WO2021187475A1 - 光ファイバ - Google Patents
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- WO2021187475A1 WO2021187475A1 PCT/JP2021/010590 JP2021010590W WO2021187475A1 WO 2021187475 A1 WO2021187475 A1 WO 2021187475A1 JP 2021010590 W JP2021010590 W JP 2021010590W WO 2021187475 A1 WO2021187475 A1 WO 2021187475A1
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- refractive index
- optical fiber
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- specific refractive
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
- G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
- G02B6/03638—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 3 layers only
- G02B6/03655—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 - + +
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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
- G02B6/028—Optical fibres with cladding with or without a coating with core or cladding having graded refractive index
- G02B6/0283—Graded index region external to the central core segment, e.g. sloping layer or triangular or trapezoidal layer
- G02B6/0285—Graded index layer adjacent to the central core segment and ending at the outer cladding index
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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
- G02B6/028—Optical fibres with cladding with or without a coating with core or cladding having graded refractive index
-
- 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
- G02B6/0283—Graded index region external to the central core segment, e.g. sloping layer or triangular or trapezoidal layer
-
- 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
-
- 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
- G02B6/03622—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 2 layers only
Definitions
- ITU-T International Telecommunication Union Telecommunication Standardization Sector
- ITU-T G International Telecommunication Union Telecommunication Standardization Sector
- FTTx Fiber To The x
- ITU-T G. 657 A1 the upper limit of bending loss at bending radii of 10 mm and 15 mm is specified.
- ITU-T G. 657 A2 defines the upper limit of bending loss at bending radii of 7.5 mm, 10 mm and 15 mm.
- Patent Document 1 discloses a method of adding chlorine (Cl) to the outer clad portion as one of the methods for realizing the depressed structure.
- Patent Document 2 discloses a method of improving bending resistance by setting a refractive index distribution such that the refractive index gradually decreases from the core to the clad at the boundary between the core and the clad.
- the optical fiber according to the embodiment of the present disclosure includes a core, an inner clad surrounding the core, and an outer clad surrounding the inner clad.
- the average specific refractive index difference ⁇ 1 of the core with respect to pure silica, the average specific refractive index difference ⁇ 2 of the inner clad with respect to pure silica, and the average specific refractive index difference ⁇ 3 of the outer clad with respect to pure silica satisfy the relationship of ⁇ 1> ⁇ 3 ⁇ ⁇ 2. ..
- the ratio r2 / r1 of the inner clad radius r2 to the core radius r1 is 4.5 or more and 5.5 or less.
- the minimum value ⁇ min of the difference in specific refractive index with respect to pure silica is ⁇ 0.030% or more and ⁇ 0.010% or less.
- the radius rmin at which the difference in the specific refractive index is the minimum value ⁇ min is r1 ⁇ rmin ⁇ r2.
- the difference in the specific refractive index at the core radius r1 is ⁇ (r1), ( ⁇ min ⁇ (r1)) / (rmin ⁇ r1) is ⁇ 0.002% / ⁇ m or less.
- FIG. 1 is a diagram showing a cross section and a refractive index distribution of the optical fiber according to the embodiment.
- FIG. 2 is a graph showing the relationship between the first slope of the specific refractive index difference and the bending loss.
- FIG. 3 is a graph showing the relationship between the second slope of the specific refractive index difference and the bending loss.
- FIG. 4 is a graph showing the relationship between the ratio of the inner clad radius to the core radius and the transmission loss.
- Patent Document 2 The method described in Patent Document 2 is substantially equivalent to increasing the core diameter, and the overlap between the light power distribution and the dopant becomes large. Therefore, the transmission loss is exacerbated.
- optical fiber capable of achieving both low bending loss and low transmission loss.
- the optical fiber according to one embodiment includes a core, an inner clad that surrounds the core, and an outer clad that surrounds the inner clad.
- the average specific refractive index difference ⁇ 1 of the core with respect to pure silica, the average specific refractive index difference ⁇ 2 of the inner clad with respect to pure silica, and the average specific refractive index difference ⁇ 3 of the outer clad with respect to pure silica satisfy the relationship of ⁇ 1> ⁇ 3 ⁇ ⁇ 2. ..
- the ratio r2 / r1 of the inner clad radius r2 to the core radius r1 is 4.5 or more and 5.5 or less.
- the minimum value ⁇ min of the difference in specific refractive index with respect to pure silica is ⁇ 0.030% or more and ⁇ 0.010% or less.
- the radius rmin at which the difference in the specific refractive index is the minimum value ⁇ min is r1 ⁇ rmin ⁇ r2.
- the difference in the specific refractive index at the core radius r1 is ⁇ (r1)
- ( ⁇ min ⁇ (r1)) / (rmin ⁇ r1) is ⁇ 0.002% / ⁇ m or less.
- a value obtained by moving and averaging the measured values of the refractive index at each radius in a 0.5 ⁇ m section can be used, for example.
- the optical fiber according to the above embodiment since ⁇ 1> ⁇ 3 ⁇ ⁇ 2, it is possible to provide a difference in the specific refractive index between the core and the inner clad. Since the ratio r2 / r1 is 4.5 or more, transmission loss can be suppressed. When the ratio r2 / r1 is 5.5 or less, bending loss can be suppressed. Since the slope of the refractive index distribution (hereinafter referred to as "first slope") ( ⁇ min- ⁇ (r1)) / (rmin-r1) is -0.002% / ⁇ m or less, bending loss can be suppressed. can. Therefore, both low bending loss and low transmission loss can be achieved at the same time.
- first slope ⁇ min- ⁇ (r1)
- the slope (hereinafter referred to as “second slope”) ⁇ min / (rmin-r0) is ⁇ 0.002. It may be% / ⁇ m or less.
- the average specific refractive index difference ⁇ 2 may be ⁇ 0.025% or more and ⁇ 0.010% or less. In this case, it is easy to increase the difference in the specific refractive index between the core and the inner clad.
- the average concentration of chlorine in the outer clad may be 500 wtppm or less. In this case, foaming caused by Cl can be suppressed.
- the average specific refractive index difference ⁇ 1 may be 0.35% or more and 0.45% or less. In this case, it is easy to increase the difference in the specific refractive index between the core and the inner clad.
- the radius rmin may be 7 ⁇ m or more and 15 ⁇ m or less. In this case, both low bending loss and low transmission loss are likely to be compatible.
- the core radius r1 may be 4 ⁇ m or more and 5 ⁇ m or less.
- the first slope ( ⁇ min- ⁇ (r1)) / (rmin-r1) or the second slope ⁇ min / (rmin-r0) tends to be ⁇ 0.002% / ⁇ m or less.
- the depressed structure has a problem that the transmission loss is deteriorated due to a large amount of dopant added to the core and the inner cladding. Further, according to the experience and examination of the present inventors, in the method disclosed in Patent Document 1, bubbles may be generated due to Cl. Therefore, there is also a problem that productivity is significantly impaired.
- FIG. 1 is a diagram showing a cross section and a refractive index distribution of the optical fiber according to the embodiment.
- the optical fiber 1 of the present embodiment includes a core 10 and a clad 20 surrounding the core 10.
- the cross-sectional view of FIG. 1 shows a cross section perpendicular to the central axis C of the optical fiber 1.
- the horizontal axis is the radial position of the optical fiber 1
- the vertical axis is the difference in the specific refractive index of the optical fiber 1 with respect to pure silica (SiO 2).
- the core 10 is made of silica glass containing Ge.
- the clad 20 has an inner clad 21 that surrounds the core 10 and an outer clad 22 that surrounds the inner clad 21.
- the inner clad 21 is made of silica glass containing fluorine (F).
- the outer clad 22 is made of silica glass that is substantially free of dopants.
- the average concentration of chlorine (Cl) in the outer clad 22 is 500 wtppm or less in terms of mass fraction.
- the outer diameter (diameter) of the clad 20 is equal to the outer diameter (diameter) of the outer clad 22, for example, 124 ⁇ m or more and 126 m or less.
- the radius of the core 10, that is, the core radius r1 is, for example, 4 ⁇ m or more and 5 ⁇ m or less.
- the radius of the inner clad 21, that is, the inner clad radius r2 is, for example, 18 ⁇ m or more and 28 ⁇ m or less.
- the average specific refractive index difference ⁇ 1 of the core 10 with respect to pure silica, the average specific refractive index difference ⁇ 2 of the inner clad 21 with respect to pure silica, and the average specific refractive index difference ⁇ 3 of the outer clad 22 with respect to pure silica are ⁇ 1> ⁇ 3 ⁇ ⁇ 2. Meet the relationship. The relationship of ⁇ 1> ⁇ 3> ⁇ 2 may be satisfied.
- the average specific refractive index difference ⁇ 1 is, for example, 0.35% or more and 0.45% or less.
- the average specific refractive index difference ⁇ 2 is, for example, ⁇ 0.025% or more and ⁇ 0.010% or less.
- the average specific refractive index difference ⁇ 3 is, for example, ⁇ 0.015% or more and 0.035% or less, preferably ⁇ 0.010% or more and 0.010% or less, and more preferably ⁇ 0.005 or more and 0.005% or less. Is.
- the boundary between the core 10 and the inner clad 21 and the boundary between the inner clad 21 and the outer clad 22 are detected by measuring the refractive index distribution.
- the measurement result of the refractive index in the radial direction is differentiated with respect to the radial direction, the position where the differential value is equal to or less than a certain value is the boundary between the core 10 and the inner clad 21, and the position where the differential value is more than a certain value is the inner clad 21.
- the difference in the specific refractive index of the optical fiber 1 with respect to pure silica is the minimum value ⁇ min in the inner clad 21.
- the minimum value ⁇ min is ⁇ 0.030% or more and ⁇ 0.010% or less.
- the radius rmin at which the difference in the specific refractive index of the optical fiber 1 with respect to pure silica is the minimum value ⁇ min is, for example, 7 ⁇ m or more and 15 ⁇ m or less. Further, r1 ⁇ rmin ⁇ r2.
- GeO 2 is used as an up-dopant in order to increase ⁇ 1
- F is used as a down-dopant in order to decrease ⁇ 2.
- the increase in Rayleigh scattering loss results in an increase in transmission loss.
- the F concentration is lowered in the inner portion (near the core 10) of the depressed (inner clad 21).
- the refractive index distribution has a slope as shown in FIG. 1 due to the low F concentration.
- FIG. 2 is a graph showing the relationship between the first slope of the specific refractive index difference and the bending loss.
- the horizontal axis is the first inclination (Slope 1)
- the vertical axis is the bending loss.
- the first slope is the slope of the refractive index distribution in the vicinity of the core 10 of the inner clad 21, and is specifically defined as the slope of the refractive index distribution whose radius (radial position) is between r1 and rmin. Will be done. That is, when the difference in the specific refractive index of the optical fiber 1 with respect to pure silica in the core radius r1 is ⁇ (r1), the first inclination is indicated by ( ⁇ min ⁇ (r1)) / (rmin ⁇ r1). Further, the bending loss here indicates the amount of increase in the loss at a wavelength of 1550 nm when the optical fiber is wound around a mandrel having a diameter of 15 mm 10 times.
- FIG. 3 is a graph showing the relationship between the second slope of the specific refractive index difference and the bending loss.
- the horizontal axis is the second inclination (Slope 2)
- the vertical axis is the bending loss.
- the second inclination is also the inclination of the refractive index distribution in the vicinity of the core 10 of the inner clad 21, and specifically, the radius (radial position) r0 to rmin at which the difference in the refractive index with respect to pure silica becomes zero. It is defined as the slope of the index of refraction distribution between. That is, the second slope is indicated by ⁇ min / (rmin-r1).
- the inclination of the refractive index distribution By appropriately designing the inclination of the refractive index distribution, it is possible to suppress the spread of the electromagnetic field distribution when the optical fiber is bent, so that the bending resistance characteristics can be maintained. As shown in FIGS. 2 and 3, when the first inclination and the second inclination are ⁇ 0.002% / ⁇ m or less, the bending loss is maintained at 0.03 dB / 10 turn or less. Therefore, in the optical fiber 1, the inclination is set to ⁇ 0.002% / ⁇ m or less. As a result, bending loss is suppressed.
- the inner clad 21 is made of silica glass containing F
- the outer clad 22 is made of silica glass containing substantially no dopant. Therefore, a large stress difference occurs at the boundary between the inner clad 21 and the outer clad 22. As a result, although the transmission loss deteriorates, the deterioration of the transmission loss can be suppressed by designing the boundary between the inner clad 21 and the outer clad 22 to be far from the central axis C.
- FIG. 4 is a graph showing the relationship between the ratio of the inner clad radius to the core radius and the transmission loss.
- the horizontal axis is the ratio r2 / r1 of the inner clad radius to the core radius
- the vertical axis is the transmission loss at a wavelength of 1550 nm. That is, FIG. 4 is a graph showing the ratio r2 / r1 dependence of the transmission loss at a wavelength of 1550 nm.
- the ratio r2 / r1 is set to 4.5 or more and 5.5 or less. As a result, transmission loss is suppressed.
- both low bending loss and low transmission loss can be achieved at the same time.
- the average concentration of Cl in the outer clad 22 is 500 wtppm or less. Therefore, in the optical fiber 1, foaming caused by Cl can be suppressed. Therefore, productivity can be improved.
- Table 1 shows the refractive index parameters of the optical fibers according to Examples and Comparative Examples, the cutoff wavelength ⁇ cc, and the mode field diameter (MFD1.31) at 1310 nm.
- Table 2 shows the transmission loss ( ⁇ 1.55) and bending loss of the optical fibers according to the examples and comparative examples at a wavelength of 1550 nm.
- the bending loss means a wavelength of 1550 nm when the optical fiber is wound once around a mandrel having a diameter of 7.5 mm, once wound around a mandrel having a diameter of 10 mm, and when the optical fiber is wound 10 times around a mandrel having a diameter of 15 mm.
- the amount of increase in loss at a wavelength of 1625 nm is
- Experimental Examples 1 to 16 and 24 are Examples. Experimental Examples 17 to 23 are comparative examples. In Experimental Examples 1 to 8 according to Examples and Experimental Examples 17 to 21 according to Comparative Examples, the MFD at a wavelength of 1310 nm is included in the range of 8.5 ⁇ m or more and 8.8 ⁇ m or less. In Experimental Examples 9 to 16 and 24 according to Examples and Experimental Examples 22 and 23 according to Comparative Examples, the MFD at a wavelength of 1310 nm is included in the range of 9 ⁇ m or more and 9.2 ⁇ m or less.
- the ratio r2 / r1 is included in the range of 4.5 or more and 5.5 or less.
- the ratio r2 / r1 is less than 4.5, and the transmission loss at a wavelength of 1550 nm is as high as 0.185 dB / km.
- the ratio r2 / r1 is larger than 5.5, and each value of bending loss is high.
- the MFD is large, the bending loss becomes large. Therefore, here, the bending loss is compared between optical fibers having the same MFD at a wavelength of 1310 nm.
- each value of bending loss is generally higher than that of the optical fibers according to Experimental Examples 1 to 8.
- each value of bending loss is higher than that in the optical fibers according to Experimental Examples 9 to 16 and 24.
- the first inclination ( ⁇ min- ⁇ (r1)) / (rmin-r1) and the second inclination ⁇ min / (rmin-r0) are both ⁇ 0.002%. It is less than / ⁇ m.
- the first inclination ( ⁇ min- ⁇ (r1)) / (rmin-r1) is ⁇ 0.001% / ⁇ m.
- the second inclination ⁇ min / (rmin-r0) is ⁇ 0.001% / ⁇ m.
- the bending losses are compared between optical fibers having similar MFDs.
- each value of bending loss is generally higher than that in the optical fibers according to Experimental Examples 1 to 8. Further, in the optical fiber according to Experimental Example 23, each value of bending loss is higher than that of the optical fibers according to Experimental Examples 9 to 16 and 24.
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Abstract
Description
耐曲げ特性を向上させるという観点では、コアへの光波の閉じ込めを強くする必要がある。つまり、ディプレスト構造では、コア及びクラッドの屈折率差を大きくするために、屈折率を変化させる多量のドーパントをコア及び内クラッドに添加する必要がある。特許文献1に開示の方法においても、外クラッド部に多量のClを添加する必要がある。このため、伝送損失が悪化する。
本開示によれば、低い曲げ損失及び低い伝送損失を両立することが可能な光ファイバを提供することができる。
最初に本開示の実施態様を列記して説明する。一実施形態に係る光ファイバは、コアと、コアを取り囲む内クラッドと、内クラッドを取り囲む外クラッドと、を備える。純シリカに対するコアの平均比屈折率差Δ1、純シリカに対する内クラッドの平均比屈折率差Δ2、及び、純シリカに対する外クラッドの平均比屈折率差Δ3は、Δ1>Δ3≧Δ2なる関係を満たす。コア半径r1に対する内クラッド半径r2の比r2/r1は、4.5以上5.5以下である。純シリカに対する比屈折率差の最小値Δminは、-0.030%以上-0.010%以下である。比屈折率差が最小値Δminとなる半径rminは、r1<rmin<r2である。コア半径r1における比屈折率差をΔ(r1)としたときに、(Δmin-Δ(r1))/(rmin-r1)は、-0.002%/μm以下である。なお、本開示で記述する屈折率として、各半径における屈折率の測定値を、例えば0.5μm区間で移動平均した値を用いることができる。
本開示の光ファイバの具体例を、以下に図面を参照しつつ説明する。なお、本発明はこれらの例示に限定されるものではなく、請求の範囲によって示され、請求の範囲と均等の意味及び範囲内でのすべての変更が含まれることが意図される。図面の説明において同一の要素には同一の符号を付し、重複する説明を省略する。
10…コア
20…クラッド
21…内クラッド
22…外クラッド
C…中心軸
Claims (15)
- コアと、
前記コアを取り囲む内クラッドと、
前記内クラッドを取り囲む外クラッドと、を備え、
純シリカに対する前記コアの平均比屈折率差Δ1、純シリカに対する前記内クラッドの平均比屈折率差Δ2、及び、純シリカに対する前記外クラッドの平均比屈折率差Δ3は、Δ1>Δ3≧Δ2なる関係を満たし、
コア半径r1に対する内クラッド半径r2の比r2/r1は、4.5以上5.5以下であり、
純シリカに対する比屈折率差の最小値Δminは、-0.030%以上-0.010%以下であり、
前記比屈折率差が最小値Δminとなる半径rminは、r1<rmin<r2であり、
コア半径r1における前記比屈折率差をΔ(r1)としたときに、(Δmin-Δ(r1))/(rmin-r1)は、-0.002%/μm以下である、
光ファイバ。 - 純シリカに対する比屈折率差がゼロになる半径をr0としたときに、r0≧r1であって、Δmin/(rmin―r0)が、-0.002%/μm以下である、
請求項1に記載の光ファイバ。 - 前記平均比屈折率差Δ2は、-0.025%以上-0.010%以下である、
請求項1又は請求項2に記載の光ファイバ。 - 前記外クラッドおける塩素の平均濃度は、500wtppm以下である、
請求項1から請求項3のいずれか1項に記載の光ファイバ。 - 前記平均比屈折率差Δ1は、0.35%以上0.45%以下である、
請求項1から請求項4のいずれか1項に記載の光ファイバ。 - 前記半径rminは、7μm以上15μm以下である、
請求項1から請求項5のいずれか1項に記載の光ファイバ。 - 前記コア半径r1は、4μm以上5μm以下である、
請求項1から請求項6のいずれか1項に記載の光ファイバ。 - 前記平均比屈折率差Δ1、前記平均比屈折率差Δ2、及び、前記平均比屈折率差Δ3は、Δ1>Δ3>Δ2なる関係を満たす、
請求項1から請求項7のいずれか1項に記載の光ファイバ。 - 前記平均比屈折率差Δ3は、-0.015%以上0.035%以下である、
請求項1から請求項8のいずれか1項に記載の光ファイバ。 - 直径15mmのマンドレルに10回巻き付けたときの波長1550nmにおける損失の増加量は、0.03dB/10turn以下である、
請求項1から請求項9のいずれか1項に記載の光ファイバ。 - 波長1550nmにおける伝送損失は、0.184dB/km以下である、
請求項1から請求項10のいずれか1項に記載の光ファイバ。 - 前記内クラッド半径r2は、18μm以上28μm以下である、
請求項1から請求項11のいずれか1項に記載の光ファイバ。 - 前記内クラッドは、フッ素を含むシリカガラスから構成されている、
請求項1から請求項12のいずれか1項に記載の光ファイバ。 - 1310nmにおけるモードフィールド径は、8.5μm以上8.8μm以下である、
請求項1から請求項13のいずれか1項に記載の光ファイバ。 - 1310nmにおけるモードフィールド径は、9μm以上9.2μm以下である、
請求項1から請求項13のいずれか1項に記載の光ファイバ。
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EP21772149.7A EP4123350A4 (en) | 2020-03-17 | 2021-03-16 | OPTICAL FIBER |
US17/759,051 US11774672B2 (en) | 2020-03-17 | 2021-03-16 | Optical fiber |
CN202180006220.3A CN114641714A (zh) | 2020-03-17 | 2021-03-16 | 光纤 |
KR1020227014202A KR20220144793A (ko) | 2020-03-17 | 2021-03-16 | 광 파이버 |
BR112022008355A BR112022008355A2 (pt) | 2020-03-17 | 2021-03-16 | Fibra ótica |
JP2022508374A JPWO2021187475A1 (ja) | 2020-03-17 | 2021-03-16 |
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WO2023042769A1 (ja) * | 2021-09-16 | 2023-03-23 | 古河電気工業株式会社 | 光ファイバ |
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JP2013035722A (ja) * | 2011-08-09 | 2013-02-21 | Furukawa Electric Co Ltd:The | 光ファイバ母材および光ファイバの製造方法 |
WO2016047749A1 (ja) * | 2014-09-26 | 2016-03-31 | 株式会社フジクラ | 光ファイバ |
JP2017026698A (ja) | 2015-07-17 | 2017-02-02 | 株式会社フジクラ | 光ファイバ |
US20190119143A1 (en) | 2017-10-20 | 2019-04-25 | Corning Incorporated | Optical fiber preforms with halogen doping |
JP2020046648A (ja) | 2018-09-20 | 2020-03-26 | 摂津化成株式会社 | 見本帳 |
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2021
- 2021-03-16 CN CN202180006220.3A patent/CN114641714A/zh active Pending
- 2021-03-16 EP EP21772149.7A patent/EP4123350A4/en active Pending
- 2021-03-16 US US17/759,051 patent/US11774672B2/en active Active
- 2021-03-16 WO PCT/JP2021/010590 patent/WO2021187475A1/ja unknown
- 2021-03-16 BR BR112022008355A patent/BR112022008355A2/pt unknown
- 2021-03-16 KR KR1020227014202A patent/KR20220144793A/ko active Search and Examination
- 2021-03-16 JP JP2022508374A patent/JPWO2021187475A1/ja active Pending
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DE4127868A1 (de) * | 1991-08-22 | 1993-02-25 | Rheydt Kabelwerk Ag | Einmoden-faser mit rampenfoermigem brechzahl-profil |
JP2013035722A (ja) * | 2011-08-09 | 2013-02-21 | Furukawa Electric Co Ltd:The | 光ファイバ母材および光ファイバの製造方法 |
WO2016047749A1 (ja) * | 2014-09-26 | 2016-03-31 | 株式会社フジクラ | 光ファイバ |
JP2017026698A (ja) | 2015-07-17 | 2017-02-02 | 株式会社フジクラ | 光ファイバ |
US20190119143A1 (en) | 2017-10-20 | 2019-04-25 | Corning Incorporated | Optical fiber preforms with halogen doping |
JP2020046648A (ja) | 2018-09-20 | 2020-03-26 | 摂津化成株式会社 | 見本帳 |
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WO2023042769A1 (ja) * | 2021-09-16 | 2023-03-23 | 古河電気工業株式会社 | 光ファイバ |
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EP4123350A4 (en) | 2023-09-13 |
JPWO2021187475A1 (ja) | 2021-09-23 |
EP4123350A1 (en) | 2023-01-25 |
US11774672B2 (en) | 2023-10-03 |
CN114641714A (zh) | 2022-06-17 |
US20230037687A1 (en) | 2023-02-09 |
BR112022008355A2 (pt) | 2022-10-18 |
KR20220144793A (ko) | 2022-10-27 |
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