Improved nonzero dispersion-shifted single-mode optical fiber with large mode field distribution

A non-zero dispersion, single-mode optical fiber technology, applied in the direction of multi-layer core/clad optical fiber, clad optical fiber, optical waveguide light guide, etc., can solve the problems of increased reflection and additional loss, and achieve improved stress distribution, Effects of PMD performance improvement and PMD performance stabilization

Active Publication Date: 2009-06-03
HANGZHOU FUTONG COMM TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In the actual long-distance optical fiber transmission system, it is usually necessary to connect different optical fibers to form a communication link. The refractive index distribution of the non-zero dispersion-shifted fiber is more complicated than that of the standard single-mode fiber. When they are together, due to the mismatch between the mode length and diameter of each other and the geometric parameters of the fiber, it often leads to increased reflection and increased additional loss. The longer the link, the more contacts, the greater the cumulative effect, and serious may cause unacceptable bit errors. Rate

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  • Improved nonzero dispersion-shifted single-mode optical fiber with large mode field distribution
  • Improved nonzero dispersion-shifted single-mode optical fiber with large mode field distribution
  • Improved nonzero dispersion-shifted single-mode optical fiber with large mode field distribution

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Experimental program
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Effect test

Embodiment 1

[0040] Such as figure 1 Shown is a kind of optical fiber waveguide refractive index distribution curve of the present invention, the following is a set of relative refractive index difference distribution parameters:

[0041] The parameters of the inner core layer Core1 are: Δn1 is about 0.60%, R1 is about 3.6um,

[0042] The parameters of the outer core layer Core2 are: Δn2 is about 0.25%, R2 is about 7.6um,

[0043] The parameters of the inner cladding Clad1 are: Δn3 is about 0.02%, R3 is about 12.8um,

[0044] The parameters of the ring core cladding Clad2 are: Δn4 is about 0.21%, R4 is about 17.2um,

[0045] The parameters of the outer cladding (that is, the outermost layer) Clad3 are: Δnc is about 0.00%, R5 is 125um,

[0046] The outer cladding Clad3 is a pure silica glass layer, and its refractive index is nc (Δnc=0),

[0047] The gradient distribution of the refractive index of the outer core layer Core2 satisfies the formula: n(r)=nc*[1-2Δ(r / r2) α ] 1 / 2 , where r...

Embodiment 2

[0061] according to figure 2 The shown optical fiber waveguide refractive index distribution curve, the following is a set of relative refractive index difference distribution parameters:

[0062] The parameters of the inner core layer Core1 are: Δn1 is about 0.58%, R1 is about 3.8um,

[0063] The parameters of the outer core layer Core2 are: Δn2 is about 0.24%, R2 is about 7.8um,

[0064] The parameters of the inner cladding Clad1 are: Δn3 is about -0.05%, R3 is about 13.0um,

[0065] The parameters of the ring core cladding Clad2 are: Δn4 is about 0.23%, R4 is about 18.2um,

[0066] The parameters of the outer cladding Clad3 are: Δnc is about 0.00%, R5 is about 125um,

[0067] The outer cladding Clad3 is a pure silica glass layer, and its refractive index is nc,

[0068] The gradient distribution of the refractive index of the outer core layer Core2 satisfies the formula: n(r)=nc*[1-2Δ(r / r2) α ] 1 / 2 ,That

[0069] In r1≤r≤r2, r is the radius variable of the outer cor...

Embodiment 3

[0085] according to image 3 The shown optical fiber waveguide refractive index distribution curve, the following is a set of relative refractive index difference distribution parameters:

[0086] The parameters of the inner core layer Core1 are: Δn1 is about 0.56%, R1 is about 4.0um,

[0087] The parameters of the outer core layer Core2 are: Δn2 is about 0.22%, R2 is about 8.0um,

[0088]The parameters of the inner cladding Clad1 are: Δn3 is about -0.07%, R3 is about 13.6um,

[0089] The parameters of the first ring core cladding Clad2 are: Δn4 is about 0.22%, R4 is about 19.2um,

[0090] The parameters of the second ring core cladding Clad3 are: Δn5 is about 0.-08%, R5 is about 20.8um,

[0091] The parameters of the outermost layer, that is, the outer cladding layer Clad4 are: Δnc is about 0.00%, R6 is 125um,

[0092] The cladding layer Clad4 is a pure silica glass layer with a refractive index nc (Δnc=0),

[0093] The gradient distribution of the refractive index of th...

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Abstract

The invention provides an improved nonzero dispersion-shifted single-mode optical fiber with large mode field distribution, comprising an optical fiber core layer, and a cladding covered on the optical fiber core layer; wherein, the optical fiber core layer comprises an internal core layer and an external core layer enclosing the internal core, both of which have different refractive indexes; the refractive index of the external core layer is gradually distributed; the cladding comprises an internal cladding, a ring-core cladding and an external cladding which are sequentially arranged from interior to exterior and have different refractive indexes; the external cladding layer is a pure SiO2 glass layer; the refractive index distribution of the optical fiber core layer meets the formula that n1 is more than n2 which is more than nc; the refractive index distribution of the cladding meets the formula that n4 is more than n3 which is more than nc or n4 is more than nc which is more than n3. The improved nonzero dispersion-shifted single-mode optical fiber has low nonlinear color-effect characteristic (namely large effective area), optimum dispersion and low dispersion efficiency, effectively solves the nonlinearity problem and polarization mode dispersion problem of high-speed communication, reduces the dispersion management cost and has low fusing loss, thus being applicable to large-capacity high-speed long-distance transmission system.

Description

technical field [0001] The invention relates to a non-zero dispersion-shifted single-mode optical fiber designed for a large-capacity, high-speed, long-distance transmission system. The fiber has improved characteristics of low nonlinear effect, that is, large mode field distribution (effective area), optimized chromatic dispersion and low dispersion slope, and has low polarization mode dispersion, low loss and excellent bending resistance, and is compatible with Fiber splicing has the advantages of low splicing loss, suitable for large-capacity, high-speed, long-distance dense wavelength division multiplexing DWDM system transmission, large effective area is conducive to reducing nonlinear effects, and low dispersion slope is conducive to the reduction of dispersion Comprehensive management to meet the long-distance transmission of C+L and S+C+L bands. Background technique [0002] With the development of optical fiber communication technology, especially the mature applic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/036G02B6/02
Inventor 吴金东卢卫民吴海港张立永
Owner HANGZHOU FUTONG COMM TECH CO LTD
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