KR850001680B1 - Preparation for optical fiber preform - Google Patents

Preparation for optical fiber preform Download PDF

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Publication number
KR850001680B1
KR850001680B1 KR7904633A KR790004633A KR850001680B1 KR 850001680 B1 KR850001680 B1 KR 850001680B1 KR 7904633 A KR7904633 A KR 7904633A KR 790004633 A KR790004633 A KR 790004633A KR 850001680 B1 KR850001680 B1 KR 850001680B1
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South Korea
Prior art keywords
optical fiber
core
base material
tube
rod
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KR7904633A
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Korean (ko)
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KR830001151A (en
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다께오 에다히로
유우이찌 미스다
고오따로오 다나까
Original Assignee
아끼구사 도꾸지
닛본 덴신덴와 고오샤
다부찌 노보루
스미도모덴기 고오교오 가부시기가이샤
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Priority to KR7904633A priority Critical patent/KR850001680B1/en
Publication of KR830001151A publication Critical patent/KR830001151A/en
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    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Glass Compositions (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)

Abstract

The preform is made into a tubular body with glass film of high purity. The film consists of a core and a clad in quartz tube. The tube of low viscosity is heated in part during rotation at 1600-1800≰C. The burner is moved twice from one side to the other at 2cm/min. The inner diam. is narrow. Then CL2 or chlorider gas is poured into the cavity. The optical fiber made from this preform has low optical absorption.

Description

광파이버용 모재의 제조방법Manufacturing method of base material for optical fiber

제1도는 코어클래드 구성체의 설명도로서, 제1(a)도는 사시도,제1(b)도는 단면설명도.1 is an explanatory view of a core cladding structure, the first (a) is a perspective view, the first (b) is a cross-sectional explanatory view.

제2도는 봉상 광파이버용 모재의 팡파이버의 단면도와 그 굴절율의 분포도.2 is a cross-sectional view of a fan fiber of a base material for rod-shaped optical fibers and a distribution diagram of their refractive indices.

제3도는 본 발명의 제조방법의 설명도이다.3 is an explanatory diagram of a manufacturing method of the present invention.

본 발명은 수분함유도가 극지 적은 광(光) 파이버용 모재(母材)의 제조방법에 관한 것이다.The present invention relates to a method for producing a base material for an optical fiber having extremely low moisture content.

광파이버용 모재의 제조방법으로서는 석영관의 내면에 순도가 높은 유리막을 형성시키거나, 혹은 카아 본 봉(棒)의 외면에 순도가 높은 유리막을 형성시켜 카아본 봉을 뽑아내는 것에 의하여, 제1도에 표시한 것과 같은 원관상(円管狀)의 코어-클래드(Core-clad) 구성체를 만들고, 이것을 가열처리(콜랩스(coll-apse)라고 한다)하는 것으로 제2도에 표시한 것과 같은 봉상의 코어-클래드 구성체(1)를 형성시키는 방법 이 있다.As a manufacturing method of the base material for an optical fiber, a high purity glass film is formed on the inner surface of a quartz tube, or a high purity glass film is formed on the outer surface of a carbon rod, and the carbon rod is pulled out, and FIG. A rod-like core-clad construct as shown in Fig. 2 is made, and this is heat-treated (called a coll-apse) to form a rod-like rod as shown in FIG. There is a method of forming the core-clad construct 1.

그런데, 모재의 품질면에서 코어안에 있어서의 수분함유는 광의 감쇠량을 증대시키기 때문에, 광의 전송(傳送) 특성상 바람직하지 못하다. 이때문에, 원료순도를 높이거나, 원료 배관계통을 주의 깊게 유지하는 것으로 수분량의 감소를 도모하고 있으나, 10ppm 이하로 하는 것이 극히 어려웠었다.However, in terms of the quality of the base material, the water content in the core increases the amount of attenuation of the light, which is not preferable in terms of the transmission characteristics of the light. For this reason, the water content is reduced by increasing the purity of the raw material or maintaining the raw material piping system carefully, but it was extremely difficult to set it to 10 ppm or less.

상기의 광파이버 모재의 제조방법에 있어서, 극소량의 수분 함유량까지도 효과적이고 또한 정제적으로 제거하는 방법을 제공하는 것이 본 발명의 목적이다.In the manufacturing method of the optical fiber base material, it is an object of the present invention to provide a method for effectively and refiningly removing even a very small amount of water.

이러한 목적은, 원관상의 코어-클래드 구성체를 고온으로 가열할때에, 원관의 내벽을 염소 또는 염화물 함유분위기에 쬐이면 달성할 수 있다는 것을 알게 되었다. 여기서, 원관상의 코어-클래드 구성체란 후술되는 바의 다공질의 유리체는 아니고, 용융상태의 코어클래드용 유리막을 지니는 원관상 유리체를의미한다.It has been found that this object can be achieved by heating the inner core of the tubular core-clad construct to a high temperature by subjecting the inner wall of the tubular to a chlorine or chloride containing atmosphere. Here, the cylindrical core-clad structure is not a porous glass body as described later, but means a cylindrical glass body having a glass film for core clad in a molten state.

종래, 높은 실리카 유리의 잔류수분 제거박법으로서는, 일본국 특공소 42-23036호 공보 또는 특개소 50-149356호 공보에 표시된 것과 같이, 다공질의 유리를 만들고, 여기에 염소분위기 밑에서 고은처리를 행하여 효과적으로 수분을 제거하는 방법이 공지되어 있다. 이 종래의 방법에 비하여 다공질체가 아니라도, 고온 저점도(低粘度) 유리체에서도 효과적으로 수분이 제거된다는 것을 알았다.Conventionally, as a method for removing residual moisture of high silica glass, as shown in JP-A-42-23036 or JP-A-50-149356, a porous glass is made, which is subjected to a high silver treatment under a chlorine atmosphere to effectively Methods of removing water are known. Compared with this conventional method, it was found that even in the case of not being a porous body, water is effectively removed even in a high temperature low viscosity glass body.

본 발명에 의하여, 원관의 내벽근방, 즉 광이 통과하는 코어부의 수분함유량을 가장 적게할 수 있으므로, 수분에 의한 광흡수의 영향이 거의 없는 특성이 뛰어난 광파이버의 제조가 효과적으로 달성된다.According to the present invention, since the water content in the vicinity of the inner wall of the tube, i.e., the core portion through which light passes, can be minimized, the production of an optical fiber having excellent characteristics with little effect of light absorption by moisture can be effectively achieved.

본 반면을 구체적으로 설명하면 다음과 같다.The present description will be described in detail as follows.

제1도는 석영관의 내면에 높은 순도의 유리막을 형성시킨 원관상에 코어클래드 구성체(1)(이하 원관이라한다)를 도시한 것이다. 제1(a)도는 사시도, 제1(b)도는 단면도이고 C는 코어층, K는 클래드층, T는 중공부이다. 상기 원관(1)을 제3도와 같이 회전시키고 외부에서 버어너(2)로 1600-1800℃ 정도로 국부가열하고, 버어너(2)를 2cm/분으로 이동시키면서 원관내에 Cl2가 10%함유된 산소 300cc/분을 흘러 넣었다. 버어너를 2회 왕복이동시켜 원관의 내경을 소경화(小徑化)시키고, 최종버어너의 이동시 Cl2가 함유된 가스의 첨가를 멈추어, 속이 가득차도록 한다. 얻어진 봉상 광파이머 모재(제2도)를 선인하여서 OH량을 측정한바 1-3ppm의 것이 얻어졌다.FIG. 1 shows a core clad structure 1 (hereinafter referred to as a circle tube) on a circle tube in which a high purity glass film is formed on the inner surface of a quartz tube. FIG. 1 (a) is a perspective view, FIG. 1 (b) is sectional drawing, C is a core layer, K is a cladding layer, T is a hollow part. Rotate the tube 1 as shown in FIG. 3 and locally heat the burner 2 to about 1600-1800 ° C. from the outside, and contain 10% of Cl 2 in the tube while moving the burner 2 at 2 cm / min. 300 cc / min of oxygen was introduced. The burner is reciprocated twice to make the inner diameter of the tube small, and to stop the addition of the gas containing Cl 2 during the final burner movement, thereby filling the inside. 1-3 ppm was obtained when the amount of OH was measured by selecting the obtained rod-shaped optical polymer base material (FIG. 2).

한편, 상기와 동일한 원관상 코어클래드 구성체에 Cl2함유산소를 흘러 넣지않고 속을 가득차게한 모재에 있어서, 이 모재의 함유량은 10-20ppm이었다. 무수산소 혹은 질소의 경우에는 5-10ppm정도의 OH량이었다. Cl2가스대신에 SiCl4, POCl3, GeC14, BCl3, CCl4, S2Cl2, NOCl, SOCl2, SO2C12를 사용하는 경우에도, Cl2가 함유된 가스를 사용하였을 때와 동일한 효과를 준다.On the other hand, in the chilled base material in the same circle tubular core cladding structure body and the full flow without putting in a Cl 2 containing oxygen, and the content of the base material is 10-20ppm. In the case of anhydrous oxygen or nitrogen, the amount of OH was about 5-10 ppm. SiCl 4, POCl 3, GeC1 4 , BCl 3, CCl 4, S 2 Cl 2, NOCl, SOCl 2, even when using the SO 2 C1 2, when using a gas containing Cl 2 instead of the Cl 2 gas Gives the same effect as

Claims (1)

석영관의 내면상에 코어(C) 및 클래드(K)로 구성되는 높은 순도의 용융유리막을 지니는 원관상 구성체(1)을 형성하고 가열에 의하여 중공부(T)가 없는 봉상 유리구성체를 협성하는 광파이버용 모재론 제조하는 방법에 있어서, 용융된 저점도의 원관을 가열하여 원관의 내경을 소경화하면서 원관상 중공부(T)에 염소 또는 염화물 가스를 도입하여 상기 원관을 봉상유리 구성체로하는 단계가 포함되는 것을 특징으로 하는 광파이버용 모재의 제조방법.On the inner surface of the quartz tube, a cylindrical tubular structure 1 having a high purity molten glass film composed of a core C and a cladding K is formed, and the rod-shaped glass structure having no hollow portion T is formed by heating. In the method of manufacturing the base material for the optical fiber, the step of heating the molten low-viscosity raw tube to reduce the inner diameter of the raw tube to introduce chlorine or chloride gas into the cylindrical hollow portion (T) to form the rod-like glass structure Method for producing a base material for an optical fiber, characterized in that it is included.
KR7904633A 1979-12-27 1979-12-27 Preparation for optical fiber preform KR850001680B1 (en)

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KR850001680B1 true KR850001680B1 (en) 1985-11-22

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