JPS6245184B2 - - Google Patents
Info
- Publication number
- JPS6245184B2 JPS6245184B2 JP59064807A JP6480784A JPS6245184B2 JP S6245184 B2 JPS6245184 B2 JP S6245184B2 JP 59064807 A JP59064807 A JP 59064807A JP 6480784 A JP6480784 A JP 6480784A JP S6245184 B2 JPS6245184 B2 JP S6245184B2
- Authority
- JP
- Japan
- Prior art keywords
- spinning
- fiber
- coloration
- loss
- seconds
- 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
Links
- 239000000835 fiber Substances 0.000 claims description 23
- 238000010438 heat treatment Methods 0.000 claims description 20
- 238000009987 spinning Methods 0.000 claims description 15
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 239000013307 optical fiber Substances 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 2
- 230000003287 optical effect Effects 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000006223 plastic coating Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000007847 structural defect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/06—Glass compositions containing silica with more than 90% silica by weight, e.g. quartz
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C13/00—Fibre or filament compositions
- C03C13/04—Fibre optics, e.g. core and clad fibre compositions
- C03C13/045—Silica-containing oxide glass compositions
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C2201/00—Glass compositions
- C03C2201/06—Doped silica-based glasses
- C03C2201/20—Doped silica-based glasses containing non-metals other than boron or halide
- C03C2201/23—Doped silica-based glasses containing non-metals other than boron or halide containing hydroxyl groups
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C2201/00—Glass compositions
- C03C2201/06—Doped silica-based glasses
- C03C2201/20—Doped silica-based glasses containing non-metals other than boron or halide
- C03C2201/28—Doped silica-based glasses containing non-metals other than boron or halide containing phosphorus
Landscapes
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Surface Treatment Of Glass Fibres Or Filaments (AREA)
- Glass Compositions (AREA)
Description
【発明の詳細な説明】
この発明は、コアにＰを含む光フアイバの製造
方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an optical fiber containing P in its core.
発明の背景
光通信用フアイバのコアには、現在、Geおよ
びＰをドープした石英が多く使われている。BACKGROUND OF THE INVENTION Currently, Ge- and P-doped quartz is often used for the core of optical communication fibers.
これらのうち、材料固有の損失（不純物や構造
不完全にもとづく伝送損失を引いた後の損失）
は、Ｐドープの方が、Geドープよりも小さい。 Of these, material-specific losses (losses after subtracting transmission losses due to impurities and structural imperfections)
is smaller for P-doped than for Ge-doped.
ところが、Ｐドープの石英ガラスをコアとする
フアイバには、カラレーシヨンの問題がある。 However, fibers having a core of P-doped silica glass have coloration problems.
それは、紡糸直後のフアイバに、ほとんど例外
なく、紫外〜可視光線〜近赤外の範囲に大きな吸
収損失が発生するという問題である。 The problem is that, almost without exception, large absorption losses occur in the fiber immediately after spinning in the ultraviolet to visible light to near-infrared range.
なお、この問題は、Geドープの場合、ほとん
ど発生しない。 Note that this problem hardly occurs in the case of Ge doping.
このカラレーシヨン現象は、コア中のOH含有
量に大きく影響される。OHにより波長0.95μｍ
などで吸収損失が生ずるのは知られているが、そ
のその吸収損失を小さくするためにOHを少なく
すると、カラレーシヨンが大になる。 This coloration phenomenon is greatly influenced by the OH content in the core. Wavelength 0.95μm due to OH
It is known that absorption loss occurs in such cases, but if OH is reduced in order to reduce the absorption loss, coloration increases.
たとえばＰドープト石英ガラスをコアとするフ
アイバに、OHを20ppm入れたものは、紡糸直
後、波長0.53μｍを中心として、ピーク値約
40dB／Kmの損失（カラレーシヨン）があるが、
これを室温で２箇月間放置すると、ほとんど観測
されなくなる（ただし0.95μｍなどでの損失値は
不変）。これに対して、同じＰドープトフアイバ
でも、低OHのものは、紡糸直後の波長0.53μｍ
の損失が、上記の倍の80dB／Kmくらいもあり、
室温に２箇月間放置した後も、あまり減少しな
い。 For example, a fiber with a P-doped quartz glass core containing 20 ppm of OH has a peak value of about 0.53 μm immediately after spinning.
There is a loss (coloration) of 40dB/Km, but
If this is left at room temperature for two months, it will hardly be observed (however, the loss value at 0.95 μm etc. will remain unchanged). On the other hand, even with the same P-doped fiber, the one with low OH has a wavelength of 0.53 μm immediately after spinning.
The loss is about 80dB/Km, which is twice the above.
It does not decrease much even after being left at room temperature for two months.
発明の目的
上記のカラレーシヨンが、紡糸後のフアイバを
熱処理することによつて、容易に低減できること
が分つた。OBJECTS OF THE INVENTION It has been found that the coloration described above can be easily reduced by heat treating the fiber after spinning.
この発明は、この自然現象に対する新しい認識
にもとづき、低OHであつて、しかも可視域でも
低損失の、Ｐドープトフアイバの製造方法を提供
することを目的とするものである。 The present invention is based on a new understanding of this natural phenomenon, and an object of the present invention is to provide a method for producing a P-doped fiber that has low OH and low loss even in the visible range.
発明の構成
Ｐを含むコアを持つ光フアイバの製造におい
て、フアイバを紡糸し、かつプライマリコートを
施した直後に、フアイバを350〜500℃で、２〜10
秒間、加熱することを特徴とする。Structure of the Invention In manufacturing an optical fiber having a core containing P, immediately after spinning the fiber and applying a primary coat, the fiber is heated at 350 to 500°C for 2 to 10 minutes.
It is characterized by heating for a few seconds.
その詳しい説明
コアにＰを含むフアイバは、紡糸工程でガラス
に加えられる高熱により、ガラス構造に欠陥を生
じやすい。これは他の添加物よりも激しい。Detailed Description Fibers containing P in their cores are susceptible to defects in the glass structure due to the high heat applied to the glass during the spinning process. This is more intense than other additives.
カラレーシヨンは、この構造欠陥によるものと
考えられるが、上記のように紡糸後、適切な熱処
理を程こすと、欠陥が不活性化して、カラレーシ
ヨンがほとんどなくなるものと思われる。 It is thought that the coloration is caused by this structural defect, but if an appropriate heat treatment is applied after spinning as described above, the defect is inactivated and the coloration is thought to be almost eliminated.
今までもＰドープトフアイバのケーブル化工程
中に、カラレーシヨンが低減することが知られて
いた。これは、プライマリーコーテイング、プラ
スチツク被覆の押出しおよびシースの各工程で受
ける熱によると考えられるが、これらだけでは不
十分である。 Until now, it has been known that coloration is reduced during the process of converting P-doped fibers into cables. This is believed to be due to the heat received during the primary coating, extrusion of the plastic coating, and sheathing steps, but these alone are not sufficient.
そこで、フアイバを紡糸し、プライマリーコー
トを施した直後に、ごく短時間、プライマリーコ
ートがいたまないていどに加熱してやるものであ
る。 Therefore, immediately after the fiber is spun and a primary coat is applied, it is heated for a very short period of time to avoid damaging the primary coat.
第１図に紡糸と加熱とを連続して行なう装置の
概略を示した。 FIG. 1 schematically shows an apparatus for continuously performing spinning and heating.
１０が母材、１２は紡糸用加熱炉、１４がフア
イバ、１６がプライマリーコート用押出し機、１
８が熱処理用加熱炉、２０が巻きとりドラムであ
る。 10 is a base material, 12 is a heating furnace for spinning, 14 is a fiber, 16 is an extruder for primary coating, 1
8 is a heating furnace for heat treatment, and 20 is a winding drum.
加熱炉１８の長さＬは、紡糸スピードと加熱時
間できまる。たとえば、スピードが10ｍ／秒のと
き、約10秒加熱するには、Ｌを1.6ｍにすればよ
い。10秒ていどの短時間のときは、400℃くらい
に加熱しても、プライマリーコートはいたまな
い。そしてその後、室温中に、たとえば３日間放
置することにより、カラレーシヨンをほとんどな
くすることができる。 The length L of the heating furnace 18 is determined by the spinning speed and heating time. For example, when the speed is 10 m/sec, L should be 1.6 m to heat for about 10 seconds. Even if you heat it to about 400℃ for a short time of 10 seconds, the primary coat will not be damaged. Thereafter, coloration can be almost completely eliminated by leaving it at room temperature for, for example, 3 days.
加熱は、350〜500℃で２〜10秒間の範囲が、特
に効果が著しい。 Heating at 350 to 500°C for 2 to 10 seconds is particularly effective.
実施例
MCVD法で作つた母材から、第１図の装置に
よりフアイバ１４を紡糸し、かつプライマリーコ
ートを施した。その断面を第２図に示す。Example A fiber 14 was spun using the apparatus shown in FIG. 1 from a base material made by the MCVD method, and a primary coat was applied thereto. Its cross section is shown in FIG.
●コア１４０はSiO2＋P2O5（5mol％）、 ●クラツド１４２はSiO2＋B2O3、 ●ジヤケツト１４４はSiO2、 ●各屈折率は、第２図の下に示すとおり、 ●伝送損失は3dB／Km（at0.85μｍ）、 ●コア中のOH量は約１％、 である。●Core 140 is SiO 2 +P 2 O 5 (5mol%), ●Clad 142 is SiO 2 +B 2 O 3 , ●Jacket 144 is SiO 2 , ●Each refractive index is as shown at the bottom of Figure 2, ●Transmission The loss is 3dB/Km (at 0.85μm), ●The amount of OH in the core is approximately 1%.
加熱炉１８の度をかけないときは、紡糸直後
の、波長0.53μｍにおける損失が100dB／Kmであ
つた。しかし長さＬが１ｍ、温度が400℃の炉１
８のなかを10ｍ／minのスピードでフアイバ１４
を通過させたところ、紡糸直後の損失（at0.53μ
ｍ）は70dB／Kmであつたが、３日後には、ほと
んどゼロになつていた。 When the heating furnace 18 was not heated, the loss at a wavelength of 0.53 μm immediately after spinning was 100 dB/Km. However, the length L is 1m and the temperature is 400℃.
8 at a speed of 10m/min.
The loss immediately after spinning (at0.53μ
m) was 70 dB/Km, but after three days it had become almost zero.
次に、第３図に、加熱炉１８の温度と加熱時間
とを変えた場合を、横軸に紡糸後の放置日数（室
温）、縦軸に吸収損失（at0.53μｍ）をとつて示
した。 Next, Fig. 3 shows the case where the temperature and heating time of the heating furnace 18 are changed, with the horizontal axis representing the number of days left after spinning (room temperature) and the vertical axis representing the absorption loss (at 0.53 μm). .
●曲線Ｋは熱処理しない場合、 ●曲線Ｌは280℃で12秒間加熱した場合、 ●曲線Ｍは350℃で10秒間加熱した場合、 ●曲線Ｎは500℃で２秒間加熱した場合、 ●曲線Ｑは400℃で６秒間加熱した場合、 ●曲線Ｒは500℃で10秒間加熱した場合、 である。●Curve K is when no heat treatment is applied. ●Curve L is when heated at 280℃ for 12 seconds. ●Curve M is when heated at 350℃ for 10 seconds. ●Curve N is when heated at 500℃ for 2 seconds. ●Curve Q is when heated at 400℃ for 6 seconds. ●Curve R is when heated at 500℃ for 10 seconds. It is.
350〜500℃の温度による２〜10秒間ていどの熱
処理で、カラレーシヨンをなくせることが、よく
分る。 It is clear that any heat treatment at a temperature of 350 to 500°C for 2 to 10 seconds can eliminate coloration.
発明の効果
この発明は、コアにＰを含みかつ低OHのフア
イバに起るカラレーシヨン現象が、紡糸後の熱処
理によつて、容易に低減することができる、とい
う自然現象に対する新しい認識にもとづいて、行
なわれたものである。Effects of the Invention This invention is based on a new recognition of the natural phenomenon that the coloration phenomenon that occurs in fibers containing P in the core and having low OH can be easily reduced by heat treatment after spinning. It was done.
この発明により、低OHであつて、カラレーシ
ヨンのほとんどない、コアにＰを含むフアイバを
製造できるようになる。 This invention makes it possible to produce a fiber containing P in its core, which has low OH and almost no coloration.
また初めに述べたように、Ｐを含むフアイバは
Geを含むものよりも、元来、低損失である。 Also, as mentioned at the beginning, fibers containing P
It inherently has lower loss than those containing Ge.
したがつて、特に、可視領域およびその付近に
おいて非常に低損失のフアイバが得られる。 A fiber with very low loss is thus obtained, especially in and near the visible region.
また、熱処理は、350〜500℃の温度で２〜10秒
間行なうのであるから、プライマリーコートをだ
めにする心配がない。 Further, since the heat treatment is performed at a temperature of 350 to 500°C for 2 to 10 seconds, there is no fear of damaging the primary coat.
第１図は本発明の実施例の説明図、第２図は実
験に使つたフイバの断面と屈折率の説明図、第３
図は実施例における加熱時間−損失の特性線図。
１０：母材、１４：フアイバ、１８：熱処理用
加熱炉。
Fig. 1 is an explanatory diagram of the embodiment of the present invention, Fig. 2 is an explanatory diagram of the cross section and refractive index of the fiber used in the experiment, and Fig. 3 is an explanatory diagram of the embodiment of the present invention.
The figure is a characteristic diagram of heating time vs. loss in an example. 10: Base material, 14: Fiber, 18: Heating furnace for heat treatment.
Claims (1)
て、フアイバを紡糸し、かつプライマリコートを
施した直後に、フアイバを350〜500℃で、２〜10
秒間、加熱することを特徴とする、光通信用フア
イバの製造方法。1 In the production of optical fibers with cores containing P, immediately after spinning the fibers and applying the primary coat, the fibers are heated at 350 to 500°C for 2 to 10 minutes.
A method for manufacturing an optical communication fiber, the method comprising heating for a second.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59064807A JPS59195559A (en) | 1984-03-30 | 1984-03-30 | Manufacture of fiber for optical communication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59064807A JPS59195559A (en) | 1984-03-30 | 1984-03-30 | Manufacture of fiber for optical communication |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP52099710A Division JPS5930661B2 (en) | 1977-08-19 | 1977-08-19 | Method of manufacturing fiber for optical communication |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59195559A JPS59195559A (en) | 1984-11-06 |
| JPS6245184B2 true JPS6245184B2 (en) | 1987-09-25 |
Family
ID=13268880
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59064807A Granted JPS59195559A (en) | 1984-03-30 | 1984-03-30 | Manufacture of fiber for optical communication |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59195559A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0481793U (en) * | 1990-11-27 | 1992-07-16 |
-
1984
- 1984-03-30 JP JP59064807A patent/JPS59195559A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0481793U (en) * | 1990-11-27 | 1992-07-16 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59195559A (en) | 1984-11-06 |
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