CN1300607C - Bending insensitive optical fiber and preparing method thereof - Google Patents

Bending insensitive optical fiber and preparing method thereof Download PDF

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CN1300607C
CN1300607C CNB2004100613929A CN200410061392A CN1300607C CN 1300607 C CN1300607 C CN 1300607C CN B2004100613929 A CNB2004100613929 A CN B2004100613929A CN 200410061392 A CN200410061392 A CN 200410061392A CN 1300607 C CN1300607 C CN 1300607C
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optical fiber
covering
microns
refractive index
radius
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CN1632628A (en
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李诗愈
成煜
陆大方
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FiberHome Fujikura Optical Fiber Technology Co., Ltd.
Fiberhome Telecommunication Technologies Co Ltd
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Fiberhome Telecommunication Technologies Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/012—Manufacture of preforms for drawing fibres or filaments
    • C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
    • C03B37/018—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD] by glass deposition on a glass substrate, e.g. by inside-, modified-, plasma-, or plasma modified- chemical vapour deposition [ICVD, MCVD, PCVD, PMCVD], i.e. by thin layer coating on the inside or outside of a glass tube or on a glass rod
    • C03B37/01807—Reactant delivery systems, e.g. reactant deposition burners
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/012—Manufacture of preforms for drawing fibres or filaments
    • C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
    • C03B37/018—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD] by glass deposition on a glass substrate, e.g. by inside-, modified-, plasma-, or plasma modified- chemical vapour deposition [ICVD, MCVD, PCVD, PMCVD], i.e. by thin layer coating on the inside or outside of a glass tube or on a glass rod
    • C03B37/01807—Reactant delivery systems, e.g. reactant deposition burners
    • C03B37/01815—Reactant deposition burners or deposition heating means
    • C03B37/01823—Plasma deposition burners or heating means
    • C03B37/0183—Plasma deposition burners or heating means for plasma within a tube substrate
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2201/00—Type of glass produced
    • C03B2201/06—Doped silica-based glasses
    • C03B2201/30—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi
    • C03B2201/31—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi doped with germanium
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2203/00—Fibre product details, e.g. structure, shape
    • C03B2203/10—Internal structure or shape details
    • C03B2203/22—Radial profile of refractive index, composition or softening point
    • C03B2203/23—Double or multiple optical cladding profiles
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2207/00—Glass deposition burners
    • C03B2207/80—Feeding the burner or the burner-heated deposition site
    • C03B2207/85—Feeding the burner or the burner-heated deposition site with vapour generated from liquid glass precursors, e.g. directly by heating the liquid
    • C03B2207/86—Feeding the burner or the burner-heated deposition site with vapour generated from liquid glass precursors, e.g. directly by heating the liquid by bubbling a gas through the liquid

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)

Abstract

The present invention relates to a single mode optical fiber and a preparation method thereof. The single mode optical fiber is not sensitive to bend. A waveguide structure is provided with a core layer and a cladding, wherein the cladding is also divided into five claddings; the core layer and each cladding layer have different refractivity indexes. The preparation method of the optical fiber uses a PCVD process. Raw materials are burnt according to different proportion under the environment of without oxygen and freon so as to obtain the optical fiber which is not sensitive to bend. Compared with a conventional G. 652 optical fiber, the bending loss of the optical fiber is less than 0.005dB between 1310 um and 1550 um, the cut-off wavelength of the optical fiber is less than or equal to 1290 nm, the cut-off wavelength of an optical cable is less than or equal to 1260 nm, the mode field diameter optical fiber is 7+/-0.8 um, the zero-color dispersion wavelength is near to 1310 nm, and the color dispersion slope is not more than 0.065ps/nm 2*km. The color dispersion at 1550 nm is less than or equal to 12ps/nm*km. The attenuation of the optical fiber at 1310 nm is less than or equal to 0.36dB/km, and the attenuation at 1550 nm is less than or equal to 0.24dB/km. The optical fiber is mainly applied to integrated miniaturization optical devices and small bending radius optical fiber communication by curling or weaving.

Description

Bend-insensitive optical fiber and preparation method thereof
Technical field
The present invention relates to fibre-optic waveguide structure Design and optical fiber manufacturing, particularly a kind of single-mode fiber to bend-insensitive and preparation method thereof.
Technical background
The rise of integration of compact optical device and optic fibre manufacturing technology in recent years requires optical fiber added losses under small-bend radius smaller.Therefore, big mode field diameter, little bending loss, low decay and high-intensity bend insensitive optical fiber can be good at adapting to this demand.
The design of preform waveguiding structure is that optical fiber is made most crucial technology, be the key point of decision optical fiber property, so fiber manufacturers is all paid much attention to the fibre-optic waveguide structure Design.Conventional G.652 optical fiber has satisfied the requirement of common carrier in high capacity, telecommunication, its zero-dispersion wavelength is 1300-1324nm, is 18ps/nm*km at the maximum dispersion values of 1550nm.But, in device manufacturing method face and particular application, requirement optical fiber limit bending radius is arranged less than 30 millimeters, small-bend radius can cause long wavelength's additional attenuation of optical fiber significantly to increase, for example, G.652 optical fiber is when bending radius is 10 millimeters, significantly increases from the added losses of the long wavelength more than the 1400nm.Producer's index of G.652 general bending loss is: 100 circles, 60 millimeters of diameters cause the optical fiber additional attenuation at the 1310nm wavelength for being not more than 0.05dB, at the 1550nm wavelength for being not more than 0.1dB; Or one the circle, 32 millimeters additional attenuations that cause of diameter at the 1550nm wavelength for being not more than 0.5dB.
G.653 optical fiber is a kind of dispersion shifted single mode fiber, its zero-dispersion wavelength is between 1500-1600nm, maximum dispersion values at 1525nm-1575nm is-3.5/3.5ps/nm*km, the bending property of this optical fiber can be described below: 100 circles, 60 millimeters of diameters cause the optical fiber additional attenuation at the 1550nm wavelength for being not more than 0.5dB.
G.655 optical fiber is non-zero dispersion displacement single mode optical fibre, and its zero-dispersion wavelength is 0.1-10ps/nm*km at the dispersion values of 1530nm-1565nm outside C-band.The bending property of this optical fiber can be described below: 100 circles, 60 millimeters of diameters cause that the optical fiber additional attenuation is at 1550nm and 1625nm wavelength and are not more than 0.5dB.Producer's index is: a circle, 32 millimeters additional attenuations that cause of diameter are at 1550nm and 1625nm wavelength and are not more than 0.5dB.
U.S. Pat 4,838,643 described a kind of W-type guide structure improvement the optical fiber of fibre-optical bending performance, the elementary structure parameter of this optical fiber is:
Optical fiber divides three-decker, ground floor is a fiber core layer, the refractive index contrast Δ is (with respect to the 3rd layer) in the 0.75-0.95% scope, the second layer is recessed covering, the refractive index contrast Δ is at-0.04--0.06% (with respect to the 3rd layer), the 3rd layer is the surrounding layer of optical fiber, and refractive index contrast is zero.This patent Shen claims recessed layer radius/sandwich layer radius more than 6.5-8.0.Simultaneously, the cutoff wavelength of optical fiber is when 1130nm-1330nm, and mode field diameter is 5-7 μ m, and cutoff wavelength fibre-optic mode field diameter when 1200nm-1280nm is 6-6.5 μ m.
Chinese patent 1124994C has described the new optical fiber inner sandwich layer distribution that applicant Corning Incorporated proposes, and has improved the bending property of optical fiber.This patent has been described a kind of waveguide of two loop configuration, is divided into four layers, and wherein: ground floor is a sandwich layer, and the refractive index contrast Δ is 0.79-1.2%, radius 2.55-3.55 micron; The second layer is that refractive index is higher than covering still less than the moat district of the 3rd floor, and Δ is not more than 0.2%; The 3rd layer refractive index contrast Δ is 0.3-1.2%, radius 5.50-8.70 micron, and the 3rd layer of width is the 0.4-2 micron.Zero-dispersion wavelength in the 1575-1595nm scope, in the chromatic dispersion of 1525-1565nm scope between-0.75--5.5ps/nm*km, at the chromatic dispersion gradient of 1570-1595nm scope less than 0.1ps/nm 2* km, mode field diameter is not less than 7.9 microns.Healthy and free from worryly declare this optical fiber than US 5,483,612 optical fiber of describing have improved low decay in the expansion wavelength window, low total dispersion in the expansion wavelength window, polarization mode dispersion PMD and the outstanding long-term counter-bending fade performance that brings out under rugged surroundings.
Above-described optical fiber does not relate to application and the dependence test analysis under the small-bend radius condition, today compact device and special occasions all require optical fiber can adapt to the application scenario of little bending condition, optical fiber above-mentioned does not have clear and definite performance index can guarantee its Secure Application.
Plasma chemical vapor deposition method PCVD technology is method technology in a kind of pipe, and advantage is to design and to realize very complicated precast rod refractivity section, and still, PCVD technology is the low decay of difficulty realization optical fiber, especially reduces the water peak of optical fiber.A kind of valid approach is to improve purity of raw materials, but this method can increase substantially cost and need increase equipment.The present invention proposes a kind of PCVD method that can reduce and makes the technology that the water peak is hanged down at the 1383nm place, becomes the real technology of burning in the rod motion exactly, is to burn reality under the environment that does not have oxygen and freon.
According to bibliographical information, OH in the optical fiber -Content and optical fiber are that certain relation is arranged at the water peak of 1383nm.OH -Content is when 1ppm, and corresponding optical fiber is 60dB/km in the decay of 1383nm, and now low-water-peak fiber in the decay at 1383nm place less than 0.3dB/km, so, reduce the water peak of 1383nm, OH that must reduction preform inside -Content.
In PCVD technology, in case deposition process is finished the OH in the preform -Content has just been determined, can not reduce OH by aftertreatment as OVD or VAD technology -Content.But becoming in the rod motion, PCVD technology also may introduce water, so, be reduced to the pollution of introducing in the rod motion as far as possible, can reduce the water peak of optical fiber at 1383nm.
Summary of the invention
Purpose of the present invention is in order to overcome the defective that above-mentioned prior art exists, a kind of optical fiber and preparation method thereof is provided, this zero-dispersion wavelength of fiber is not more than 12ps/nm*km at wavelength 1550nm dispersion values near 1310nm, be not more than 0.065ps/nm at wavelength 1550nm chromatic dispersion gradient 2* km; Cable cut-off wavelength is not more than 1260nm, and the index of this optical fiber is equal to G.652 index of routine; The mode field diameter of this optical fiber is 7 ± 0.8 microns, and the bending property of this optical fiber can be described below: 5 circles, 20 millimeters of diameters cause the optical fiber additional attenuation at the 1310nm wavelength for being not more than 0.005dB, at the 1550nm wavelength for being not more than 0.005dB.The optical fiber of the inventive method preparation can reduce OH -Water peak at the 1383nm place.
A kind of bend insensitive optical fiber, its waveguiding structure has sandwich layer and covering, and wherein covering is divided into five coverings again, and the refractive index contrast of sandwich layer and each covering is all with respect to the 5th covering, the sandwich layer refractive index contrast: O.6%≤Δ 1≤ O.8%, 2.5 microns≤r of sandwich layer radius 1≤ 2.9 microns; The first covering refractive index contrast :-0.5%≤Δ Clad13.0 microns≤r of≤-0.4%, first cladding radius Clad1≤ 3.5 microns; The second covering refractive index contrast :-0.4%≤Δ Clad23.5 microns≤r of≤-0.35%, second cladding radius Clad2≤ 4.3 microns; Triple clad refractive index contrast: 0%≤Δ Clad3≤ 0.1%, 7 microns≤r of triple clad radius Clad3≤ 8 microns; The 4th covering refractive index contrast :-0.1%≤Δ Clad440 microns≤r of the≤0%, the 4th cladding radius Clad4≤ 42 microns, the 5th covering is a pure silicon dioxide, and its refractive index is the silica glass refractive index.
The preparation method of bend insensitive optical fiber, the preparation method of this optical fiber adopts plasma chemical vapor deposition method PCVD technology to make preform, preparation process was divided into for two steps, it at first is deposition, be to become rod then, (1) in the process of deposition, by the deposition process of polishing, transition, the 4th covering, triple clad, second covering, first covering and sandwich layer, control starting material SiCl 4, GeCl 4, freon, oxygen flow, obtain depositing the preform of finishing; (2) preform that deposition is finished is lifted to into to melt on the excellent equipment and is contracted, in becoming rod motion, aerating oxygen and freon corrode, burn reality from the outlet side, in burning real process, the prefabricated rods inside surface is to burn reality under the environment that does not have oxygen and freon, makes bend insensitive optical fiber preform.
By our discovering, in becoming rod motion, aerating oxygen and freon corrode, and burn real the time from inlet end then, and the oxygen of tail end and freon can be from the outlet side adverse current to inlet ends, thereby pollute the optical fiber inside surface that has just etched.The present invention proposes to burn reality from the outlet side, and in burning real process, the prefabricated rods inside surface is to burn reality under the environment that does not have oxygen and freon, has guaranteed the clean of optical fiber inside surface, has reduced OH -Content has reduced the decay of optical fiber at the 1383nm place.
The present invention adopts PCVD technology to make preform, and PCVD technology is compared with OVD or VAD technology, has a lot of advantages, for example is easy to make recessed covering and makes complicated refractive index profile structure.
Key of the present invention is that process has summed up the data of waveguiding structure to the optical fiber property influence by experiment, then, calculates the sectional parameter of optical fiber by experimental formula.Computer technology has played vital role in this process.
Light wave transmits in optical fiber and satisfies weak guided wave condition, the photoelectricity magnetic wave exists axial leading electromagnetic field and evanescent field radially simultaneously in the transmission course in optical fiber, the light wave electromagnetic field has nothing in common with each other in the distribution of different waveguiding structure midfields, and different field distribution will be carried different luminous powers.
In bend insensitive optical fiber,, therefore, must guarantee the single mode transport of optical fiber more than the 1310nm wavelength owing to use two communication windows of 1310nm and 1550nm simultaneously.
By formula:
λc = 2 π an 1 2 Δ V c - - - ( 1 )
Can know: designing requirement λ c＜1260nm, 6 ± 0.5 microns of mode field diameters, V cBe constant, n 1Can be considered constant, so, but the design parameter core diameter 2a of optical fiber and fibre core relative index of refraction Δ all are restricted.
As everyone knows, the waveguiding structure of optical fiber is very big to the influence of optical fiber property, and is all associated as decay, chromatic dispersion, cutoff wavelength, mode field diameter, bending loss or the like.So the present invention has found a kind of suitable fibre-optic waveguide, can optimize these optical fiber property indexs simultaneously.
The microbending loss of single-mode fiber can be calculated by following formula:
α = A 8 ( k 0 n 1 s 0 2 ) [ k 0 n 1 s 2 ( p ) 2 ] 2 p - - - ( 2 )
A=9.6799*10 in the formula -19(dB/km); P=3.2; s 0Be mould spot radius.
Can analyze and draw, the relation of the mould spot radius of the microbending loss of optical fiber and optical fiber is very tight, and mould spot radius is more little, and then microbending loss is also more little.An other influence factor of microbending loss is a refractive index contrast Δ value, is worth greatly more, and microbending loss is also big more, needs suitable refractive index contrast Δ value.
The bending loss of single-mode fiber can be provided by following formula:
α c = A c R - 1 2 exp ( - UR ) - - - ( 3 )
A c = 1 2 ( π a W 3 ) 1 2 [ U WK 1 ( W ) ] 2 - - - ( 4 )
U = 4 δn W 3 3 a V 2 n 2 - - - ( 5 )
Wherein R is a bending radius, and U and W are radially normalization phase constant and radially normalization attenuation constant.
U in the formula, V, W are and the parameter of fibre-optic waveguide structurally associated, therefore, by the design of waveguiding structure, can reduce the bending loss of optical fiber.
Optical fiber described in the invention comprises a sandwich layer and a plurality of covering, the refractive index contrast Δ n of fiber core layer 2Be 0.6%-0.8%, analyze, improved n according to formula (4) and (5) 2, reduced U and A cValue.Such design can help the optimization of bending loss of optical fiber.
Improve the refractive index contrast Δ n of sandwich layer 2, negative effect is the cutoff wavelength that has reduced the mode field diameter of optical fiber and increased optical fiber.
s = a V - - - ( 6 )
S is called mode spot-size, and it represents the intensity of luminous energy at fibre core.Mode field diameter MFD be with corresponding test on term, weigh the intensity of the luminous energy of optical fiber with MFD usually at fibre core, so the s of single-mode fiber is big, then MFD is also big.
The introducing of triple clad has changed the U value, remote effect the V value, therefore, the introducing of triple clad can change fibre-optic mode field diameter.Common experience is: the refractive index contrast Δ of triple clad Clad3Increase the radius r of triple clad Clad3Increase, then the mode field diameter of optical fiber is big more.But, with the introducing of triple clad, may increase the pattern in the fibre-optic waveguide, particularly newly-increased high-order mode, as LP (2.1), LP (2.2), LP (3.1) isotype.The effect of triple clad is improving CHROMATIC DISPERSION IN FIBER OPTICS equally except that increasing the mould field.But, might be at (Δ Clad3, r Clad3) certain scope in can cause fiber cut off wavelength elongated.
The 4th covering refractive index contrast Δ Clad4, the radius r of the 4th covering Clad4Design can reduce the cutoff wavelength of optical fiber, therefore, can make the cutoff wavelength of optical fiber less than satisfying other optical fiber designs index under the prerequisite of 1290nm simultaneously by appropriate design.
This optical fiber is with respect to routine G.652 for the optical fiber, the bending loss of this optical fiber at 1310nm wavelength and 1550nm wavelength less than 0.005dB, the cutoff wavelength≤1290nm of optical fiber, cable cut-off wavelength≤1260nm; Fibre-optic mode field diameter is 7 ± 0.8 μ m; Zero-dispersion wavelength is near 1310nm, and chromatic dispersion gradient is not more than 0.065ps/nm2*km; Chromatic dispersion≤12ps/nm*km at the 1550nm place.Optical fiber is at decay≤0.36dB/km of 1310nm, at decay≤0.24dB/km of 1550nm.
Description of drawings
Fig. 1 is a fibre-optic waveguide structural representation of the present invention.
Fig. 2 is an optical fiber preparation process flow diagram of the present invention.
Embodiment
Press raw material proportioning and the technological parameter shown in the table 1, under computer program control, adopt PCVD technology to make optical fiber of the present invention, its waveguiding structure of the optical fiber of preparing, as shown in Figure 1.Ready reaction substrate tube is installed on the depositing device, the preheating furnace temperature is elevated to 1150 ℃, weave computer program; Open microwave generator, beginning begins deposition according to the program of prescription customization, and the deposition through polishing, transition, the 4th covering, triple clad, second covering, first covering and sandwich layer stops microwave and computer program then.The preform that deposition is finished is lifted to into to melt on the excellent equipment and is contracted, in becoming rod motion, aerating oxygen and freon corrode, burn reality from the outlet side, in burning real process, the prefabricated rods inside surface is to burn reality under the environment that does not have oxygen and freon, has guaranteed the clean of optical fiber inside surface, has reduced OH -Content has reduced the decay of optical fiber at the 1383nm place.The preform of this waveguiding structure forms the fibre-optic waveguide structure by tiretube process, passes through wire drawing, after-combustion, test, packing then, obtains bend-insensitive optical fiber at last.The specific targets of this optical fiber are: zero-dispersion wavelength is not more than 12ps/nm*km at the 1550nm dispersion values near 1310nm, be not more than 0.065ps/nm at the 1550nm chromatic dispersion gradient 2* km; Cable cut-off wavelength is not more than 1260nm, and the index of this optical fiber is equal to G.652 index of routine; The mode field diameter of this optical fiber is 7 ± 0.8 microns, and the bending property of this optical fiber can be described below: 5 circles, 20 millimeters of diameters cause the optical fiber additional attenuation at the 1310nm wavelength for being not more than 0.005dB, at the 1550nm wavelength for being not more than 0.005dB.
Table 1, raw material proportioning and technological parameter
Embodiment Polishing Transition The 4th covering Triple clad Second covering First covering Sandwich layer
Reaction oxygen (sccm) 2600 2450 2600 1200 1200 1200 1200
Feed the gas (sccm) of silicon tetrachloride head tank 0 0 1200 1200 1200 1200 1200
Feed the gas (sccm) of germanium tetrachloride head tank 0 0 1200 1200 1200 1200 1200
Silicon tetrachloride (steam-like) quality (g/min) 0 0 4.1 4.4 3.7 3.7 3.7
Germanium tetrachloride (steam-like) quality (g/min) 0 0 0.06 0.06 0.03 0.03 0.13 4
Fluorine Lyons (sccm) 24 0.5 10 6 12 13 3
Silicon tetrachloride head tank temperature (K) 310 310 310 310 310 310 310
Germanium tetrachloride head tank temperature (K) 310 310 310 310 310 310 310
Gas mixing zone temperature (K) 315 315 315 315 315 315 315
Gas mixing zone pressure (Torr) 890 890 890 890 890 890 890
The sccm-standard cubic centimeters per minute

Claims (6)

1, a kind of bend insensitive optical fiber, its waveguiding structure has sandwich layer and covering, wherein covering is divided into five coverings again, the refractive index contrast of sandwich layer and each covering is all with respect to the 5th covering, it is characterized in that: the sandwich layer refractive index contrast: 0.6%≤Δ 1≤0.8%, 2.5 microns≤r1 of sandwich layer radius≤2.9 microns; The first covering refractive index contrast :-0.5%≤Δ clad1≤-0.4%, 3.0 microns≤rclad1 of first cladding radius≤3.5 microns; The second covering refractive index contrast :-0.4%≤Δ clad2≤-0.35%, 3.5 microns≤rclad2 of second cladding radius≤4.3 microns; Triple clad refractive index contrast: 0%≤Δ clad3≤7 microns≤rclad3 of 0.1%, the triple clad radius≤8 microns; The 4th covering refractive index contrast :-0.1%≤Δ clad4≤40 microns≤rclad4 of 0%, the four cladding radius≤42 microns, the 5th covering is a pure silicon dioxide, its refractive index is the silica glass refractive index.
2, according to the described bend insensitive optical fiber of claim 1, it is characterized in that: the design of first covering, second covering has improved the bending resistance of optical fiber, and the mode field diameter of optical fiber is 6.2 microns-7.8 microns simultaneously.
3, according to the described bend insensitive optical fiber of claim 1, it is characterized in that: triple clad design has enlarged the mode field diameter of optical fiber and has reduced the CHROMATIC DISPERSION IN FIBER OPTICS slope.
4, according to the described bend insensitive optical fiber of claim 1, it is characterized in that: the design of the 4th covering, reduced the cutoff wavelength of optical fiber.
5, according to the described bend insensitive optical fiber of claim 1, it is characterized in that: be applied to the occasion of small-bend radius, at 1310nm and 1550nm window, additional attenuation is not more than 0.005dB.
6, the preparation method of bend insensitive optical fiber, the preparation method of this optical fiber adopts plasma chemical vapor deposition method PCVD technology to make preform, preparation process was divided into for two steps, it at first is deposition, be to become rod then, it is characterized in that: (1) by the deposition process of polishing, transition, the 4th covering, triple clad, second covering, first covering and sandwich layer, controls starting material SiCl in the process of deposition 4, GeCl 4, freon, oxygen flow, obtain depositing the preform of finishing; (2) preform that deposition is finished is lifted to into to melt on the excellent equipment and is contracted, in becoming rod motion, aerating oxygen and freon corrode, burn reality from the outlet side, in burning real process, the prefabricated rods inside surface is to burn reality under the environment that does not have oxygen and freon, makes bend insensitive optical fiber preform.
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CN105137535B (en) * 2015-09-18 2018-10-09 长飞光纤光缆股份有限公司 A kind of single mode optical fiber and its manufacturing method
CN107085263B (en) * 2017-05-16 2019-10-01 长飞光纤光缆股份有限公司 A kind of fused tapered bend-insensitive single-mode optical fiber
CN110221383B (en) * 2019-07-12 2023-07-07 杭州金星通光纤科技有限公司 Single-mode optical fiber and manufacturing method thereof
CN114057388B (en) * 2020-08-05 2023-08-08 中天科技精密材料有限公司 Optical fiber preform manufacturing method, optical fiber preform, and optical fiber
CN114325928B (en) * 2021-12-31 2023-03-14 长飞光纤光缆股份有限公司 Low-loss bending-resistant single-mode optical fiber

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