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1. (WO1991006512) PRODUCTION METHOD FOR OPTICAL FIBER BASE MATERIAL
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1991/006512 International Application No.: PCT/JP1990/001398
Publication Date: 16.05.1991 International Filing Date: 31.10.1990
IPC:
C03B 37/018 (2006.01)
C CHEMISTRY; METALLURGY
03
GLASS; MINERAL OR SLAG WOOL
B
MANUFACTURE OR SHAPING OF GLASS, OR OF MINERAL OR SLAG WOOL; SUPPLEMENTARY PROCESSES IN THE MANUFACTURE OR SHAPING OF GLASS, OR OF MINERAL OR SLAG WOOL
37
Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
01
Manufacture of glass fibres or filaments
012
Manufacture of preforms for drawing fibres or filaments
014
made entirely or partially by chemical means
018
by glass deposition on a glass substrate, e.g. by chemical vapour deposition
Applicants:
FUJITSU LIMITED [JP/JP]; 1015, Kamikodanaka Nakahara-ku Kawasaki-shi Kanagawa 211, JP (AllExceptUS)
OKAMURA, Kouji [JP/JP]; JP (UsOnly)
ARIMA, Tadao [JP/JP]; JP (UsOnly)
Inventors:
OKAMURA, Kouji; JP
ARIMA, Tadao; JP
Agent:
MATSUMOTO, Takashi; Matsumoto & Associates DIK Building 3rd Floor 6-10-8, Akasaka Minato-ku Tokyo 107, JP
Priority Data:
1/28184331.10.1989JP
1/28873208.11.1989JP
1/28873308.11.1989JP
1/28873408.11.1989JP
Title (EN) PRODUCTION METHOD FOR OPTICAL FIBER BASE MATERIAL
(FR) PROCEDE DE PRODUCTION D'UN MATERIAU DE BASE POUR FIBRES OPTIQUES
Abstract:
(EN) In accordance with a first method of the present invention, doping is conducted by forming two constricted portions (28) in a quartz reaction tube (4) and charging a solution containing a rare earth element compound as a solute between the constricted portions (28). Accordingly, a dope concentration becomes uniform in a longitudinal direction of an optical fiber base material (30) and moreover, defects are difficult to occur. Furthermore, complicated works are not necessary. In accordance with a second method of the present invention, a soot-like core glass (26) is impregnated with mist-like solution and high-precision control of a dope concentration becomes possible. In accordance with a third embodiment ot the present invention, the concentration is controlled in accordance with quantity of a laser beam passing through the soot-like core glass (26) and impregnation of the solution is carried out. In this manner a dope concentration not depending on the density of the soot-like core glass can be obtained. In accordance with a fourth method of the present invention, shaping of the soot-like core glass (26) is repeated several times at different temperatures, so that a dope concentration distribution in a core diameter direction can be set arbitrarily.
(FR) Selon un premier procédé, on effectue le dopage en formant deux étranglements (28) dans un tube de réaction en quartz (4) et en chargeant une solution contenant un composé à base d'un élément de terre rare sous forme de soluté entre les étranglements (28). Grâce à cet agencement, la concentration de l'agent de dopage dans le sens de la longueur du matériau de base (30) pour fibres optiques est uniforme, des défauts se produisent difficilement, et des opérations compliquées sont superflues. Selon un deuxième procédé, une âme en verre fuligineux (26) est imprégnée d'une solution pulvérisée, ce qui permet de réguler de manière très précise la concentration d'un agent dopant. Selon un troisème procédé, la concentration est régulée en fonction de la quantité d'un rayon laser traversant l'âme en verre fuligineux (26), et on procède ensuite à l'imprégnation de la solution. On peut ainsi obtenir une concentration d'agent de dopage indépendante de la densité de l'âme en verre fuligineux. Selon un quatrième procédé, on répète plusieurs fois le façonnage de l'âme en verre fuligineux (26) à différentes températures, afin de fixer de manière arbitraire la distribution de la concentration de l'agent de dopage dans le sens du diamètre de l'âme.
Designated States: AU, CA, JP, US
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, NL, SE)
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)
Also published as:
EP0451293US5711782CA2042593AU1990066311