CN102096147A - Symmetrically structured multi-core fibers capable of being welded together and manufacturing method thereof - Google Patents
Symmetrically structured multi-core fibers capable of being welded together and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses a multi-core fiber, in particular symmetrically structured multi-core fibers capable of being welded together and a manufacturing method thereof. The structure of the multi-core fibers provided by the invention comprises a core area part (101), which is positioned in the centre of the fibers and has polarization maintaining characteristics, a plurality of fiber cores (102) distributed symmetrically, a common cladding (103) and a coating (104). The welding principle of the multi-core fibers is that two polarization spindles of two polarization keeping fibers must be aligned when a common polarization keeping fiber joint welder is used for welding the polarization keeping fibers. Due to the high symmetry of the fiber core distribution of the multi-core fiber with the structure, as long as the polarization spindles of the central fiber cores are aligned when welding, the other fiber cores are naturally aligned, so the low-consumption welding effect of the multi-core fiber is achieved.
Description
Technical field
The present invention relates to the basic area of optical fiber communication---optical fiber, specifically invent symmetrical structure multi-core fiber of a kind of weldable based on the polarization-maintaining fiber fusion techniques and preparation method thereof.
Background technology
Common optical fiber is to constitute by a core region with around its clad region.But multi-core fiber (Multi-Core Fiber) is to have a plurality of fibre cores in the common clad region, and multi-core fiber can be used to make optical device and be used for communications.
Existing at home and abroad for the research of multi-core fiber at present, the appearance of multi-core fiber will certainly be injected new vitality to optical fiber communication, be that increase in message capacity also is being all to be better than single-core fiber on the integrated level, but have an important problem to solve, that is exactly the problem that continues of multi-core fiber.We know that the loss of optical fiber is nothing more than two kinds of situations, and a kind of is that optical fiber intrinsic factor is that internal cause causes, and another kind is that extrinsic factor is that external cause causes.And the connecting loss in the external cause is one of important parameter that influences the optical fiber telecommunications system performance index, and the size of loss directly has influence on the transmission quality of optical fiber telecommunications system.If loss is too big, not only can cause serious reception error code but also also can improve, thereby also will improve the cost of total system greatly the requirement of receiving equipment, will make that like this research to multi-core fiber loses meaning.
Because common multi-core fiber is in the optical fiber a plurality of fuses to be arranged, require all will have in each fuse the signal transmission, so when continuing, must make each fuse all will reach the degree of registration of single-core fiber when continuing and estimation connecting loss size, continuing of multi-core fiber just faces very big difficulty like this, common optical fiber splicer can not meet the demands, and will occur cost increase problem again if invent special heat sealing machine again.
Summary of the invention
The objective of the invention is to propose a kind of symmetrical structure multi-core fiber of weldable, this optical fiber can use the splice loss, splice attenuation of common polarization-maintaining fiber heat sealing machine welding and each fibre core and common single-core fiber basic identical.
The present invention is based on the symmetrical structure multi-core fiber of the weldable of polarization-maintaining fiber fusion techniques, and its feature is that the denominator of collection polarization-maintaining fiber and multi-core fiber designs.
The present invention has taked following technical scheme: the structure of optical fiber comprises the core district part 101 with polarization retention performance, a plurality of fibre cores 102, public covering 103 and the coat 104 that is symmetrically distributed; The center that is centered close to multi-core fiber that wherein has the core district part 101 of polarization retention performance, a plurality of fibre cores 102 be distributed in core district part 101 around, and on any one xsect of multi-core fiber, it is on the circumference in the center of circle that a plurality of fibre cores 102 are evenly distributed on a center with multi-core fiber.Because a plurality of fibre cores are to be symmetrically distributed in around the core district with polarization retention performance, the characteristic that two polarization axles must align when utilizing the polarization-maintaining fiber welding, a plurality of fibre cores natures are to it, and the splice loss, splice attenuation of each fibre core and single-core fiber are basic identical.Described core district part 101 with polarization retention performance can be panda type, knot type, oval cladding type, oval core pattern, rectangular like type or yi word pattern.
A kind of method for making of symmetrical structure multi-core fiber of weldable is characterized in that this method comprises the steps: 1) making polarization-maintaining fiber prefabricated rods; 2) make a plurality of fibre core prefabricated rods, the polarization-maintaining fiber prefabricated rods length that makes in the length of fibre core prefabricated rods and the step 1) is identical; 3) open and step 2 on the polarization-maintaining fiber prefabricated rods that in step 1), makes) in the rectangular channel that equates of the fibre core prefabricated rods number that makes, rectangular channel is along the elongated layout of the axial direction of polarization-maintaining fiber prefabricated rods, and rectangular channel is symmetrically distributed with respect to the center of polarization-maintaining fiber prefabricated rods; 4) with step 2) in the fibre core prefabricated rods that obtains clean with drying after, with its inserting step 4 respectively) in the rectangular channel opened; 5) at last with the whole prefabricated rods one end sintering that obtains in the step 4), wire drawing then obtains the symmetrical structure multi-core fiber based on the weldable of polarization-maintaining fiber.
A kind of method for making of symmetrical structure multi-core fiber of weldable, this method comprises the steps: 1) making polarization-maintaining fiber prefabricated rods; 2) make a plurality of fibre core prefabricated rods, the polarization-maintaining fiber prefabricated rods length that makes in the length of fibre core prefabricated rods and the step 1) is identical; 3) with step 2) in after the fibre core prefabricated rods that makes carries out cleaning-drying, it is arranged in the polarization-maintaining fiber prefabricated rod cladding periphery that makes in the step 1) symmetrically, and then at the outer race quartz glass sleeve of a plurality of fibre core prefabricated rods of having arranged; 4) at last with the whole prefabricated rods one-stage sintering that obtains in the step 3), wire drawing then obtains the symmetrical structure multi-core fiber based on the weldable of polarization-maintaining fiber.
In terms of existing technologies, the advantage of this multi-core fiber is can be with the welding of existing polarization-maintaining fiber heat sealing machine, the splice loss, splice attenuation of each fibre core and the splice loss, splice attenuation of common single-core fiber are basic identical, and this multi-core fiber has had the characteristic of common multi-core fiber and polarization-maintaining fiber simultaneously.
Description of drawings
Fig. 1 is the symmetrical structure multi-core fiber synoptic diagram of weldable;
Fig. 2 panda type polarization-maintaining fiber prefabricated rods synoptic diagram;
Fig. 3 fibre core prefabricated rods and pure quartz pushrod filling material synoptic diagram;
Fig. 4 panda type polarization-maintaining fiber prefabricated rods fluting synoptic diagram (this is exemplified as out 6 grooves);
Fig. 5 is based on the symmetrical structure 6 core fibre prefabricated rods synoptic diagram of the weldable of panda type polarization-maintaining fiber;
Fig. 6 is based on the symmetrical structure 6 core fibre synoptic diagram of the weldable of panda type polarization-maintaining fiber;
The oval core pattern polarization-maintaining fiber prefabricated rods synoptic diagram that Fig. 7 covering is not too big;
Fig. 8 is based on the symmetrical structure 8 core fibre prefabricated rods synoptic diagram of the weldable of oval core pattern polarization-maintaining fiber;
Fig. 9 is based on the symmetrical structure 8 core fibre synoptic diagram of the weldable of oval core pattern polarization-maintaining fiber;
Among the figure: 1, fibre core, 2, the stressed zone, 3, covering, 4, the fibre core prefabricated rods, 5, fibre core, 6, the preform filling material, 7, oval fibre core, 8, sleeve pipe, 101, the core district part that has the polarization retention performance, 102, a plurality of fibre cores of being symmetrically distributed, 103, public covering, 104, coat.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, structure of the present invention comprises the core district part 101 with polarization retention performance that is positioned at fiber optic hub, a plurality of fibre cores 102, public covering 103 and the coat 104 that is symmetrically distributed.
As Fig. 4, shown in Figure 5, have the rectangular channel that equates with fibre core prefabricated rods number in the side of polarization-maintaining fiber prefabricated rods, rectangular channel is that the center along the circumferential direction evenly distributes with the fibre core of polarization-maintaining fiber, all is provided with a fibre core prefabricated rods in each rectangular channel.
As shown in Figure 8, the fibre core prefabricated rods is the center with the fibre core of polarization-maintaining fiber, evenly arranges along the side of polarization-maintaining fiber, is provided with quartz glass sleeve 8 in fibre core prefabricated rods outside.
The version of the multi-core fiber among the present invention is unrestricted, and method for making is versatile and flexible.Can adopt fluting method on the polarization-maintaining fiber prefabricated rods (behind symmetric position fluting selected on the polarization-maintaining fiber prefabricated rods, put into the fibre core prefabricated rods and make the multi-core fiber prefabricated rods), the sub-tiretube process of symmetric offset spread multicore (on the polarization-maintaining fiber prefabricated rods selected symmetric position fixedly the fibre core prefabricated rods then the method for sleeve pipe make the multi-core fiber prefabricated rods) etc.
A kind of method for making of symmetrical structure multi-core fiber of weldable, this method comprises the steps: 1) making polarization-maintaining fiber prefabricated rods; 2) make a plurality of fibre core prefabricated rods 4, the polarization-maintaining fiber prefabricated rods length that makes in the length of fibre core prefabricated rods and the step 1) is identical; 3) open and step 2 on the polarization-maintaining fiber prefabricated rods that in step 1), makes) in the rectangular channel that equates of fibre core prefabricated rods 4 numbers that make, rectangular channel is along the elongated layout of the axial direction of polarization-maintaining fiber prefabricated rods, and rectangular channel is symmetrically distributed with respect to the center of polarization-maintaining fiber prefabricated rods; 4) with step 2) in the fibre core prefabricated rods 4 that obtains clean with drying after, with its inserting step 4 respectively) in the rectangular channel opened; 5) at last with the whole prefabricated rods one end sintering that obtains in the step 4), wire drawing then obtains the symmetrical structure multi-core fiber based on the weldable of polarization-maintaining fiber.
A kind of method for making of symmetrical structure multi-core fiber of weldable, this method comprises the steps: 1) making polarization-maintaining fiber prefabricated rods; 2) make a plurality of fibre core prefabricated rods 4, the polarization-maintaining fiber prefabricated rods length that makes in the length of fibre core prefabricated rods and the step 1) is identical; 3) with step 2) in after the fibre core prefabricated rods that makes carries out cleaning-drying, it is arranged in the polarization-maintaining fiber prefabricated rod cladding periphery that makes in the step 1) symmetrically, and then at the outer race quartz glass sleeve; 4) at last with the whole prefabricated rods one-stage sintering that obtains in the step 3), wire drawing then obtains the symmetrical structure multi-core fiber based on the weldable of polarization-maintaining fiber.
Polarization-maintaining fiber is to have the optical fiber that keeps the polarization state ability, and polarization-maintaining fiber can be divided into panda type, oval core pattern, knot type, oval cladding type, rectangular like type and yi word pattern etc. according to the stressed zone structure type.The fusion techniques of polarization-maintaining fiber is very ripe, and welding polarization axle error angle is less than 0.5 during present polarization-maintaining fiber heat sealing machine welding, and connecting loss reaches 0.06dB, and the extinction ratio of introducing that continues is degenerated in 0.1dB.Must two principle design that polarization principal axis aligns when the symmetrical structure multi-core fiber of weldable utilizes the polarization-maintaining fiber welding, only need aliging the polarization principal axis of the central core of two optical fiber then when welding, each fuse of multi-core fiber aligns naturally.The basic structure of the symmetrical structure multi-core fiber of weldable is: the center of optical fiber is to be made of the core district with polarization retention performance, core district with polarization retention performance can be oval core pattern, panda type, knot type, oval cladding type, rectangular like type and yi word pattern etc., be a plurality of fibre cores that are used for the signal transmission that are symmetrically distributed outward, and on any one xsect of optical fiber, it is on the circumference in the center of circle that a plurality of fibre cores are evenly distributed on a center with multi-core fiber.The fibre core number can set up on their own according to needs, and for example when the fibre core number was 3,3 fibre cores laid respectively at each vertex position place of an inscribed equilateral triangle; When the fibre core number was 4,4 fibre cores laid respectively at foursquare each vertex position place of inscribed; By that analogy.The distance of each fibre core spacing covering excircle also can set up on their own.Booster action when the polarization-maintaining fiber fibre core at this multi-core fiber center can only be used for welding in addition also can be used for transmission signals light.
The symmetrical structure multi-core fiber method for making of weldable is also uncomplicated, its method for making is based upon on the method for making of polarization-maintaining fiber, generally be to produce the polarization-maintaining fiber prefabricated rods earlier according to the manufacturing process of polarization-maintaining fiber earlier, symmetry is added a plurality of fuses on the prefabricated rods of producing then, concrete adoptable method has fluting method on the polarization-maintaining fiber prefabricated rods, many fibre cores of symmetric offset spread tiretube process etc., and then this prefabricated rods one end is sintered to fix, just made the symmetrical structure multi-core fiber prefabricated rods of weldable.On wire-drawer-tower, carry out at last the symmetrical structure multi-core fiber that wire drawing obtains weldable.The ready-made in advance single fibre core prefabricated rods of selecting for use when making this multi-core fiber prefabricated rods of a plurality of fibre cores is blocked and is obtained, so each fibre core has identical performance parameter.When making the symmetrical structure multi-core fiber prefabricated rods of weldable, the number of concrete fibre core can be determined as required, will carry out in strict accordance with the method described in the summary of the invention when still arranging.
Fig. 1 is the symmetrical structure multi-core fiber and the cross sectional representation thereof of weldable, and wherein the fibre core number of Dui Chengfenbuing is 4.This multi-core fiber by the core district 101 that is positioned at fiber optic hub (comprising fibre core 1 and stressed zone 2) with polarization retention performance, to be symmetrically distributed in one be that 4 fibre cores 102, covering 103 and the coat 104 that connect on the square vertices of the circle in the center of circle constitutes with the fiber optic hub.Have fibre core 1 in the core district 101 of the polarization retention performance booster action both can be used for the welding of this multi-core fiber the time, can be used to transmit polarized light again, make the purposes of this optical fiber more extensive.4 fibre cores 102 be symmetrically distributed in a circumference in connect on the summit of regular polygon.Each fibre core is to block gained by a prefabricated rods, has identical parameter and character.
Embodiment 1:
Making is based on the symmetrical structure multi-core fiber (this is exemplified as 6 cores) of the weldable of panda type polarization-maintaining fiber.Step is as follows:
1) make panda type polarization-maintaining fiber prefabricated rods, as shown in Figure 2, its by fibre core 1, mix B stressed zone 2 and covering 3 constitutes.Wherein the dimension scale of fibre core 1 and covering 3 is made in pre-designed ratio, and measures the size of covering 3.Because concrete manufacturing process is very ripe, does not give unnecessary details at this.
2) the fibre core prefabricated rods 4 of making band portion covering.At first calculate the size of fibre core 6 in the fibre core prefabricated rods 4 that will make according to the core bag ratio of the multi-core fiber of reserving in advance according to the size of above-mentioned covering 3.Adopt MCVD method (improved chemical meteorology deposition method) to make the bigger prefabricated rods of fibre core then, then the wherein size of fibre core elongated and monitored in its fusion, up to calculate the measure-alike of the fibre core 6 that will obtain, stop to draw high.The prefabricated rod cladding that obtains is eroded to certain thickness, do polishing and measure its diameter.Be cut into length and the above-mentioned identical plurality of sections of panda type polarization-maintaining fiber prefabricated rods that makes at last, as fibre core prefabricated rods 4, as shown in Figure 3.
3) make the pure quartz pushrod of plurality of sections, its diameter is less than or equal to the cladding diameter of fibre core prefabricated rods 4, as preform filling material 6.
4) direction that parallels to the axis in the above-mentioned panda type polarization-maintaining fiber prefabricated rods upper edge that makes is opened 6 rectangular channels, these 6 rectangular channels are symmetrically distributed, and the perpendicular bisector that satisfies the base of 6 grooves on any one cross section by the prefabricated rod cladding excircle connects orthohexagonal summit in concentrically ringed.Be illustrated in figure 4 as prefabricated rods fluting cross sectional representation.Wherein the degree of depth of groove is decided according to the actual requirements, and width is identical with the cladding diameter of the above-mentioned fibre core prefabricated rods 4 that obtains.
5) from the above-mentioned plurality of sections fibre core prefabricated rods that obtains, select 6 sections and select the pure quartz pushrod filling material of plurality of sections, it is cleaned and drying, then it is inserted into respectively in above-mentioned 6 rectangular channels opening, inserts the fibre core prefabricated rods in each rectangular channel earlier, then fill with pure quartz pushrod.Be illustrated in figure 5 as the prefabricated rods cross sectional representation that obtains after the filling.With whole prefabricated rods one end sintering, obtain the symmetrical structure multi-core fiber prefabricated rods of weldable at last.
6), obtain symmetrical structure multi-core fiber, as shown in Figure 6 based on the weldable of panda type polarization-maintaining fiber with the above-mentioned prefabricated stick drawn wire that makes.
Embodiment 2:
Making is based on the symmetrical structure multi-core fiber (this is exemplified as 8 cores) of the weldable of oval core pattern polarization-maintaining fiber, and concrete steps are as follows:
1) make the not too big oval core pattern polarization-maintaining fiber prefabricated rods of covering, as shown in Figure 7, it is made up of oval fibre core 7 and covering 3.Measure its cladding diameter.Because concrete manufacturing process is very ripe, does not give unnecessary details at this.
2) make the fibre core prefabricated rods 4 that has the part covering.Adopt the MCVD legal system to make the bigger prefabricated rods of fibre core, then its fusion is elongated to fibre core 5 wherein and be certain reduced size (size does not have hard and fast rule) herein, stop to draw high and measuring 5 diameter.The prefabricated rod cladding that obtains is eroded to certain less thickness, do polishing and measure its diameter.Be cut into length and the above-mentioned identical plurality of sections of oval core pattern polarization-maintaining fiber prefabricated rods that makes at last, as fibre core prefabricated rods 4.
3) make the pure quartz pushrod of plurality of sections, its diameter equals the cladding diameter of the above-mentioned fibre core prefabricated rods 4 that makes, as preform filling material 6.
4) from the above-mentioned plurality of sections fibre core prefabricated rods that obtains, select 8 sections and select the pure quartz pushrod of plurality of sections, with its cleaning and drying.8 sections fibre core prefabricated rods selecting are arranged in ready-made oval core pattern polarization-maintaining fiber prefabricated rod cladding periphery symmetrically, and concrete arrangement method is:
I) on the excircle of the xsect of oval core pattern polarization-maintaining fiber prefabricated rods, find 8 points, these 8 point symmetries be distributed in this prefabricated rods excircle in connect on the summit of octagon.
Ii) 8 fibre core prefabricated rods are prolonged at 8 selected on oval core pattern polarization-maintaining fiber prefabricated rods symmetric points places and be parallel to axial direction and be fixed on the oval core pattern polarization-maintaining fiber prefabricated rods, remainder is filled with quartz pushrod.
Iii) by the diameter of the above-mentioned oval core pattern polarization-maintaining fiber prefabricated rods that records, the diameter of the cladding diameter of fibre core prefabricated rods 4 and fibre core 5 than drawing total prefabricated rod cladding size, and then obtains the size of required sleeve pipe according to the multi-core fiber core bag that finally will obtain.Size Selection quartz glass sleeve according to the required sleeve pipe 8 that calculates gained is enclosed within above-mentioned prefabricated rods periphery.With the one section sintering, obtain symmetrical structure multi-core fiber prefabricated rods, as shown in Figure 8 based on the weldable of oval core pattern polarization-maintaining fiber.
Iv), obtain symmetrical structure multi-core fiber, as shown in Figure 9 based on the weldable of oval core pattern polarization-maintaining fiber with above-mentioned prefabricated stick drawn wire.
More than symmetrical structure multi-core fiber of a kind of weldable provided by the present invention and preparation method thereof is described in detail, used specific embodiment herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, part in specific embodiments and applications all can change.In sum, this description should not be construed as limitation of the present invention.
Claims (4)
1. the symmetrical structure multi-core fiber of a weldable is characterized in that, comprises the core district part (101) with polarization retention performance, a plurality of fibre cores (102), public covering (103) and the coat (104) that is symmetrically distributed; The center that is centered close to multi-core fiber that wherein has the core district part (101) of polarization retention performance, a plurality of fibre cores (102) be distributed in core district part (101) around, and on any one xsect of multi-core fiber, it is on the circumference in the center of circle that a plurality of fibre cores (102) are evenly distributed on a center with multi-core fiber.
2. the symmetrical structure multi-core fiber of a kind of weldable according to claim 1 is characterized in that, described core district part (101) with polarization retention performance is panda type, knot type, oval cladding type, oval core pattern, rectangular like type or yi word pattern.
3. the method for making of the symmetrical structure multi-core fiber of a kind of weldable as claimed in claim 1 is characterized in that, this method comprises the steps:
1) makes the polarization-maintaining fiber prefabricated rods;
2) make a plurality of fibre core prefabricated rods, the polarization-maintaining fiber prefabricated rods length that makes in the length of fibre core prefabricated rods and the step 1) is identical;
3) open and step 2 on the polarization-maintaining fiber prefabricated rods that in step 1), makes) in the rectangular channel that equates of the fibre core prefabricated rods number that makes, rectangular channel is along the elongated layout of the axial direction of polarization-maintaining fiber prefabricated rods, and rectangular channel is symmetrically distributed with respect to the center of polarization-maintaining fiber prefabricated rods;
4) with step 2) in the fibre core prefabricated rods 4 that obtains clean with drying after, with its inserting step 4 respectively) in the rectangular channel opened;
5) at last with the whole prefabricated rods one end sintering that obtains in the step 4), wire drawing then obtains the symmetrical structure multi-core fiber based on the weldable of polarization-maintaining fiber.
4. the method for making of the symmetrical structure multi-core fiber of a kind of weldable as claimed in claim 1 is characterized in that, this method comprises the steps:
1) makes the polarization-maintaining fiber prefabricated rods;
2) make a plurality of fibre core prefabricated rods, the polarization-maintaining fiber prefabricated rods length that makes in the length of fibre core prefabricated rods and the step 1) is identical;
3) with step 2) in after the fibre core prefabricated rods that makes carries out cleaning-drying, it is arranged in the polarization-maintaining fiber prefabricated rod cladding periphery that makes in the step 1) symmetrically, and then at the outer race quartz glass sleeve of a plurality of fibre core prefabricated rods of having arranged;
4) at last with the whole prefabricated rods one end sintering that obtains in the step 3), wire drawing then obtains the symmetrical structure multi-core fiber based on the weldable of polarization-maintaining fiber.
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Application publication date: 20110615 |