JPS63318505A - Optical fiber characterized by low dispersion in wide wavelength range - Google Patents
Optical fiber characterized by low dispersion in wide wavelength rangeInfo
- Publication number
- JPS63318505A JPS63318505A JP62153344A JP15334487A JPS63318505A JP S63318505 A JPS63318505 A JP S63318505A JP 62153344 A JP62153344 A JP 62153344A JP 15334487 A JP15334487 A JP 15334487A JP S63318505 A JPS63318505 A JP S63318505A
- Authority
- JP
- Japan
- Prior art keywords
- refractive index
- index difference
- core
- optical fiber
- cladding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000006185 dispersion Substances 0.000 title claims abstract description 37
- 239000013307 optical fiber Substances 0.000 title claims abstract description 34
- 238000005253 cladding Methods 0.000 claims description 32
- 238000005452 bending Methods 0.000 abstract description 21
- 239000000835 fiber Substances 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000005672 electromagnetic field Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、広い波長域において低分散を実現し、かつケ
ーブル化におけるマイクロベンディングによる損失増の
影響が小さい光通信用の単一モード光ファイバに関する
ものである。Detailed Description of the Invention (Industrial Application Field) The present invention is directed to a single mode optical fiber for optical communications that achieves low dispersion in a wide wavelength range and is less affected by increased loss due to microbending during cabling. It is related to.
（従来の技術）
一般に、単一モード光ファイバの伝送帯域は色分散によ
って制限されることが知られている。色分散はファイバ
材料に依存する材料分散とファイバの屈折率分布に依存
する構造分散との和で与えられる。石英系光ファイバの
材料分散は波長１．３μｍ付近において零になる。従来
の単一モード光ファイバは、構造分散がほぼ零に等しく
なる規格化周波数Ｖ値の大きい範囲で製造されているた
め、分散が零となる零分散波長は約１．３μｍであり、
この波長において大容量伝送が可能であった。また、近
年、石英系ファイバの損失が最小となる波長１．５μｍ
付近において、負の大きな構造分散を実現することによ
り、材料分散を打ち消し、零分散波長を１．５μｍ帯に
シフトした分散シフト光ファイバが実用化されている。(Prior Art) It is generally known that the transmission band of a single mode optical fiber is limited by chromatic dispersion. Chromatic dispersion is given by the sum of material dispersion that depends on the fiber material and structural dispersion that depends on the refractive index distribution of the fiber. The material dispersion of a silica-based optical fiber becomes zero near a wavelength of 1.3 μm. Conventional single mode optical fibers are manufactured in a large range of normalized frequency V values where the structural dispersion is approximately equal to zero, so the zero dispersion wavelength where the dispersion becomes zero is approximately 1.3 μm.
Large-capacity transmission was possible at this wavelength. In addition, in recent years, the wavelength of 1.5 μm, where the loss of silica fiber is the minimum, has been
Dispersion-shifted optical fibers have been put into practical use in which material dispersion is canceled by realizing a large negative structural dispersion in the vicinity, and the zero dispersion wavelength is shifted to the 1.5 μm band.
しかしながら、これら光ファイバは、ひとつの波長にお
いて零分散を実現しているため、近い将来において実用
化が期待される波長多重大容量伝送方式には適さないと
いう欠点があった。このため、広い波長域において低分
散となる、広波長域低分散光ファイバの研究が精力的に
行なわれている。However, since these optical fibers achieve zero dispersion at one wavelength, they have the disadvantage that they are not suitable for wavelength multiplexed capacity transmission systems that are expected to be put into practical use in the near future. For this reason, research is being actively conducted on wide wavelength range, low dispersion optical fibers that have low dispersion over a wide wavelength range.
第２図に従来の広波長域低分散光ファイバの一例として
、Ｗ形層折率分布光ファイバ（以下、Ｗ形光ファイバと
称す）の断面図を示し、第３図には、その屈折率分布を
示す。図中、１はコア、２は中間層、３はクラッドであ
る。また、第４図にＷ形光ファイバの分散波長特性を理
論計算により求めた一例を示す。尚、ここで行った分散
波長特性の理論計算は特開昭６２−５２５０８号公報に
開示されている方法、即ち、光ファイバの屈折率分布を
径方向に多層分割し、各層での電磁界分布を求め、各層
での電磁界成分の境界条件から伝搬定数を数値的に求め
る方法を用いた。Ｗ形光ファイバは、広波長域低分散を
実現しつつ、クラッド３のモードカットフィルタとして
の効果により、単一モードで動作するファイバである。Fig. 2 shows a cross-sectional view of a W-shaped layered index-gradient optical fiber (hereinafter referred to as W-shaped optical fiber) as an example of a conventional wide wavelength range low dispersion optical fiber, and Fig. 3 shows its refractive index. Show the distribution. In the figure, 1 is a core, 2 is an intermediate layer, and 3 is a cladding. Further, FIG. 4 shows an example of the dispersion wavelength characteristics of a W-shaped optical fiber obtained by theoretical calculation. The theoretical calculation of the dispersion wavelength characteristics performed here was performed using the method disclosed in Japanese Patent Application Laid-Open No. 62-52508, in which the refractive index distribution of the optical fiber is divided into multiple layers in the radial direction, and the electromagnetic field distribution in each layer is calculated. We used a method to numerically determine the propagation constant from the boundary conditions of the electromagnetic field components in each layer. The W-type optical fiber is a fiber that operates in a single mode due to the effect of the cladding 3 as a mode cut filter while realizing low dispersion in a wide wavelength range.
第４図より、はぼ波長１．３５〜ｌ。６μｍにおいて、
分散値σが±３ ｐｓ／ｋａ＋／ｎａ＋以内を満足する
ことがわかる。From FIG. 4, the wavelength is 1.35-1. At 6 μm,
It can be seen that the variance value σ satisfies within ±3 ps/ka+/na+.
第５図に波長１．５〜１．８μｍにおいて分散値σが±
２ ｐｓ／ｋｍ／ｎｍ以内であるＷ形光ファイバのモー
ドフィールド径２ｖと許容曲げ半径Ｒの関係を示す。こ
こで許容曲げ半径Ｒは、一様曲げ損失が０．０１ｄＢ／
ｋｍとなる曲げ径を表す。実用的な光ファイバにおいて
、モードフィールド径２ｗ及び許容曲げ半径Ｒはｍ要な
パラメータである。モードフィールド径２Ｗついては、
低損失接続を可能とするためには、現時点では８μｍ以
上の値が必要であると考られている。また、許容曲げ半
径Ｒついては、現在使用されているケーブル構造におい
て、ケーブル化、布設時の損失増を抑えるためには、許
容曲げ半径Ｒは約６ｃｍ以下の値が必要であり、Ｗ形光
ファイバのパラメータは、モードフィールド径２Ｗ８μ
ｍにおいて許容曲げ半径Ｒが最小となるものを選定して
いた。また、第５図のデータを得るために用いたＷ形光
ファイバは、第３図に示すパラメータがコア１の半径ａ
ｌが４．３μｍ１コア１のクラッド３に対する比屈折率
差Δｌが０゜４６％、コア１の半径ａｌと中間層２の半
径ａ２との半径比（ａｌ／ａ２）が０．７、更に中間層
２のクラッド３に対する比屈折率差Δ２と前記コア１の
比屈折率差Δｌとの比屈折率差比（Δ２／Δｌ）が０．
８である従来のものでは最適のものである。Figure 5 shows that the dispersion value σ is ± at wavelength 1.5 to 1.8 μm.
The relationship between the mode field diameter 2v of a W-shaped optical fiber and the allowable bending radius R, which is within 2 ps/km/nm, is shown. Here, the allowable bending radius R is such that the uniform bending loss is 0.01 dB/
Represents the bending diameter in km. In a practical optical fiber, the mode field diameter 2w and the allowable bending radius R are essential parameters. Regarding mode field diameter 2W,
At present, it is believed that a value of 8 μm or more is required to enable low-loss connections. Regarding the allowable bending radius R, in order to suppress the increase in loss during cable formation and installation in the currently used cable structure, the allowable bending radius R must be approximately 6 cm or less, and W-type optical fiber The parameters are mode field diameter 2W8μ
The one with the minimum allowable bending radius R at m was selected. In addition, the W-shaped optical fiber used to obtain the data in FIG. 5 has the parameters shown in FIG.
The relative refractive index difference Δl of the core 1 with respect to the cladding 3 is 0°46%, the radius ratio (al/a2) between the radius al of the core 1 and the radius a2 of the intermediate layer 2 is 0.7, and the intermediate The relative refractive index difference ratio (Δ2/Δl) between the relative refractive index difference Δ2 of the layer 2 with respect to the cladding 3 and the relative refractive index difference Δl of the core 1 is 0.
The conventional one having a value of 8 is the optimum one.
（発明が解決しようとする問題点）
しかしながら、上記Ｗ形光ファイバは、第５図より明ら
かな様に、モードフィールド径８μｍにおいて、許容曲
げ半径Ｒが約７ ｃｍとなってしまうため曲げ損失が大
きく実用化するには大きな問題点となっていた。(Problems to be Solved by the Invention) However, as is clear from FIG. 5, in the W-shaped optical fiber, the allowable bending radius R is approximately 7 cm when the mode field diameter is 8 μm, resulting in bending loss. There were major problems in putting it into practical use.
本発明の目的は、上記問題点に鑑み、モードフィールド
径を大きくしても曲げ損失が小さい広波長域低分散光フ
ァイバを提供することにある。SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide a wide wavelength range low dispersion optical fiber that exhibits low bending loss even when the mode field diameter is increased.
（問題点を解決するための手段）
本発明は上記目的を達成するため、コアとクラッドとの
間にクラッドの屈折率よりも低い屈折率を有する中間層
を備えた広波長域低分散光ファイバにおいて、中間層と
クラッドとの間にクラッドの屈折率よりも高い屈折率を
有するサイドコアを設け、サイドコアと中間層との半径
比がり、Ｓ〜１．７、中間層のクラッドに対する比屈折
率差（絶対値）とコアのクラッドに対する比屈折率差と
の比屈折率差比が０．３〜０６５、更に、サイドコアの
クラッドに対する比屈折率差と前記コアの比屈折率差と
の比屈折率差比が０．１−０．３５となるように形成し
た。(Means for solving the problems) In order to achieve the above object, the present invention provides a wide wavelength range low dispersion optical fiber comprising an intermediate layer having a refractive index lower than the refractive index of the cladding between the core and the cladding. , a side core having a refractive index higher than that of the cladding is provided between the intermediate layer and the cladding, the radius ratio of the side core and the intermediate layer is S ~ 1.7, and the relative refractive index difference of the intermediate layer with respect to the cladding is (absolute value) and the relative refractive index difference of the core with respect to the cladding is 0.3 to 065, and furthermore, the relative refractive index difference of the side core with respect to the cladding and the relative refractive index difference of the core is 0.3 to 065. It was formed so that the difference ratio was 0.1-0.35.
（作用）
本発明によれば、中間層とクラッドとの間にクラッドの
屈折率よりも高い屈折率を有し最適化されたサイドコア
を設けることにより、広波長域低分散性を損なうことな
く、大きなモードフィールド径でも曲げ損失を小さくで
きる。(Function) According to the present invention, by providing an optimized side core having a refractive index higher than the refractive index of the cladding between the intermediate layer and the cladding, without impairing low dispersion in a wide wavelength range, Bending loss can be reduced even with a large mode field diameter.
（実施例）
第１図は、本発明による広波長域低分散光ファイバの断
面図を示し、第６図はその半径方向を拡大した屈折率分
布を示す図であって、従来と同一構成のものは同一符号
を以って表わす。即ち、１はコア、２は中間層、３はク
ラッドである。４は中間層２とクラッド３との間に設け
られたサイドコアである。また、コア１の屈折立設をｎ
ｌ、中間層２の屈折率をｎ ２ 、クラッド３の屈折率
をＲ３、サイドコア４の屈折率をＩ４とすると、各々の
屈折率は下記（１）式の関係を満足している。(Example) Fig. 1 shows a cross-sectional view of a wide wavelength range low dispersion optical fiber according to the present invention, and Fig. 6 shows a refractive index distribution enlarged in the radial direction. Objects are represented by the same symbols. That is, 1 is a core, 2 is an intermediate layer, and 3 is a cladding. 4 is a side core provided between the intermediate layer 2 and the cladding 3. In addition, the bent vertical position of core 1 is set to n
When the refractive index of the intermediate layer 2 is n 2 , the refractive index of the cladding 3 is R3, and the refractive index of the side core 4 is I4, each refractive index satisfies the relationship of equation (1) below.
ｎｌ ＞Ｉ４ ＞Ｒ３＞Ｒ２・・・（１）また、第６図
に示すようにコア１、中間層２及びサイドコア４のクラ
ッド３に対する比屈折率差（絶対値）はそれぞれΔｌ、
Δ２及びΔ４であり、コア１、中間層２及びサイドコア
４の半径はａｌ。nl >I4 >R3>R2 (1) Also, as shown in FIG. 6, the relative refractive index differences (absolute values) of the core 1, intermediate layer 2, and side core 4 with respect to the cladding 3 are Δl,
Δ2 and Δ4, and the radius of the core 1, intermediate layer 2, and side core 4 is al.
Ｉ２．Ｉ４である。I2. It is I4.
ここで、第６図に示すファイバの構造パラメータのうち
半径について、コア１の半径ａｌと中間層２の半径ａ２
との半径比をＲ１，サイドコア４の半径ａ４と中間層２
の半径ａ２との半径比をＲ４として下記の（２） 、
（３）式のように定義する。Here, regarding the radius among the structural parameters of the fiber shown in FIG. 6, the radius al of the core 1 and the radius a2 of the intermediate layer 2 are
R1 is the radius ratio between the radius a4 of the side core 4 and the intermediate layer 2.
Assuming the radius ratio of radius a2 to R4, the following (2),
Define as shown in equation (3).
ＲＬ −ａｌ ／ａ２ ＝−（２）Ｒ４−Ｉ４
／ａ２ −（３）
更に、各部のクラッド３に対する比屈折率差について、
中間層２の比屈折率差Δ２とコア１の比屈折率差Δｌと
の比屈折率差比をＩ２、サイドコア４の比屈折率差Δ４
とコア１の比屈折率差Δｌとの比屈折率差比を１４とし
て下記の（４） 、 （５）式のように定義する。RL-al/a2=-(2)R4-I4
/a2-(3) Furthermore, regarding the relative refractive index difference of each part with respect to the cladding 3,
The relative refractive index difference ratio between the relative refractive index difference Δ2 of the intermediate layer 2 and the relative refractive index difference Δl of the core 1 is I2, and the relative refractive index difference Δ4 of the side core 4
The ratio of the relative refractive index difference Δl of the core 1 to the relative refractive index difference Δl of the core 1 is defined as 14 as shown in the following equations (4) and (5).
Ｉ２−Δ２／Δｌ ・・・（４）Ｉ４−Δ４／
Δｌ ・・・（５）第７図は、波長１．５５μ
ｍにおいて許容曲げ半径Ｒが６ｃ＋ａ以下となる本発明
によるファイバの上記（３） 、 （５）式で定義した
サイドコア４と中間層２との半径比Ｒ４とサイドコア４
とコア１との比屈折率差比Ｉ４との関係を示したもので
あり、縦軸は半径比Ｒ４、横軸は比屈折率差比１４を表
わしている。また、このファイバのモードフィールド径
２ｖは波長１．５５μｍにおいて８μｍ１分散値は波長
１．５ ｕｍ−１，８ａｍにおいて±２ ｐｓ／ｋｍ／
ｎｍ以内としである。また前記（２）式で定義したコア
ｌと中間層２との半径比Ｒ１は０．５に設定してあり、
図中、斜線Ａで示す領域は中間層２とコア１との比屈折
率差比１２とサイドコア４とコア１との比屈折率差比■
４との和が０．５、斜線Ｂで示す領域は比屈折率差比１
２と比屈折率差比■４との和が０．７となる領域を示し
ており、ここで設定した値は理論的に最適な値として求
められたものである。I2-Δ2/Δl...(4) I4-Δ4/
Δl...(5) In Figure 7, the wavelength is 1.55μ
The radius ratio R4 between the side core 4 and the intermediate layer 2 defined by the above equations (3) and (5) of the fiber according to the present invention, in which the allowable bending radius R is 6c+a or less at m, and the side core 4
The graph shows the relationship between the relative refractive index difference ratio I4 and the core 1, with the vertical axis representing the radius ratio R4 and the horizontal axis representing the relative refractive index difference ratio 14. In addition, the mode field diameter 2v of this fiber is 8 μm at a wavelength of 1.55 μm, and the dispersion value is ±2 ps/km/
It is within nm. Furthermore, the radius ratio R1 between the core l and the intermediate layer 2 defined by the above equation (2) is set to 0.5,
In the figure, the area indicated by diagonal lines A is the relative refractive index difference ratio 12 between the intermediate layer 2 and the core 1 and the relative refractive index difference ratio ■ between the side core 4 and the core 1.
The sum of 4 and 4 is 0.5, and the area indicated by diagonal line B has a relative refractive index difference ratio of 1.
2 and the relative refractive index difference ratio ■4 is 0.7, and the value set here was determined as the theoretically optimum value.
第７図から明らかなように、クラッド３に対するサイド
コア４の比屈折率差Δ４とコア１の比屈折率差Δ１との
比屈折率差比Ｉ４ （Δ４／Δｌ）の値を０．１〜０
．３５、サイドコア４の半径ａ４と中間層２の半径ａ２
との半径比Ｒ４（ａ４／ａ２）の値を１．３〜１．７の
間に設定することにより許容曲げ半径Ｒを波長１．５５
μｍにおいて６ｃｍ以下とすることが可能である。また
比屈折率差比■２とＩ４との和が０．５及び０．７であ
る斜線領域Ａ及びＢの比屈折率差比１４の値がほぼ０．
１〜０．２及び０．２〜０．３５であることから、クラ
ッド３に対する中間層２の比屈折率差Δ２とコアｌの比
屈折率差△ｌとの比屈折率差比１２の値を０，３〜０．
５の間に設定すれば良いことがわかる。As is clear from FIG. 7, the value of the relative refractive index difference ratio I4 (Δ4/Δl) between the relative refractive index difference Δ4 of the side core 4 with respect to the cladding 3 and the relative refractive index difference Δ1 of the core 1 is set to 0.1 to 0.
．． 35. Radius a4 of side core 4 and radius a2 of intermediate layer 2
By setting the value of the radius ratio R4 (a4/a2) between 1.3 and 1.7, the allowable bending radius R can be adjusted to a wavelength of 1.55.
It is possible to make it 6 cm or less in μm. Further, the value of the relative refractive index difference ratio 14 in the shaded areas A and B, where the sum of the relative refractive index difference ratio 2 and I4 is 0.5 and 0.7, is approximately 0.
1 to 0.2 and 0.2 to 0.35, the value of the relative refractive index difference ratio 12 between the relative refractive index difference Δ2 of the intermediate layer 2 with respect to the cladding 3 and the relative refractive index difference Δl of the core I. 0.3~0.
It turns out that it is best to set it between 5 and 5.
本実施例によれば、中間層２とクラッド３との間にクラ
ッド３の屈折率よりも高く、コア１よりも低い屈折率を
有するサイドコア４を設け、サイドコア４と中間層２と
の半径比がＲ４が１．３〜１．７、中間層２のクラッド
３に対する比屈折率差Δ２ （絶対値）とコア１のクラ
ッド３に対する比屈折率差Δｌとの比屈折率差比Ｉ２が
０，３〜０．５、更に、サイドコア４のクラッド３に対
する比屈折率差Δ４と前記コア１の比屈折率差Δ１との
比屈折率差比■４が０．１−０．３５となるように形成
することにより、ファイバの広波長域低分散性に影響を
与えないように曲げ特性を改善でき、波長多重大容量伝
送方式に適用できる実用的な広波長域低分散光ファイバ
を実現できる。According to this embodiment, a side core 4 having a refractive index higher than that of the cladding 3 and lower than that of the core 1 is provided between the intermediate layer 2 and the cladding 3, and the radius ratio of the side core 4 and the intermediate layer 2 is R4 is 1.3 to 1.7, and the relative refractive index difference ratio I2 between the relative refractive index difference Δ2 (absolute value) of the intermediate layer 2 with respect to the cladding 3 and the relative refractive index difference Δl of the core 1 with respect to the cladding 3 is 0, 3 to 0.5, and further so that the relative refractive index difference ratio 4 between the relative refractive index difference Δ4 of the side core 4 with respect to the cladding 3 and the relative refractive index difference Δ1 of the core 1 is 0.1 to 0.35. By forming this, the bending characteristics can be improved so as not to affect the wide wavelength range low dispersion property of the fiber, and a practical wide wavelength range low dispersion optical fiber that can be applied to a wavelength division multiplexing capacity transmission system can be realized.
（発明の効果）
以上説明したように、本発明によれば、広波長域低分散
性を損なうことなく、広いモードフィールド径において
、曲げ特性を大幅に改善できるので、波長多重大容量伝
送方式に適用できる実用的な広波長域低分散光ファイバ
を実現できる利点がある。(Effects of the Invention) As explained above, according to the present invention, the bending characteristics can be significantly improved in a wide mode field diameter without impairing the low dispersion property in a wide wavelength range. It has the advantage of realizing a practical wide wavelength range low dispersion optical fiber that can be applied.
第１図は本発明による広波長域低分散光ファイバを示す
断面図、第２図は従来の広波長域低分散光ファイバの断
面図、第３図は従来の光ファイバの屈折率分布を示す図
、第４図は従来の光ファイバの分散波長特性を示す図、
第５図は従来の光ファイバのモードフィールド径と許容
曲げ半径の関係を示す図、第６図は本発明による光ファ
イバの屈折率分布を示す図、第７図は本発明による光フ
ァイバの許容曲げ半径が６ ａｍ以下となる比屈折率差
比と半径比の関係を示す図である。
図中、１・・・コア、２・・・中間層、３・・・クラッ
ド、４・・・サイドコア。Fig. 1 is a cross-sectional view showing a wide wavelength range low dispersion optical fiber according to the present invention, Fig. 2 is a cross sectional view of a conventional wide wavelength range low dispersion optical fiber, and Fig. 3 shows the refractive index distribution of the conventional optical fiber. Figure 4 is a diagram showing the dispersion wavelength characteristics of a conventional optical fiber.
FIG. 5 is a diagram showing the relationship between the mode field diameter and the allowable bending radius of a conventional optical fiber, FIG. 6 is a diagram showing the refractive index distribution of the optical fiber according to the present invention, and FIG. 7 is a diagram showing the allowable bending radius of the optical fiber according to the present invention. FIG. 3 is a diagram showing the relationship between the relative refractive index difference ratio and the radius ratio so that the bending radius is 6 am or less. In the figure, 1...core, 2...middle layer, 3...cladding, 4...side core.
Claims (1)
折率を有する中間層を備えた広波長域低分散光ファイバ
において、 中間層とクラッドとの間にクラッドの屈折率よりも高い
屈折率を有するサイドコアを設け、サイドコアと中間層
との半径比が１．３〜１．７、中間層のクラッドに対す
る比屈折率差（絶対値）とコアのクラッドに対する比屈
折率差との比屈折率差比が０．３〜０．５、更に、サイ
ドコアのクラッドに対する比屈折率差と前記コアの比屈
折率差との比屈折率差比が０．１〜０．３５となるよう
に形成した ことを特徴とする広波長域低分散光ファイバ。[Claims] In a wide wavelength range low dispersion optical fiber comprising an intermediate layer between a core and a cladding having a refractive index lower than that of the cladding, the refractive index of the cladding is between the intermediate layer and the cladding. A side core having a higher refractive index than that of The relative refractive index difference ratio between the side core and the cladding is 0.3 to 0.5, and the relative refractive index difference ratio between the side core and the cladding is 0.1 to 0.35. A wide wavelength range low dispersion optical fiber characterized by being formed so as to have the following characteristics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62153344A JPS63318505A (en) | 1987-06-22 | 1987-06-22 | Optical fiber characterized by low dispersion in wide wavelength range |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62153344A JPS63318505A (en) | 1987-06-22 | 1987-06-22 | Optical fiber characterized by low dispersion in wide wavelength range |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63318505A true JPS63318505A (en) | 1988-12-27 |
Family
ID=15560419
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62153344A Pending JPS63318505A (en) | 1987-06-22 | 1987-06-22 | Optical fiber characterized by low dispersion in wide wavelength range |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63318505A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0848266A1 (en) * | 1996-12-12 | 1998-06-17 | Sumitomo Electric Industries, Ltd | Single-mode optical fiber |
| EP0856754A1 (en) * | 1997-01-29 | 1998-08-05 | Sumitomo Electric Industries, Ltd. | Single-mode optical fiber |
-
1987
- 1987-06-22 JP JP62153344A patent/JPS63318505A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0848266A1 (en) * | 1996-12-12 | 1998-06-17 | Sumitomo Electric Industries, Ltd | Single-mode optical fiber |
| EP0856754A1 (en) * | 1997-01-29 | 1998-08-05 | Sumitomo Electric Industries, Ltd. | Single-mode optical fiber |
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