CN1479121A - New type chromatic dispersion optical fiber - Google Patents
New type chromatic dispersion optical fiber Download PDFInfo
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- CN1479121A CN1479121A CNA031190677A CN03119067A CN1479121A CN 1479121 A CN1479121 A CN 1479121A CN A031190677 A CNA031190677 A CN A031190677A CN 03119067 A CN03119067 A CN 03119067A CN 1479121 A CN1479121 A CN 1479121A
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Abstract
A low-dispersion optical fibre for the multi-channel narrow-space DWDM and CWDM on S-C-L and E-S-C-L-U wavebands is sequentially composed of fibre core, concave rings with the first refractivity, the concave rings with the second refractivity, external core, internal cladding layer and external cladding layer.
Description
Technical field
The present invention relates to a kind of single-mode transmission optical fiber that is used in the fiber optic communication field high-speed high capacity, particularly a kind of novel low dispersion fiber.
Background technology
Optical fiber communication is the technical foundation of information society, and development optical fiber communication new technology is significant; In order to satisfy the demand that society increases day by day to the rate of information throughput, Fibre Optical Communication Technology needs constantly development, develop with stylish application, and mainly be that the development of Metropolitan Area Network (MAN) aspect is very fast; The growth requirement of long-distance aspect tends towards stability; Income, cost and profit are being paid close attention in the industry of overall optical fiber communication more nearly like this.From technology and consideration economically, the Fibre Optical Communication Technology development mainly comprises 2 general orientation.One improves the single-channel transfer rate of wavelength-division multiplex; Its two, increase the channel quantity of wavelength-division multiplex.Therefore the optical s/n ratio of system requirements requires higher signal light power along with single-channel speed improves and the increase that is directly proportional, and this makes fiber nonlinear effect more become serious.Owing to wavelength-division multiplex transmission wavelength range expansion, the chromatic dispersion of edge channel accumulation makes optical fiber dispersion compensation complicated more, has influenced system cost again.Above situation is promoting Fibre Optical Communication Technology and is continuing development, constantly requires the optical fiber technology innovation.Both required to satisfy the demand that day by day increase of society, considered economic benefit again information transmission.This just need widen the optical fibre wavelength-division multiplex operating wavelength range, and will pay attention to reducing every bit cost, is implemented in the longer wavelength coverage and can carries out wdm applications, and reduce the dispersion management cost greatly, especially wants to satisfy the growth requirement of Metropolitan Area Network (MAN).
At present existing various optical fiber all can not be well in short-wave band (S-band: 1460-1530nm), common wave band (C-band: 1530-1565nm), (L-band: 1565-1625nm) there are different defectives separately in such three wave bands simultaneously with high transfer rate work to long-wave band.Subject matter is: factors such as nonlinear effect, chromatic dispersion can not be taken into account in this wavelength coverage.G.652 optical fiber is big in the chromatic dispersion of S, C, L band, the chromatic dispersion gradient height; Therefore, the dispersion compensation difficulty increases system cost.G.653 optical fiber has zero-dispersion wavelength at C, and useful area is less; Therefore, nonlinear effect such as FWM is serious.G.654 the cutoff wavelength of optical fiber is than S belt length; Chromatic dispersion at S, C, L band is big, the chromatic dispersion gradient height; Therefore, the operating wavelength range deficiency, the dispersion compensation difficulty increases system cost.G.655 one of key issue of optical fiber be some G.655 the cutoff wavelength of optical fiber than S belt length; Some G.655 the zero-dispersion wavelength of optical fiber be with at S; G.655 optical fiber is low excessively in the chromatic dispersion of S band or S, C, L band for some, so nonlinear effect such as four-wave mixing is serious.
Though G.655 the optical fiber kind is numerous now, at existing great majority G.655 in the optical fiber,, also to increase system cost in the compensation of loosing of the enterprising circumstances in which people get things ready for a trip of L-band even transmission range is 80 kilometers.In addition, some G.655 optical fiber on S-band, have zero dispersion values.Like this, to use caused four-wave mixing in this optical fiber will be a very big problem to DWDM.So G.655A optical fiber and G.655B optical fiber can not satisfy system development requirement.In a word, existing various single-mode fiber all can not adapt at three continuous wave bands of S-C-L and carries out the narrow interval of multichannel dense wave division multipurpose (DWDM) and Coarse Wavelength Division Multiplexing (CWDM).
Summary of the invention
The technical problem to be solved in the present invention is the defective at existing product, a kind of novel low dispersion single-mode optical fiber is provided, and it has solved existing various single-mode fiber all can not adapt to the problem of carrying out the narrow interval of multichannel dense wave division multipurpose (DWDM) and Coarse Wavelength Division Multiplexing (CWDM) at three continuous wave bands of S-C-L.
Technical scheme of the present invention is achieved in that it comprises fibre core and covering, it is characterized in that: on fibre core (1), be coated with the first refractive index lower concave ring (2), on the first refractive index lower concave ring (2), be coated with the second refractive index lower concave ring (3), core (4) outside the second refractive index lower concave ring (3) is gone up covering, core (4) is gone up and is covered inner cladding (5) outside, goes up at inner cladding (5) and covers surrounding layer (7).The present invention's first refractive index lower concave ring width d1 scope is: 0.5 μ m≤d1≤2.5 μ m, and the second refractive index lower concave ring width d2 scope is 0.5 μ m≤d2≤2.5 μ m; Absolute index of refraction n1, the n2 of the first refractive index lower concave ring and the second refractive index lower concave ring satisfies 1.447≤n1≤1.456 and 1.448%≤n2≤1.457 respectively.Additive Si has mixed in the first refractive index lower concave ring (2) and the second refractive index lower concave ring (3)
2F
6Or C
2F
6, its doping is respectively 0.15%～0.9% and 0～0.75%; The present invention does not have zero-dispersion wavelength in 1460 nanometers in 1625 nanometer wavelength range; 1460 nanometers to 1625 nanometer wavelength range internal dispersions between 2～8ps/nm.km, chromatic dispersion gradient is not more than 0.03ps/nm
2.km, its cutoff wavelength is not more than 145nm; In 1675 nanometer wavelength range, between the 13ps/nm.km, its cutoff wavelength is not more than 1350mm at 1ps/nm.km in chromatic dispersion in 1360 nanometers.
Below principle of the present invention is elaborated:
Development along with optical communication, requirement to single-mode fiber further improves, and current application trend specifically has following characteristics: contrast G.655 optical fiber, dispersion characteristics are more excellent, operation wavelength is wideer: in the 1460-1625nm wavelength coverage, chromatic dispersion can suppress the various nonlinear effects in the dwdm system.Non-zero dispersion operation wavelength minimum is 1460-1625nm, and abbe number is just (+) number, 2ps/nm.km≤Dmin≤D≤Dmax≤15ps/nm.km.Other optical fiber of CHROMATIC DISPERSION IN FIBER OPTICS slope ratio lower.
Based on above consideration, existing optical fiber all can not meet the demands.To accomplish the mean dispersion slope is reduced to 0.030ps/nm in design with in making
2.km below, preferably accomplish the mean dispersion slope is reduced to 0.010ps/nm
2.km following (this moment, the wavelength applications scope can be expanded to 1300nm-1700nm).Because all there are certain contradiction in chromatic dispersion gradient and crooked decay with useful area, often useful area can reduce when reducing chromatic dispersion gradient, also can reduce for reducing the crooked decay of 1625nm wavelength useful area, so must take into account the relation between several persons, make the optical fiber that designs and manufactures have gratifying optical property, under the prerequisite that guarantees chromatic dispersion gradient and crooked decay, preferably useful area can be accomplished 60 μ m
2About.In design be also noted that the reduction of PMD in making, the optical fiber structure of designing must internal stress and geometrical defect further reduce, the optical fiber each several part has identical as far as possible viscosity and expansion coefficient, has good physical dimension; On manufacturing process, deposit, the rod that contracts, wire drawing all has stricter requirement.Cutoff wavelength and welding decay also must be noted.
Because the manufacturing competition of optical fiber is more and more fierce, the RIP structure of designing must guarantee that when the technology normal fluctuation change of optical property is not obvious, to improve yield rate, reduces cost.At last, aspect manufacturing process, must boost productivity, single prefabricated stick drawn wire length is reached more than the 200km, guarantee the qualities such as homogeneity of optical fiber, further improve the economic benefit of this type optical fiber.
Current G.655 optical fiber and optical fiber involved in the present invention have certain similarity, but this type G.655 optical fiber or cutoff wavelength than S belt length; The zero-dispersion wavelength of optical fiber is with at S; Optical fiber is low excessively in the chromatic dispersion of S, C, a certain band of L, and bigger than normal in the bending decay of L band.The optical fiber that this patent relates to then cutoff wavelength is shorter than the S band; The zero-dispersion wavelength of optical fiber is at the S band or below the E band; Optical fiber is 1-13ps/nm.km in the chromatic dispersion of S, C, L band or E, S, C, L, U band, and also has good attenuation characteristic at the L band.Its chromatic dispersion characteristics are up to 165-400nm, in S, C, L triband mean dispersion slope≤0.010 in DWDM medium wavelength range of application.Because these these optical fiber of characteristics structurally have certain difference with optical fiber G.655.We design, and dispersion characteristics change more insensitive RIP parameter when the technology minor fluctuations.
The dispersion characteristics of quartz glass single-mode fiber are mainly by material dispersion with waveguide dispersion 2 parts are compound constitutes.Waveguide dispersion is very responsive for the change of waveguiding structure, suitably designs the RIP structure of optical fiber, can change the amplitude of waveguide dispersion, realizes non-zero dispersion displacement, and the zero-dispersion wavelength that reaches the optical fiber of being developed is displaced to less than 1460nm or 1360nm.Further, the optical fiber RIP of suitable design, increase the lower concave ring of 2 low-refractions outside fibre core, increase with its degree of depth and width, slope reduces gradually and increases gradually, there is an optimum value, can also change the slope that waveguide dispersion increases with wavelength, thereby total the chromatic dispersion gradient that changes, chromatic dispersion gradient total in S, C, L-band or E, S, C, L, the about 160-400nm scope of U wave band reduces, realize that chromatic dispersion gradient is zero substantially, to keep the non-zero dispersion of 1-13ps/nm.km.
For useful area, also can be by outer 2 lower concave rings of fibre core and outer core adjustment, useful area is except that influential to chromatic dispersion and slope, their adjustment also has obvious influence for little curved decay, because there is proportional relation in useful area and long wavelength's little curved decay, must select reasonably design, guarantee that long wavelength's fade performance still keeps good under the situation of certain useful area.Cutoff wavelength is mainly adjusted by outer core and core design.
The present invention utilizes the theory relation of optical fiber RIP parameter and fibre-optical dispersion characteristic, sets up the appropriate mathematical model, utilizes this mathematical model to carry out computer simulation, at re-set target, obtains optimal optical fiber radial refractive index section (RIP) parameter.Then, the parameter pilot sample that utilizes superior PCVD, MCVD and OVD technology to obtain according to computer simulation according to the test to sample characteristics of for example, is set up actual optical fiber fabrication technology.According to the test optical fiber result of reality, carry out the system transmissions computer simulation experiment more at last, further adjust mentality of designing and process route, form a closed loop like this, develop ripe optical fiber at last according to the transmission experiment result.The RIP parameter that we now utilize design software to design has had new improvement, has increased the lower concave ring of 2 low-refractions outside fibre core, has taken into account chromatic dispersion, useful area, cutoff wavelength, indexs such as crooked decay.This is a kind of single-mode fiber of new generation; The continuous 3 wave band non-zero dispersions of S-C-L, optical fiber designs and manufacturing technology that chromatic dispersion gradient is very little be can be implemented in, and E wave band and U wave band the chromatic dispersion range of application can be extended to; The dispersion management cost of optical fiber link is dropped to minimum; Have new optimized cutoff wavelength, useful area, crooked decay; Be unique optical fiber that can carry out CWDM, DWDM application at continuous 3 wave bands of S-C-L.
Evident characteristic of the present invention is to have covered the first refractive index lower concave ring and the second refractive index lower concave ring on fibre core, the refractive index height of the refractive index ratio first refractive index lower concave ring of the second refractive index lower concave ring.These two refractive index lower concave rings have tangible regulating action for chromatic dispersion, chromatic dispersion gradient, useful area, and cutoff wavelength is had the fine setting effect, and can make the above-mentioned parameter of optical fiber reach optimization comprehensively to prepare.And fibre core of the present invention (1), the first refractive index lower concave ring (2), the second refractive index lower concave ring (3), outer core (4), inner cladding (5) adopt MCVD or PCVD method to realize, because these two rings can adopt independent parameter adjustment separately, can make control accuracy higher, the preform of being made is planted in test and has been increased reference coordinate, and technology controlling and process and realization are more accurately easily gone.The present invention not only can satisfy S-C-L triband transmission requirement, can also be used for the novel single-mode fiber of E-S-C-L-U five band transmission.This optical fiber has bigger positive dispersion value at the 1460-1625nm wave band than existing G.655 sonet standard, and the slope of chromatic dispersion is lower.This bigger dispersion values can more effectively suppress nonlinear effects such as caused four-wave mixing in dense wave division multipurpose (DWDM) system, cross-phase modulation.This optical fiber has exceeded the wavelength coverage of existing G.655 sonet standard regulation, and this optical fiber has bigger positive dispersion value at S, C, three wave bands of L, can realize wavelength-division multiplex at S, C, three wave bands of L or E, S, C, L, U five wave bands, satisfy recent systems development and application demand.
Fibre core of the present invention (1), the first refractive index lower concave ring (2), the second refractive index lower concave ring (3), outer core (4), inner cladding (5) are the synthetic layer of the full quartz that adopts existing P CVD method or MCVD method deposition, the synthetic quartz layer that substrate tube (6), surrounding layer (7) part are made for existing OVD method.
Description of drawings Fig. 1 is that refractive index profile schematic diagram Fig. 2 of the present invention is that dispersion characteristics schematic diagram Fig. 3 of the present invention is that mode field diameter of the present invention and effective area schematic diagram Fig. 4 are that refractive index profile schematic diagram Fig. 6 that bending loss characteristics schematic diagram Fig. 5 of the present invention is another embodiment of the present invention is that dispersion characteristics schematic diagram Fig. 7 of another embodiment of the present invention is that the mode field diameter of another embodiment of the present invention and bending loss characteristics schematic 1 that effective area schematic diagram Fig. 8 is another embodiment of the present invention are the cutoff wavelength adjustment result of the 3rd embodiment of optical fiber of the present invention
Embodiment
Below in conjunction with accompanying drawing the present invention will be described in more detail the present invention:
As shown in Figure 1, optical fiber of the present invention comprises fibre core and covering, on fibre core (1), be coated with the first refractive index lower concave ring (2), on the first refractive index lower concave ring (2), be coated with the second refractive index lower concave ring (3), core (4) outside the second refractive index lower concave ring (3) is gone up covering, core (4) is gone up and is covered inner cladding (5) outside, goes up at inner cladding (5) and covers surrounding layer (7).In the present embodiment, the first refractive index lower concave ring width d1 is 1.55 μ m, and the second refractive index lower concave ring width d2 is 1.3 μ m; Absolute index of refraction n1, the n2 of the first refractive index lower concave ring and the second refractive index lower concave ring are respectively 1.45 and 1.452.
Wherein:
The 3rd part is the second refractive index lower concave ring, is of a size of 1.3 μ m, and refractive index is 1.452.
The 4th part is outer core, is of a size of 4.4 μ m, and refractive index is 1.46.
The 5th part is the optical fiber inner cladding, is of a size of 5 μ m, and refractive index is 1.456.
The 6th part is a substrate tube, is of a size of 10 μ m, and refractive index is 1.457.
The 7th part is a surrounding layer, is of a size of 36.65 μ m, and refractive index is 1.457.
1st, 2,3,4,5 parts are the synthetic layer of full quartz of PCVD method or MCVD method deposition, the synthetic quartz layer that the 6th, 7 parts are made for the OVD method.
In the optical fiber of this embodiment, total dispersion is that maximum chromatic dispersion gradient is less than 0.01ps/nm2.km between 5.53～6.24ps/nm.km in 1460～1625nm scope.In the wideer wavelength coverage internal dispersion that surpasses 1360～1675nm also between 1～13ps/nm.km.As shown in Figure 2.
In the optical fiber of this embodiment, the mode field diameter at 1550nm place is 8.5 μ m, useful area 57.5.As shown in Figure 3.
In the optical fiber of this embodiment, macrobending loss approaches 0, and microbending loss is 0.0037dB/km.As shown in Figure 4.
As Fig. 5 is an alternative embodiment of the invention, this optical fiber covers the first refractive index lower concave ring (2) at fibre core (1), go up the covering second refractive index lower concave ring (3) at the first refractive index lower concave ring (2), core (4) outside the second refractive index lower concave ring (3) is gone up covering, the last inner cladding (5) that covers of core (4) is made at inner cladding (5) last covering surrounding layer (7) outside.The first refractive index lower concave ring width d1 is 1.55 μ m, and the second refractive index lower concave ring width d2 is 1.35 μ m.Absolute index of refraction n1, the n2 of the first refractive index lower concave ring and the second refractive index lower concave ring are respectively 1.453 and 1.455.Wherein part 1 is a fibre core, and radius is 3.6 μ m, and refractive index is 1.4643.
The 3rd part is the second refractive index lower concave ring, is of a size of 1.3 μ m, and refractive index is 1.455.
The 4th part is outer core, is of a size of 4.4 μ m, and refractive index is 1.46.
The 5th part is the optical fiber inner cladding, is of a size of 5 μ m, and refractive index is 1.456.
The 6th part is a substrate tube, is of a size of 10 μ m, and refractive index is 1.457.
The 7th part is a surrounding layer, is of a size of 36.65 μ m, and refractive index is 1.457.
1st, 2,3,4,5 parts also are the synthetic layer of full quartz of PCVD method or MCVD method deposition, the synthetic quartz layer that the 6th, 7 parts are also made for the OVD method.
In the optical fiber of this embodiment, total dispersion is that maximum chromatic dispersion gradient is less than 0.029ps/nm2.km between 2.70～7.56ps/nm.km in 1460～1625nm scope.As shown in Figure 6.
In the optical fiber of this embodiment, the mode field diameter at 1550nm place is 8.33 μ m, useful area 54.5.As shown in Figure 7.
In the optical fiber of this embodiment, macrobending loss approaches 0, and microbending loss is 0.0046dB/km.As shown in Figure 8.
As table 1 is the 3rd embodiment.Other parameter of optical fiber is identical with the optical fiber parameter of second embodiment in this embodiment, but the refractive index of the first refractive index lower concave ring (2) and the second refractive index lower concave ring (3) and the size and the refractive index of outer core are finely tuned.Can find that from this table the fine setting of the refractive index of the first refractive index lower concave ring and the second refractive index lower concave ring produces fine setting to cutoff wavelength, and the fine setting meeting of the size of outer core and refractive index causes bigger influence to cutoff wavelength.
| The first refractive index lower concave ring | The second refractive index lower concave ring | Outer core size | Outer core refractive index | Cutoff wavelength |
| ?1.451 | ?1.453 | ?4.4 | ?1.46 | ?1.31 |
| ?1.452 | ?1.454 | ?4.4 | ?1.46 | ?1.35 |
| ?1.451 | ?1.453 | ?4.6 | ?1.46 | ?1.35 |
| ?1.451 | ?1.453 | ?4.8 | ?1.46 | ?1.40 |
| ?1.451 | ?1.453 | ?5.0 | ?1.46 | ?1.44 |
| ?1.451 | ?1.453 | ?4.4 | ?1.4603 | ?1.41 |
Table 1
The present invention also has many embodiments, under other structure of optical fiber situation same as the previously described embodiments, the first refractive index lower concave ring width d1 can elect 1.0 μ m, 2.0 μ m, 0.5 μ m, 2.5 μ m as, and the second refractive index lower concave ring width d2 also can elect 1.0 μ m, 2.0 μ m, 0.5 μ m, 2.5 μ m as.
Claims (9)
1, a kind of novel low dispersion fiber, it comprises fibre core and covering, it is characterized in that: on fibre core (1), be coated with the first refractive index lower concave ring (2), on the first refractive index lower concave ring (2), be coated with the second refractive index lower concave ring (3), core (4) outside the second refractive index lower concave ring (3) is gone up covering, core (4) is gone up and is covered inner cladding (5) outside, goes up at inner cladding (5) and covers surrounding layer (7).
2, according to a kind of novel low dispersion fiber of claim 1, it is characterized in that: the first refractive index lower concave ring width d1 scope is: 0.5 μ m≤d1≤2.5 μ m, the second refractive index lower concave ring width d2 scope is 0.5 μ m≤d2≤2.5 μ m.
3, according to a kind of novel low dispersion fiber of claim 1 or 2, it is characterized in that: absolute index of refraction n1, the n2 of the first refractive index lower concave ring and the second refractive index lower concave ring satisfies 1.447≤n1≤1.456 and 1.448%≤n2≤1.457 respectively.
4, according to a kind of novel low dispersion fiber of claim 1 or 2, it is characterized in that: additive Si has mixed in the first refractive index lower concave ring (2) and the second refractive index lower concave ring (3)
2F
6Or C
2F
6, its doping is respectively 0.15%～0.9% and 0～0.75%.
5, according to a kind of novel low dispersion fiber of claim 1 or 2, it is characterized in that: in 1625 nanometer wavelength range, do not have zero-dispersion wavelength in 1460 nanometers.
6, according to a kind of novel low dispersion fiber of claim 5, it is characterized in that: 1460 nanometers to 1625 nanometer wavelength range internal dispersions between 2～8ps/nm.km, chromatic dispersion gradient is not more than 0.03ps/nm
2.km.
7, according to a kind of novel low dispersion fiber of claim 5, it is characterized in that: its cutoff wavelength is not more than 1450nm.
8, according to a kind of novel low dispersion fiber of claim 1 or 2, it is characterized in that: in 1360 nanometers in 1675 nanometer wavelength range, chromatic dispersion at 1ps/nm.km between the 13ps/nm.km.
9, a kind of novel low dispersion fiber according to Claim 8, it is characterized in that: its cutoff wavelength is not more than 1350nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031190677A CN1211676C (en) | 2003-05-14 | 2003-05-14 | New type chromatic dispersion optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031190677A CN1211676C (en) | 2003-05-14 | 2003-05-14 | New type chromatic dispersion optical fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1479121A true CN1479121A (en) | 2004-03-03 |
| CN1211676C CN1211676C (en) | 2005-07-20 |
Family
ID=34152773
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031190677A Expired - Lifetime CN1211676C (en) | 2003-05-14 | 2003-05-14 | New type chromatic dispersion optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1211676C (en) |
-
2003
- 2003-05-14 CN CNB031190677A patent/CN1211676C/en not_active Expired - Lifetime
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| CN1211676C (en) | 2005-07-20 |
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Effective date of registration: 20161214 Address after: 430074 Wuhan, Hongshan Province District Road, Department of mail, No. 88 hospital Patentee after: FIBERHOME TELECOMMUNICATION TECHNOLOGIES Co.,Ltd. Patentee after: FIBERHOME FUJIKURA OPTIC TECHNOLOGY Co.,Ltd. Address before: Department of Fiberhome technology 430074 Hubei province Wuhan city Hongshan District YouKeYuan Road No. 88 Patentee before: FIBERHOME TELECOMMUNICATION TECHNOLOGIES Co.,Ltd. |
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Granted publication date: 20050720 |