CN217521388U - Multimode soft jump fiber - Google Patents
Multimode soft jump fiber Download PDFInfo
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- CN217521388U CN217521388U CN202221291658.9U CN202221291658U CN217521388U CN 217521388 U CN217521388 U CN 217521388U CN 202221291658 U CN202221291658 U CN 202221291658U CN 217521388 U CN217521388 U CN 217521388U
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Abstract
The utility model discloses a multimode soft jump fibre, including the optic fibre unit, the optic fibre unit includes from interior to the sandwich layer and the cladding that set gradually outward, the refracting index profile of sandwich layer is parabola shape and the distribution index alpha of parabola is 1.9 ~ 2.1, the refracting index n (r) apart from the point that the sandwich layer central line is r on the sandwich layer satisfies following condition:
wherein n is 0 Is the refractive index of a point on the center line of the core layer, r<R and R are the radius of the core layer. The utility model discloses a refractive index profile to the sandwich layer is parabola shape and the refractive index of sandwich layer carries out the rational design to assist with the covering outside the sandwich layer, improved the bending loss, can satisfy optical fiber communication system's high rate, large capacity, long distance transmission's demand.
Description
Technical Field
The utility model belongs to the optic fibre field, more specifically relates to a multimode soft jump is fine.
Background
The jumping fiber is also called an optical fiber jumping wire, connector plugs are arranged at two ends of the optical cable, and the structure of the jumping fiber comprises an optical fiber/optical cable body and optical fiber connectors arranged at two ends of the optical fiber/optical cable body. The optical path connection device has the function of realizing the optical path movable connection from equipment to an optical fiber wiring link, is generally used for the connection between an optical transceiver and a terminal box, and is applied to the fields of optical fiber communication systems, optical fiber data transmission, local area networks and the like. According to the optical waveguide structure of the optical fiber in the jump fiber, the jump fiber is divided into single-mode jump fiber and multi-mode jump fiber.
As is well known, optical modules with operating wavelengths of 1310nm and 1550nm are generally suitable for medium and long distance transmission and are connected with single-mode optical fibers; the multimode optical fiber has lower fiber loss ratio in the interval with the working wavelength of 850nm, the attenuation value is about 2.4dB/km, the loss of 100 meters is about 0.24dB, and an optical module with the working wavelength of 850nm is mainly used for short-distance transmission and is connected with the multimode optical fiber. The multimode optical fiber has the advantages of large optical fiber core diameter, use of cheaper light sources and connectors and the like, and is commonly used in the application scene of short-distance transmission.
In the prior art, the multimode jump fiber mainly has the following defects: single mode transmission cannot be considered and the signal is easily subjected to higher loss due to bending during transmission.
SUMMERY OF THE UTILITY MODEL
To the above defect of prior art or improve the demand, the utility model provides a multimode soft jump fibre, its refractive index through the refracting index profile to the sandwich layer of optical fiber unit and sandwich layer carries out reasonable design to dispose the three-layer covering outside the sandwich layer, maintained the excellent decay performance of optical fiber unit under the bending condition.
To achieve the above object, according to an aspect of the present invention, there is provided a multimode soft jump fiber, which comprises an optical fiber unit, the optical fiber unit including a core layer and a cladding layer sequentially arranged from inside to outside, wherein:
the refractive index profile of the core layer is parabolic, the distribution index alpha of the parabola is 1.9-2.1, and the refractive index n (r) of a point on the core layer, which is r away from the central line of the core layer, meets the following conditions:
wherein n is 0 Is the refractive index of a point on the centerline of the core layer, r<R and R are the radius of the core layer.
Preferably, the radius R of the core layer is 12-25 μm;
the cladding comprises three layers, namely a first cladding, a second cladding and a third cladding, wherein the first cladding, the second cladding and the third cladding are sequentially arranged from inside to outside;
single edge width delta of the first cladding 1 0.5 to 3 μm, a single side width Δ 2 of the second cladding layer of 3 to 12 μm, and an outer diameter D3 of the third cladding layer of 80 to 200 μm.
Preferably, the third cladding layer has an outer diameter of 124 to 126 μm.
Preferably, the refractive indices of the first cladding layer, the second cladding layer and the third cladding layer are n1, n 2 And n 3 ，n 1 <n 2 ≤n 3 <n 0 And n is 0 -n 3 ＝0.0073～0.0080，n 3 -n 2 ＝0～0.0073，n 3 -n 1 ＝0.0073～0.0131。
Preferably, the core layer, the first cladding layer and the second cladding layer are all germanium-fluorine co-doped silica glass layers or all fluorine-doped silica glass layers;
the third cladding is a pure silica glass layer, or the third cladding is a silica glass layer doped with fluorine and/or chlorine.
Preferably, the optical fiber unit has a bandwidth of 500MHz-km or more in a wavelength range of 850nm to 1300 nm.
Preferably, the fibre unit causes a bend additional attenuation of typically less than or equal to 0.15dB at a wavelength of 850nm, around 1 turn with a bend radius of 10 mm.
Preferably, the fiber unit causes a typical bend-added attenuation of less than or equal to 0.05dB at a wavelength of 850nm, with a bend radius of 10mm, for 1 turn.
Preferably, the sleeve sleeved on the optical fiber unit is a tight sleeve.
Preferably, the connector connected with the end of the optical fiber unit is installed on the plug main body, and a tail pipe is installed on the plug main body, and the tail pipe is sleeved on the optical cable containing the optical fiber unit and has a hollow structure.
Generally, through the utility model discloses above technical scheme who conceives compares with prior art, can gain following beneficial effect:
1) the utility model discloses a refractive index profile to the parabola shape of sandwich layer and the refractive index of sandwich layer carry out the rational design, make the soft bandwidth more than 500MHz-km that can all be obtained to the multimode jump fibre in 850nm wavelength to 1300nm wavelength range, and the bandwidth performance, obtain the balance between the cost, obtain enough high bandwidth parameter under the mature stable technological condition, the crooked requirement to the soft fine crooked of jumping in the practical application environment of jumping under obtaining enough high bandwidth parameter prerequisite, bending loss has been improved, can satisfy optical fiber communication system's high speed, large capacity, long distance transmission's demand.
2) The utility model discloses carry out rational design to the refracting index of three covering, combine together with the improvement that the design of sandwich layer refracting index was made for optical fiber unit bending property is good.
Drawings
Fig. 1 is a schematic view of a refractive index profile structure of a multimode soft hop fiber according to the present invention;
fig. 2 is a schematic structural diagram of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
Referring to fig. 1 and 2, a multimode soft jumper fiber includes an optical fiber unit including a core layer and a cladding layer sequentially arranged from inside to outside, wherein:
the refractive index profile of the core layer is parabolic, the distribution index alpha of the parabola is 1.9-2.1, and the refractive index n (r) of a point on the core layer, which is r away from the central line of the core layer, meets the following conditions:
wherein n is 0 Is the refractive index of a point on the center line of the core layer, r<R and R are the radius of the core layer.
Higher bandwidth parameters can be obtained by the preference of the alpha value. In some embodiments, the preferred alpha value is 1.97 to 2.03, and more preferably the alpha value is 1.976 to 1.984.
The utility model discloses a refractive index profile to the parabola shape of sandwich layer and the refractive index of sandwich layer carry out the rational design for the multimode is soft jumps the fibre and can all obtain the bandwidth more than 500MHz-km in 850nm wavelength to 1300nm wavelength range, and the bandwidth performance, obtain the balance between the cost, obtain enough high bandwidth parameter under the stable technological condition of maturity, the crooked requirement to soft jumps the fibre in the practical application environment of having taken into account under the bandwidth parameter prerequisite of obtaining enough high, bending loss has been improved, can satisfy optical fiber communication system's high speed, large capacity, long distance transmission's demand.
Further, the radius R of the core layer is 12-25 μm;
the cladding comprises three layers, namely a first cladding, a second cladding and a third cladding, wherein the first cladding, the second cladding and the third cladding are sequentially arranged from inside to outside;
single edge width delta of the first cladding 1 ＝R 1 -0.5 to 3 μm, single-sided width Δ of said second cladding layer 2 ＝R 2 -R 1 3-12 μm, and the outer diameter D of the third cladding layer 3 80 to 200 μm, preferably 124 to 126 μm, then R 3 ＝D 3 (ii) 40 to 100 μm, wherein R 1 、R 2 、R 3 Respectively representing half the outer diameter of the first cladding, half the outer diameter of the second cladding and half the outer diameter of the third cladding. With the adoption of the size design, the jump fiber has excellent bending performance. Bending stress is dispersed by the two cladding layers close to the core layer, so that the stress distribution of the core layer of the optical fiber under the bending condition is kept at a low value, and further, the high transmission bandwidth of the optical fiber under the bending condition is kept.
Further, the refractive index of the first cladding layer, the second cladding layer and the third cladding layer is n 1 、n 2 And n 3 ，n 1 <n 2 ≤n 3 <n 0 And n is 0 -n 3 ＝0.0073～0.0080，n 3 -n 2 ＝0～0.0073，n 3 -n 1 0.0073-0.0131. The utility model discloses carry out rational design to the refracting index of three covering, combine together with the improvement that the design of sandwich layer refracting index was made for optical fiber unit bending property is good. Preferred core refractive index n 0 A preferred third cladding refractive index n of 1.4692-1.4750 3 1.4567 to 1.4573. By designing the first cladding of the optical fiber unit as a deeper sunken layer, the leakage of optical power in the core layer can be restrained, the deviation of an alpha value in the bending state of the optical fiber can be slowed down, and the bandwidth stability of the optical fiber in bending can be further maintained.
Further, the core layer, the first cladding layer and the second cladding layer are all silica glass layers doped with germanium and fluorine, or are all silica glass layers doped with fluorine;
the third cladding is a pure silica glass layer, or the third cladding is a silica glass layer doped with fluorine and/or chlorine.
Further, the optical fiber unit has a bandwidth of 500MHz-km or more in a wavelength range of 850nm to 1300nm, and the optical fiber unit causes a bending additional attenuation representative value of 0.15dB or less, preferably 0.05dB or less at a wavelength of 850nm by winding 1 turn at a bending radius of 10 mm.
The multimode soft hop fiber mainly comprises two parts of structures: an optical cable 1 and a connection plug arranged at the end of the optical cable. The optical cable 1 is provided with a plurality of optical fiber units, an aramid fiber layer wrapping each optical fiber unit and an outer sheath arranged outside the aramid fiber layer. And the sleeve sleeved on each optical fiber unit is a tight sleeve.
In this embodiment, the connecting plug includes plug main body 2, lock pin 3 and a plurality of LC connector 7 of setting in plug main body 2 one end, tail pipe 4 and area pressure ring pyrocondensation pipe 5 of setting at the plug main body 2 other end, wherein, LC connector 7, lock pin 3 isotructures all adopt current ripe structure, two LC connectors 7 set up side by side, lock pin 3 in LC connector 7 and the tip of two optical fiber unit in the optical cable 1 pass through epoxy glue fixed connection, LC connector 7 is installed on plug main body 2, LC connector 7 has and presses the shell fragment, press the shell fragment to install in plug main body 2 front end below, press plug main body 2 front end to drive and press the shell fragment to push down.
The pressure ring position of the front end of the pressure ring heat shrinkable tube 5 is fixedly connected with the tail end of the plug main body 2, the optical cable containing the optical cable is fixedly subjected to heat shrinkage at the rear end of the pressure ring heat shrinkable tube 5, the front end of the tail tube 4 is installed at the pressure joint of the pressure ring heat shrinkable tube 5, the tail tube 4 is sleeved on the optical cable containing the optical fiber unit, the tail end of the tail tube 4 is of a hollow structure, and the optical fiber unit is maintained to have excellent attenuation performance under the condition of side pulling.
The present embodiment also includes a dust cap 6 that mates with the ferrule 3. The dustproof cap 6 is mainly used for protecting the plug core 3 from dust when the jumping fiber is not in use, and the use effect of the equipment is prevented from being influenced by dust.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The multimode soft jump fiber is characterized by comprising an optical fiber unit, wherein the optical fiber unit comprises a core layer and a cladding layer which are arranged from inside to outside in sequence, wherein:
the refractive index profile of the core layer is parabolic, the distribution index alpha of the parabola is 1.9-2.1, and the refractive index n (r) of a point on the core layer, which is r away from the central line of the core layer, meets the following conditions:
wherein n is 0 Is the refractive index of a point on the center line of the core layer, r<R and R are the radius of the core layer.
2. The multimode pigtail of claim 1, wherein the radius R of the core layer is 12 μm to 25 μm;
the cladding comprises three layers, namely a first cladding, a second cladding and a third cladding, wherein the first cladding, the second cladding and the third cladding are sequentially arranged from inside to outside;
single edge width delta of the first cladding 1 0.5-3 μm, and a single-sided width Δ of the second cladding 2 3 μm to 12 μm, the outer diameter D of the third cladding layer 3 Is 80-200 μm.
3. The multimode pigtail of claim 2, wherein the third cladding has an outer diameter of 124 μm to 126 μm.
4. The multimode pigtail of claim 2, wherein the first, second, and third cladding have a refractive index n 1 、n 2 And n 3 ，n 1 <n 2 ≤n 3 <n 0 And n is 0 -n 3 ＝0.0073～0.0080，n 3 -n 2 ＝0～0.0073，n 3 -n 1 ＝0.0073～0.0131。
5. The multimode pigtail of claim 2, wherein the core layer, the first cladding layer, and the second cladding layer are all germanium-fluorine co-doped silica glass layers, or are all fluorine-doped silica glass layers;
the third cladding is a pure silica glass layer, or the third cladding is a silica glass layer doped with fluorine and/or chlorine.
6. The multimode pigtail of claim 1, wherein the fiber unit has a bandwidth of 500MHz-km or more in a wavelength range of 850nm to 1300 nm.
7. The multimode pigtail of claim 1, wherein the fiber unit causes a bend-added attenuation representative of 0.15dB or less at a wavelength of 850nm for 1 turn at a bend radius of 10 mm.
8. The multimode pigtail of claim 1, wherein the fiber unit causes a bend-added attenuation representative of 0.05dB or less at a wavelength of 850nm for 1 turn at a bend radius of 10 mm.
9. The multimode soft hop fiber of claim 1, wherein the ferrule received on the fiber unit is a tight ferrule.
10. The multimode soft hop fiber according to claim 1, wherein the connector for connecting the ends of the optical fiber units is mounted on the plug body and the tail tube is mounted on the plug body, the tail tube is sleeved on the optical cable containing the optical fiber units and the tail tube has a hollow structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221291658.9U CN217521388U (en) | 2022-05-26 | 2022-05-26 | Multimode soft jump fiber |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221291658.9U CN217521388U (en) | 2022-05-26 | 2022-05-26 | Multimode soft jump fiber |
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| CN217521388U true CN217521388U (en) | 2022-09-30 |
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| CN202221291658.9U Active CN217521388U (en) | 2022-05-26 | 2022-05-26 | Multimode soft jump fiber |
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- 2022-05-26 CN CN202221291658.9U patent/CN217521388U/en active Active
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