CN1288523A - Low slope dispersion managed waveguide - Google Patents

Low slope dispersion managed waveguide Download PDF

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Publication number
CN1288523A
CN1288523A CN99802285A CN99802285A CN1288523A CN 1288523 A CN1288523 A CN 1288523A CN 99802285 A CN99802285 A CN 99802285A CN 99802285 A CN99802285 A CN 99802285A CN 1288523 A CN1288523 A CN 1288523A
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waveguide
fiber optic
dispersion
scope
optic component
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CN1120379C (en
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刘彦明
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Corning Inc
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Corning Inc
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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
    • G02B6/02214—Optical fibres with cladding with or without a coating tailored to obtain the desired dispersion, e.g. dispersion shifted, dispersion flattened
    • G02B6/02219—Characterised by the wavelength dispersion properties in the silica low loss window around 1550 nm, i.e. S, C, L and U bands from 1460-1675 nm
    • G02B6/02228—Dispersion flattened fibres, i.e. having a low dispersion variation over an extended wavelength range
    • G02B6/02233—Dispersion flattened fibres, i.e. having a low dispersion variation over an extended wavelength range having at least two dispersion zero wavelengths
    • 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
    • G02B6/02214—Optical fibres with cladding with or without a coating tailored to obtain the desired dispersion, e.g. dispersion shifted, dispersion flattened
    • G02B6/02219—Characterised by the wavelength dispersion properties in the silica low loss window around 1550 nm, i.e. S, C, L and U bands from 1460-1675 nm
    • G02B6/02247—Dispersion varying along the longitudinal direction, e.g. dispersion managed fibre
    • 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
    • G02B6/02214—Optical fibres with cladding with or without a coating tailored to obtain the desired dispersion, e.g. dispersion shifted, dispersion flattened
    • G02B6/02219—Characterised by the wavelength dispersion properties in the silica low loss window around 1550 nm, i.e. S, C, L and U bands from 1460-1675 nm
    • G02B6/02252—Negative dispersion fibres at 1550 nm
    • G02B6/02261—Dispersion compensating fibres, i.e. for compensating positive dispersion of other fibres
    • 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
    • G02B6/03616—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
    • G02B6/03661—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 4 layers only
    • G02B6/03666—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 4 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
    • G02B6/02214—Optical fibres with cladding with or without a coating tailored to obtain the desired dispersion, e.g. dispersion shifted, dispersion flattened
    • G02B6/02285—Characterised by the polarisation mode dispersion [PMD] properties, e.g. for minimising PMD
    • 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
    • G02B6/028—Optical fibres with cladding with or without a coating with core or cladding having graded refractive index
    • G02B6/0281—Graded index region forming part of the central core segment, e.g. alpha profile, triangular, trapezoidal core

Abstract

Disclosed is a single mode optical waveguide fiber having alternating segments of positive and negative dispersion and dispersion slope. The relative indexes, the refractive index profiles and the radii of the segments are chosen to provide low total dispersion and dispersion slope. One embodiment consists of a first central major index profile (10) of outer radius r1, surrounded by a first annular segment (12) of outer radius r2, surrounded by second annular segment (14) of outer radius r3. Preferred waveguides in accordance with the invention exhibit a dispersion over the range of 1520 to 1625 nm which at all times have a magnitude which is less than 2, and more preferably less than 1 ps/nm2-km. The total dispersion of the waveguide fiber is in the range of about -2.0 to +2.0 ps/nm-km at 1550 nm. The waveguide also features a low polarization mode dispersion.

Description

Low slope dispersion managed waveguide
Invention field
The present invention relates generally to for long transponder at interval, the single-mode optical waveguide fiber that designs of the telecommunication system of high data rate.Particularly, single mode waveguide combines required characteristic in good counter-bending, low decay, low chromatic dispersion and low-dispersion slope and the long Distance Transmission application.
Technical background
Telecommunications industry takes place need not electronic signal again, and the requirement of bigger information capacity has caused the revolution once more of single-mode fiber index distribution design on long distance.
The immediate development of Erbium-Doped Fiber Amplifier (EDFA) (EDFA) and wavelength-division multiplex technique can produce jumbo lightwave system.In order to realize high capacity, can increase channel bit rate and signal wavelength range.When bit rate increased to above 2.5Gb/s, fibre-optical dispersion became a main degeneration factor of long distance.On the other hand, if chromatic dispersion is too low, multi channel interaction can cause that four ripples mix and the degeneration system performance.Degenerate in order to reduce chromatic dispersion and FWM, it was suggested and experimental demonstration chromatic dispersion control.Chromatic dispersion control can be controlled by cable control and optical fiber and realize, the former alternately splices+D and-D optical fiber, the latter will have+the core stem of D and-D characteristic combines, and is drawn into an optical fiber.
So far, proposed to utilize have positive dispersion slope+D and-chromatic dispersion of D optical fiber control, wherein, final fibre-optical dispersion has chromatic dispersion and the slope that is similar to dispersion-shifted fiber, in other words, clean zero chromatic dispersion is in the 1550nm window, and total chromatic dispersion gradient is positive.Yet, still need other design of dispersion managed waveguide.
Definition
To give a definition according to the conventional usage of this area.Index distribution is with the radius definition of the section of similar refractive index.Specific section has first and last refractive index point.The radius of the position from the waveguide core line to this first refractive index point is the internal diameter of core district or section.Equally, the radius of the position from the waveguide core line to this last refractive index point is the external diameter of core section.
The radius of section can be limited easily by many methods, as following to finding out in the description of Fig. 1.In Fig. 1-3, table 1 and 2 is derived thus, and the radius of index distribution section is defined as follows, here with reference to the chart that is meant Δ % and wavelength radius:
* the external diameter r that distributes of center principal refractive index 1Be the joining that measures distribution of extrapolation refractive index of the centre and x axle from the longitudinal center line of waveguide, the i.e. point of Δ %=0;
* the external diameter r of first ring segment 2Be the joining that measures extrapolation or practical center index distribution and x axle from the longitudinal center line of waveguide, the i.e. point of Δ %=0;
* the external diameter r of second ring segment 3Be the joining that measures distribution of extrapolation refractive index of the centre and x axle from the longitudinal center line of waveguide, the i.e. point of Δ %=0;
The external diameter of * any additional ring segment is the outside diameter measuring of simulation first and second ring segments;
* the radius of last ring segment is the mid point that middle waveguide core line measures this section.
The internal diameter of the width w section of being taken as of section and the distance between the external diameter.The external diameter of the section of should be understood that is corresponding to the internal diameter of next section.
-refractive index is defined by following equation
Δ %=100 * (n 1 2-n 2 2)/2n 1 2, n here 1Be the largest refractive index of index distribution section 1, n 2Be with reference to refractive index, it is taken as the refractive index of covering in this application.
-term index distribution is meant in the relation between Δ % or refractive index and the radius on the selected portion of core.
-term α distributes and is meant the index distribution of representing with Δ (b) % item, and b is a radius here, and it follows following equation
Δ (b) %=Δ (b 0) (1-[︳ b-b 0|/(b 1-b 0)] α), b here 0Be that refractive index is maximum radius point, b 1Be that Δ (b) % is zero point, b is a scope, b i≤ b≤b f, here, Δ defines as above, b iBe the starting point that α distributes, b fBe the terminal point that α distributes, α is the real number index.
Other index distribution comprises step refractive index, triangle, irregular quadrilateral and step cutting pattern refractive index, wherein circular is normally caused by diffusion of contaminants in the zone of quick variations in refractive index.
-total dispersion is defined as the algebraic sum of waveguide dispersion and material dispersion.In the art, total dispersion is sometimes referred to as chromatic dispersion.The unit of total dispersion is ps/nm-km.
The counter-bending induction decay that is expressed as under the regulation test condition of-waveguide fiber.Standard test condition comprises waveguide fiber that encloses around 75mm diameter axle 100 and the waveguide fiber that encloses around 32mm diameter axle 1.Under each test condition, measure crooked induction decay, be unit with db/ (unit length) usually.In this application, the flexural measurement of employing is that the harsher working environment for this waveguide fiber needs the test of requirements at the higher level around the waveguide fiber of 20mm diameter axle 5 circles.
Summary of the invention
One aspect of the present invention relates to a kind of single-mode optical waveguide, comprise the first fiber optic component section with positive dispersion and positive dispersion slope and the second fiber optic component section of negative dispersion and negative dispersion slope, wherein, waveguide is along its length checker between first fiber optic component and second fiber optic component, wherein, the length of the first fiber optic component section is the twice of the second fiber optic component segment length at least.About the operation wavelength window of the low decay of 1550nm, in the window between promptly about 1520nm to 1625nm, make waveguide realize optimization.
Can form by wherein having each unitary optical fiber of first and second sections according to waveguide of the present invention, for example, the section of positive and negative chromatic dispersion and chromatic dispersion gradient is alternately formed.On the other hand, waveguide can be made up of optical cable, and wherein each fiber optic component section couples together along cable length.
Single-mode optical waveguide by providing little total dispersion and low chromatic dispersion gradient to control fibre-optical dispersion is provided another aspect of the present invention.Preferable waveguide according to the present invention presents chromatic dispersion on 1520 to 1625nm scopes, its amplitude is always less than 2, preferably less than 1ps/nm 2-km.Waveguide fiber in-2.0 to+2.0ps/nm-km scope approximately, is-1.0 to+1.0 at the total dispersion at 1550nm place better, preferably-0.5 to+0.5ps/nm-km.The r of each positive and negative dispersion sections i, Δ i% and index distribution can also be chosen as the overall attenuation that is provided at the 1550nm place and be not more than 0.25dB/km.
All these characteristics are to realize when keeping high strength, good fatigue resistance and good resistance bendability, and the bending loses that promptly brings out is for being not more than 0.5dB around 32mm axle 1 circle, for being not more than 0.05dB around 75nm axle 100 circles.According to waveguide of the present invention can also with the optical amplifier compatibility.In addition, the cutoff wavelength of the optical fiber of optical cable form is less than 1520nm.Additional benefit is that polarization mode dispersion is less than about .5ps/ (km) 1/2, less than .3ps/ (km) 1/2Then better, be about .1ps/ (km) usually 1/2
In the following detailed description, will provide supplementary features of the present invention and advantage, for the professional of this area, be obvious or pass through to implement the present invention as described herein from above description part feature and advantage, comprise the following detailed description, claims and accompanying drawing are as can be seen.
Should be understood that above general description and the following detailed description only are examples of the present invention, be desirable to provide a summary or framework, to understand essence of the present invention and feature.The accompanying drawing that comprises can provide further understanding of the present invention, and constitutes the part of this instructions.Accompanying drawing illustrates various embodiment of the present invention, combines with explanation and can explain principle of the present invention and work.
The accompanying drawing summary
The negative dispersion optical fiber section that Fig. 1 illustrates for the present invention's experiment distributes.
Fig. 2 illustrates according to another kind of negative dispersion optical fiber section index distribution of the present invention.
Fig. 3 illustrates another kind of preferable negative dispersion optical fiber section and distributes.
Fig. 4 illustrate according to of the present invention alternately+D and-D section CHROMATIC DISPERSION IN FIBER OPTICS characteristic.
Fig. 5 illustrates chromatic dispersion and relation according to the distance of chromatic dispersion graduation of the present invention and dispersion control optical fiber.
Fig. 6 illustrates chromatic dispersion and relation according to the wavelength curve of chromatic dispersion graduation of the present invention and chromatic dispersion control.
The detailed description of preferred embodiment
To describe preferred embodiment of the present invention in detail now, the some of them example is described by means of accompanying drawing.As long as in possible place, in whole accompanying drawing, will adopt and be denoted by like references same or similar parts.
In the present invention, the fibre-optic waveguide of low slope and chromatic dispersion control is to realize by the section that first fiber optic component that will have positive dispersion and positive dispersion slope and second fiber optic component with negative dispersion and negative dispersion slope synthesize alternately, wherein the length of first fiber optic component is the twice of the second fiber optic component length at least, be preferably three times, preferably at least five times.
Waveguide of the present invention can be for having the alternately form of the unitary optical fiber of section of positive negative dispersion and chromatic dispersion gradient.For example, be assembled in a pipe or other supporting device by the alternately die panels that will have required index distribution and can make this optical fiber.Alternately die panels can produce the required positive and negative dispersion characteristics that replace.Including these pipes that replace the element small pieces then can be covered by the silica covering, and the preform of generation is by fixed and be drawn into jointed fiber, and it presents the alternating segments with positive negative dispersion and chromatic dispersion gradient along its length.Further disclosed this manufacturing technology in the U.S. Patent application of submitting on April 23rd, 1,997 08/844,997, the instructions of this patented claim and accompanying drawing are all incorporated by reference at this.
In another embodiment, waveguide is made of the optical cable waveguide.For example, waveguide can by have positive dispersion and positive dispersion slope, its length 50km at least, at least then better first fiber optic component of 75km and have negative dispersion and negative dispersion slope, its length is less than 20km, form less than then better second fiber optic component of 15km.This optical cable waveguide can be arranged between the amplifier in the optical fiber telecommunications system.Second fiber optic component can alternately be placed in amplifier interior the amplifier side or amplifier module self.
First fiber optic component, the fiber optic component that promptly has positive dispersion and chromatic dispersion gradient can provide as the SMF28 that is provided by Corning Incorporated by utilizing traditional single-mode fiber.The total dispersion of SMF-28 at the 1550nm place is 17ps/nm.km, and chromatic dispersion gradient is 0.06ps/nm 2Km.
Second fiber optic component that can adopt various fiber distribution to provide to have negative dispersion and negative dispersion slope.In preferred embodiment of the present invention, the distribution of negative element fiber segment has three sections or four sections.
Fig. 1 illustrates an embodiment of three sections this preferable distributions of negative dispersion, negative dispersion slope fiber segment element.The distribution of Fig. 1 is by external diameter r 1The first center principal refractive index distribute 10, by external diameter r 2 First ring segment 12 around, by external diameter r 3 Second ring segment 14 around and form.As shown in the figure, can adopt various distribution shapes, for example adopt with Fig. 1 in the relevant dotted line of possible distribution shape of the first center principal refractive index distribution 10.
Novel single-mode optical waveguide is characterised in that the core design of its segmentation, and it provides the extraordinary combination of given characteristic here.The realization of these characteristics is by the suitable refractive index profile shape of selecting each section and the suitable relative index of refraction Delta of selecting each section, Δ i%, radius, r iDistribution parameter is known to be interactional.For example, α is about 1 center α and distributes and will have the radius that is different from the center with irregular quadrilateral refractive index, and the optical fiber of the characteristic with basically identical is provided.
In fact the index distribution of each section can be any given shape, comprises that α distributes, stepped appearance distributes or irregular quadrilateral distributes.Unless insert special step during the course, in the place that refractive index suddenly changes, index distribution will be circular.Circle is owing to be used to change the diffusion of the dopant material of host glass refractive index and cause.Therefore it is round can making any of these index distribution on specified point.For example, the ladder index distribution with positive Δ % will have round last angle and inferior horn usually.
What provide in the following table 1 is to be used to form the radius of 3 sections distributions of negative dispersion of the present invention, negative dispersion slope fiber segment and the preferable parameter of Delta.As it can be seen from the table, optical fiber can comprise or not comprise the central concave index region, and this is normally caused by the migration of Ge-doped thing.
Table 1
Radius (micron) Delta (%)
r 1????1.25-5???????????0.5-2
r 2????1.25-10?????????-0.5--0.1
r 3????2.5-15???????????0.1-1.0
The core section small pieces of the negative dispersion optical fiber shown in Fig. 1 are combined with the conventional single mode fiber (SMF28) with positive dispersion and positive dispersion slope, are drawn into optical fiber.Present negative dispersion by the optical fiber shown in the solid line among Fig. 1 at the 1550nm place, i.e. about-35ps/nmkm and about 0.15ps/nm 2The chromatic dispersion gradient of km.Therefore, in this case, (D SMF/ S SMF)=17/0.06=280, and (D n/ S nThe 35/0.15=-233 of)=-.Therefore, (D p/ S p)/(D n/ S n)=0.83, it quite approaches 1, as required.
Fig. 2 illustrates four sections fiber cores and distributes, and it is as negative dispersion slope dispersive optical fiber section of the present invention.Distribution shown in Fig. 2 adds two refractive index negative areas 12 and 16.
What provide in the following table 2 is to be used to form the radius of these four sections distributions of negative dispersion of the present invention, negative dispersion slope fiber segment and the preferable parameter of Delta.
Table 2
Radius (micron) Delta (%)
????r 1 ????1.25-5 ????0.5-2
????r 2 ????1.25-10 ???-0.5--0.1
????r 3 ????2.5-15 ????0.1-1.0
????r 4 ????5-25 ???-0.5-0
Here any distribution of Jie Shiing also can comprise the center line tip portion, and it is the recessed relative index of refraction district less than the peak value Delta of the first main core section.Normally burnouted by so-called dopant ions or move and cause that this appears at during the manufacturing of fibre-optic waveguide sometimes in this center line tip.
Preferably present chromatic dispersion on 1520 to 1625nm scopes according to waveguide of the present invention, its amplitude is always less than 2, less than 1ps/nm 2-km is then better.Waveguide fiber approximately-2.0 to+2.0, preferably-1.0 to+1.0, is preferably in-0.5 to+0.5ps/nm-km at the total dispersion of 1550nm.Also can select the r of each positive and negative dispersion sections i, Δ i% and index distribution, the overall attenuation that is provided at 1550nm is not more than 0.25dB/km.
All these characteristics can realize when keeping high strength, good fatigue resistance and good resistance bendability, promptly bring out bending loses for around 32mm axle 1 circle, are not more than 0.5dB, for around 75mm axle 100 circles, are not more than 0.05dB.Can also be compatible mutually according to waveguide of the present invention with optical amplifier.In addition, the cutoff wavelength of the optical fiber of optical cable form is less than 1520nm.Additional benefit is that polarization mode dispersion is less than 0.5ps/ (km) 1/2, better less than 0.3ps/ (km) 1/2
A specific preferable dispersion managed waveguide of the present invention is controlled fibre-optical dispersion by negative total dispersion and low chromatic dispersion gradient are provided.Suppressing that potential soliton forms is in the important system, need the total dispersion of waveguide fiber to bear, thereby it is non-linear from phase modulation (PM) (high-power signal is taken place) that linear dispersion can not be offset.For balanced fibre-optical dispersion, preferably satisfy following relation as much as possible:
D pL p+D nL n=0
Here D and L represent chromatic dispersion and fiber lengths, footnote " p " and the positive and negative dispersive optical fiber element of " n " representative.In addition, for balanced chromatic dispersion gradient, preferably satisfy following relation as much as possible:
(D p/ S p)/(D n/ S n)=1, S is a chromatic dispersion gradient here.
Waveguide as described herein is suitable for high-power and long Distance Transmission uses, and comprises traditional RZ (making zero) or NRZ (non-return-to-zero) and soliton transmission application.Definition high-power and long distance only is meaningful in the scope of specific telecommunication system, has wherein stipulated bit rate, bit error rate (BER), multiplexing scheme, has perhaps also had optical amplifier.Also having some additive factors, is known for this area professional and technical personnel, to the implication generation effect of high-power and long distance.Yet extensively, the high-power optical power of each channel that is meant is greater than about 10mW.In some applications, 1mW even littler signal power level are still to the nonlinear effect sensitivity, so that A EffRemain an important consideration foundation in this low power system.
Long distance is meant that two distances between the electronics regenerator can surpass 100 to 120km distance.Regenerator is different from the transponder that utilizes optical amplifier.Transponder at interval, especially in the high data density system, can be less than half of regenerator spacings.
By following hope is that the example of example of the present invention can further be understood fully the present invention.
Example
Fig. 3 illustrates preferable three sections index distribution as negative dispersion, negative slope fiber segment.This specific distribution shows chromatic dispersion-35.47ps/nm.km, slope-0.1018ps/nm at the 1550nm place 2.km.At the 1550nm place, cutoff wavelength is 1.18 microns, and pga bending loses 1.3dB, MFD are that 4.8 microns, Deff are 4.68 microns.
Fig. 4 is illustrated in this situation of SMF-28, and the dispersion characteristics that realized when the various negative dispersion optical fiber elements that disclose among positive dispersion fiber element and Fig. 3 are combined have following parameter:
Delta (%) radius (μ m)
Core 2 2.2 (r 1)
First groove-0.4 5.76 (r 2)
Annulus 0.6 6.72 (r 3)
Following table 3 is listed final chromatic dispersion and chromatic dispersion gradient characteristic, and the ratio of chromatic dispersion and chromatic dispersion gradient, and this is that this combination by the fiber segment that replaces realizes.
Table 3
+ D optical fiber-D optical fiber
D(ps/nm.km)????17???????-35
S(ps/nm 2.km)???0.058????-0.1018
D/S(nm)????????293???????350
Fig. 5 illustrates the axial design of final waveguide fiber, represents with the chromatic dispersion on the waveguide length (nm.km) of final chromatic dispersion graduation, dispersion control optical fiber.
Fig. 6 illustrates the final total dispersion characteristic of chromatic dispersion graduation and control optical fiber.L in this example p/ L nBe about 2: 1.Period L n+ L pBe about 3km.As can be seen from Figure 6, She Ji example hereto, from 1520 to 1620nn, total dispersion is much smaller than 1ps/nm.kmn, in fact, less than about 0.5ps/nm.km.This low loss window with single-mode fiber is consistent.According to the loss spectrum of conventional single mode fiber, from 1520 to 1620nm, decay is less than 0.22dB/km.
Those skilled in the art are apparent, can make various improvement and variation to the present invention, and can not depart from the spirit and scope of the present invention.Therefore, wish that the present invention covers improvement and the variation to this invention within the scope of appended claims and equivalent thereof.

Claims (19)

1. a single-mode optical waveguide is characterized in that described waveguide comprises: have first fiber optic component of positive dispersion and positive dispersion slope and second fiber optic component with negative dispersion and negative dispersion slope.
2. waveguide as claimed in claim 1 is characterized in that: the length of described first fiber optic component is at least the twice of the described second fiber optic component length.
3. waveguide as claimed in claim 1 is characterized in that: the length of described first fiber optic component is at least five times of the described second fiber optic component length.
4. waveguide as claimed in claim 1 is characterized in that: described first and second fiber optic components are chosen such that and make described waveguide present chromatic dispersion on 1520 to 1625nm scope that its amplitude is always less than 2ps/nm 2-km.
5. waveguide as claimed in claim 1 is characterized in that: described first and second fiber optic components are chosen such that and make described waveguide present chromatic dispersion on 1520 to 1625nm scope that its amplitude is always less than 1ps/nm 2-km.
6. waveguide as claimed in claim 1 is characterized in that: described first and second fiber optic components are chosen such that and make total dispersion that described waveguide presents at the 1550nm place in-2.0 to+2.0ps/nm-km scope approximately.
7. waveguide as claimed in claim 1 is characterized in that: described first and second fiber optic components are chosen such that and make total dispersion that described waveguide presents at the 1550nm place in-2.0 to 0.0ps/nm-km scope approximately.
8. waveguide as claimed in claim 7 is characterized in that: for enclosing around 32mm axle 1, the bending loses that brings out that described waveguide presents is not more than about 0.5dB, and the cutoff wavelength of the optical fiber of optical cable form is less than 1520nm, and polarization mode dispersion is less than about 0.5ps/ (km) 1/2
9. waveguide as claimed in claim 1 is characterized in that: described waveguide comprises the optical cable waveguide, and described waveguide is arranged between the amplifier, and the length of described first element is at least 50km, and the length of described second fiber optic component is 20km at least.
10. waveguide as claimed in claim 1 is characterized in that: described waveguide comprises the optical cable waveguide, and described waveguide is arranged between the amplifier, and the length of described first element is at least 75km, and the length of described second fiber optic component is 15km at least.
11. waveguide as claimed in claim 1 is characterized in that: described first fiber optic component comprises the single-mode fiber with stepped appearance index distribution.
12. waveguide as claimed in claim 11 is characterized in that: described second fiber optic component comprises the core with at least three sections, wherein the external radius r of first section 1At the scope of about 1.25 to 5.0 μ m, Δ 1% is in 0.5 to 2.0% scope; The external radius r of second section 2At the scope of about 1.25 to 10.0 μ m, Δ 2% is in-0.5 to-0.1% scope; The external radius r of the 3rd section 3At the scope of about 2.5 to 15.0 μ m, Δ 3% is in 0.1 to 1.0% scope.
13. waveguide as claimed in claim 12 is characterized in that: described second fiber optic component further comprises the 4th section, its external radius r 2At the scope of about 5.0 to 25.0 μ m, Δ 2% is in-0.5 to-0.05% scope.
14. single-mode optical waveguide, it is characterized in that described waveguide comprises: have first fiber optic component of positive dispersion and positive dispersion slope and second fiber optic component with negative dispersion and negative dispersion slope, wherein, the length of described first fiber optic component is at least the twice of the described second fiber optic component length, described first and second fiber optic components are to select like this, make described waveguide present chromatic dispersion on 1520 to 1625nm scope, its amplitude is always less than 2ps/nm 2-km.
15. waveguide as claimed in claim 14 is characterized in that: the length of described first fiber optic component is at least five times of the described second fiber optic component length.
16. waveguide as claimed in claim 15 is characterized in that: described first and second fiber optic components are chosen such that and make described waveguide present chromatic dispersion on 1520 to 1625nm scope that its amplitude is always less than 1ps/nm 2-km.
17. waveguide as claimed in claim 14 is characterized in that: described first and second fiber optic components are chosen such that and make total dispersion that described waveguide presents at the 1550nm place in-2.0 to+2.0ps/nm-km scope approximately.
18. waveguide as claimed in claim 17 is characterized in that: described first fiber optic component comprises the single-mode fiber with stepped appearance index distribution, and described second fiber optic component comprises the core with at least three sections, wherein the external radius r of first section 1At the scope of about 1.25 to 5.0 μ m, Δ 1% is in 0.5 to 2.0% scope; The external radius r of second section 2At the scope of about 1.25 to 10.0 μ m, Δ 2% is in-0.5 to-0.1% scope; The external radius r of the 3rd section 3At the scope of about 2.5 to 15.0 μ m, Δ 3% is in 0.1 to 1.0% scope.
19. single-mode fiber as claimed in claim 1 is characterized in that: second fiber optic component is placed in the optical amplifier.
CN99802285A 1998-02-23 1999-02-17 Low slope dispersion managed waveguide Expired - Fee Related CN1120379C (en)

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Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1054275B1 (en) 1998-12-03 2008-05-07 Sumitomo Electric Industries, Ltd. Dispersion equalization optical fiber and optical transmission line including the same
TW451088B (en) 1999-04-16 2001-08-21 Sumitomo Electric Industries Optical fiber and optical transmission line including the same
FR2799006B1 (en) * 1999-09-02 2002-02-08 Cit Alcatel OPTICAL FIBER FOR ONLINE COMPENSATION OF THE CHROMATIC DISPERSION OF AN OPTICAL FIBER WITH POSITIVE CHROMATIC DISPERSION
WO2001022134A1 (en) 1999-09-17 2001-03-29 Sumitomo Electric Industries, Ltd. Optical transmission line
DE10010783A1 (en) * 2000-03-04 2001-09-06 Deutsche Telekom Ag Single-mode optical fibre, has refractive index in second radial section that is less than that of outer section
JP5033290B2 (en) * 2000-03-30 2012-09-26 コーニング インコーポレイテッド Dispersion gradient compensation optical waveguide fiber
US6640038B2 (en) 2000-05-31 2003-10-28 Corning Incorporated Dispersion managed fibers having reduced sensitivity to manufacturing variabilities
FR2815418B1 (en) 2000-10-16 2003-05-16 Cit Alcatel FIBER FOR THE CHROMATIC DISPERSION COMPENSATION OF A NZ-DSF FIBER WITH POSITIVE CHROMATIC DISPERSION
FR2815420B1 (en) * 2000-10-16 2003-05-16 Cit Alcatel COMPENSATION OF CHROMATIC DISPERSION IN A FIBER OPTIC TRANSMISSION SYSTEM, AND FIBER OF COMPENSATION
FR2816065B1 (en) 2000-10-26 2003-01-17 Cit Alcatel OPTICAL FIBER FOR THE ONLINE COMPENSATION OF THE CHROMATIC DISPERSION OF A POSITIVE CHROMATIC DISPERSION OPTICAL FIBER
DE60110634T2 (en) * 2000-12-28 2006-01-19 Pirelli & C. S.P.A. OPTICAL SOLITON TRANSMISSION SYSTEM WITH DISPERSION MANAGEMENT
US7151880B2 (en) 2000-12-28 2006-12-19 Prysmian Cavi E Sistemi Energia S.R.L. Dispersion-managed optical soliton transmission system
DE60219147T2 (en) * 2001-03-30 2007-12-13 Corning Incorporated OPTICAL TRANSMISSION LINE
CA2380342A1 (en) * 2001-04-13 2002-10-13 The Furukawa Electric Co., Ltd Dispersion management optical transmission system and optical transmission line
FR2828939B1 (en) * 2001-08-27 2004-01-16 Cit Alcatel OPTICAL FIBER FOR A WAVELENGTH MULTIPLEXED TRANSMISSION SYSTEM
AU2003210934A1 (en) 2002-02-15 2003-09-09 Corning Incorporated Low slope dispersion shifted optical fiber
US6768847B2 (en) 2002-03-15 2004-07-27 Fitel Usa Corp. Dispersion compensating module and fiber for control of residual dispersion
FR2842610B1 (en) * 2002-07-18 2004-11-12 Cit Alcatel OPTICAL FIBER WITH DISPERSION MANAGEMENT
FR2845486B1 (en) 2002-10-07 2005-01-28 Cit Alcatel OPTICAL FIBER HAVING CHROMATIC DISPERSION COMPENSATION
JP5408834B2 (en) * 2003-10-03 2014-02-05 ドラカ・コムテツク・ベー・ベー Chromatic dispersion compensating optical fiber

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5448674A (en) * 1992-11-18 1995-09-05 At&T Corp. Article comprising a dispersion-compensating optical waveguide
AU693329B2 (en) * 1995-04-13 1998-06-25 Corning Incorporated Dispersion managed optical waveguide
CA2195614C (en) * 1996-02-16 2005-06-28 George F. Wildeman Symmetric, dispersion-manager fiber optic cable and system
US5611016A (en) * 1996-06-07 1997-03-11 Lucent Technologies Inc. Dispersion-balanced optical cable
EP0857313A4 (en) * 1996-07-31 2000-04-12 Corning Inc Dispersion compensating single mode waveguide
US5781684A (en) * 1996-12-20 1998-07-14 Corning Incorporated Single mode optical waveguide having large effective area

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EP1066540A4 (en) 2005-05-18

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