CN102768383A - Single mode fiber with large effective area - Google Patents
Single mode fiber with large effective area Download PDFInfo
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- CN102768383A CN102768383A CN2012102694658A CN201210269465A CN102768383A CN 102768383 A CN102768383 A CN 102768383A CN 2012102694658 A CN2012102694658 A CN 2012102694658A CN 201210269465 A CN201210269465 A CN 201210269465A CN 102768383 A CN102768383 A CN 102768383A
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- optical fiber
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- large effective
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Abstract
The invention relates to a single mode fiber provided with large effective area and used for optical transmission line. The single mode fiber comprises a fiber core layer and an outer cladding and is characterized in that the outside of the fiber core layer is cladded with a middle cladding layer, the outside of the middle cladding layer is provided with a sunken cladding layer; the radius r1 of the fiber core layer is 5um to 8um, and the relative refractive index difference of the fiber core layer is 0.19% to 0.28%; the single-side radial width of the middle cladding layer is 2.5um-5um, and the relative refractive index difference of the middle cladding layer is -0.15% to 0.15%; the single-side radial width of the sunken cladding layer is 1.5um-3.5um, and the relative refractive index difference of the sunken cladding layer is -0.15% to -0.4%. According to the single mode fiber, through the reasonable design of all fiber core layer profiles of the optical fiber, the optical fiber has an effective area equal to or larger than 110 um2, and the non-linear effect in the transmission optical fiber can be effectively reduced. The complex performance parameters, such as cutoff wavelength, bending loss, chromatic dispersion and the like, are good in the application waveband; and the production cost of the optical fiber is effectively reduced by reasonably controlling the outer diameter size of the optical fiber settled layer, thereby achieving better balance on the optical fiber production cost and the optical fiber performance parameter.
Description
Technical field
The present invention relates to the Optical Fiber Transmission field, concrete relate to a kind of single-mode fiber that is used for optical transmission line with large effective area.
Background technology
Along with the continuous development of optical fiber transmission technique, the exploitation of Erbium-Doped Fiber Amplifier (EDFA) (EDFA) and wavelength-division multiplex technique (WDM) technology were applied in the mid-90.In the WDM device systems,, often adopt EDFA to amplify compensation owing to use the insertion loss of wave multiplexer, channel-splitting filter bigger.But, when amplifying luminous power, the nonlinear effect in the optical fiber is increased greatly.The optical nonlinear effect comprises four-wave mixing, from phase modulation (PM) and cross-phase modulation etc., this effect limits the capacity and the distance of light transmission.So, in the transmission system of high capacity, two-forty,, can reach the purpose of reduction nonlinear effect through the improvement of optical fiber property for the demands for higher performance of Transmission Fibers.
When adopting the high power density system, nonlinear factor is to be used to assess the good and bad parameter of system performance that nonlinear effect causes, and it is defined as n2/A
EffWherein, n2 is the nonlinear refraction index of Transmission Fibers, A
EffIt is the useful area of Transmission Fibers.Increase the useful area of Transmission Fibers, can reduce the nonlinear effect in the optical fiber.
At present, be used for the general single mode fiber of land transmission system circuit, the only about 80um of its useful area
2About.And in the long haul transmission system of land, higher to the useful area requirement of optical fiber, general useful area is at 100um
2More than.In order to reduce the laying cost, reduce the use of repeater as much as possible, in non-relay transmission system, like undersea transmission system, the useful area of Transmission Fibers is preferably in 130um
2More than.Yet at present in the design of the refractive index profile of large effective area fiber, the diameter that often is used for the optics sandwich layer of transmitting optical signal through increase obtains big useful area.Such scheme exists the certain designed difficult point.On the one hand; The sandwich layer of optical fiber and near its key property of covering major decision optical fiber; And in the cost of optical fiber manufacturing, occupy bigger proportion, if the radial dimension of design is excessive, will inevitably improve the manufacturing cost of optical fiber; Raise the optical fiber price, will become the obstacle of this type optical fiber widespread usage.On the other hand, compare general single mode fiber, the increase of optical fiber effective area, the deterioration that can bring some other parameter of optical fiber: such as, fiber cut off wavelength can increase, and is difficult to guarantee the single mode state of optical fiber light signal in the transmission wave band if cutoff wavelength is excessive; In addition, improper if the optical fibre refractivity section designs, also can cause bending property, the isoparametric deterioration of chromatic dispersion.
Outside the core/covering of fibre profile near light transmission, it also is a kind of common means of improving the fibre-optical bending performance that deposition has the sagging covering of darker what is called of mixing.As, U.S. patent of invention US 4,852,968 has proposed a kind of optical fibre refractivity cross-section structure with one or more sagging coverings, and has described the influence of this structure to optical parametrics such as zero-dispersion wavelength of fiber, chromatic dispersions.But the document is not mentioned the influence of this structure for cutoff wavelength.Perhaps be design undesirable of optical fibre refractivity section, this invention does not obtain gratifying large effective area.Lift among the embodiment in this invention, the maximum spot size that is mentioned to is merely 4.69um, infers that with this value its optical fiber effective area should be at 80um
2In.
Document CN101281275 B has also proposed a kind of optical fiber that has the covering that sink, and the useful area of its optical fiber can reach 120 um
2More than, and its bend loss properties has obtained control preferably.But, the sagging covering external diameter r of the embodiment that it is cited
3Minimum is 14.3um, and useful area with this understanding has only 125um
2Among other embodiment that this invention is enumerated, when effective area rises to 130 um
2After above, its r
3Increase to more than 15.5 um.This trend is illustrated in the scheme of this invention proposition, if obtain big relatively useful area, can bring bigger sagging covering external diameter, can cause the raising of optical fiber manufacturing cost like this.
Document CN10232392 A has described a kind of more optical fiber of large effective area that has.Though this useful area of inventing said optical fiber has reached 150 um
2More than, but realize through the performance index of having sacrificed cutoff wavelength.It allows cable cut-off wavelength more than 1450nm, in its said embodiment, and stranding cutoff wavelength even reached more than the 1800nm.In the middle of practical application, too high cutoff wavelength is difficult to guarantee that optical fiber is ended in application band, can't guarantee that just light signal is the single mode state when transmission.Therefore, this type optical fiber possibly face a series of practical problemss in application.In addition, this is invented among the cited embodiment, and covering external diameter r sink
3Minimum is 16.3um, and is bigger than normal equally to some extent.This invention do not have can optical fiber parameter (as, useful area, cutoff wavelength etc.) and the optical fiber manufacturing cost in obtain optimum combination.
Below be the definition and the explanation of some terms of relating among the present invention:
Refractive index contrast refringence
:
Begin to count from the fiber core axis, according to change of refractive, that layer that is defined as near axis is core layer, and the outermost layer of optical fiber is that the pure silicon dioxide layer is defined as optical fiber jacket.From the core layer to the optical fiber jacket, be followed successively by the first fibre core layering, the second fibre core layering, by that analogy.
Each layer of optical fiber relative index of refraction
defined by following equation
Wherein
is the refractive index of fibre core; And
is cladding index, i.e. the refractive index of pure silicon dioxide.
The useful area A of optical fiber
Eff:
Wherein, E is and propagates relevant electric field that r is that the distance between the Electric Field Distribution point is arrived in the axle center.
Cable cut-off wavelength λ
Cc:
Define among IEC (International Electrotechnical Commission) the standard 60793-1-44: cable cut-off wavelength λ
CcIt is the wavelength of no longer propagating light signal has been propagated 22 meters in optical fiber after as single mode signal.When test, need pass through the circle of optical fiber around a radius 14cm, the circle of two radius 4cm obtains data.
Summary of the invention
Technical matters to be solved by this invention is intended to design a kind of optical fiber with large effective area of low optical fiber manufacturing cost, and its stranding cutoff wavelength is less than 1530nm, and has bending loss, dispersion preferably.
The present invention for the technical scheme that problem adopted of the above-mentioned proposition of solution is: comprise core layer and surrounding layer, it is characterized in that outside core layer, coating the tundish layer, middle covering peripheral hardware deposits sunken covering; Described core layer radius r
1Be 5um ~ 8um, refractive index contrast
Be 0.19% ~ 0.28%; Monolateral radial width (the r of covering in the middle of described
2-r
1) be 2.5um ~ 5um, refractive index contrast
Be-0.15% ~ 0.15%; Monolateral radial width (the r of described sagging covering
3-r
2) be 1.5um ~ 3.5um, refractive index contrast
Scope is-1.5% ~-0.4%.
Press such scheme, described surrounding layer is the pure silicon dioxide layer.
Press such scheme, described core layer radius r
1Be 5.5um ~ 7.5um.
Press such scheme, the monolateral radial width (r of described middle covering
2-r
1) be 2.5um ~ 4.5um, refractive index contrast
Be-0.10% ~ 0.15%.
Press such scheme, said optical fiber is 110um at the useful area of 1550nm wavelength
2~ 130um
2, or be 130um
2~ 160um
2
Press such scheme, the stranding cutoff wavelength of said optical fiber is equal to or less than 1530nm.
Press such scheme, said optical fiber is equal to or less than 22ps/nm*km in the chromatic dispersion at wavelength 1550nm place, and the chromatic dispersion gradient at wavelength 1550nm place is equal to or less than 0.070ps/nm
2* km.
Press such scheme, said optical fiber is equal to or less than 0.185dB/km in the attenuation at wavelength 1550nm place.
Press such scheme, said optical fiber is the bending radius for 30 mm at wavelength 1625nm place, and bending loss is equal to or less than 0.05dB.
Press such scheme, said uncoated bare fibre external diameter is 125um, and applying back optical fiber external diameter is 245um.
Beneficial effect of the present invention is: 1, through the appropriate design to each core layer section of optical fiber, make optical fiber have the 110um of being equal to or greater than
2Useful area, under preferable parameter area, can reach and be equal to or greater than 130um
2, even greater than 150um
2Useful area.Bigger optical fiber effective area can effectively reduce the nonlinear effect in the Transmission Fibers.2, combination property parameters such as cutoff wavelength of the present invention, bending loss, chromatic dispersion are good at application band; Enough little stranding cutoff wavelength; To guarantee the single mode state of this type optical fiber light signal in the C-band transmission is used; The cladding structure that sink has improved action preferably to the bending loss of optical fiber.3, rationally controlled the outside dimension of optical fiber sedimentary deposit, thereby effectively reduced the manufacturing cost of optical fiber, especially, aspect optical fiber manufacturing cost and the optical fiber property parameter two balance has preferably been arranged through the external diameter of the sagging covering of appropriate design optical fiber.Optical fiber of the present invention is applicable to high speed, jumbo long haul transmission system and the non-relay transmission system of long distance.
Description of drawings
The refractive index profile structure distribution figure of Fig. 1 one embodiment of the invention.
Embodiment
Be described in detail below in conjunction with embodiment.
Comprise core layer and surrounding layer, covering and sagging covering in the middle of between core layer and surrounding layer, setting gradually from the inside to the outside; Described surrounding layer is the pure silicon dioxide layer.
Table one is classified the refractive index profile parameter of the preferred embodiment of the invention as.Table two is the pairing light-transfer characteristic of the said optical fiber of table one.
The fibre profile parameter of table one, the embodiment of the invention
The optical fiber parameter of table two, the embodiment of the invention
Wherein, MFD is the mode field diameter of optical fiber at the 1550nm wavelength, A
EffBe the useful area of optical fiber at the 1550nm wavelength, λ
CcBe the cutoff wavelength of optical cable, D is the dispersion values in the 1550nm wavelength, D
SBe the chromatic dispersion gradient of 1550nm wavelength, Att is the attenuation value at the 1550nm place, and B is the macrobending loss (in the present invention, the macrobending loss of optical fiber be on the cylinder of radius 30mm around 100 enclose back measured additional attenuation) of optical fiber at the 1625nm place.
Claims (9)
1. the single-mode fiber with large effective area comprises core layer and surrounding layer, it is characterized in that outside core layer, coating the tundish layer, and middle covering peripheral hardware deposits sunken covering; Described core layer radius r
1Be 5um ~ 8um, refractive index contrast
Be 0.19% ~ 0.28%; Monolateral radial width (the r of covering in the middle of described
2-r
1) be 2.5um ~ 5um, refractive index contrast
Be-0.15% ~ 0.15%; Monolateral radial width (the r of described sagging covering
3-r
2) be 1.5um ~ 3.5um, refractive index contrast
Scope is-1.5% ~-0.4%.
2. by the described single-mode fiber of claim 1, it is characterized in that described surrounding layer is the pure silicon dioxide layer with large effective area.
3. by claim 1 or 2 described single-mode fibers, it is characterized in that described core layer radius r with large effective area
1Be 5.5um ~ 7.5um.
4. by claim 1 or 2 described single-mode fibers, it is characterized in that the monolateral radial width (r of described middle covering with large effective area
2-r
1) be 2.5um ~ 4.5um, refractive index contrast
Be-0.10% ~ 0.15%.
5. by claim 1 or 2 described single-mode fibers, it is characterized in that said optical fiber is 110um at the useful area of 1550nm wavelength with large effective area
2~ 130um
2, or be 130um
2~ 160um
2
6. by claim 1 or 2 described single-mode fibers, it is characterized in that the stranding cutoff wavelength of said optical fiber is equal to or less than 1530nm with large effective area.
7. by claim 1 or 2 described single-mode fibers with large effective area, it is characterized in that said optical fiber is equal to or less than 22ps/nm*km in the chromatic dispersion at wavelength 1550nm place, the chromatic dispersion gradient at wavelength 1550nm place is equal to or less than 0.070ps/nm
2* km.
8. by claim 1 or 2 described single-mode fibers, it is characterized in that said optical fiber is equal to or less than 0.185dB/km in the attenuation at wavelength 1550nm place with large effective area.
9. by claim 1 or 2 described single-mode fibers with large effective area, it is characterized in that said optical fiber at wavelength 1625nm place the bending radius for 30 mm, bending loss is equal to or less than 0.05dB.
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| CN2012102694658A CN102768383A (en) | 2012-08-01 | 2012-08-01 | Single mode fiber with large effective area |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103323908A (en) * | 2013-06-19 | 2013-09-25 | 长飞光纤光缆有限公司 | Single mode fiber and manufacturing method thereof |
| CN103995314A (en) * | 2014-06-13 | 2014-08-20 | 江苏七宝光电集团有限公司 | Bending insensitive single mode fiber and production technology thereof |
| CN104216044A (en) * | 2014-09-17 | 2014-12-17 | 长飞光纤光缆股份有限公司 | Low-attenuation bending insensitive single mode fiber |
| US20160216442A1 (en) * | 2013-04-15 | 2016-07-28 | Corning Incorporated | Low diameter optical fiber |
| CN107678088A (en) * | 2017-11-09 | 2018-02-09 | 长飞光纤光缆股份有限公司 | The single-mode fiber of low attenuation large effective area |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101281275B (en) * | 2007-04-06 | 2011-07-06 | 德雷卡通信技术公司 | Transmission optical fiber having large effective area |
| CN102313924A (en) * | 2010-07-02 | 2012-01-11 | 德拉克通信科技公司 | Single-mode fiber and optical system |
-
2012
- 2012-08-01 CN CN2012102694658A patent/CN102768383A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101281275B (en) * | 2007-04-06 | 2011-07-06 | 德雷卡通信技术公司 | Transmission optical fiber having large effective area |
| CN102313924A (en) * | 2010-07-02 | 2012-01-11 | 德拉克通信科技公司 | Single-mode fiber and optical system |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160216442A1 (en) * | 2013-04-15 | 2016-07-28 | Corning Incorporated | Low diameter optical fiber |
| US9995874B2 (en) * | 2013-04-15 | 2018-06-12 | Corning Incorporated | Low diameter optical fiber |
| US11009656B2 (en) | 2013-04-15 | 2021-05-18 | Corning Incorporated | Low diameter optical fiber |
| US11009655B2 (en) | 2013-04-15 | 2021-05-18 | Corning Incorporated | Low diameter optical fiber |
| US11150403B2 (en) | 2013-04-15 | 2021-10-19 | Corning Incorporated | Low diameter optical fiber |
| CN103323908A (en) * | 2013-06-19 | 2013-09-25 | 长飞光纤光缆有限公司 | Single mode fiber and manufacturing method thereof |
| CN103323908B (en) * | 2013-06-19 | 2015-07-01 | 长飞光纤光缆股份有限公司 | Single mode fiber and manufacturing method thereof |
| CN103995314A (en) * | 2014-06-13 | 2014-08-20 | 江苏七宝光电集团有限公司 | Bending insensitive single mode fiber and production technology thereof |
| CN104216044A (en) * | 2014-09-17 | 2014-12-17 | 长飞光纤光缆股份有限公司 | Low-attenuation bending insensitive single mode fiber |
| CN104216044B (en) * | 2014-09-17 | 2017-10-24 | 长飞光纤光缆股份有限公司 | A kind of low attenuation bend-insensitive single-mode optical fiber |
| CN107678088A (en) * | 2017-11-09 | 2018-02-09 | 长飞光纤光缆股份有限公司 | The single-mode fiber of low attenuation large effective area |
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Address after: 430073 Hubei city of Wuhan province Wuchang two Guanshan Road No. four Applicant after: Yangtze Optical Fibre and Cable Co., Ltd Address before: 430073 Hubei city of Wuhan province Wuchang two Guanshan Road No. four Applicant before: Changfei Fibre-Optical & Optical Cable Co., Ltd. |
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Application publication date: 20121107 |