CN111221083A - Multi-core optical fiber single-core connector and preparation and alignment method thereof - Google Patents
Multi-core optical fiber single-core connector and preparation and alignment method thereof Download PDFInfo
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- CN111221083A CN111221083A CN201911250589.XA CN201911250589A CN111221083A CN 111221083 A CN111221083 A CN 111221083A CN 201911250589 A CN201911250589 A CN 201911250589A CN 111221083 A CN111221083 A CN 111221083A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/36—Mechanical coupling means
- G02B6/38—Mechanical coupling means having fibre to fibre mating means
- G02B6/3807—Dismountable connectors, i.e. comprising plugs
- G02B6/3833—Details of mounting fibres in ferrules; Assembly methods; Manufacture
- G02B6/3834—Means for centering or aligning the light guide within the ferrule
- G02B6/3843—Means for centering or aligning the light guide within the ferrule with auxiliary facilities for movably aligning or adjusting the fibre within its ferrule, e.g. measuring position or eccentricity
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/36—Mechanical coupling means
- G02B6/38—Mechanical coupling means having fibre to fibre mating means
- G02B6/3807—Dismountable connectors, i.e. comprising plugs
- G02B6/3809—Dismountable connectors, i.e. comprising plugs without a ferrule embedding the fibre end, i.e. with bare fibre end
Abstract
The invention discloses a multi-core optical fiber connector and a preparation and alignment method thereof, belonging to the field of passive optical devices. Injecting glue into the metal tail handle on the special ferrule by adopting the special ferrule with the bare ferrule and the metal tail handle capable of freely rotating in the metal sleeve ring, grinding the end face of the optical fiber after the bare fiber penetrates into the special ferrule to be cured, horizontally placing the special ferrule, and fixing the metal sleeve ring by using a clamp; rotating a metal tail handle connected with the bare ferrule to enable a mark in the end face of the optical fiber to be located at a preset position, observing the end face of the optical fiber according to the arrangement form of each core in the multi-core optical fiber, calculating an included angle between a circle center connecting line of two fiber cores which are farthest from each other and a horizontal shaft or a vertical shaft, continuously rotating the metal tail handle to enable the error between the degree of the included angle and the target degree to be within a preset range, dispensing and fixing the relative position of a metal sleeve ring and the metal tail handle, and assembling all parts. Direct, fast and low-insertion-loss connection alignment between single multi-core optical fibers can be realized.
Description
Technical Field
The invention belongs to the field of passive optical devices, and particularly relates to a multi-core optical fiber single-core connector and a preparation and alignment method thereof.
Background
In an optical communication network, space division multiplexing optical fibers are widely concerned and researched because the space division multiplexing optical fibers can bring about magnitude order improvement to the transmission capacity of a single optical fiber, the traditional shannon limit can be broken, and transmission with higher bandwidth is realized. The multi-core fiber is a space division multiplexing fiber, and under the condition that the size of a cladding of the single-mode fiber is basically consistent with or slightly larger than that of the cladding of the single-mode fiber, the multi-core fiber contains a plurality of fiber cores, so that the transmission capacity of a single fiber is obviously improved. In data centers and high performance computing systems, optical interconnection technology is widely used to address the enormous demands of high bandwidth and high density interconnections, and multi-core optical fibers are a very promising solution in order to improve system bandwidth and the complexity of dense wiring of front panels. In order to facilitate connection and plugging, the application scenes of high-capacity and high-density interconnection by using the multi-core optical fiber are not separated from the use of the multi-core optical fiber connector.
A fiber optic connector is a passive optical device in which optical fibers are detachably connected to one another, and which precisely aligns the end faces of two optical fibers and minimizes the loss of connection caused by the introduction thereof. The cold connection mode of aligning and connecting the end faces of the optical fibers by using the optical fiber connector is convenient and quick in actual use scenes, and a fusion splicing device and a series of processing on the optical fibers are not needed like thermal fusion splicing. But the losses introduced by fiber optic connectors are generally higher than thermal fusion. The optical fiber connectors are classified according to the structural form of the connectors, such as FC, SC, ST, LC, D4, DIN, MU, MT and the like; PC (SPC or UPC) and APC are distributed according to the shape of the end face of the optical fiber; the fiber is divided into single core and multiple core (MT, MPO).
For the manufacture of single-core connectors of multi-core optical fibers, such as connectors of FC, SC, LC, MU, and the like, the single-core connector manufacturing method of single-mode or multi-mode optical fibers is very mature at present, and the insertion loss introduced by the single-core connector of single-mode optical fibers (commonly used types of FC, SC, LC, MU, and the like) is generally not more than 0.35dB, even 0.2-0.3 dB. And there are few related techniques and technologies to fabricate a multicore fiber single-core connector to achieve alignment between individual multicore fibers. In the process of manufacturing the multi-core optical fiber single-core connector, how to rotate and align the multi-core optical fiber and how to realize the multi-core optical fiber single-core connector with low insertion loss is a difficulty in manufacturing the multi-core optical fiber connector, and the application prospect and feasibility of the multi-core optical fiber are directly influenced by the loss of the connector.
The multi-core optical fiber connectors and the manufacturing methods thereof are proposed in reference to patent applications CN201910503135.2, CN201720401212.x, CN201811449039.6, CN201810321242.9 and the like, but the multi-core optical fibers mentioned in these patents do not refer to space division multiplexing multi-core optical fibers, do not refer to accommodating multiple cores in a single optical fiber, but refer to multiple optical fiber bundles in a single optical cable or multiple optical fibers in an optical fiber ribbon, each optical fiber is a common single-core single-mode optical fiber, and these patents solve the problem of how to insert multiple single-core single-mode optical fibers in an optical fiber bundle into a multi-core connector (MT, MPO) so as to realize direct aligned connection of multiple single-core single-mode optical fibers, rather than direct aligned connection between multiple-core single-fiber.
The reference patent application CN201510110419.7 provides a multi-core optical fiber connection structure, but instead of directly connecting the end faces of the optical fibers through a conventional optical fiber connector, the multi-core optical fiber is connected with the connection optical fiber by rotating the connection optical fiber, using the same number of connection optical fibers with the same outer diameter as the core number of the multi-core optical fiber and the optical fiber elastic sleeve sleeved outside the connection optical fiber and the multi-core optical fiber. The method is complex to operate, and special raw materials such as the connecting optical fiber and the optical fiber elastic sleeve are required to be prepared additionally, so that the method cannot be widely applied in practical application.
Disclosure of Invention
In order to overcome the defects or the improvement requirements in the prior art, the invention provides a multi-core optical fiber single-core connector and a preparation and alignment method thereof, and therefore, the technical problem of how to rotate and align a multi-core optical fiber in the process of manufacturing the multi-core optical fiber single-core connector and how to realize the multi-core optical fiber single-core connector with low insertion loss is solved.
To achieve the above object, according to one aspect of the present invention, there is provided a method of preparing and aligning a multi-core optical fiber single-core connector, wherein the multi-core optical fiber single-core connector includes: special lock pin and parts, special lock pin includes: naked lock pin, metal caudal peduncle and metal lantern ring, its characterized in that, naked lock pin with the metal caudal peduncle can freely rotate in the metal lantern ring, the method includes:
injecting glue into the metal tail handle on the special insertion core, penetrating a bare fiber into the special insertion core and curing, grinding the end face of the fiber after curing, horizontally placing the special insertion core, and fixing the metal sleeve ring by using a clamp, wherein the bare fiber is obtained by stripping a coating layer with a preset length at the front end of the multi-core fiber;
observing the positions of each core and the mark in the ground multi-core optical fiber end surface, rotating the metal tail handle connected with the bare ferrule to enable the mark in the multi-core optical fiber end surface to be located at a preset position, finding out the circle centers of two fiber cores with the farthest random distance by observing the positions of each fiber core in the multi-core optical fiber end surface according to the arrangement form of each fiber core in the multi-core optical fiber, calculating the included angle between the connection line of the two circle centers and a horizontal shaft or a vertical shaft, continuously rotating the metal tail handle connected with the bare ferrule to enable the error between the degree of the included angle and the target degree to be within a preset range, then fixing the relative position of the metal sleeve ring and the metal tail handle by dispensing, and finally assembling all loose parts.
Preferably, according to the arrangement form of each fiber core in the multicore fiber, finding out the center of a circle of two fiber cores with the farthest arbitrary distance by observing the position of each fiber core in the ground multicore fiber end face, and finding out the included angle between the connection line of the two centers of circles and the horizontal axis or the vertical axis, the method includes:
when the multi-core optical fiber is annularly arranged, the center of any farthest two fiber cores on a ring with n fiber cores arranged in an even number is determined by observing the end face of the multi-core optical fiber, and a first included angle between a connecting line of the two centers of circles and a horizontal axis or a vertical axis is obtained, wherein n is a positive integer.
Preferably, when the multicore fibers are annularly arranged multicore fibers, the target degree is 0 °, 90 °, or 360/n °.
Preferably, according to the arrangement form of each fiber core in the bare fiber, the center of a circle of two fiber cores with any farthest distance is found out by observing the position of each fiber core in the ground multi-core fiber end surface, and the included angle between the connecting line of the two centers of the circles and the horizontal axis or the vertical axis is solved, including:
when the multi-core optical fiber is a multi-core optical fiber which is arranged in a rectangular shape, a second included angle between a connecting line of centers of two fiber cores on a maximum rectangular diagonal line and a horizontal axis or a vertical axis is obtained according to the design of the core spacing of the multi-core optical fiber;
and finding a third included angle between a connecting line between the centers of the two fiber cores on the maximum rectangular diagonal line and the horizontal axis or the vertical axis by observing the end face of the multi-core optical fiber.
Preferably, when the multi-core optical fibers are arrayed in a rectangular shape, the metal lantern ring is fixed, and the metal tail handle is rotated, so that the error between the third included angle and the second included angle is within a preset range.
Preferably, an inner diameter of the special ferrule is matched with an outer diameter of the bare fiber with a coating layer removed.
Preferably, the number of the cores of the multicore fiber is any number, and the cores of the multicore fiber are symmetrically arranged.
Preferably, the cores of the multicore fiber are arranged in a ring shape or a rectangle shape.
According to an aspect of the present invention, there is provided a multicore optical fiber single core connector obtained by the method for preparing and aligning a multicore optical fiber single core connector according to any one of the above.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects: the preparation and alignment method of the multi-core optical fiber single-core connector is simple and easy to operate, and direct, quick and low-insertion-loss connection alignment between single multi-core optical fibers can be realized. The method is suitable for multi-core optical fibers with different core numbers and structures, such as four cores, six cores, seven cores, eight cores, nineteen cores and the like, is arranged in a ring shape or a rectangular shape or other symmetrical arrangement, and can be used for preparing single-core connectors with various structures and end face types, FC, SC, LC, MU or the like, SPC, UPC or APC. The fiber core positioning precision is high, the insertion loss of the connector is low, and the repeatability is good. The six-core, seven-core, eight-core fiber optic connectors have a loss per core of less than 0.35dB at both 1310nm and 1550nm, and preferably have a loss per core of less than 0.25 dB. The nineteen-core fiber optic connector has a loss per core of less than 0.45dB at both 1310nm and 1550nm, and preferably, a loss per core of less than 0.3 dB. The multi-core optical fiber is possible to be used for high-density interconnection of data centers.
Drawings
FIG. 1 is a schematic flow chart illustrating a method for manufacturing and aligning a multi-fiber connector according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a ferrule placement and fiber end view method according to an embodiment of the invention;
FIG. 3 is a schematic diagram of a method for aligning and positioning a seven-core optical fiber according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a method for aligning and positioning a ring-shaped six-core optical fiber according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a method for aligning and positioning a rectangular eight-core optical fiber according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a nine-core optical fiber alignment positioning method according to an embodiment of the present invention;
wherein, 1 is the metal lantern ring, 2 is anchor clamps, 3 is the metal caudal peduncle, 4 is naked lock pin, 5 is special lock pin, 6 is naked optic fibre, 7 is the spare.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention provides an alignment and preparation method of a multi-core optical fiber single-core connector, so that direct, fast and low-insertion-loss connection alignment between a single multi-core optical fiber and a single multi-core optical fiber is realized. The core number of the multi-core optical fiber can be any number of four cores, six cores, seven cores, eight cores, nineteen cores and the like, and the fiber cores can be arranged in a ring shape or a rectangular shape or other symmetrical arrangements. The single-core connector structure type can be FC, SC, LC, MU or other, the end face type can be SPC, UPC or APC, and any combination of connectors can be applicable.
Fig. 1 is a schematic flow chart illustrating a method for manufacturing and aligning a multi-fiber connector according to an embodiment of the present invention, including the following steps:
as shown in fig. 2, a special ferrule 5 and a separate member 7 of some kind are prepared, and it is noted that the inner diameter of the special ferrule 5 needs to be matched with the outer diameter of the bare fiber 6 from which the coating layer is stripped. Stripping a coating layer with a preset length at the front end of the optical fiber with the parts 7 such as the tail sleeve and the like, injecting glue into the metal tail handle 3 on the special ferrule 5, penetrating the bare optical fiber 6 into the special ferrule 5, and placing the bare optical fiber on a curing furnace for curing. And grinding the end face of the optical fiber after curing. The special core insert 5 is horizontally placed, the metal sleeve ring 1 is fixed by the clamp 2, and the metal tail handle 3 is connected with the bare core insert 4 and can freely rotate in the metal sleeve ring 1. An imaging device is arranged at the front end of the end face of the bare insert core, the imaging device is connected with the terminal, and the condition of the position of each core of the end face of the optical fiber can be observed in the terminal display.
Wherein, the special ferrule 5 comprises a bare ferrule 4, a metal tail handle 3 and a metal lantern ring 1. The bare ferrule 4 and the metal tail handle 3 are fixedly connected together, the metal sleeve ring 1 is sleeved near the connection part of the bare ferrule 4 and the metal tail handle 3, and the bare ferrule 4 and the metal tail handle 3 can freely rotate in the metal sleeve ring 1.
The special ferrule in the embodiment of the invention refers to a ferrule in which the bare ferrule and the metal tail handle can freely rotate in the metal sleeve ring.
In the embodiment of the present invention, the imaging device may employ a CCD or a camera, and the specific embodiment of the present invention is not limited uniquely.
The multi-core optical fiber is generally provided with a mark for distinguishing each core and the position of the core, and the mark can be made at any self-set position in the optical fiber. The metal tail handle 3 connected with the bare inserting core 4 is rotated to enable the mark to be positioned at a certain set fixed position, and the mark is placed in the same area every time the multi-core optical fiber single-core connector is manufactured.
For the multi-core optical fibers arranged in a ring shape, a connecting line between any farthest circle centers of two fiber cores on a ring in which an even number (n) of the fiber cores are arranged is found on an optical fiber end face displayed by a terminal, and an included angle alpha between the connecting line and a horizontal axis or a vertical axis is obtained. The metal tail handle 3 is slightly rotated to make the degree of the included angle alpha approach 0 degrees or 90 degrees or 360/n degrees, and then the relative position of the metal lantern ring 1 and the metal tail handle 3 is fixed by glue dispensing. The closer alpha is to 0 degrees or 90 degrees or 360/n degrees, the more accurate the positioning is, the smaller the insertion loss of the connector is. Finally, all the parts 7 and the special ferrules 5 are assembled.
For a multi-core optical fiber arranged in a rectangular shape, an included angle β between a connecting line between centers of two fiber cores on a maximum rectangular diagonal line and a horizontal axis or a vertical axis is accurately calculated, on an optical fiber end face displayed by a computer, the connecting line between the centers of the two fiber cores on the maximum rectangular diagonal line is found, an included angle theta between the connecting line and the horizontal axis or the vertical axis is calculated, the metal tail handle 3 is slightly rotated, the degree of the included angle theta is enabled to be approximate to β, then the relative position of the metal sleeve ring 1 and the metal tail handle 3 is fixed in a dispensing mode, the theta is closer to β, the more accurate the positioning is, the smaller the insertion loss of a connector is, and finally, all the parts 7 and the.
The present invention is described in detail below with reference to the accompanying drawings and specific examples, it should be noted that the present invention is only an optional embodiment, and other arrangements and other special ferrules and the like may also be adopted.
The first embodiment is as follows: seven-core optical fiber LC/UPC connector
The seven-core optical fiber shown in fig. 3 has an angle of 360/6 degrees, which is 60 degrees, between a line connecting centers of two cores located farthest from each other in the 6-core arranged loop and a horizontal axis.
And preparing special core inserts and parts of LC/UPC, and noting that the inner aperture of the special core insert needs to be matched with the diameter of the seven-core optical fiber cladding. Removing the coating layer with the length of about 35mm at the front end of the optical fiber with the parts such as the tail sleeve and the like, injecting glue into the metal tail handle of the special ferrule, penetrating the bare optical fiber into the special ferrule, placing the special ferrule on a curing furnace for curing, and grinding the end face of the optical fiber after curing. And horizontally placing the special inserting core, fixing the metal lantern ring by using a special clamp, and observing the position condition of the ground multi-core optical fiber end face by using a high-definition CCD (charge coupled device). The metal tail handle connected with the bare ferrule is rotated to enable the mark (black small round point in figure 3) in the multi-core optical fiber to be positioned at a certain self-set fixed position. The indicia is placed in the same area each time a seven-fiber connector is made. And finding a connecting line between the centers of the two farthest fiber cores on the ring with 6 fiber cores, and calculating an included angle theta between the connecting line and the horizontal axis. The metal tail handle is slightly rotated to enable the degree of the included angle theta to be 60 degrees +/-1 degree, and more preferably, the degree of the included angle theta is 60 degrees +/-0.5 degree. And then dispensing and fixing the relative positions of the metal lantern ring and the metal tail handle. The closer θ is to 60 °, the more precise the positioning, the smaller the insertion loss of the connector. Finally, all the parts are assembled. Table 1 below shows the insertion loss per core values for 4 seven-core fiber LC/UPC connectors prepared by this method, with 1 being the middle core. As can be seen from Table 1, the seven-core fiber LC/UPC connector has core losses of less than 0.35dB per core at 1310nm and 1550nm, and preferably, the core losses are less than 0.25dB per core.
TABLE 1 seven-core fiber LC/UPC connector loss per core
Embodiment two: annular six-core optical fiber SC/APC connector
The annular six-core optical fiber shown in fig. 4 has an included angle of 360/6 degrees or 60 degrees between a connecting line between centers of two cores farthest on a ring with 6 cores arranged and a horizontal or vertical axis.
Special ferrules and parts of SC/APC are prepared, noting that the inner bore diameter of the special ferrule needs to match the cladding diameter of the six-core fiber. Removing the coating layer with the length of about 35mm at the front end of the optical fiber with the parts such as the tail sleeve and the like, injecting glue into the metal tail handle of the special ferrule, penetrating the bare optical fiber into the special ferrule, placing the special ferrule on a curing furnace for curing, and grinding the end face of the optical fiber after curing. And horizontally placing the special inserting core, fixing the metal lantern ring by using a special clamp, and observing the position condition of the ground multi-core optical fiber end face by using a high-definition CCD (charge coupled device). And rotating the metal tail handle connected with the bare ferrule to enable the mark (black small dot in figure 4) of the multi-core optical fiber to be positioned at a certain self-set fixed position. The indicia is placed in the same area each time a six-fiber connector is made. And finding a connecting line between the centers of the two farthest fiber cores on the ring with 6 fiber cores, and calculating an included angle theta between the connecting line and the horizontal axis. The metal tail handle is slightly rotated to enable the degree of the included angle theta to be 60 degrees +/-1 degree, and more preferably, the degree of the included angle theta is 60 degrees +/-0.5 degree. And then dispensing and fixing the relative positions of the metal lantern ring and the metal tail handle. The closer θ is to 60 °, the more precise the positioning, the smaller the insertion loss of the connector. Finally, all the parts are assembled. Table 2 below shows the insertion loss per core values for 4 annular six-core fiber SC/APC connectors prepared by this method. As can be seen from Table 2, the annular six-core fiber SC/APC connector has core losses of less than 0.35dB per core at 1310nm and 1550nm, and preferably, the core losses are less than 0.25dB per core.
TABLE 2 annular six-core fiber SC/APC connector loss per core
The third embodiment is as follows: rectangular eight-core optical fiber MU/UPC connector
The rectangular eight core fiber shown in fig. 5 has a transverse core pitch of a and a longitudinal core pitch of b. And an included angle between a connecting line between the centers of the two fiber cores on the maximum rectangular diagonal and the horizontal axis is arctan (b/(3a)) °.
And preparing the special core insert and parts of the MU/UPC, and noting that the inner aperture of the special core insert needs to be matched with the diameter of the rectangular eight-core optical fiber cladding. Removing the coating layer with the length of about 35mm at the front end of the optical fiber with the parts such as the tail sleeve and the like, injecting glue into the metal tail handle of the special ferrule, penetrating the bare optical fiber into the special ferrule, placing the special ferrule on a curing furnace for curing, and grinding the end face of the optical fiber after curing. And horizontally placing the special inserting core, fixing the metal lantern ring by using a special clamp, and observing the position condition of the ground multi-core optical fiber end face by using a high-definition CCD (charge coupled device). The metal tail handle connected with the bare ferrule is rotated to enable the mark (black small circle point in figure 5) of the multi-core optical fiber to be positioned at a certain self-set fixed position. The indicia is placed in the same area each time a rectangular eight-fiber connector is made. And finding a connecting line between the centers of the two farthest fiber cores on the maximum rectangle, and calculating an included angle theta between the connecting line and the horizontal axis. The metal tail handle is slightly rotated to enable the degree of the included angle theta to be arctan (b/(3a)) ° 1 DEG, and more preferably, the degree of the included angle theta to be arctan (b/(3a)) ° 0.5 deg. And then dispensing and fixing the relative positions of the metal lantern ring and the metal tail handle. The closer θ is to arctan (b/(3a)) °, the more accurate the positioning, the smaller the insertion loss of the connector. Finally, all the parts are assembled. Table 3 below shows the insertion loss per core values for 4 rectangular eight-core fiber MU/UPC connectors prepared by this method. As can be seen from Table 3, the rectangular eight-core fiber MU/UPC connector has core losses of less than 0.35dB at both 1310nm and 1550nm, and preferably, has core losses of less than 0.25 dB.
TABLE 3 loss per core for rectangular eight-core fiber MU/UPC connector
The fourth embodiment: nineteen-core optical fiber SC/UPC connector
The nineteen-core fiber shown in fig. 6 has an included angle between a line connecting centers of two cores farthest from each other on a 12-core ring and a vertical axis of 360/12 ° or 30 °.
The special ferrule and parts of the SC/UPC are prepared, and the inner bore diameter of the special ferrule needs to be matched with the cladding diameter of the nineteen-core optical fiber. Removing the coating layer with the length of about 35mm at the front end of the optical fiber with the parts such as the tail sleeve and the like, injecting glue into the metal tail handle of the special ferrule, penetrating the bare optical fiber into the special ferrule, placing the special ferrule on a curing furnace for curing, and grinding the end face of the optical fiber after curing. And horizontally placing the special inserting core, fixing the metal lantern ring by using a special clamp, and observing the position condition of the ground multi-core optical fiber end face by using a high-definition CCD (charge coupled device). The metal tail handle connected with the bare ferrule is rotated to enable the mark (black small round point in figure 6) of the multi-core optical fiber to be positioned at a certain self-set fixed position. The mark is placed in the same region every time the multi-core optical fiber connector is manufactured. And finding a connecting line between the centers of the two farthest fiber cores on the ring with 12 fiber cores, and calculating an included angle theta between the connecting line and the vertical axis. The metal tail handle is slightly rotated to enable the degree of the included angle theta to be 30 degrees +/-1 degree, and more preferably, the degree of the included angle theta is 30 degrees +/-0.5 degree. And then dispensing and fixing the relative positions of the metal lantern ring and the metal tail handle. The closer θ is to 30 °, the more precise the positioning, the smaller the insertion loss of the connector. Finally, all the parts are assembled. Table 4 below shows the insertion loss per core values for 4 nineteen core fiber SC/UPC connectors prepared by this method, with 1 being the middle core. As can be seen from Table 4, the nineteen core fiber SC/UPC connector has core losses of less than 0.45dB per core at 1310nm and 1550nm, and preferably, the core losses are less than 0.3dB per core.
TABLE 4 nineteen core fiber SC/UPC connector loss per core
It should be noted that, according to the implementation requirement, each step/component described in the present application can be divided into more steps/components, and two or more steps/components or partial operations of the steps/components can be combined into new steps/components to achieve the purpose of the present invention.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A method of preparing and aligning a multi-core optical fiber single-core connector, wherein the multi-core optical fiber single-core connector comprises: special lock pin and parts, special lock pin includes: naked lock pin, metal caudal peduncle and metal lantern ring, its characterized in that, naked lock pin with the metal caudal peduncle can freely rotate in the metal lantern ring, the method includes:
injecting glue into the metal tail handle on the special insertion core, penetrating a bare fiber into the special insertion core and curing, grinding the end face of the fiber after curing, horizontally placing the special insertion core, and fixing the metal sleeve ring by using a clamp, wherein the bare fiber is obtained by stripping a coating layer with a preset length at the front end of the multi-core fiber;
observing the positions of each core and the mark in the ground multi-core optical fiber end surface, rotating the metal tail handle connected with the bare ferrule to enable the mark in the multi-core optical fiber end surface to be located at a preset position, finding out the circle centers of two fiber cores with the farthest random distance by observing the positions of each fiber core in the multi-core optical fiber end surface according to the arrangement form of each fiber core in the multi-core optical fiber, calculating the included angle between the connection line of the two circle centers and a horizontal shaft or a vertical shaft, continuously rotating the metal tail handle connected with the bare ferrule to enable the error between the degree of the included angle and the target degree to be within a preset range, then fixing the relative position of the metal sleeve ring and the metal tail handle by dispensing, and finally assembling all loose parts.
2. The method as claimed in claim 1, wherein finding the centers of the two cores farthest from each other by observing the positions of the cores in the polished end face of the multicore fiber according to the arrangement of the cores in the multicore fiber, and determining the included angle between the connecting line of the two centers of the circles and the horizontal axis or the vertical axis comprises:
when the multi-core optical fiber is annularly arranged, the center of any farthest two fiber cores on a ring with n fiber cores arranged in an even number is determined by observing the end face of the multi-core optical fiber, and a first included angle between a connecting line of the two centers of circles and a horizontal axis or a vertical axis is obtained, wherein n is a positive integer.
3. The method of claim 2, wherein the target degree is 0 °, 90 °, or 360/n ° when the multicore fibers are annularly arranged multicore fibers.
4. The method according to claim 1, wherein finding the centers of two farthest-spaced fiber cores by observing the positions of the fiber cores in the ground multi-core fiber end surface according to the arrangement of the fiber cores in the bare fiber, and determining the included angle between the connecting line of the two centers of the two fiber cores and the horizontal axis or the vertical axis comprises:
when the multi-core optical fiber is a multi-core optical fiber which is arranged in a rectangular shape, a second included angle between a connecting line of centers of two fiber cores on a maximum rectangular diagonal line and a horizontal axis or a vertical axis is obtained according to the design of the core spacing of the multi-core optical fiber;
and finding a third included angle between a connecting line between the centers of the two fiber cores on the maximum rectangular diagonal line and the horizontal axis or the vertical axis by observing the end face of the multi-core optical fiber.
5. The method of claim 4, wherein when the multicore fibers are arranged in a rectangular array, the metal ferrule is fixed and the metal tail is rotated such that an error between the third angle and the second angle is within a predetermined range.
6. The method according to any one of claims 1 to 5, wherein an inner bore diameter of the special ferrule matches an outer diameter of the bare fiber stripped of a coating layer.
7. The method of claim 6, wherein the number of cores of the multicore fiber is arbitrary, and the cores of the multicore fiber are symmetrically arranged.
8. The method of claim 7, wherein the cores of the multicore fiber are in a circular or rectangular arrangement.
9. A multicore optical fiber single core connector obtained by the method for preparing and aligning a multicore optical fiber single core connector according to any one of claims 1 to 8.
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| CN201911250589.XA CN111221083B (en) | 2019-12-09 | 2019-12-09 | Multi-core optical fiber single-core connector and preparation and alignment method thereof |
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| CN116609891A (en) * | 2023-06-02 | 2023-08-18 | 上海雍邑光电科技有限公司 | Method for assembling optical fiber connector |
| CN117420642A (en) * | 2023-12-18 | 2024-01-19 | 武汉驿路通科技股份有限公司 | Multi-core optical fiber LC nonstandard connector angle automatic alignment device and method |
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