CN113625390B - Dispersion optimization bending insensitive optical fiber - Google Patents

Dispersion optimization bending insensitive optical fiber Download PDF

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CN113625390B
CN113625390B CN202111195958.7A CN202111195958A CN113625390B CN 113625390 B CN113625390 B CN 113625390B CN 202111195958 A CN202111195958 A CN 202111195958A CN 113625390 B CN113625390 B CN 113625390B
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refractive index
cladding
depressed
optical fiber
depressed cladding
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CN113625390A (en
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雷汉林
王瑞春
顾立新
朱继红
刘善沛
黄利伟
曹蓓蓓
吴俊�
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Yangtze Optical Fibre and Cable Co Ltd
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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
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
    • G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
    • G02B6/03638—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 3 layers only
    • G02B6/03644—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 3 layers only arranged - + -
    • 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
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
    • G02B6/03694—Multiple layers differing in properties other than the refractive index, e.g. attenuation, diffusion, stress properties

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Abstract

The invention discloses a dispersion optimized bend insensitive fiber, which is provided with a transitional depressed cladding between a core layer and a depressed cladding, wherein the relative refractive index difference of the transitional depressed cladding is continuously changed from 0 percent from inside to outside to the relative refractive index difference of a junction point of the depressed cladding. The invention adopts double sunken claddings to carry out balanced optimization on waveguide dispersion and macrobending performance, and the dispersion coefficient is reduced on the premise of ensuring that the bending performance of the optical fiber is not influenced; the refractive index of the transitional depressed cladding layer between the core layer and the depressed cladding layer is continuously changed, so that the waveguide dispersion caused by the refractive index difference between the core layer and the cladding layer in the waveguide structure is reduced, the refractive index distribution and the width of the transitional depressed cladding layer are limited, the dispersion coefficient is optimized, and the problem of overlarge bending loss under a small bending radius caused by a raised cladding layer is solved.

Description

Dispersion optimization bending insensitive optical fiber
Technical Field
The invention belongs to the field of optical fiber communication, and particularly relates to a dispersion optimized bend insensitive optical fiber.
Background
Dispersion is an important transmission characteristic of optical fibers. Dispersion is a physical effect that produces different time delays due to different frequencies or mode components of the light wave traveling at different speeds. With the continuous increase of the transmission distance of the optical fiber, the broadening of the optical pulse caused by the dispersion causes the mutual overlapping of the front pulse and the rear pulse, which causes the intersymbol interference of the digital signal and increases the error rate. The dispersion mainly existing in the single-mode fiber is material dispersion and waveguide dispersion, and the material dispersion is a dispersion characteristic caused by signal pulse broadening caused by the change of the group refractive index of the material along with the wavelength. Waveguide dispersion is dispersion caused by different group velocities due to different phase constants and different group velocities of one guided wave mode in an optical fiber at different frequencies. The dispersion of the optical fiber not only affects the transmission capacity of the optical fiber, but also limits the product value of the bandwidth and the distance of the optical fiber, and also limits the relay distance of the optical fiber communication system. The larger the dispersion, the smaller the product of bandwidth and distance in the fiber, and at a certain transmission distance, the smaller the bandwidth, and the size of the bandwidth determines the size of the transmission information capacity.
The G657 optical fiber is widely applied to high-density wiring networks due to the excellent bending insensitivity of the G657 optical fiber, and the improvement of the dispersion performance of the G657A2 bending insensitivity single-mode optical fiber has important significance for meeting the requirements of high-speed, large-capacity and long-distance transmission of an optical fiber communication system.
The bend-insensitive optical fiber generally has a depressed cladding, and the bend-insensitive single-mode optical fiber patent documents CN110780379B, CN110749953A, CN103257397B and CN102200610B which optimize the dispersion performance of the bend-insensitive optical fiber adopt the depressed cladding and also arrange a convex cladding, but from example data, the design of the convex cladding of the dispersion-optimized single-mode optical fiber is difficult to meet the bending loss requirements of g.657.a2 and g.657.b3 under a small bending radius.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides a dispersion optimized bend insensitive optical fiber, which aims to optimize the dispersion performance of the optical fiber while meeting the bend insensitive performance requirement of a single mode fiber through a transitional sunken cladding with gradually changed refractive index, thereby solving the technical problem that the existing dispersion optimized single mode fiber has a convex cladding and is difficult to meet the bend loss performance requirement under the condition of small bend radius change.
To achieve the above objects, according to one aspect of the present invention, there is provided a dispersion optimized bend insensitive optical fiber comprising a core layer and a depressed cladding layer, between which a transitional depressed cladding layer is disposed, the relative refractive index difference of which continuously varies from 0% from inside to outside to the relative refractive index difference of the boundary point of the depressed cladding layer.
Preferably, the dispersion-optimized bend-insensitive optical fiber has a depressed-transition cladding with a profile of relative refractive index difference
Figure 207561DEST_PATH_IMAGE001
A sub-parabolic profile.
Preferably, the dispersion-optimized bend-insensitive optical fiber has a relative refractive index difference change curve of the transition depressed cladding expressed as:
Figure 841805DEST_PATH_IMAGE002
wherein
Figure 939074DEST_PATH_IMAGE003
For the transition of a certain point in the sunken cladding to the boundary distance of the cladding,
Figure 771901DEST_PATH_IMAGE004
is the relative refractive index difference at that point,
Figure 929213DEST_PATH_IMAGE001
preferably between 0.25 and 5, more preferably between 2 and 4.25,
Figure 50752DEST_PATH_IMAGE005
the refractive index of the core layer is relative to pure silica i.e. its relative refractive index difference,
Figure 951712DEST_PATH_IMAGE006
to lower the refractive index of the cladding relative to pure silica,
Figure 639046DEST_PATH_IMAGE007
the cladding width is depressed for transition.
Preferably, the dispersion optimized bend insensitive fiber has a depressed transition cladding width
Figure 170521DEST_PATH_IMAGE007
Radius of core layer
Figure 576095DEST_PATH_IMAGE003
1Ratio of (A to B)
Figure 280746DEST_PATH_IMAGE008
The value is between 1.2 and 2.0.
Preferably, the dispersion optimized bend insensitive optical fiber has a fluorine doped volume of its depressed cladding
Figure 25848DEST_PATH_IMAGE009
And transition depressed cladding fluorine-doped volume
Figure 524962DEST_PATH_IMAGE010
Ratio of (A to B)
Figure 417832DEST_PATH_IMAGE011
The value is between 5 and 20; said transitional depressed cladding doped with fluorine volume
Figure 598277DEST_PATH_IMAGE010
And fluorine-doped volume of depressed cladding
Figure 260203DEST_PATH_IMAGE009
The calculation method of (c) is as follows:
Figure 195798DEST_PATH_IMAGE012
Figure 513647DEST_PATH_IMAGE013
Figure 294521DEST_PATH_IMAGE010
in order to transition the depressed cladding layer into a fluorine-doped volume,
Figure 76532DEST_PATH_IMAGE009
in order to lower the fluorine-doped volume of the cladding,
Figure 917449DEST_PATH_IMAGE007
the width of the cladding layer which is in transition depression,
Figure 722594DEST_PATH_IMAGE014
is the depressed cladding width.
Preferably, the dispersion optimized bend insensitive fiber has a depressed transition cladding width
Figure 572738DEST_PATH_IMAGE007
And depressed cladding width
Figure 943677DEST_PATH_IMAGE014
The following conditions are satisfied:
Figure 158758DEST_PATH_IMAGE015
the value is between 1.3 and 1.9.
Preferably, the dispersion optimized bend insensitive fiber has a depressed transition cladding width
Figure 247936DEST_PATH_IMAGE007
4.5 to 8.0 μm.
Preferably, the dispersion optimized bend insensitive fiber has a depressed cladding maximum relative refractive index
Figure 642052DEST_PATH_IMAGE006
The refractive index depression is preferably linear, arc or semicircular, and ranges from-0.55% to-0.20%.
Preferably, the dispersion optimized bend insensitive optical fiber has a core radius
Figure 70759DEST_PATH_IMAGE003
13.0 to 4.0 μm, and the relative refractive index difference thereof
Figure 519058DEST_PATH_IMAGE005
0.30% -0.40%.
Preferably, the optical fiber glass part of the dispersion-optimized bend-insensitive optical fiber sequentially comprises a core layer, a transitional depressed cladding layer and a depressed cladding layer from inside to outside, and the rest is a pure silica glass layer.
Preferably, the dispersion optimized bend insensitive fiber meets the G657a2 standard; the core layer of radius
Figure 95533DEST_PATH_IMAGE003
13.0 to 4.0 μm, and the relative refractive index difference thereof
Figure 225163DEST_PATH_IMAGE005
0.30% -0.40%; said depressed transition cladding having a width
Figure 570693DEST_PATH_IMAGE007
4.5 to 8.0 μm, and the relative refractive index difference thereof
Figure 189894DEST_PATH_IMAGE016
Satisfy the requirement of
Figure 191348DEST_PATH_IMAGE001
Parabolic distribution, distribution index
Figure 921406DEST_PATH_IMAGE001
Between 2 and 4; said depressed cladding layer having a width
Figure 121443DEST_PATH_IMAGE014
5.0 to 9.0 μm, and the relative refractive index difference thereof
Figure 114807DEST_PATH_IMAGE006
Is-0.35 to-0.20 percent; or
Meets the G657B3 standard, the core layer, the radius of the core layer
Figure 400295DEST_PATH_IMAGE003
13.2 to 3.8 μm, and the relative refractive index difference
Figure 934045DEST_PATH_IMAGE005
0.35% -0.40%; said depressed transition cladding having a width
Figure 191851DEST_PATH_IMAGE007
4.5 to 7.0 μm, and the relative refractive index difference thereof
Figure 152853DEST_PATH_IMAGE016
Satisfy the requirement of
Figure 925637DEST_PATH_IMAGE001
Parabolic distribution, distribution index
Figure 200761DEST_PATH_IMAGE001
Between 2 and 5; said depressed cladding layer having a width
Figure 109811DEST_PATH_IMAGE014
5.0 to 8.0 μm, and the relative refractive index difference thereof
Figure 507294DEST_PATH_IMAGE006
The content is-0.55 to-0.40 percent.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
the invention adopts double sunken claddings to carry out balanced optimization on waveguide dispersion and macrobending performance, and the dispersion coefficient is reduced on the premise of ensuring that the bending performance of the optical fiber is not influenced; the refractive index of the transitional depressed cladding between the core layer and the depressed cladding is continuously changed, and the transitional depressed cladding with the refractive index complying with alpha-order distribution is preferably adopted to reduce waveguide dispersion caused by the refractive index difference between the core layer and the cladding in the waveguide structure, limit the refractive index distribution and the width of the transitional depressed cladding, optimize the dispersion coefficient and avoid the problem of overlarge bending loss under small bending radius caused by a raised cladding.
In the preferable scheme, the sunken cladding layer is adopted, and the fluorine-doped volume ratio of the transitional sunken cladding layer and the final sunken cladding layer is optimized to realize friendly combination of low dispersion coefficient and excellent bending property, so that the bending loss requirements of G.657.A2 and G.657.B3 under a small bending radius are met. The optical fiber of the preferred scheme of the invention conforms to the standards of G.657.A2 and G.657.B3, simultaneously keeps good macrobend loss and lower dispersion coefficient, has simple preparation process, is suitable for large-scale production, and can meet the requirements of high-speed, large-capacity and long-distance transmission of an optical fiber communication system.
Drawings
FIG. 1 is a schematic cross-sectional view of a dispersion-optimized bend insensitive optical fiber with a linearly depressed cladding according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a dispersion optimized bend insensitive optical fiber with an arcuately depressed cladding according to an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of a dispersion optimized bend insensitive optical fiber with a semi-circular depressed cladding according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following 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 following are definitions and descriptions of some terms involved in the present invention:
the OVD process comprises the following steps: the quartz glass with the required thickness and the required refractive index profile is prepared by an external vapor deposition and sintering process.
The PCVD process comprises the following steps: and preparing the quartz glass with the required thickness and the required refractive index profile by using a plasma chemical vapor deposition process.
VAD process: the quartz glass with the required thickness and the required refractive index profile is prepared by axial vapor deposition and sintering processes.
And (3) a melting and shrinking process: and carrying out high-temperature fusion shrinkage by using a doped quartz glass rod and a doped quartz liner tube to obtain quartz glass with the required thickness and the required refractive index profile.
Performing: the optical fiber is a material prefabricated member which is distributed by a core layer and a cladding layer and can be drawn according to the design requirement of the optical fiber.
The relative refractive index Δ ni of each layer of the optical fiber is defined by the following equation, Δ ni =
Figure 705057DEST_PATH_IMAGE017
Where ni is the refractive index of the glass at each location of the fiber and nc is the refractive index of the outer cladding, i.e., the refractive index of pure silica.
The optical fiber glass part sequentially comprises a core layer, a transitional sunken cladding layer and a sunken cladding layer from inside to outside, and the rest is a pure silica glass layer; the transition depressed cladding is arranged between the core layer and the depressed cladding, and the relative refractive index difference of the transition depressed cladding continuously changes from 0% from inside to outside, preferably continuously and monotonically changes to the relative refractive index difference of a boundary point of the depressed cladding.
The radius r1 of the core layer is 3.0-4.0 mu m, the relative refractive index difference delta n1 is 0.32-0.39%, the core layer is a Ge-doped silica glass layer, and the contribution delta n1 of the relative refractive index of germanium in the core layer is 0.32-0.39%.
The relative refractive index difference change curve of the transitional depressed cladding is
Figure 580610DEST_PATH_IMAGE001
A sub-parabolic distribution; preferably can be expressed as:
Figure 875325DEST_PATH_IMAGE018
wherein
Figure 115813DEST_PATH_IMAGE003
For the transition of a certain point in the sunken cladding to the boundary distance of the cladding,
Figure 128769DEST_PATH_IMAGE001
a distribution index of between 0.25 and 5, preferably between 1.0 and 4.5, more preferably between 2 and 4.25,
Figure 542432DEST_PATH_IMAGE005
relatively pure silica as core layerI.e. its relative refractive index difference,
Figure 629337DEST_PATH_IMAGE006
for the refractive index of the final depressed cladding relative to pure silica i.e. its relative refractive index difference,
Figure 103044DEST_PATH_IMAGE007
the cladding width is depressed for transition. Maximum relative refractive index difference of transition depressed cladding
Figure 72137DEST_PATH_IMAGE006
The cladding width is-0.15% -0.04%, and the transitional sinking cladding width
Figure 492754DEST_PATH_IMAGE007
4.5 to 8.0 μm.
Maximum relative refractive index difference of the depressed cladding
Figure 496482DEST_PATH_IMAGE006
The refractive index of the region is kept to be continuously changed to form a recess, and the recess can be linear, arc or semicircular. Width of sunken cladding
Figure 141090DEST_PATH_IMAGE014
5.0 to 10.0 μm.
Said transition depressed cladding width
Figure 800741DEST_PATH_IMAGE007
Radius of core layer
Figure 821787DEST_PATH_IMAGE019
Ratio of (A to B)
Figure 680021DEST_PATH_IMAGE008
The value is between 1.2 and 2.0. Said transition depressed cladding width
Figure 698793DEST_PATH_IMAGE007
And depressed cladding width
Figure 642478DEST_PATH_IMAGE014
The following conditions are satisfied:
Figure 201636DEST_PATH_IMAGE015
the value is between 1.3 and 1.9.
Fluorine-doped volume of said depressed cladding
Figure 117639DEST_PATH_IMAGE009
And transition depressed cladding fluorine-doped volume
Figure 369629DEST_PATH_IMAGE010
Ratio of (A to B)
Figure 3872DEST_PATH_IMAGE011
The value is between 5 and 20; said transitional depressed cladding doped with fluorine volume
Figure 101141DEST_PATH_IMAGE010
And fluorine-doped volume of depressed cladding
Figure 933968DEST_PATH_IMAGE009
The calculation method of (c) is as follows:
Figure 91280DEST_PATH_IMAGE020
Figure 947241DEST_PATH_IMAGE013
Figure 113780DEST_PATH_IMAGE010
in order to transition the depressed cladding layer into a fluorine-doped volume,
Figure 4375DEST_PATH_IMAGE009
the depressed cladding is doped with fluorine volume.
The single-mode fiber dispersion is the algebraic sum of the material dispersion and the waveguide dispersion of the fiber; the intermodal dispersion of the single-mode optical fiber is zero; material dispersion is only related to the material composition, while waveguide dispersion depends on the core radius, refractive index difference, and shape of the refractive index profile. Fiber dispersion optimizes common raised claddings, however, the presence of raised claddings seriously affects the macrobending performance of the fiber. The invention cancels a convex cladding, adopts the design of a double-sunken cladding of a transitional sunken cladding and a sunken cladding to balance and optimize the waveguide dispersion and macrobending performance, adopts an alpha-time distribution transitional sunken cladding to reduce the waveguide dispersion caused by the refractive index difference between a core layer and the cladding in a waveguide structure, and limits the refractive index distribution and the width of the transitional sunken cladding, so that the dispersion coefficient is obviously improved under the action of the transitional sunken cladding under the condition of the increase of the dispersion coefficient caused by the overlarge refractive index difference between the core layer and the sunken cladding.
The manufacturing method adopted by the optical fiber is that PCVD/VAD + sleeve liner tube fusion shrinkage + OVD technology is used for preparing the needed optical fiber preform, VAD technology or PCVD technology is used for preparing a core rod corresponding to an optical fiber core layer and an F-doped transitional sunken cladding layer, a doped quartz liner tube is used for preparing the corresponding needed F-doped sunken cladding layer, and the core rod and the F-doped liner tube are fused into a solid rod at high temperature to carry out OVD technology outer cladding treatment; the preform prepared by the OVD can be drawn by matching with a coater to obtain the dispersion-optimized bent insensitive single-mode fiber.
The following are examples:
in the examples:
the test method of the cut-off wavelength lambda cc of the optical cable refers to the method specified in IEC 60793-1-44;
the macrobend additional loss test method refers to a method specified in IEC 60793-1-47;
the microbending loss test method refers to the method B in IEC-62221;
examples 1-1 to 10G 657A2 Standard optical fiber
The geometrical dimensions and refractive index parameters of the G657A2 standard fiber are shown in the following table;
Figure 332589DEST_PATH_IMAGE021
Figure 738162DEST_PATH_IMAGE022
the relative refractive index difference profile of the depressed transition cladding can be expressed as:
Figure 380496DEST_PATH_IMAGE023
wherein
Figure 939914DEST_PATH_IMAGE003
For the transition of a certain point in the sunken cladding to the boundary distance of the cladding,
Figure 704608DEST_PATH_IMAGE001
in order to obtain the distribution index,
Figure 535160DEST_PATH_IMAGE024
the refractive index of the core layer is relative to pure silica i.e. its relative refractive index difference,
Figure 777923DEST_PATH_IMAGE025
in order to lower the refractive index of the cladding relative to pure silica i.e. its relative refractive index difference,
Figure 705428DEST_PATH_IMAGE007
the cladding width is depressed for transition.
Through tests, the attenuation of the G657A2 standard optical fiber provided by the embodiments 1-10 at the wavelength of 1310nm is less than or equal to 0.330 dB/km; attenuation at a wavelength of 1383nm is not more than 0.284 dB/km; attenuation at the wavelength of 1550nm is less than or equal to 0.190 dB/km; attenuation at a wavelength of 1625nm is less than or equal to 0.210 dB/km;
the diameter of a mode field at 1310nm is 8.4-9.0 mu m, and the cut-off wavelength of the optical cable is less than or equal to 1260 nm;
the zero dispersion wavelength of the optical fiber is 1300-1324 nm, and the dispersion slope of the optical fiber at the zero dispersion wavelength is equal to or less than 0.087ps/nm2·km；
Its Abbe number at a wavelength of 1550nm is equal to or less than 17 ps/nm/km.
Its Abbe number at a wavelength of 1625nm is equal to or less than 21.2 ps/nm/km.
The macro-bending loss of the 1550nm window at the R15mm-10 circles is less than or equal to 0.03dB, and the macro-bending loss of the 1625nm window is less than or equal to 0.1 dB; the macrobending loss of a 1550nm window at R10mm-1 turn is less than or equal to 0.06 dB, and the macrobending loss of a 1625nm window is less than or equal to 0.1 dB; and the macrobending loss of a 1550nm window at R7.5mm-1 circle is less than or equal to 0.2db, and the macrobending loss of a 1625nm window is less than or equal to 0.5 db.
The microbending loss of the optical fiber at the wavelength of 1700nm is less than or equal to 1 dB/km.
The specific test results are shown in the following table:
Figure 578706DEST_PATH_IMAGE026
Figure 693292DEST_PATH_IMAGE027
examples 2-1 to 10G 657B3 Standard optical fiber
The geometrical dimensions and refractive index parameters of the G657B3 standard fiber are shown in the following table;
Figure 739746DEST_PATH_IMAGE028
Figure 459440DEST_PATH_IMAGE029
the refractive index profile of the depressed transition cladding can be expressed as:
Figure 565936DEST_PATH_IMAGE023
wherein
Figure 902240DEST_PATH_IMAGE003
For the transition of a certain point in the sunken cladding to the boundary distance of the cladding,
Figure 690067DEST_PATH_IMAGE001
in order to obtain the distribution index,
Figure 326585DEST_PATH_IMAGE024
is the refractive index of the core layer relative to pure silica,
Figure 541665DEST_PATH_IMAGE025
to lower the refractive index of the cladding relative to pure silica,
Figure 630844DEST_PATH_IMAGE007
the cladding width is depressed for transition.
Through tests, the attenuation of the G657B3 standard optical fiber provided by the embodiments 2-1-10 at the wavelength of 1310nm is less than or equal to 0.330 dB/km; attenuation at a wavelength of 1383nm is not more than 0.284 dB/km; attenuation at the wavelength of 1550nm is less than or equal to 0.190 dB/km; attenuation at a wavelength of 1625nm is less than or equal to 0.210 dB/km;
the diameter of the mode field at 1310nm is more than or equal to 8.4 mu m, and the cut-off wavelength of the optical cable is less than or equal to 1260 nm;
the zero dispersion wavelength of the optical fiber is 1300-1324 nm, and the dispersion slope of the optical fiber at the zero dispersion wavelength is equal to or less than 0.088ps/nm2·km；
Its Abbe number at a wavelength of 1550nm is equal to or less than 17 ps/nm/km.
Its Abbe number at a wavelength of 1625nm is equal to or less than 21.4 ps/nm/km.
The macro-bending loss of the 1550nm window at the R10mm-1 turn is less than or equal to 0.03dB, and the macro-bending loss of the 1625nm window is less than or equal to 0.1 dB; the macrobending loss of a 1550nm window at R7.5mm-1 circle is less than or equal to 0.08 dB, and the macrobending loss of a 1625nm window is less than or equal to 0.25 dB; the macrobending loss of the 1550nm window in an R5.0mm-1 circle is less than or equal to 0.1db, and the macrobending loss of the 1625nm window is less than or equal to 0.3 db.
The specific test results are shown in the following table:
Figure 19100DEST_PATH_IMAGE030
Figure 510124DEST_PATH_IMAGE031
in the above embodiment: the depressed cladding is a linear optical fiber, and the typical refractive index profile is shown in fig. 1, in this embodiment, only the depressed cladding with uniform refractive index is taken as an example; the depressed cladding is an arc-shaped fiber with a typical refractive index profile as shown in FIG. 2; the lower cladding is semi-circular with a typical refractive index profile as shown in figure 3.
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 dispersion optimized bend insensitive optical fiber is characterized by comprising a core layer and a depressed cladding layer, wherein a transitional depressed cladding layer is arranged between the core layer and the depressed cladding layer, and the relative refractive index difference of the transitional depressed cladding layer is continuously changed from 0% from inside to outside to the relative refractive index difference of a junction point of the depressed cladding layer; the relative refractive index difference change curve of the transitional depressed cladding is
Figure 105396DEST_PATH_IMAGE001
A sub-parabolic distribution; the relative refractive index difference change curve of the transition depressed cladding can be expressed as:
Figure 491378DEST_PATH_IMAGE002
wherein
Figure 271116DEST_PATH_IMAGE003
For the transition of a certain point in the sunken cladding to the boundary distance of the cladding,
Figure 400746DEST_PATH_IMAGE004
is the relative refractive index difference at that point,
Figure 683959DEST_PATH_IMAGE001
in order to obtain the distribution index,
Figure 506422DEST_PATH_IMAGE005
the refractive index of the core layer is relative to pure silica i.e. its relative refractive index difference,
Figure 491564DEST_PATH_IMAGE006
in order to lower the refractive index of the cladding relative to pure silica i.e. its relative refractive index difference,
Figure 159306DEST_PATH_IMAGE007
the width of the cladding layer is reduced for transition;
said transition depressed cladding width
Figure 562606DEST_PATH_IMAGE007
Radius of core layer
Figure 555969DEST_PATH_IMAGE003
1Ratio of (A to B)
Figure 779140DEST_PATH_IMAGE003
2/
Figure 250573DEST_PATH_IMAGE003
1The value is between 1.2 and 2.0;
said transition depressed cladding width
Figure 508379DEST_PATH_IMAGE007
And depressed cladding width
Figure 157797DEST_PATH_IMAGE008
The following conditions are satisfied:
Figure 133843DEST_PATH_IMAGE009
the value is between 1.3 and 1.9;
said transition depressed cladding width
Figure 408967DEST_PATH_IMAGE007
4.5 to 8.0 μm.
2. The dispersion optimized bend insensitive optical fiber of claim 1, wherein the distribution index
Figure 521280DEST_PATH_IMAGE001
Between 0.25 and 5.
3. The dispersion optimized bend insensitive optical fiber of claim 2, wherein the distribution index
Figure 856446DEST_PATH_IMAGE001
Between 2 and 4.25.
4. The dispersion optimized bend insensitive optical fiber of claim 1, wherein said depressed cladding layer has a fluorine-doped volume
Figure 54209DEST_PATH_IMAGE010
And transition depressed cladding fluorine-doped volume
Figure 133024DEST_PATH_IMAGE011
Ratio of (A to B)
Figure 349110DEST_PATH_IMAGE012
The value is between 5 and 20; said transitional depressed cladding doped with fluorine volume
Figure 589599DEST_PATH_IMAGE011
And fluorine-doped volume of depressed cladding
Figure 540237DEST_PATH_IMAGE010
The calculation method of (c) is as follows:
Figure 157163DEST_PATH_IMAGE013
Figure 244068DEST_PATH_IMAGE014
Figure 655458DEST_PATH_IMAGE011
in order to transition the depressed cladding layer into a fluorine-doped volume,
Figure 827813DEST_PATH_IMAGE010
in order to lower the fluorine-doped volume of the cladding,
Figure 248430DEST_PATH_IMAGE007
the width of the cladding layer which is in transition depression,
Figure 672065DEST_PATH_IMAGE008
is the depressed cladding width.
5. The dispersion optimized bend insensitive optical fiber of claim 1, wherein said depressed cladding maximum relative refractive index difference
Figure 519935DEST_PATH_IMAGE006
The content of the active carbon is-0.55 to-0.20 percent.
6. The dispersion optimized bend insensitive optical fiber of claim 5, wherein the depressed cladding index depression is linear, arcuate, or semicircular.
7. The dispersion optimized bend insensitive optical fiber of claim 1, whereinThe core layer having a radius of
Figure 179586DEST_PATH_IMAGE015
3.0 to 4.0 μm, and the relative refractive index difference thereof
Figure 138315DEST_PATH_IMAGE005
0.30% -0.40%.
8. The dispersion optimized bend insensitive optical fiber of claim 1, wherein the glass portion of the optical fiber comprises, in order from inside to outside, a core layer, a depressed transition cladding layer, a depressed cladding layer, and the remainder being a layer of pure silica glass.
9. The dispersion optimized bend insensitive optical fiber of claim 8, wherein G657a2 standard is satisfied; the core layer of radius
Figure 199812DEST_PATH_IMAGE003
13.0 to 4.0 μm, and the relative refractive index difference thereof
Figure 218584DEST_PATH_IMAGE005
0.30% -0.40%; said depressed transition cladding having a width
Figure 99952DEST_PATH_IMAGE007
4.5 to 8.0 μm, and the relative refractive index difference thereof
Figure 846060DEST_PATH_IMAGE016
Satisfy the requirement of
Figure 762063DEST_PATH_IMAGE001
Parabolic distribution, distribution index
Figure 951736DEST_PATH_IMAGE001
Between 2 and 4; width of said depressed cladding
Figure 585980DEST_PATH_IMAGE008
5.0 to 9.0 μm, and the relative refractive index difference thereof
Figure 620932DEST_PATH_IMAGE006
Is-0.35 to-0.20 percent; or meets the G657B3 standard, the core layer, the radius of the core layer
Figure 391442DEST_PATH_IMAGE003
13.2 to 3.8 μm, and the relative refractive index difference
Figure 502749DEST_PATH_IMAGE005
0.35% -0.40%; said depressed transition cladding having a width
Figure 358709DEST_PATH_IMAGE007
4.5 to 7.0 μm, and the relative refractive index difference thereof
Figure 462931DEST_PATH_IMAGE016
Satisfy the requirement of
Figure 353527DEST_PATH_IMAGE001
Parabolic distribution, distribution index
Figure 885002DEST_PATH_IMAGE001
Between 2 and 5; said depressed cladding layer having a width
Figure 228259DEST_PATH_IMAGE008
5.0 to 8.0 μm, and the relative refractive index difference thereof
Figure 870593DEST_PATH_IMAGE006
The content is-0.55 to-0.40 percent.
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