JPH0211527B2 - - Google Patents
Info
- Publication number
- JPH0211527B2 JPH0211527B2 JP57160845A JP16084582A JPH0211527B2 JP H0211527 B2 JPH0211527 B2 JP H0211527B2 JP 57160845 A JP57160845 A JP 57160845A JP 16084582 A JP16084582 A JP 16084582A JP H0211527 B2 JPH0211527 B2 JP H0211527B2
- Authority
- JP
- Japan
- Prior art keywords
- quartz tube
- fiber
- core
- optical fiber
- glass rod
- 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.)
- Expired - Lifetime
Links
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 30
- 239000010453 quartz Substances 0.000 claims description 27
- 239000000835 fiber Substances 0.000 claims description 21
- 230000010287 polarization Effects 0.000 claims description 14
- 239000013307 optical fiber Substances 0.000 claims description 11
- 239000011521 glass Substances 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000009987 spinning Methods 0.000 claims description 3
- 238000005553 drilling Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims 1
- 230000002093 peripheral effect Effects 0.000 description 6
- 239000002131 composite material Substances 0.000 description 5
- 239000012535 impurity Substances 0.000 description 4
- 230000010354 integration Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 1
- 229910005793 GeO 2 Inorganic materials 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000007524 flame polishing Methods 0.000 description 1
- 229960002050 hydrofluoric acid Drugs 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
- C03B37/01211—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments by inserting one or more rods or tubes into a tube
- C03B37/01217—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments by inserting one or more rods or tubes into a tube for making preforms of polarisation-maintaining optical fibres
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2203/00—Fibre product details, e.g. structure, shape
- C03B2203/30—Polarisation maintaining [PM], i.e. birefringent products, e.g. with elliptical core, by use of stress rods, "PANDA" type fibres
Description
【発明の詳細な説明】
本発明は偏波特性を保持する定偏波フアイバの
製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a polarization constant fiber that maintains polarization characteristics.
偏波特性を保持する定偏波フアイバは光フアイ
バセンサ・コヒーレント通信等への応用が可能な
ことから、その開発が望まれている。この定偏波
フアイバとして従来○イ楕円コアフアイバ○ロ楕円ク
ラツドフアイバ○ハサイドピツト型フアイバ等が提
案されている。このなかで○ハのサイドピツト型フ
アイバはコアの両側にピツトと称される低屈折率
部分を設けて、偏波特性を保持するようにしたも
のである。このサイドピツト型フアイバは互いに
直交するHE11モードに対して各々異なる遮断周
波数をもつため、いずれか一方のHE11モードの
みが伝播可能な絶体単一偏波帯域を有し、また複
屈折率フアイバとしてもかなり良好な特性を示
す。しかしそれでも、これらの特性は実用的には
満足すべきものではなかつた。更に、このサイド
ピツト型フアイバはピツトを低屈折率にするため
不純物を大量にドープしなければならず、伝播損
失が大きくなるという欠点がある。 The development of polarization-constant fibers that maintain polarization characteristics is desired because they can be applied to optical fiber sensors, coherent communications, etc. Conventionally, various types of polarization-constant fibers have been proposed, such as elliptical core fiber, elliptic cladding fiber, and side-pit type fiber. Among these, the side pit type fiber shown in ○C has low refractive index portions called pits on both sides of the core to maintain polarization characteristics. This side-pit type fiber has different cutoff frequencies for the HE 11 modes that are orthogonal to each other, so it has an absolutely single polarization band in which only one HE 11 mode can propagate. However, it shows quite good characteristics. However, these characteristics were still not satisfactory in practical terms. Furthermore, this side-pit type fiber has the disadvantage that a large amount of impurity must be doped in order to make the pit a low refractive index, which increases propagation loss.
本発明はコアの両側に不純物をドープして屈折
率の低いピツトを形成する代りに、該ピツトに相
当する部分を中空とすることにより上記不具合を
解消した、いわばサイドトンネル型とも言うべき
定偏波フアイバの製造方法の提供を目的とするも
のであつて、その構成は石英管の外周面に軸対称
に相対向する側溝を穿設した後、該石英管にコア
となるガラスロツドを挿入し、更に該石英管の外
周面に重ねて石英管を外嵌し、これらを加熱一体
化した後に紡糸してコアの両側に中空部を有する
光フアイバを製造することを特徴とする。 The present invention solves the above-mentioned problems by doping impurities on both sides of the core to form pits with a low refractive index, but by making the portions corresponding to the pits hollow, which can be called a side tunnel type. The purpose of the present invention is to provide a method for manufacturing a wave fiber, which consists of: drilling side grooves that face each other axially symmetrically on the outer peripheral surface of a quartz tube, then inserting a glass rod serving as a core into the quartz tube; Furthermore, a quartz tube is fitted onto the outer peripheral surface of the quartz tube, heated and integrated, and then spun to produce an optical fiber having hollow portions on both sides of the core.
以下に、本発明の定偏波フアイバを実施例に基
づいて詳細に説明する。 EMBODIMENT OF THE INVENTION Below, the polarization constant fiber of this invention is demonstrated in detail based on an Example.
まず、本発明では第１図に示される石英管１の
外周面に軸対称に相対向する側溝２ａ，２ｂをみ
ぞ切り加工する（第２図参照）。加工後の表面に
は、フアイバの伝送損失、フアイバの引張り強度
を考慮するとフツ酸エツチング、火炎研摩等を施
すことが望ましい。引き続き第３図に示されるよ
うに該石英管１にコアとなるガラスロツド３を挿
入する。該ガラスロツド３は本実施例では添加元
素のドープされたものとなつているが、石英管１
が添加元素のドープされたものである場合には石
英ガラスでも良い。次に、これら石英管１及びガ
ラスロツド３を外部から高温加熱し一体化する。
このとき一体化を容易にするために管内部を減圧
状態にしておくとよい。一体化して得られた複合
ロツドには石英管の側溝２ａ，２ｂがガラスロツ
ド３の両側に中空部として残る。このような複合
ロツドの外周面に更に石英管４を外嵌し、これら
を外部から高温に加熱し一体化する（第５図参
照）。この石英管４の管厚を適宜選択すれば所望
の外径：コア径の比を得ることが可能である。更
に一体化して得られたプリフオームをカーボン抵
抗炉等を用いて0.1〜0.15mm程度に紡糸し第６図
に示されるコアの両側に中空部、即ちピツト５
ａ，５ｂを有する光フアイバ６を得る。この場
合、紡糸前はコアとなるガラスロツド３の断面形
状は円形であるが紡糸後は第６図に示されるよう
な楕円形となり、その両側には中空のピツト５
ａ，５ｂが形成されるので、光フアイバ６は非軸
対称の屈折率分布を有することとなる。 First, in the present invention, side grooves 2a and 2b which are axially symmetrically opposed to each other are cut into the outer peripheral surface of the quartz tube 1 shown in FIG. 1 (see FIG. 2). The surface after processing is preferably subjected to fluoric acid etching, flame polishing, etc. in consideration of fiber transmission loss and fiber tensile strength. Subsequently, as shown in FIG. 3, a glass rod 3 serving as a core is inserted into the quartz tube 1. In this embodiment, the glass rod 3 is doped with an additive element, but the quartz tube 1
If it is doped with an additive element, quartz glass may be used. Next, the quartz tube 1 and the glass rod 3 are heated to a high temperature from the outside and are integrated.
At this time, in order to facilitate integration, it is preferable to keep the inside of the tube in a reduced pressure state. In the integrated composite rod, side grooves 2a and 2b of the quartz tube remain as hollow parts on both sides of the glass rod 3. A quartz tube 4 is further fitted onto the outer peripheral surface of such a composite rod, and these are heated from the outside to a high temperature to integrate them (see FIG. 5). By appropriately selecting the thickness of the quartz tube 4, it is possible to obtain a desired outer diameter:core diameter ratio. Furthermore, the preform obtained by the integration is spun to a thickness of approximately 0.1 to 0.15 mm using a carbon resistance furnace, etc., and hollow portions, that is, pits 5 are formed on both sides of the core as shown in FIG.
An optical fiber 6 having fibers a and 5b is obtained. In this case, the cross-sectional shape of the glass rod 3 serving as the core is circular before spinning, but after spinning it becomes an ellipse as shown in Figure 6, with hollow pits 5 on both sides.
a, 5b are formed, the optical fiber 6 has a non-axisymmetric refractive index distribution.
従つて、上記構成を有する本発明方法により製
造された光フアイバ６は偏波特性を保持できると
共に前述した絶体単一偏波帯域を有し、複屈折率
フアイバとしても好適である。しかも、ピツト５
ａ，５ｂは中空であり従前の不純物のドープされ
たピツトに比べ極めて小さな空気の屈折率１を有
するので、このような効果は一層向上する。更
に、不純物がドープされていないので伝送損失が
小さいという効果もある。 Therefore, the optical fiber 6 manufactured by the method of the present invention having the above configuration can maintain polarization characteristics and has the above-mentioned absolutely single polarization band, and is suitable as a birefringence fiber. Moreover, Pituto 5
Since a and 5b are hollow and have an air refractive index of 1 which is extremely small compared to the conventional pit doped with impurities, this effect is further improved. Furthermore, since it is not doped with impurities, it has the effect of reducing transmission loss.
次に実施例を示す。 Next, examples will be shown.
外径26mmφ、肉厚８mmｔの石英管の外周面に軸
対称に向い合わせて深さ6.5mm、幅10mmの側溝を
研削加工した。その後、この石英管に12ωt％
GeO2を含有する石英ガラスロツドを挿入した。
次いで、この石英管及び石英ガラスロツドを
H2／O2炎を用いて1900℃に加熱し一体化した。
この時石英管内の圧力を400mmHgに減圧していた
ので、一体化が容易であつた。一体化して得られ
た複合ロツドの外周面に更に外径29mmφ、肉厚８
mmｔの石英管を外嵌し、これらをH2／O2炎で外
部より加熱し一体化した。このようにして得られ
たプリフオームを約2100℃の温度でカーボン抵抗
炉を用いて加熱し外径110μｍの光フアイバを紡
糸した。この光フアイバにはコアの両側に中空な
ピツトが形成されており、この光フアイバの偏波
特性をλ＝1.15μｍの光で評価したところ複屈折
率は10-4以上と大きく、また１Kmのフアイバを伝
播した後の消失比は−25dB以下と良好であつた。 Side grooves with a depth of 6.5 mm and a width of 10 mm were ground on the outer peripheral surface of a quartz tube with an outer diameter of 26 mmφ and a wall thickness of 8 mm, facing axially symmetrically. After that, 12ωt% was applied to this quartz tube.
A quartz glass rod containing GeO 2 was inserted.
Next, this quartz tube and quartz glass rod are
They were heated to 1900°C using a H 2 /O 2 flame and integrated.
At this time, the pressure inside the quartz tube was reduced to 400 mmHg, so integration was easy. Further, on the outer peripheral surface of the composite rod obtained by integrating, an outer diameter of 29 mmφ and a wall thickness of 8
A mmt quartz tube was fitted onto the outside, and these were heated from the outside with a H 2 /O 2 flame to integrate them. The thus obtained preform was heated at a temperature of about 2100° C. using a carbon resistance furnace and an optical fiber having an outer diameter of 110 μm was spun. This optical fiber has hollow pits formed on both sides of the core, and when the polarization characteristics of this optical fiber were evaluated with light of λ = 1.15 μm, the birefringence was as large as 10 -4 or more, and the birefringence was as high as 1 km. The extinction ratio after propagation through the fiber was good, less than -25 dB.
以上、実施例に基づいて具体的に説明したよう
に本発明の定偏波フアイバの製造方法によれば、
偏波特性を保持でき、しかも絶体単一偏波帯域の
広い、複屈折率の特性の優れた定偏波フアイバを
製造することができる。 As described above in detail based on the embodiments, according to the method for manufacturing a constant polarization fiber of the present invention,
It is possible to manufacture a polarization constant fiber that can maintain polarization characteristics, has a wide absolute single polarization band, and has excellent birefringence characteristics.
第１図〜第６図は本発明に係り、第１図は石英
管の断面図、第２図は側溝の穿設された石英管の
断面図、第３図は石英管及び石英管に挿入された
ガラスロツドの断面図、第４図は石英管及びガラ
スロツドの一体化した複合ロツドの断面図、第５
図は複合ロツド及び石英管の一体化したプリフオ
ームの断面図、第６図は紡糸された光フアイバの
断面図である。
図面中、１，４は石英管、２ａ，２ｂは側溝、
３はガラスロツド、５ａ，５ｂはピツト、６は光
フアイバである。
Figures 1 to 6 relate to the present invention, Figure 1 is a sectional view of a quartz tube, Figure 2 is a sectional view of a quartz tube with a side groove, and Figure 3 is a quartz tube and a quartz tube inserted into the tube. Fig. 4 is a cross-sectional view of a composite rod in which a quartz tube and a glass rod are integrated.
The figure is a cross-sectional view of a preform with an integrated composite rod and quartz tube, and FIG. 6 is a cross-sectional view of a spun optical fiber. In the drawing, 1 and 4 are quartz tubes, 2a and 2b are side gutters,
3 is a glass rod, 5a and 5b are pits, and 6 is an optical fiber.
Claims (1)
穿設した後、該石英管にコアとなるガラスロツド
を挿入し、更に該石英管の外周面に重ねて石英管
を外嵌し、これらを加熱一体化した後に紡糸して
コアの両側に中空部を有する光フアイバを製造す
ることを特徴とする定偏波フアイバの製造方法。1. After drilling side grooves that face each other axially symmetrically on the outer circumferential surface of the quartz tube, insert a glass rod to serve as the core into the quartz tube, and then fit the quartz tube overlappingly on the outer circumferential surface of the quartz tube. 1. A method for producing a constant polarization fiber, which comprises heating and unifying the fibers, and then spinning the fibers to produce an optical fiber having hollow portions on both sides of the core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57160845A JPS5950043A (en) | 1982-09-17 | 1982-09-17 | Production of constant polarization fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57160845A JPS5950043A (en) | 1982-09-17 | 1982-09-17 | Production of constant polarization fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5950043A JPS5950043A (en) | 1984-03-22 |
| JPH0211527B2 true JPH0211527B2 (en) | 1990-03-14 |
Family
ID=15723645
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57160845A Granted JPS5950043A (en) | 1982-09-17 | 1982-09-17 | Production of constant polarization fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5950043A (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2631552B2 (en) * | 1989-04-17 | 1997-07-16 | 富士写真フイルム株式会社 | Color developing agent and image forming method |
| FR2655326B1 (en) * | 1989-12-01 | 1992-02-21 | Thomson Csf | METHOD FOR PRODUCING A HOLLOW OPTICAL FIBER AND DEVICE FOR PRODUCING A HOLLOW OPTICAL FIBER. |
| US5152818A (en) * | 1990-11-09 | 1992-10-06 | Corning Incorporated | Method of making polarization retaining fiber |
| US5149349A (en) * | 1991-07-11 | 1992-09-22 | Corning Incorporated | Method of making polarization retaining fiber with an elliptical core, with collapsed apertures |
| WO2002072489A2 (en) * | 2001-03-09 | 2002-09-19 | Crystal Fibre A/S | Fabrication of microstructured fibres |
| CN100388030C (en) * | 2003-06-19 | 2008-05-14 | 康宁股份有限公司 | Single polarization optical fiber and system and method for producing same |
| US7200309B2 (en) | 2003-06-19 | 2007-04-03 | Corning Incorporated | Single polarization and polarization maintaining optical fibers and system utilizing same |
| US7280728B2 (en) * | 2004-10-22 | 2007-10-09 | Corning Incorporated | Rare earth doped single polarization double clad optical fiber with plurality of air holes |
| JP2009149470A (en) * | 2007-12-20 | 2009-07-09 | Nippon Telegr & Teleph Corp <Ntt> | Preform for optical fiber and its manufacturing method |
-
1982
- 1982-09-17 JP JP57160845A patent/JPS5950043A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5950043A (en) | 1984-03-22 |
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