary embodiment of the present invention, the optical fiber position high-precision calibration component inserted into the high-precision outer diameter alignment component is separated from the end face of the fiber ferrule by a predetermined distance.

According to another exemplary embodiment of the present invention, the part of the optical fiber inserted into the calibration hole of the optical fiber position high precision calibration component has a predetermined length.

According to another exemplary embodiment of the present invention, the inner hole of the optical fiber ferrule is filled with glue or an equivalent curable body for fixing the optical fiber in the inner hole of the optical fiber ferrule, so The glue is filled into the inner hole of the fiber optic ferrule before or after the optical fiber is inserted into the inner hole of the fiber optic ferrule.

According to another exemplary embodiment of the present invention, after step S200, further steps are included:

S300: curing the glue to fix the optical fiber in the optical fiber ferrule.

According to another aspect of the present invention, there is provided a fiber optic ferrule assembly, including a fiber optic ferrule and an optical fiber located in an inner hole of the fiber optic ferrule, the precision of the fiber optic ferrule is equal to or lower than that of a standard multimode ferrule The optical fiber ferrule assembly is made using the aforementioned calibration tool and/or the aforementioned calibration method, and the position accuracy of the optical fiber in the ferrule of the manufactured optical fiber ferrule assembly reaches or exceeds that of a standard single-mode optical fiber ferrule assembly. Positional accuracy in the core.

According to another exemplary embodiment of the present invention, after calibration, the axis center deviation between the optical fiber inserted into the inner hole of the optical fiber ferrule and the outer cylinder of the optical fiber ferrule is at sub-micron level.

According to another exemplary embodiment of the present invention, the diameter tolerance of the outer cylinder of the optical fiber ferrule is -0.001mm˜0.001mm.

According to another exemplary embodiment of the present invention, the diameter tolerance of the inner hole of the optical fiber ferrule is 0.000-0.030 mm.

According to another exemplary embodiment of the present invention, the diameter tolerance of the outer cylinder of the optical fiber ferrule is -0.001 mm to 0.001 mm, and the diameter tolerance of the inner hole of the optical fiber ferrule is 0.000 to 0.030 mm .

According to another exemplary embodiment of the present invention, after the optical fiber is fixed in the inner hole of the optical fiber ferrule by glue, the maximum distance between the inner wall surface of the inner hole of the optical fiber ferrule and the outer peripheral surface of the optical fiber greater than or equal to the eccentric distance between the axis of the optical fiber and the axis of the outer cylinder of the fiber ferrule.

According to another aspect of the present invention, an optical fiber connector is provided, and the optical fiber connector includes the foregoing optical fiber ferrule assembly.

According to another aspect of the present invention, there is provided an optical fiber connector, including a low-precision fiber optic ferrule with a precision equal to or lower than that of a standard multimode ferrule, wherein, during the manufacturing process, the aforementioned calibration tool and/or the aforementioned calibration The method calibrates the position of the optical fiber in the inner hole of the low-precision optical fiber ferrule, so that the position accuracy of the optical fiber in the inner hole of the low-precision optical fiber ferrule reaches or exceeds that of the optical fiber in the inner hole of the standard single-mode ferrule positional accuracy, and after alignment, the fiber is secured within a low-precision fiber ferrule so that the accuracy of the manufactured fiber optic connector meets or exceeds that of standard single-mode fiber optic connectors.

According to an exemplary embodiment of the present invention, the optical fiber is a conventional single-core optical fiber.

According to another exemplary embodiment of the present invention, the optical fiber is a multi-core optical fiber including multiple cores.

According to another exemplary embodiment of the present invention, the optical fiber is a bundled optical fiber comprising a plurality of optical fibers.

The difference between the present invention and the prior art is that the single-mode optical fiber is placed in the inner hole of the low-precision fiber ferrule, and the gap between the inner hole of the low-precision ferrule and the optical fiber can be much larger than that used in the prior art. The gap between the high-precision single-mode ferrule and the optical fiber (the gap is filled with glue or equivalent curing body and cured to fix the optical fiber in the inner hole), and the fiber head protruding from the end face of the ferrule is guided into an independent high-precision In the calibration hole of the optical fiber position high-precision calibration component, the position of the optical fiber in the low-precision fiber ferrule is precisely calibrated, and it is fixed in the low-precision fiber ferrule in production, thereby producing a high-precision connector.

Based on the breakthrough technology and tools of the invention, it is possible to use low-precision ferrule components to manufacture high-performance (low insertion loss) and low-cost single-mode optical fiber connectors. Compared with the existing connectors made of high-precision ferrules, the optical fiber connector made based on the technology of the invention has better controllability, predictability, and individual-to-individual precision repeatability of the position accuracy of the optical fiber in production. Reproducibility, which greatly improves the performance and random intermating of the connector (low insertion loss and low random intermating insertion loss).

For this type of fiber optic connector based on the ferrule with the outer cylinder as the alignment reference, the most basic functions of the high-precision calibration tool include high-precision outer diameter alignment elements (such as high-precision outer diameter alignment component tools) and The optical fiber position high-precision calibration element (such as ultra-precision ferrule tool) is composed of two parts, which are used to align the outer cylinder of the fiber ferrule and calibrate the position of the optical fiber in the inner hole, so that the deviation of the physical axis of the two can be reduced. to the submicron level.

The above-mentioned two-part feature can be assembled into a tool kit by two or more parts, and can also be designed as an integrated tool piece.

The invention realizes the production of low-cost and low-loss high-quality single-mode optical fiber connection devices by using a low-precision ferrule (the precision is equal to or lower than that of a multi-mode ferrule) by using a new process technology.

Other objects and advantages of the present invention will be apparent from the following description of the present invention with reference to the accompanying drawings, and may help to provide a comprehensive understanding of the present invention.

Description of drawings

FIG. 1 is a schematic diagram of a calibration tool for manufacturing an optical fiber ferrule according to an exemplary embodiment of the present invention;

Fig. 2 is a schematic diagram of the calibration tool shown in Fig. 1, wherein the holder, interval control member and fiber ferrule extractor of the calibration tool are shown;

Fig. 3 is a sectional view of the calibration tool shown in Fig. 1;

Figure 4 shows a cross-sectional view of another variant of the calibration tool;

Figure 5 shows a cross-sectional view of yet another variant of the calibration tool;

Figure 6 shows a schematic diagram of a calibration tool according to another exemplary embodiment of the present invention;

Figure 7 shows a cross-sectional view of the calibration tool in Figure 6;

Figure 8 shows a cross-sectional view of a calibration tool according to yet another exemplary embodiment of the present invention;

Figure 9 shows a cross-sectional view of an optical fiber ferrule assembly manufactured by the method of the present invention;

Figure 10 shows a schematic diagram of another optical fiber according to the present invention;

Figure 11 shows a perspective view of a plurality of loose optical fibers;

Figure 12 shows an end view of the plurality of loose optical fibers in Figure 11;

Figure 13 shows a schematic perspective view of a bundled optical fiber formed after a plurality of loose optical fibers in Figures 11 and 12 are calibrated in the alignment hole of the present invention; and

FIG. 14 shows an end view of the bundled optical fiber formed after alignment in FIG. 13. FIG.

Detailed ways

The technical solutions of the present invention will be further specifically described below through the embodiments and in conjunction with the accompanying drawings. In the specification, the same or similar reference numerals designate the same or similar components. The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the general inventive concept of the present invention, but should not be construed as a limitation of the present invention.

Fig. 1 is a schematic diagram of a calibration tool for manufacturing an optical fiber ferrule according to an exemplary embodiment of the present invention; Fig. 2 is a schematic diagram of the calibration tool shown in Fig. 1, wherein the calibration tool holder 500, interval control Part 610 and fiber ferrule extractor 600.

As shown in FIGS. 1 and 2 , the calibration tool is used to calibrate the position of the optical fiber 400 in the inner hole of the fiber ferrule 300 . The calibration tool mainly includes a high-precision outer diameter alignment component 100 and a high-precision fiber position calibration component 200 . The accuracy of the optical fiber position high-precision calibration element 200 must be much higher than the accuracy of the fiber optic ferrule 300, for example, in the illustrated embodiment, the accuracy of the fiber optic ferrule 300 is equal to or lower than that of a standard multimode ferrule, while The accuracy of the optical fiber position high-precision calibration component 200 is equal to or higher than that of a standard single-mode ferrule, and the optical fiber 400 is a standard single-mode optical fiber, or an optical fiber with a diameter thinner or thicker than the standard single-mode optical fiber.

In the exemplary embodiment shown in FIGS. 1-2, the high-precision outer diameter alignment element 100 is a high-precision alignment sleeve tool, and the high-precision outer diameter alignment element 100 has a first end and a The second end of the fiber position alignment element 200 is inserted into the high-precision outer diameter alignment element 100 from the first end (the left end in the figure), and the fiber ferrule 300 is inserted into the high-precision outer diameter alignment element 100 from the second end (the right end in the figure). Outer diameter alignment element 100, so that the outer cylinder of the fiber optic ferrule 300 can be aligned with the outer cylinder of the fiber position high-precision calibration element 200, thereby aligning the optical fiber 400 and the outer cylinder inserted into the inner hole of the fiber optic ferrule 300 The concentricity of the body, so that the axis of the optical fiber 400 inserted into the inner hole of the fiber optic ferrule 300 is aligned with the axis of the calibration hole 201 of the fiber position high-precision calibration component 200, preferably, so that the inner hole of the optical fiber ferrule 300 is inserted The axial center deviation between the optical fiber 400 in the hole and the outer cylinder of the fiber ferrule 300 is sub-micron level, or the axis of the optical fiber 400 inserted into the inner hole of the fiber ferrule 300 is aligned with that of the optical fiber position high-precision calibration component 200 The deviation between the axes of the calibration holes 201 is on the sub-micron level.

Please continue to refer to FIG. 1 and FIG. 2, one end of the optical fiber 400 passes through the inner hole of the fiber optic ferrule 300 and is inserted into the calibration hole 201, so that the position of the optical fiber 400 in the inner hole of the optical fiber ferrule 300 can be calibrated so that the insertion The axis of the optical fiber 400 in the inner hole of the fiber optic ferrule 300 is aligned with the axis of the calibration hole 201 of the fiber position high-precision calibration element 200, preferably, so that the axis of the optical fiber 400 inserted into the inner hole of the fiber ferrule 300 is aligned with The deviation between the axes of the calibration hole 201 of the optical fiber position high-precision calibration element 200 is sub-micron level, or preferably, the distance between the optical fiber 400 inserted into the inner hole of the optical fiber ferrule 300 and the outer cylinder of the optical fiber ferrule 300 The axis deviation is sub-micron level.

Figures 1 and 2 show schematic diagrams of implementations of calibration tools used to manufacture fiber optic connectors. As shown in Figures 1 and 2, the single-mode fiber 400 passes through the low-precision multimode fiber ferrule 300, and then enters the high-precision fiber position and high-precision calibration component through the guiding structure at the front end of the fiber position high-precision calibration component 200 In the calibration hole 201 of 200, the high-precision calibration hole 201 calibrates the optical fiber 400 located in the inner hole of the low-precision fiber ferrule 300 (such as multimode or low precision) (with a larger inner hole diameter and eccentricity) Relative to the central axis position determined by the outer cylinder of the low-precision fiber ferrule 300, the possibility of random eccentricity of the fiber position due to the large inner aperture of the low-precision fiber ferrule 300 is eliminated, so that the single-mode fiber can be accurately The positional accuracy of the calibration tool on the opposite side is copied, because the physical axis of the outer cylinder of the low-precision fiber optic ferrule 300 is guaranteed by the precise high-precision outer diameter alignment element 100, so that the low-precision fiber optic ferrule 300 The optical fiber in the inner bore is precisely aligned with the physical central axis of the outer cylinder of the low precision fiber ferrule 300 being manufactured.

The glue or equivalent curable body 320 (see FIG. 1) for fixing the optical fiber can be preset in the inner hole of the low-precision ferrule 300, or can be injected and/or injected from the rear end after the optical fiber 400 is calibrated and aligned. Capillarity fills the gap between the optical fiber 400 and the inner hole of the low precision ferrule 300 .

Since there will be overflowing glue on the end face of the low-precision ferrule 300, this end face cannot be in contact with the end face of the optical fiber position calibration tool. Therefore, in the embodiment shown in FIGS. 1 and 2, a high-precision outer diameter alignment element 100 is inserted The fiber position high precision calibration component 200 and the end face of the fiber ferrule 300 are separated by a predetermined distance d1.

Since the gap distance between the fiber position high-precision calibration component 200 and the end face of the fiber ferrule 300 and the length of the fiber 400 passing through the calibration hole 201 of the fiber position high-precision calibration component 200 directly affect the calibration effect and process difficulty, therefore In practice, it is necessary to effectively control the distance between the fiber position calibration tool and the end face of the low-precision ferrule and the length of the fiber inserted into the calibration hole 201 of the high-precision fiber position calibration component 200 . In the embodiment shown in Fig. 1 and Fig. 2, the part of the optical fiber 400 inserted into the calibration hole 201 of the fiber position high-precision calibration element 200 has a predetermined length d2, and the predetermined length d2 can be adjusted according to the actual calibration accuracy requirements and process difficulty Sure.

As shown in FIG. 2 , the calibration tool further includes a holder 500 for fixedly holding the high-precision outer diameter alignment component 100 and the high-precision fiber position calibration component 200 . As shown in the figure, the high-precision outer diameter alignment element 100 and the high-precision optical fiber position alignment element 200 are fixed in the inner hole of the holder 500 through a screw 510 . In this way, the high-precision outer diameter alignment element 100 and the high-precision optical fiber position alignment element 200 can be disassembled from the holder 500 by removing the threaded member 510 .

Although in the embodiment shown in FIGS. 1-2, the high-precision outer diameter alignment element 100 and the fiber position high-precision alignment element 200 are constructed as independent parts, the present invention is not limited thereto, and the high-precision outer diameter The alignment element 100 and the fiber position high precision calibration element 200 can also be constructed in one piece.

After the calibration, the optical fiber 400 is fixed in the fiber ferrule 300 by curing the glue, and after the fixation, the fiber ferrule 300 in production is pulled out from the calibration tool, and it can be realized by continuing to follow the existing fiber cutting and grinding process And complete the high-precision and low-cost fiber optic connector ferrule that needs to be produced.

Fig. 2 has shown a kind of fiber ferrule extractor 600 that is used for pulling out the optical fiber ferrule 300 in the manufacture from the alignment tool, and this fiber ferrule extractor 600 is sleeved on the rear seat 310 of the optical fiber ferrule 300, through Pull out the optical fiber ferrule extractor 600 to pull out the prepared optical fiber ferrule assembly from the calibration tool.

As shown in FIG. 2 , the calibration tool further includes an interval control member 610, which is arranged between the holder 500 and the rear seat 310 of the fiber ferrule 300, and is used to control the insertion of the high-precision outer diameter alignment element 100. The distance d1 between the optical fiber position high-precision calibration component 200 and the end face of the optical fiber ferrule 300 . In practical applications, the distance d1 between the fiber position high-precision calibration component 200 inserted into the high-precision outer diameter alignment component 100 and the end face of the fiber ferrule 300 can be adjusted by adjusting the thickness of the distance control member 610 .

However, the present invention is not limited to the illustrated embodiment, and the gap control member 610 may also be disposed inside the high-precision outer diameter alignment component 100 .

In the embodiment shown in FIG. 2 , the spacing control member 610 and the fiber ferrule extractor 600 are constructed in one piece. However, the present invention is not limited thereto, and the interval control member 610 and the fiber ferrule extractor 600 may also be configured as independent components.

The high-precision calibration tool shown in Figure 1-2 is assembled by a high-precision high-precision outer diameter alignment component 100 and an ultra-precise optical fiber position high-precision calibration component 200 to achieve high-precision outer diameter alignment of the ferrule These two functions are calibrated with high precision of fiber position.

In this way, after the position of the optical fiber is calibrated, a low-cost, high-performance single-mode optical fiber connector based on a low-precision ferrule is manufactured through curing glue and a series of end-face treatment related processes.

FIG. 3 is a cross-sectional view of the calibration tool shown in FIG. 1 . In the embodiment shown in Fig. 1 to Fig. 3, the fiber position high-precision calibration element 200 of the calibration tool is an integral element formed by only one part, and the calibration hole 201 is a circular hole or conforms to the special shape of the optical fiber characteristic hole.

Figure 4 shows a cross-sectional view of another variant of the calibration tool.

Compared with the calibration tools shown in FIGS. 1 to 3 , the calibration tool shown in FIG. 4 differs only in the structure of the high-precision calibration components for optical fiber positions.

As shown in FIG. 4 , the ferrule body of the optical fiber position high-precision calibration component 200' includes a base 2001 and a pressing block 2002 separated from the base 2001. A recess is formed in the base 2001, and a calibration hole 201' is formed on the bottom wall of the recess. The pressing block 2002 is placed in the notch of the base 2001 for holding the optical fiber inserted into the alignment hole 201' in the alignment hole 201'.

In a preferred embodiment, when the pressing block 2002 is fitted into the recess of the base 2001 , the base 2001 and the pressing block 2002 together form a complete cylinder, and are suitable for being inserted into the high-precision outer diameter alignment element 100 . In the embodiment shown in Fig. 4, the alignment hole 201' is formed as a substantially U-shaped slot.

Figure 5 shows a cross-sectional view of yet another variant of the calibration tool.

Compared with the calibration tools shown in FIGS. 1 to 3 , the calibration tool shown in FIG. 5 differs only in the structure of the high-precision calibration components for optical fiber positions.

As shown in Figure 5, the ferrule main body of the optical fiber position high-precision calibration element 200 "comprises a base 2011 and a pressing block 2012 separated from the base 2011. A notch is formed in the base 2011, and the bottom wall of the notch A calibration hole 201" is formed on it. The pressing block 2012 is placed in the notch of the base 2011 for holding the optical fiber inserted into the alignment hole 201 ″ in the alignment hole 201 ″.

In a preferred embodiment, when the pressing block 2012 is fitted into the notch of the base 2011 , the base 2011 and the pressing block 2012 together form a complete cylinder and are suitable for being inserted into the high-precision outer diameter alignment element 100 .

In the embodiment shown in Fig. 5, the calibration hole 201" is formed as a substantially V-shaped groove hole. However, the present invention is not limited to the illustrated embodiment, and the calibration hole may also be formed as a substantially semicircular groove holes or other suitable slots.

Although in the embodiment shown in Fig. 4 and Fig. 5, the optical fiber position high-precision calibration element is a split type element formed by two independent parts, but, the present invention is not limited thereto, the optical fiber position high-precision calibration element is also Can be a split element formed from three or more separate parts.

In the embodiment shown in FIG. 1 , the high precision outer diameter alignment element 100 of the calibration tool is a one-piece alignment sleeve tool formed of only one part. However, the present invention is not limited thereto, and the high-precision outer diameter alignment element of the calibration tool may also be a split-type alignment sleeve tool formed of at least two independent parts.

For example, FIG. 6 shows a schematic diagram of a calibration tool according to another exemplary embodiment of the present invention; FIG. 7 shows a cross-sectional view of the calibration tool in FIG. 6 .

Compared with the calibration tool shown in FIG. 1 , the difference between the calibration tools shown in FIG. 6 and FIG. 7 mainly lies in the different structures of the high-precision outer diameter alignment components.

As shown in Figures 6 and 7, in the illustrated exemplary embodiment, the high precision outer diameter alignment element 100' is formed from two separate components. The illustrated high-precision outer diameter alignment element 100' mainly includes a base 1001 and a top pressure block 1002 separated from the base 1001. A notch 1003 is formed in the base 1001 , and a positioning groove 1004 is formed on the bottom wall of the notch 1003 . The top pressing block 1002 is placed in the notch 1003 of the base 1001 for holding the optical fiber position high precision calibration component 200 placed in the positioning groove 1004 in the positioning groove 1004 .

In the embodiment shown in Fig. 6 and Fig. 7, the entire high-precision outer diameter alignment element 100' may be in the shape of a cuboid. In a preferred embodiment, when the top pressing block 1002 is placed into the recess 1003 of the base 1001 , the top surface of the top pressing block 1002 is substantially flush with the top surface of the base 1001 .

In the embodiment shown in FIGS. 6 and 7 , the positioning groove is formed as a V-shaped positioning groove.

Fig. 8 shows a cross-sectional view of a calibration tool according to yet another exemplary embodiment of the present invention.

In the exemplary embodiment shown in FIG. 8, the high precision outer diameter alignment element is formed from two separate components. The illustrated high-precision outer diameter alignment component mainly includes a base 1011 and a top pressing block 1012 separated from the base 1011 . A notch 1013 is formed in the base 1011 , and a positioning groove 1014 is formed on the bottom wall of the notch 1013 . The top pressing block 1012 is placed in the notch 1013 of the base 1011 for holding the optical fiber position high precision calibration component 200 in the positioning groove 1014 .

Compared with the calibration tool shown in FIG. 6 and FIG. 7 , the main difference of the calibration tool shown in FIG. 8 lies in the shape of the positioning groove of the high-precision outer diameter alignment component 100 . In the exemplary embodiment shown in FIG. 8, the positioning groove is formed as a U-shaped positioning groove. However, the present invention is not limited thereto, and the positioning groove is formed in an arc shape or other suitable shapes.

In the aforementioned exemplary embodiments, a calibration method for calibrating the position of the optical fiber in the inner hole of the fiber ferrule is described, the method mainly includes the following steps:

S100: Provides a stand-alone alignment tool with higher accuracy than the fiber optic ferrule; and

S200: Use a calibration tool to calibrate the position of the optical fiber in the inner hole of the optical fiber ferrule.

According to another exemplary embodiment of the present invention, the aforementioned step S200 may include the following steps:

S201: Align the outer cylinder of the fiber ferrule 300 with the outer cylinder of the fiber position high-precision calibration component 200 using the high-precision outer diameter alignment component 100; and

S202: Insert one end of the optical fiber 400 passing through the inner hole of the optical fiber ferrule 300 into the calibration hole 201 of the fiber position high-precision calibration component 200, for aligning the axis of the optical fiber 400 inserted into the inner hole of the optical fiber ferrule 300 with the optical fiber The central axes defined by the outer cylinders of the ferrule 300 are aligned.

According to another exemplary embodiment of the present invention, after step S200, further steps are included:

S300: Fix the optical fiber 400 in the optical fiber ferrule 300 by curing glue, and the glue is filled into the inner hole of the optical fiber ferrule 300 before or after the optical fiber 400 is inserted into the inner hole of the optical fiber ferrule 300 .

According to another exemplary embodiment of the present invention, after calibration, the axis center deviation between the optical fiber 400 inserted into the inner hole of the fiber optic ferrule 300 and the outer cylinder of the fiber optic ferrule is at sub-micron level.

Fig. 9 shows a cross-sectional view of a fiber optic ferrule assembly manufactured by the method of the present invention. As shown in Figure 9, after the glue 301 is cured, the optical fiber 400 is fixed in the inner hole of the fiber optic ferrule 300, after the optical fiber 400 is fixed in the inner hole of the optical fiber ferrule 300, in one embodiment of the present invention , the maximum distance between the inner wall surface of the inner hole of the optical fiber ferrule 300 and the outer peripheral surface of the optical fiber 400 (that is, the maximum thickness of the apron formed by the glue 301) is greater than or equal to the axis C400 of the optical fiber 400 and the distance between the optical fiber ferrule 300 The eccentric distance between the axes C300 of the outer cylinders.

In an exemplary embodiment of the present invention, the diameter tolerance of the outer cylinder of the fiber optic ferrule 300 is -0.001mm˜0.001mm.

In another exemplary embodiment of the present invention, the diameter tolerance of the inner hole of the optical fiber ferrule 300 is 0.000-0.030 mm.

The protection object of the present invention is not limited to the aforementioned calibration tool and/or the aforementioned calibration method, but also includes the optical fiber ferrule assembly made by the aforementioned calibration tool and/or the aforementioned calibration method and the optical fiber connector including the optical fiber ferrule assembly.

In another exemplary embodiment of the present invention, a fiber optic connector is described, including a low-precision fiber optic ferrule whose precision is equal to or lower than that of a standard multimode ferrule, wherein, during the manufacturing process, the aforementioned calibration tool is used to And/or the aforementioned calibration method calibrates the position of the optical fiber in the inner hole of the low-precision optical fiber ferrule, so that the position accuracy of the optical fiber in the inner hole of the low-precision optical fiber ferrule reaches or exceeds that of a standard single-mode ferrule Position accuracy in the inner bore, and after alignment, fix the fiber in a low-precision fiber ferrule, so that the accuracy of the manufactured fiber optic connector meets or exceeds the accuracy of standard single-mode fiber optic connectors.

In the embodiment shown in FIG. 1 , the optical fiber is a conventional single-core optical fiber 400 . However, the present invention is not limited thereto, and the optical fiber may also be other types of optical fiber. For example, the other two optical fibers shown in Fig. 10 and Fig. 13 .

Fig. 10 shows a schematic diagram of another optical fiber according to the present invention. As shown in FIG. 10 , the optical fiber is a multi-core optical fiber 410 including a plurality of cores 411 . In the illustrated embodiment, the multi-core optical fiber 410 includes nineteen cores 411 , however, the present invention is not limited thereto, and the multi-core optical fiber 410 may also include two or more cores 411 . In the illustrated embodiment, a plurality of cores 411 are wrapped and held in place by an outer cladding 412, and the outer cladding 412 forms an outer cylinder.

Fig. 11 shows a schematic perspective view of a plurality of loose optical fibers; Fig. 12 shows an end view of a plurality of loose optical fibers in Fig. 11; Fig. 13 shows a plurality of loose optical fibers in Fig. 11 and Fig. 12 in the calibration hole of the present invention A schematic perspective view of a bundled optical fiber formed after being aligned; and FIG. 14 shows an end view of the aligned bundled optical fiber in FIG. 13 .

As shown in FIG. 11 and FIG. 12 , seven loose optical fibers 421 are irregularly arranged together, and the mutual positions of these loose optical fibers 421 are uncertain. But, after these loose optical fibers 421 are inserted in the calibration hole 201 of the calibration tool of the present invention, as shown in Figure 13 and Figure 14, these seven loose optical fibers 421 are just kept in place, forming a A bundle of seven fibers 421 (or called a multi-fiber bundle) 420 .

As shown in FIG. 13 and FIG. 14 , in the bundled optical fiber 420 , any two adjacent optical fibers 421 are tangent to each other. For example, in the illustrated embodiment, one fiber is in the middle, six other fibers surround this fiber, and the seven fibers are tangent two by two.

Although in the illustrated embodiment, the bundled optical fiber 420 includes seven optical fibers 421 , the present invention is not limited thereto, and the bundled optical fiber 420 may also include two or more optical fibers 421 .

In one embodiment of the present invention, each optical fiber 421 in the bundled optical fiber 420 may be a conventional single-core optical fiber 400 shown in FIG. 1 or a multi-core optical fiber 410 shown in FIG. 10 .

In order to calibrate a plurality of loose optical fibers 421 shown in Figure 11 and Figure 12, the calibration hole 201 can be a circular hole, a quincunx-shaped hole, a polygonal hole or a hole of other suitable shape, as long as the shape of the calibration hole can make a plurality of loose fibers It is sufficient to calibrate the optical fibers to form a bundled optical fiber 420 in which any two adjacent optical fibers 421 are tangent to each other.

In one embodiment of the present invention, after the optical fiber with multiple cores (single-fiber multi-core, multi-fiber bundle) is calibrated for position accuracy and before being solidified in a low-precision ferrule, the radial azimuth of the optical fiber is adjusted to With a specific distribution orientation, the radial azimuth angle of the optical fiber after curing in the ferrule satisfies the mutual mating of multi-core connectors.

Compared with the prior art, the present invention abandons the prior art of manufacturing single-mode and multi-mode optical fiber connectors by distinguishing ferrules with different precision specifications.

In particular, when it is necessary to make low-loss or ultra-low-loss fiber optic connectors, the method used by prior art personnel is to increase the precision specifications of the ferrule (reducing the diameter of the inner hole, and improving the concentricity between the inner hole and the outer cylinder) To achieve the goal of ultra-low loss, the obvious disadvantage of this is that, first, it means a high cost; second, because the inner hole of the ultra-precision ferrule becomes smaller, and the actual outer diameter of the optical fiber also has batch The change is a great challenge for threading the fiber (passing through the entire inner hole of the ferrule), which leads to an increase in the probability of fiber breakage, especially the dark damage will lead to a decrease in the reliability of the optical connector; third, for mass production , there is always some discreteness of individual eccentricity, as long as it occurs, the random intermatching insertion loss of the optical connection device will be destroyed, and so on.

And adopt the technology of the present invention, promptly utilize high-precision calibration tool to be positioned at the physical position collimation of the single-mode optical fiber in the ferrule of low precision (such as multimode ferrule), because the optical fiber in making duplicates the high-precision calibration tool opposite The position accuracy enables the manufacture of high-precision, high-performance (low-loss) single-mode fiber optic connectors in low-precision ferrules. This invention greatly reduces the requirements for the accuracy of the ferrule, and reduces the material cost of the product from the technical design. Similarly, whether the technology is used for manual or automatic fiber threading, the fiber threading action becomes easier, especially It is beneficial to the automation of the process, and it is possible to increase production capacity and further reduce costs; it should be further pointed out that this technology knows the performance of the product through the accuracy of the tool, and it is controllable, predictable, and individual-to-individual accuracy can be repeated. In this way, the invention simultaneously realizes low-cost and high-performance connecting device manufacturing technology.

Those skilled in the art can understand that the above-described embodiments are exemplary, and those skilled in the art can improve them, and the structures described in various embodiments do not conflict with each other in terms of structure or principle Can be combined freely.

Although the present invention has been described with reference to the accompanying drawings, the embodiments disclosed in the accompanying drawings are intended to illustrate preferred embodiments of the present invention and should not be construed as a limitation of the present invention.

While certain embodiments of the present general inventive concept have been shown and described, it will be understood by those of ordinary skill in the art that changes may be made to these embodiments without departing from the principles and spirit of the present general inventive concept. The scope is defined by the claims and their equivalents.

It should be noted that the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. Furthermore, any element references in the claims should not be construed as limiting the scope of the invention.

Claims (39)

1. A calibration tool for calibrating the position of the optical fiber in the inner hole of the fiber optic ferrule, the precision of the fiber optic ferrule (300) is equal to or lower than the precision of a standard multimode ferrule, characterized in that, The calibration tool includes a high-precision outer diameter alignment component (100) and a high-precision fiber position calibration component (200), and the precision of the fiber position high-precision calibration component (200) is equal to or higher than that of a standard single-mode ferrule precision, The high-precision outer diameter alignment component (100) is used to align the outer cylinder of the optical fiber ferrule (300) with the outer cylinder of the fiber position high-precision calibration component (200); One end of the optical fiber (400) passes through the inner hole of the optical fiber ferrule (300) and is inserted into the calibration hole (201) of the optical fiber position high-precision calibration component (200), so that the fiber inserted into the optical fiber ferrule (300) The axis of the optical fiber (400) of the inner bore is aligned with the central axis defined by the outer cylinder of the fiber optic ferrule (300). 2. The calibration tool according to claim 1, characterized in that, the high-precision outer diameter alignment element (100) is a high-precision alignment sleeve tool, The fiber position high-precision calibration component (200) is inserted from one end of the high-precision outer diameter alignment component (100), and the optical fiber ferrule (300) is inserted into the high-precision outer diameter alignment component (100) from the other end ), after insertion, the central axis defined by the outer cylinder of the optical fiber ferrule (300) is aligned with the central axis defined by the outer cylinder of the high-precision calibration component (200). 3. The calibration tool of claim 1, wherein: The high-precision outer diameter alignment element (100) is an integral element formed of only one part. 4. The calibration tool of claim 1, wherein: The high-precision outer diameter alignment element is a split element formed by at least two independent parts. 5. The calibration tool according to claim 4, characterized in that, the high-precision outer diameter alignment element (100') comprises: A base (1001, 1011), a notch (1003, 1013) is formed in the base (1001, 1011), and a positioning groove (1004, 1014) is formed on the bottom wall of the notch (1003, 1013) );and Top pressing blocks (1002, 1012), the top pressing blocks (1002, 1012) are placed in the notches (1003, 1013) of the base (1001, 1011), and are used to hold the optical fiber position high-precision calibration element (200) In the positioning groove (1004, 1014). 6. The calibration tool according to claim 5, characterized in that, the positioning grooves (1004, 1014) are V-shaped positioning grooves or U-shaped positioning grooves. 7. The calibration tool according to claim 2, characterized in that the optical fiber position high-precision calibration component (200) is an ultra-precision ferrule tool with a precision higher than that of a standard single-mode ferrule. 8. The calibration tool of claim 7, wherein The optical fiber position high-precision calibration component (200) inserted into the high-precision outer diameter alignment component (100) is separated from the end face of the fiber ferrule (300) by a predetermined distance (d1). 9. The calibration tool of claim 8, wherein A portion of the optical fiber (400) inserted into the calibration hole (201) of the optical fiber position high-precision calibration component (200) has a predetermined length (d2). 10. The calibration tool according to claim 9, further comprising: The holding seat (500) is used for fixedly holding the high-precision outer diameter alignment component (100) and the high-precision optical fiber position calibration component (200). 11. The calibration tool of claim 10, wherein, The high-precision outer diameter alignment element (100) and the optical fiber position high-precision alignment element (200) are detachably fixed on the holder (500). 12. The calibration tool of claim 11 wherein, The high-precision outer diameter alignment element (100) and the optical fiber position high-precision alignment element (200) are configured as mutually independent components, or are configured as one piece. 13. The calibration tool according to claim 10, further comprising: The spacing control part (610), is arranged between the holder (500) and the rear seat (310) of the fiber ferrule (300) or is arranged inside the high-precision outer diameter alignment element (100), and is used to control the insertion of the The distance (d1) between the optical fiber position high-precision calibration component (200) of the high-precision outer diameter alignment component (100) and the end face of the optical fiber ferrule (300) is described. 14. The calibration tool according to claim 13, further comprising: The fiber optic ferrule extractor (600), sleeved on the rear seat (310) of the fiber optic ferrule (300), is used to take out the ferrule assembly containing the optical fiber after the optical fiber (400) is calibrated and fixed. 15. The calibration tool of claim 14, wherein, The interval control member (610) and the fiber ferrule extractor (600) are configured as separate components, or are configured as one piece. 16. The calibration tool of claim 2, wherein The optical fiber position high-precision calibration element (200) is an integral element formed by only one component, and the calibration hole (201) is a circular hole or a characteristic hole conforming to the special shape of the optical fiber. 17. The calibration tool according to claim 1, wherein the high-precision optical fiber position calibration component is a split component formed by at least two independent components. 18. The calibration tool according to claim 17, characterized in that, the optical fiber position high precision calibration element (200', 200") comprises: a base (2001, 2011) having a recess formed therein, a calibration hole (201', 201") formed in the bottom wall of the recess; and a pressing block (2002, 2012), the pressing block (2002, 2012) is placed in the notch of the base (2001, 2011), and is used to keep the optical fiber inserted into the alignment hole (201', 201") in alignment holes (201', 201"). 19. The calibration tool according to claim 18, characterized in that, the calibration holes (201', 201") are U-shaped slots or V-shaped slots. 20. A calibration method for calibrating the position of an optical fiber in an inner hole of a fiber optic ferrule, said method comprising the steps of: S100: Provides a stand-alone alignment tool with higher accuracy than the fiber optic ferrule; and S200: Use a calibration tool to calibrate the position of the optical fiber in the inner hole of the optical fiber ferrule. 21. The calibration method according to claim 20, wherein the calibration tool is the calibration tool according to any one of claims 1-19. 22. The calibration method according to claim 21, wherein said step S200 comprises the following steps: S201: Align the outer cylinder of the fiber ferrule (300) with the outer cylinder of the optical fiber position high-precision calibration element (200) using the high-precision outer diameter alignment element (100); and S202: Insert one end of the optical fiber (400) passing through the inner hole of the optical fiber ferrule (300) into the calibration hole (201) of the fiber position high-precision calibration component (200), for inserting the optical fiber ferrule (300) The axis of the optical fiber (400) in the inner hole is aligned with the central axis defined by the outer cylinder of the fiber ferrule (300). 23. The calibration method according to claim 22, characterized in that, Between the holder (500) and the rear seat (310) of the fiber ferrule (300) or inside the high-precision outer diameter alignment element (100), there is a space control member (610), which is used to control the insertion of the The optical fiber position of the high-precision outer diameter alignment component (100) is the distance (d1) between the high-precision calibration component (200) and the end face of the fiber ferrule (300). 24. The calibration method according to claim 23, characterized in that, The optical fiber position high-precision calibration component (200) inserted into the high-precision outer diameter alignment component (100) is separated from the end face of the fiber ferrule (300) by a predetermined distance (d1). 25. Calibration method according to claim 24, is characterized in that, A portion of the optical fiber (400) inserted into the calibration hole (201) of the optical fiber position high-precision calibration component (200) has a predetermined length (d2). 26. The calibration method according to claim 25, characterized in that, Glue (320) is filled in the inner hole of the optical fiber ferrule (300), for fixing the optical fiber (400) in the inner hole of the optical fiber ferrule (300), The glue is filled into the inner hole of the optical fiber ferrule (300) before or after the optical fiber (400) is inserted into the inner hole of the optical fiber ferrule (300). 27. The calibration method according to claim 26, wherein, after step S200, further comprising the steps of: S300: curing the glue to fix the optical fiber (400) in the optical fiber ferrule (300). 28. An optical fiber ferrule assembly, comprising a single-hole optical fiber ferrule and an optical fiber located in the inner hole of the optical fiber ferrule, the accuracy of the optical fiber ferrule is equal to or lower than that of a standard multimode ferrule, characterized in that , the fiber optic ferrule assembly is made using the calibration tool of any one of the preceding claims 1-19 and/or the calibration method of any of the preceding claims 20-27, and the fiber optic ferrule assembly produced Accuracy meets or exceeds that of standard single-mode fiber optic ferrule assemblies. 29. The fiber optic ferrule assembly of claim 28, wherein: After calibration, the axial center deviation between the optical fiber (400) inserted into the inner hole of the optical fiber ferrule (300) and the outer cylinder of the optical fiber ferrule is at sub-micron level. 30. The fiber optic ferrule assembly of claim 28, wherein: The diameter tolerance of the outer cylinder of the optical fiber ferrule (300) is -0.001mm˜0.001mm. 31. The fiber optic ferrule assembly of claim 28, wherein: The diameter tolerance of the inner hole of the optical fiber ferrule (300) is 0.000-0.030 mm. 32. The fiber optic ferrule assembly of claim 28, wherein: The diameter tolerance of the outer cylinder of the optical fiber ferrule (300) is -0.001 mm to 0.001 mm; and The diameter tolerance of the inner hole of the optical fiber ferrule (300) is 0.000-0.030 mm. 33. The fiber optic ferrule assembly of claim 32, wherein: After the optical fiber (400) is fixed in the inner hole of the optical fiber ferrule (300) by glue or equivalent curable body (301), the inner wall surface of the inner hole of the optical fiber ferrule (300) is in contact with the optical fiber ( The maximum distance between the outer peripheral surfaces of 400) is greater than or equal to the eccentric distance between the axis (C400) of the optical fiber (400) and the axis (C300) of the outer cylinder of the fiber ferrule (300). 34. An optical fiber connector, characterized in that the optical fiber connector comprises the optical fiber ferrule assembly as defined in claim 28. 35. An optical fiber connector comprising a low-precision optical fiber ferrule with a precision equal to or lower than a standard multimode ferrule, characterized in that, During the manufacturing process, the calibration tool of any one of the preceding claims 1-19 and/or the calibration method of any one of the preceding claims 20-27 are used to check the alignment of the optical fiber in the inner hole of the low-precision fiber ferrule The position is calibrated so that the position accuracy of the fiber in the bore of the low-precision fiber ferrule meets or exceeds that of a standard single-mode fiber ferrule, and after calibration, the fiber is fixed in the low-precision ferrule In the fiber optic ferrule, so that the precision of the manufactured fiber optic connector reaches or exceeds the precision of the standard single-mode fiber optic connector. 36. The optical fiber connector according to claim 34 or 35, characterized in that the optical fiber is a conventional single-core optical fiber (400). 37. The optical fiber connector according to claim 34 or 35, characterized in that, the optical fiber is a multi-core optical fiber (410) comprising multiple cores (411), that is, single fiber multi-core. 38. The optical fiber connector according to claim 34 or 35, characterized in that, the optical fiber is a bundled optical fiber (420) comprising a plurality of optical fibers (421), that is, an aggregate of multiple optical fibers formed by a single-core optical fiber. 39. The optical fiber connector according to claim 37 or 38, after the optical fiber with multiple cores (single fiber multi-core, multi-fiber bundle) is calibrated for position accuracy and before being solidified in the low-precision ferrule, the diameter of the optical fiber The azimuth angle is adjusted to a specific distribution azimuth, and the radial azimuth angle of the optical fiber after curing in the ferrule meets the mutual mating of multi-core connectors.