JPS63206710A - Absolute single polarization optical fiber and its production - Google Patents
Absolute single polarization optical fiber and its productionInfo
- Publication number
- JPS63206710A JPS63206710A JP62039231A JP3923187A JPS63206710A JP S63206710 A JPS63206710 A JP S63206710A JP 62039231 A JP62039231 A JP 62039231A JP 3923187 A JP3923187 A JP 3923187A JP S63206710 A JPS63206710 A JP S63206710A
- Authority
- JP
- Japan
- Prior art keywords
- sio
- intermediate layer
- core
- optical fiber
- base material
- 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
- 239000013307 optical fiber Substances 0.000 title claims abstract description 38
- 230000010287 polarization Effects 0.000 title claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 title claims description 16
- 239000000463 material Substances 0.000 claims abstract description 49
- 238000000034 method Methods 0.000 claims abstract description 13
- 238000005553 drilling Methods 0.000 claims abstract description 7
- 238000005253 cladding Methods 0.000 claims description 31
- 238000005491 wire drawing Methods 0.000 claims description 2
- 238000009826 distribution Methods 0.000 abstract description 8
- 230000005684 electric field Effects 0.000 abstract description 5
- 239000000835 fiber Substances 0.000 abstract 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 40
- 235000012239 silicon dioxide Nutrition 0.000 description 21
- 229910052681 coesite Inorganic materials 0.000 description 19
- 229910052906 cristobalite Inorganic materials 0.000 description 19
- 239000000377 silicon dioxide Substances 0.000 description 19
- 229910052682 stishovite Inorganic materials 0.000 description 19
- 229910052905 tridymite Inorganic materials 0.000 description 19
- YBMRDBCBODYGJE-UHFFFAOYSA-N germanium dioxide Chemical compound O=[Ge]=O YBMRDBCBODYGJE-UHFFFAOYSA-N 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- BYFGZMCJNACEKR-UHFFFAOYSA-N aluminium(i) oxide Chemical compound [Al]O[Al] BYFGZMCJNACEKR-UHFFFAOYSA-N 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- 229910005793 GeO 2 Inorganic materials 0.000 description 1
- 229910020489 SiO3 Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007524 flame polishing Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
Classifications
-
- 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
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/105—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type having optical polarisation effects
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、コヒーレント光伝送方式用の伝送媒体、また
は、偏波特性を有する光回路素子の間の結合に必要な単
一直線偏波を伝送する絶対単一偏波光ファイバおよびそ
の製造方法に関するものである。Detailed Description of the Invention [Industrial Application Field] The present invention provides a transmission medium for a coherent optical transmission system or a single linearly polarized wave necessary for coupling between optical circuit elements having polarization characteristics. The present invention relates to an absolutely single polarization optical fiber for transmission and a method for manufacturing the same.
［従来の技術］
従来、考えられていた絶対単一偏波光ファイバは第５図
のような断面構造、すなわち、コア１を含むように長方
形状の第１中間層２および第１中間層の長手方向と直角
の方向に２個の第２中間層３を有し、これら全体がクラ
ッド４に埋め込まれている構造を有するものであった。[Prior Art] Absolutely single-polarized optical fibers that have been considered in the past have a cross-sectional structure as shown in FIG. It had a structure in which it had two second intermediate layers 3 in a direction perpendicular to the direction, and these were entirely embedded in a cladding 4.
この絶対単一偏波光ファイバは、第１中間層２の屈折率
をクラッド４の屈折率より低くすることにより、構造に
依存した複屈折を誘起するするものである。しかし、こ
の構造では絶対単一偏波を実現するために必要な複屈折
率を大きくすることは不可能であった。This absolutely single polarization optical fiber induces structure-dependent birefringence by making the refractive index of the first intermediate layer 2 lower than the refractive index of the cladding 4. However, with this structure, it was impossible to increase the birefringence necessary to achieve absolute single polarization.
この絶対単一偏波光ファイバの製造方法として、第６図
に示すように、同心円状のコア部１ａ。As a method of manufacturing this absolutely single polarization optical fiber, as shown in FIG. 6, a concentric core portion 1a is used.
第１中間層部２ａおよびクラッド部４ａよりなるコア用
母材５−を破線で示すように板状に研削・研磨した後、
第７図に示すように同心円状の応力付与母材（第２中間
層部３ａに相当）を半円柱状に研削・研磨し、第８図に
示すように石英管６に挿入して線引く方法が考えられて
いた。After grinding and polishing the core base material 5- consisting of the first intermediate layer portion 2a and the cladding portion 4a into a plate shape as shown by the broken line,
As shown in FIG. 7, a concentric stress-applying base material (corresponding to the second intermediate layer portion 3a) is ground and polished into a semi-cylindrical shape, and as shown in FIG. 8, it is inserted into a quartz tube 6 and drawn. A method was being considered.
この方法では、研削・研磨の工程が多いこと、光フアイ
バ用の母材を設計通りに製造するのが困難なことおよび
線引き時の光フアイバ長手方向の線径ゆらぎが大きいこ
と等から低損失、低クロストークの絶対単一偏波光ファ
イバを実現することは不可能であった。This method requires many grinding and polishing steps, it is difficult to manufacture the base material for the optical fiber according to the design, and there is large fluctuation in the wire diameter in the longitudinal direction of the optical fiber during drawing. It has been impossible to realize an absolutely single polarization optical fiber with low crosstalk.
［発明が解決しようとする問題点］
本発明は上に述べた従来の欠点を解決し、複屈折率が十
分に大きく、絶対単一偏波の実現できる光ファイバおよ
び簡単な工程で絶対単一偏波光ファイバを製造する方法
を提供することを目的とする。[Problems to be Solved by the Invention] The present invention solves the above-mentioned conventional drawbacks, and creates an optical fiber that has a sufficiently large birefringence and can realize absolutely single polarized waves, and a simple process that can generate absolutely single polarized waves. It is an object of the present invention to provide a method of manufacturing a polarized optical fiber.
ｃ問題点を解決するための手段］
このような目的を達成するために本発明の絶対単一偏波
光ファイバは、クラッドと、クラッドの中心に位置する
コアと、それぞれコアと接しかつ互いにコアの直径方向
反対側に設けた２個の第１中間層と、２個の第１中間層
の配列方向と直角方向にかつそれぞれコアから離れかつ
コアを挟んで設けた２個の第２中間層とからなることを
特徴とする。Means for Solving the Problem] In order to achieve such an object, the absolute single polarization optical fiber of the present invention has a cladding, a core located at the center of the cladding, and a core that is in contact with the core and mutually. two first intermediate layers provided on opposite sides in the diametrical direction; and two second intermediate layers provided in a direction perpendicular to the arrangement direction of the two first intermediate layers, each separated from the core and sandwiching the core. It is characterized by consisting of.
また、本発明の絶対単一偏波光ファイバの製造方法は、
線引き後それぞれコアおよびクラッドとなるコア部およ
びクラッド部を有する母材に、コア部に接しかつコア部
の直径方向反対側にそれぞれ第１中間層用の孔を、２個
の孔の中心を結ぶ方向と直角方向で、コア部を挟む位置
にそれぞれ第２中間層用の孔を開け、それぞれ２個の第
１中間層用の孔および第２中間層の孔にそれぞれ第１中
間層用母材および第２中間層用母材を挿入して一体化し
、線引きして光ファイバとすることを特徴とする。Further, the method for manufacturing an absolutely single polarization optical fiber of the present invention includes:
After drawing, a hole for the first intermediate layer is connected to the base material having a core part and a clad part, which will become the core and cladding, respectively, in contact with the core part and on the opposite side in the diametrical direction of the core part, and connect the centers of the two holes. In the direction perpendicular to the direction, holes for the second intermediate layer are formed at positions sandwiching the core part, and the two holes for the first intermediate layer and the holes in the second intermediate layer are filled with the base material for the first intermediate layer. Then, a second intermediate layer base material is inserted and integrated, and an optical fiber is formed by drawing.
［作 用］
本発明によれば、複屈折率が十分に大きく、絶対単一偏
波の実現が可能である。また本発明の製造は工程が簡単
であり、特に超音波ドリルによる孔開けは０．１ｍｍ程
度の精度で行うことができ、ドリルによる孔開は後、孔
を火炎研府することにより、構造ゆらぎによるクロスト
ーク特性の劣化、伝送損失の増加を抑制でき、設計通り
の絶対単一偏波光ファイバを実現できる。[Function] According to the present invention, the birefringence is sufficiently large and absolute single polarization can be realized. In addition, the manufacturing process of the present invention is simple, and in particular, drilling with an ultrasonic drill can be performed with an accuracy of about 0.1 mm. This makes it possible to suppress the deterioration of crosstalk characteristics and increase in transmission loss caused by this, and to realize an absolutely single polarization optical fiber as designed.
［実施例］ 以下に、図面を参照して、本発明の詳細な説明する。[Example] The present invention will be described in detail below with reference to the drawings.
衷ｈ」０゜
第１図に本発明の実施例の断面構造を示す。コア１に接
してコア１の直径方向の反対側にそれぞれ第１中間層２
＾および２Ｂが設けられている。２個の第１中間層の配
列方向と直交する方向に第２中間層３＾および３Ｂが配
設されている。Figure 1 shows a cross-sectional structure of an embodiment of the present invention. A first intermediate layer 2 is provided in contact with the core 1 and on the opposite side of the core 1 in the diametrical direction.
^ and 2B are provided. Second intermediate layers 3^ and 3B are arranged in a direction perpendicular to the arrangement direction of the two first intermediate layers.
この例ではコア１はＧＩＩ０２・ＳｉＯ２％第１中間層
２八および２ＢはそれぞれＳｉＯ２、Ｐ２Ｏ５，０，、
第２中間層３＾および３ＢはそれぞれＢ、０３・ＳｉＯ
２ ％クラッド４はＳｉＯ２である。コアとクラッドの
比屈折率差は０．３４％、第１中間層のクラッドに対す
る比屈折率差は−１％、第２中間層のクラッドに対する
比屈折率差は−０，５％とした。絶対単一偏波を実現す
るためには複屈折率を・ＳｉＯ２、Ｐ２Ｏ５・ＳｉＯ−
３以上とする必要があるため、第１中間層のクララドに
対する比屈折率差は−０，３％以下、第２中間層のクラ
ッドに対する比屈折率差は−０，５％以下とする必要が
ある。第１中間層により、コア中で電界分布の異方性お
よび応力の異方性が誘起される。In this example, the core 1 is GII02.SiO2%, and the first intermediate layer 28 and 2B are SiO2, P2O5,0, respectively.
The second intermediate layers 3^ and 3B are B, 03.SiO, respectively.
The 2% cladding 4 is SiO2. The relative refractive index difference between the core and the cladding was 0.34%, the relative refractive index difference of the first intermediate layer with respect to the cladding was -1%, and the relative refractive index difference of the second intermediate layer with respect to the cladding was -0.5%. In order to achieve absolute single polarization, the birefringence should be changed to ・SiO2, P2O5・SiO−
3 or more, the relative refractive index difference of the first intermediate layer with respect to the cladding must be −0.3% or less, and the relative refractive index difference of the second intermediate layer with respect to the cladding must be −0.5% or less. be. The first intermediate layer induces electric field distribution anisotropy and stress anisotropy in the core.
第２中間層により、コア中に応力の異方性が誘起される
。この時の規格化応力付与部間隔ｒ／ａ （ａはコア半
径）とモード複屈折率の関係を第２図に示す。曲線Ｂに
示した第２中間層のみの場合に比べ、曲線Ａに示すよう
に、第２中間層に加え第１中間層を設けることにより、
モード複屈折率が大きくなる。The second intermediate layer induces stress anisotropy in the core. The relationship between the normalized stress applying part spacing r/a (a is the core radius) and the mode birefringence at this time is shown in FIG. Compared to the case of only the second intermediate layer shown in curve B, by providing the first intermediate layer in addition to the second intermediate layer as shown in curve A,
Mode birefringence increases.
本実施では、コア部にＧｅＯ２・ＳｉＯ２、ＧｅＯ２を
用いたが、ＧｅＯ２・Ｐ２Ｏ５・ＳｉＯ２またはＰ＊Ｏ
ｓ・５ｔ（ｈまたはＡｌ２Ｏ，・ＳｉＯ２およびＧｅＯ
２を用いてもよい。第１中間層用の母材としては、Ｔ・
ＳｉＯ２、Ｐ２Ｏ５・ＳｉＯ３・ＳｉＯ２を用いてもよ
い。第２中間層用の母材としては、Ｂ２Ｏ３・ＳｉＯ２
、Ｐ２ＯＳｉＯ２またはＰ２Ｏ，・ＳｉＯ２、Ｐ２Ｏ５
，０゜または八１２０３・ＳｉＯ２、Ｐ２Ｏ５，０２ま
たはＧ＠０２・Ｂ２Ｏ３・ＳｉＯ２、ＧｅＯ，を用いて
もよい。In this implementation, GeO2・SiO2, GeO2 was used for the core part, but GeO2・P2O5・SiO2 or P*O
s・5t(h or Al2O, ・SiO2 and GeO
2 may be used. The base material for the first intermediate layer is T.
SiO2, P2O5.SiO3.SiO2 may also be used. As the base material for the second intermediate layer, B2O3・SiO2
, P2OSiO2 or P2O, ・SiO2, P2O5
,0° or 81203.SiO2, P2O5,02 or G@02.B2O3.SiO2, GeO, may also be used.
第１中間層の屈折率がクラッドの屈折率と等しい場合は
、光フアイバコア中の電界分布をＸ方向とＸ方向で均一
化することができる。When the refractive index of the first intermediate layer is equal to the refractive index of the cladding, the electric field distribution in the optical fiber core can be made uniform in the X direction and the X direction.
第３図を参照して、第１図に示した絶対単一偏波光ファ
イバの製造方法を説明する。With reference to FIG. 3, a method for manufacturing the absolutely single polarization optical fiber shown in FIG. 1 will be described.
コア部１１およびクラッド部１４よりなる母材ｌＯに、
超音波ドリルを用いて、第１中間層用の孔１２ａ、１２
ｂおよび第２中間層用の孔１３ａ、１３ｂをあけた後、
第１中間層の母材１２＾、１２Ｂ 、第２中間層用の母
材１３＾、１３Ｂを挿入する。各母材は、例えばＶＡＤ
法により作製されたものである。コア部１１の径は２ｍ
ａ＋ 、クラッド部１４の径は４０Ｂｍ、第１中間層用
用材１２Ａ、１２Ｂの径は５１１１ｍ、第２中間層用母
材１３＾、１３Ｂの径は１２ｎ＋ｍである。第１中間層
用母材は直径５ＩＩＩＩｌｌでｘ、Ｘ方向の電界に依存
した屈折率を誘起するためコアに接し、応力を付与する
ことを目的とする第２中間層用母材は直径１２＋＋＋Ｉ
１１で、その中心はコア部の中心から９＋ｎｍ ａすれ
たところにある。これらの孔は超音波ドリルを用いて孔
開けした後に、火炎研磨により内面処理がされている。A base material IO consisting of a core portion 11 and a cladding portion 14,
Holes 12a, 12 for the first intermediate layer are drilled using an ultrasonic drill.
After drilling holes 13a and 13b for the second intermediate layer,
The base materials 12^, 12B for the first intermediate layer and the base materials 13^, 13B for the second intermediate layer are inserted. Each base material is, for example, VAD
It was made by the method. The diameter of the core part 11 is 2m
a+, the diameter of the cladding part 14 is 40Bm, the diameter of the first intermediate layer materials 12A and 12B is 5111m, and the diameter of the second intermediate layer base materials 13^ and 13B is 12n+m. The base material for the first intermediate layer has a diameter of 5IIIll and is in contact with the core in order to induce a refractive index depending on the electric field in the x and x directions, and the base material for the second intermediate layer has a diameter of 12++I
11 and its center is 9+nm away from the center of the core. After drilling these holes using an ultrasonic drill, the inner surfaces are treated by flame polishing.
第１中間層用の母材１２＾、１２Ｂ 、第２中間層用の
母材１３Ａ、１３Ｂおよびこれらに対応する母材ＩＯ中
の孔１２ａ、１２ｂ、１３ａ、１３ｂは、挿入前ニフッ
酸により表面処理が施されている。母材ＩＯ中の孔に第
１中間層用の母材、第２中間層用の母材を装着した後、
１５００℃でこれらを減圧しながら一体化した後、２０
００℃に温度を上げ線引きを行った。作製した絶対単一
偏波光ファイバは複屈折が・ＳｉＯ２、Ｐ２Ｏ５・Ｓｉ
Ｏ−３、伝送損失は波長１．５μｍにおいて１ｄＢ／ｋ
ｍであり、設計通りの値が得られた。The base materials 12^, 12B for the first intermediate layer, the base materials 13A, 13B for the second intermediate layer, and the holes 12a, 12b, 13a, 13b in the base material IO corresponding to these are surface-treated with difluoric acid before insertion. Processed. After installing the base material for the first intermediate layer and the base material for the second intermediate layer into the holes in the base material IO,
After integrating these under reduced pressure at 1500℃, 20
The temperature was raised to 00°C and wire drawing was performed. The fabricated absolutely single polarization optical fiber has birefringence of ・SiO2, P2O5・Si
O-3, transmission loss is 1dB/k at wavelength 1.5μm
m, and the value as designed was obtained.
亙凰１１
実施例１で示したコア部とクラッド部からなるコア用の
母材として、第４図に示すようにコア部の屈折率分布を
三角分布とした母材を用いた。コア直径を１ｍｍ 、第
１中間層の径を５ｍａ＋ ％第２中間層の径を１２ｎ＋
Ｉｎとし、第１中間層はコア部に接し、クラッド部に対
する比屈折率差が−０，３％のＳｉＯ２、Ｐ２Ｏ５゜０
２）第２中間層は中心がコア部の中心から９ｍｍ ｓれ
ており、クラッド部に対する比屈折率差は−０，５％の
Ｂ２Ｏ．・ＳｉＯ２、ＧｅＯ，とした。庙凰11 As the base material for the core consisting of the core part and the cladding part shown in Example 1, a base material in which the refractive index distribution of the core part was triangular as shown in FIG. 4 was used. The core diameter is 1mm, the diameter of the first intermediate layer is 5ma+, the diameter of the second intermediate layer is 12n+
In, the first intermediate layer is in contact with the core part, and is made of SiO2, P2O5°0 with a relative refractive index difference of -0.3% with respect to the cladding part.
2) The center of the second intermediate layer is spaced 9 mm from the center of the core portion, and the relative refractive index difference with respect to the cladding portion is -0.5% B2O.・SiO2 and GeO were used.
作製した絶対単一偏波光ファイバは構造不完全性による
損失が少なく伝送損失は０．５ ｄＢ／ｋｍと小さい値
であった。The fabricated absolute single polarization optical fiber had little loss due to structural imperfections, and the transmission loss was as small as 0.5 dB/km.
コア部の屈折率分布は三角分布以外に、α乗分布ｎ （
ｒ） ＝（Ｃ−奪コｒ／ａ）町ｎ＋ （１＜ａ ＜２
．△はクラッドに対するコアの比屈折率差）としてもよ
い。In addition to the triangular distribution, the refractive index distribution of the core part has an α-th power distribution n (
r) = (C-Koro r/a) town n+ (1<a <2
．． Δ may be the relative refractive index difference between the core and the cladding.
なお、本実施例についても、第１中間層の屈折率をクラ
ッド部の屈折率と等しくすることにより、コア内の電界
分布をｘ、ｙ方向で均一にすることができる。Also in this example, by making the refractive index of the first intermediate layer equal to the refractive index of the cladding portion, the electric field distribution within the core can be made uniform in the x and y directions.
［発明の効果］
以上説明したように、第１中間層用の母材としてクラッ
ドに対する比屈折率差が−０，３％以下の高濃度のフッ
素を含む５Ｉ０２ガラス、第２中間層用の母材としてク
ラッドに対する比屈折率差が−０，５％以下の高濃度の
Ｂ２Ｏ３を含むＳｉＯ２、ＧｅＯ，ガラスを用い、Ｇｅ
Ｏ２・ＳｉＯ２からなるコア部、 ＳｉＯ２、ＧｅＯ２
からなるクラッド部を持つコア用母材のクラッド部に超
音波ドリルを用いて第１中間層用の孔、第２中間層用の
孔をあけた後、火炎研磨を施し、第１中間層用の母材、
第２中間層用の母材を装着後、一体化、線引きをするこ
とにより、複屈折率が高く、光フアイバ長手方向の線径
ゆらぎの少ない光ファイバを実現できるため、構造不完
全性による損失、クロストークの劣化が少ない絶対単一
偏波光ファイバを再現性よく製造できる。[Effects of the Invention] As explained above, 5I02 glass containing a high concentration of fluorine with a relative refractive index difference of −0.3% or less with respect to the cladding is used as the base material for the first intermediate layer, and the base material for the second intermediate layer is SiO2, GeO, and glass containing a high concentration of B2O3 with a relative refractive index difference of -0.5% or less with respect to the cladding are used as materials.
Core part consisting of O2/SiO2, SiO2, GeO2
After drilling a hole for the first intermediate layer and a hole for the second intermediate layer using an ultrasonic drill in the cladding part of the base material for the core, which has a cladding part consisting of base material,
By integrating and drawing the base material for the second intermediate layer, it is possible to create an optical fiber with a high birefringence and little fluctuation in the diameter in the longitudinal direction of the optical fiber, resulting in loss due to structural imperfections. , an absolutely single polarization optical fiber with little crosstalk degradation can be manufactured with good reproducibility.
第１図は本発明の製造法を用いて作製した絶対単一偏波
光ファイバの断面図、
第２図は規格化応力付与直径とモード複屈折率との関係
を示す特性図、
第３図はコア部およびクラッド部からなるコア用の母材
に孔をあけ、第１中間層用の母材、第２中間層用の母材
を挿入する様子を示す図、第４図は三角コアの屈折率分
布を示す図、第５図は従来の絶対単一偏波光ファイバの
断面図、
第６図、第７図および第８図は従来の絶対単一偏波光フ
ァイバの作製方法を示す図である。
１・・・コア、
２．２＾、２ト・・第１中間層、
３．３八、 ３Ｄ・・・第２中間層、
４・・・クラッド、
５・・・コア用母材、
６・・・石英管、
ＩＯ・・・母材、
１２＾、 １２Ｂ・・・第１中間層用の母材、１２ａ、
１２ｂ・・・第１中間層用の孔、１３＾、 １３Ｂ・
・・第２中間層用の母材、１：ｌａ、 １３ｂ・・・第
２中間層用の孔。Figure 1 is a cross-sectional view of an absolutely single polarization optical fiber manufactured using the manufacturing method of the present invention, Figure 2 is a characteristic diagram showing the relationship between the normalized stress-applying diameter and mode birefringence, and Figure 3 is A diagram showing how a hole is made in the base material for the core consisting of the core part and the cladding part, and the base material for the first intermediate layer and the base material for the second intermediate layer are inserted. Figure 4 shows the refraction of the triangular core. Figure 5 is a cross-sectional view of a conventional absolute single polarization optical fiber; Figures 6, 7, and 8 are diagrams showing a conventional method of manufacturing an absolutely single polarization optical fiber. . DESCRIPTION OF SYMBOLS 1...Core, 2.2^, 2T...1st intermediate layer, 3.38, 3D...2nd intermediate layer, 4...Clad, 5...Base material for core, 6 ...Quartz tube, IO...Base material, 12^, 12B...Base material for first intermediate layer, 12a,
12b... hole for first intermediate layer, 13^, 13B.
... Base material for second intermediate layer, 1:la, 13b... Hole for second intermediate layer.
Claims (1)
側に設けた２個の第１中間層と、該２個の第１中間層の
配列方向と直角方向 にかつそれぞれ前記コアから離れかつ該コアを挟んで設
けた２個の第２中間層とからなることを特徴とする絶対
単一偏波光ファイバ。 ２）特許請求の範囲第１項記載の絶対単一偏波光ファイ
バにおいて、前記コアがＧｅＯ＿２・ＳｉＯ＿２であり
、前記第１中間層がＦ・ＳｉＯ＿２であり、かつ前記第
２中間層がＢ＿２Ｏ＿３・ＳｉＯ＿２であって、第１中
間層のクラッドに対する比屈折率差が−０．３％以下、
第２中間層のクラッドに対する比屈折率差が−０．５％
以下であることを特徴とする絶対単一偏波光ファイバ。 ３）特許請求の範囲第１項記載の絶対単一偏波光ファイ
バにおいて、前記コアがＧｅＯ＿２・ＳｉＯ＿２、Ｇｅ
Ｏ＿２・Ｐ＿２Ｏ＿５・ＳｉＯ＿２、Ｐ＿２Ｏ＿５・Ｓ
ｉＯ＿２およびＡｌ＿２Ｏ＿３・ＳｉＯ＿２のうちの一
種であり、前記第２中間層がＢ＿２Ｏ＿３・ＳｉＯ＿２
、Ｂ＿２Ｏ＿３・Ｐ＿２Ｏ＿５・ＳｉＯ＿２、Ｂ＿２Ｏ
＿３・Ｐ＿２Ｏ＿５・Ａｌ＿２Ｏ＿３・ＳｉＯ＿２、Ｂ
＿２Ｏ＿３・Ａｌ＿２Ｏ＿３・ＳｉＯ＿２、Ｂ＿２Ｏ＿
３・Ｆ・ＳｉＯ＿２、Ｐ＿２Ｏ＿５・Ｆ・ＳｉＯ＿２、
Ａｌ＿２Ｏ＿３・Ｆ・ＳｉＯ＿２およびＧｅＯ＿２・Ｂ
＿２Ｏ＿３・ＳｉＯ＿２のうちの一種であることを特徴
とする絶対単一偏波光ファイバ。 ４）線引き後それぞれコアおよびクラッドとなるコア部
およびクラッド部を有する母材に、前記コア部に接しか
つ該コア部の直径方向反対側にそれぞれ第１中間層用の
孔を、該２個の孔の中心を結ぶ方向と直角方向で、前記
コア部を挟む位置にそれぞれ第２中間層用の孔を開け、
前記それぞれ２個の第１中間層用の孔および第２中間層
の孔にそれぞれ第１中間層用母材および第２中間層用母
材を挿入して一体化し、 線引きして光ファイバとすることを特徴とする絶対単一
偏波光ファイバの製造方法。 ５）特許請求の範囲第４項記載の絶対単一偏波光ファイ
バの製造方法において、前記孔あけが超音波ドリルによ
る穿孔であることを特徴とする絶対単一偏波光ファイバ
の製造方法。 ６）特許請求の範囲第４項または第５項に記載の絶対単
一偏波光ファイバの製造方法において、コア母材として
ＧｅＯ＿２・ＳｉＯ＿２、前記第１中間層用母材として
Ｆ・ＳｉＯ＿２、前記第２中間層用母材としてＢ＿２Ｏ
＿３・ＳｉＯ＿２を用い、第１中間層のクラッドに対す
る比屈折率差が−０．３％以下、第２中間層のクラッド
に対する比屈折率差が−０．５％以下であることを特徴
とする絶対単一偏波光ファイバの製造方法。 ７）特許請求の範囲第４項または第５項に記載の絶対単
一偏波光ファイバの製造方法において、コア母材として
ＧｅＯ＿２・ＳｉＯ＿２、ＧｅＯ＿２・Ｐ＿２Ｏ＿５・
ＳｉＯ＿２、Ｐ＿２Ｏ＿５・ＳｉＯ＿２およびＡｌ＿２
Ｏ＿３・ＳｉＯ＿２のうちの一種を用い、前記第２中間
層用母材としてＢ＿２Ｏ＿３・ＳｉＯ＿２、Ｂ＿２Ｏ＿
３・Ｐ＿２Ｏ＿５・ＳｉＯ＿２、Ｂ＿２Ｏ＿３・Ｐ＿２
Ｏ＿５・Ａｌ＿２Ｏ＿３・ＳｉＯ＿２、Ｂ＿２Ｏ＿３・
Ａｌ＿２Ｏ＿３・ＳｉＯ＿２、Ｂ＿２Ｏ＿３・Ｆ・Ｓｉ
Ｏ＿２、Ｐ＿２Ｏ＿５・Ｆ・ＳｉＯ＿２、Ａｌ＿２Ｏ＿
３・Ｆ・ＳｉＯ＿２およびＧｅＯ＿２・Ｂ＿２Ｏ＿３・
ＳｉＯ＿２のうちの一種を用いることを特徴とする絶対
単一偏波光ファイバの製造方法。[Claims] 1) A cladding, a core located at the center of the cladding, two first intermediate layers each in contact with the core and provided on diametrically opposite sides of the core; 1. An absolutely single polarization optical fiber comprising two second intermediate layers provided in a direction perpendicular to the arrangement direction of the first intermediate layer, separated from the core, and sandwiching the core. 2) In the absolute single polarization optical fiber according to claim 1, the core is GeO_2.SiO_2, the first intermediate layer is F.SiO_2, and the second intermediate layer is B_2O_3.SiO_2. and the relative refractive index difference of the first intermediate layer with respect to the cladding is -0.3% or less,
The relative refractive index difference of the second intermediate layer with respect to the cladding is -0.5%
An absolutely single polarization optical fiber characterized by: 3) In the absolute single polarization optical fiber according to claim 1, the core is made of GeO_2・SiO_2, Ge
O_2・P_2O_5・SiO_2, P_2O_5・S
iO_2 and Al_2O_3・SiO_2, and the second intermediate layer is B_2O_3・SiO_2.
, B_2O_3・P_2O_5・SiO_2, B_2O
_3・P_2O_5・Al_2O_3・SiO_2, B
_2O_3・Al_2O_3・SiO_2, B_2O_
3.F.SiO_2, P_2O_5.F.SiO_2,
Al_2O_3・F・SiO_2 and GeO_2・B
An absolutely single polarization optical fiber characterized by being one of _2O_3 and SiO_2. 4) A hole for the first intermediate layer is provided in the base material having a core part and a clad part, which will become the core and clad respectively after wire drawing, in contact with the core part and on the opposite side in the diametrical direction of the core part. Drilling holes for the second intermediate layer at positions sandwiching the core portion in a direction perpendicular to the direction connecting the centers of the holes,
A first intermediate layer base material and a second intermediate layer base material are inserted into each of the two holes for the first intermediate layer and the hole for the second intermediate layer, and are integrated, and then drawn to form an optical fiber. A method of manufacturing an absolutely single polarization optical fiber, characterized by: 5) The method for manufacturing an absolutely single polarized optical fiber according to claim 4, characterized in that the drilling is performed using an ultrasonic drill. 6) In the method for manufacturing an absolutely single polarized optical fiber according to claim 4 or 5, the core base material is GeO_2.SiO_2, the first intermediate layer base material is F.SiO_2, and the first intermediate layer base material is F.SiO_2. 2 B_2O as the base material for the intermediate layer
_3.SiO_2 is used, and the first intermediate layer has a relative refractive index difference of -0.3% or less with respect to the cladding, and the second intermediate layer has a relative refractive index difference of -0.5% or less with respect to the cladding. A method for manufacturing absolutely single polarization optical fiber. 7) In the method for manufacturing an absolutely single polarization optical fiber according to claim 4 or 5, GeO_2.SiO_2, GeO_2.P_2O_5.
SiO_2, P_2O_5・SiO_2 and Al_2
One type of O_3.SiO_2 is used as the base material for the second intermediate layer, B_2O_3.SiO_2, B_2O_
3・P_2O_5・SiO_2, B_2O_3・P_2
O_5・Al_2O_3・SiO_2, B_2O_3・
Al_2O_3・SiO_2, B_2O_3・F・Si
O_2, P_2O_5・F・SiO_2, Al_2O_
3.F.SiO_2 and GeO_2.B_2O_3.
A method for manufacturing an absolutely single polarization optical fiber, characterized by using one type of SiO_2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62039231A JPS63206710A (en) | 1987-02-24 | 1987-02-24 | Absolute single polarization optical fiber and its production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62039231A JPS63206710A (en) | 1987-02-24 | 1987-02-24 | Absolute single polarization optical fiber and its production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63206710A true JPS63206710A (en) | 1988-08-26 |
Family
ID=12547351
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62039231A Pending JPS63206710A (en) | 1987-02-24 | 1987-02-24 | Absolute single polarization optical fiber and its production |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63206710A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6687442B2 (en) | 2001-01-17 | 2004-02-03 | Fujikura Ltd. | Optical fiber for preserving plane of polarization |
| JP2011237796A (en) * | 2010-04-30 | 2011-11-24 | Corning Inc | Optical fiber with differential birefringence mechanism |
-
1987
- 1987-02-24 JP JP62039231A patent/JPS63206710A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6687442B2 (en) | 2001-01-17 | 2004-02-03 | Fujikura Ltd. | Optical fiber for preserving plane of polarization |
| JP2011237796A (en) * | 2010-04-30 | 2011-11-24 | Corning Inc | Optical fiber with differential birefringence mechanism |
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