PRODUCTION OF DISPERSION-SHIFTED OPTICAL FIBER PREFORM

Japanese Patent JP3137849

B2

PURPOSE: To obtain a preform with the refractive index distribution of a stepped core part flattened and without the soot being cracked by forming the soot for the stepped core part with use of plural burners and specifying the maximum surface temp. of the soot.
CONSTITUTION: Gaseous H2, gaseous O2, glass raw gas and GeCl4 are supplied to a first burner 11, and a soot 21 for a high-refractive index center core part contg. GeO2 as a dopant to increase the refractive index is formed on a starting rod-shaped base material 12. A raw gas having a lower content of GeCl4 than that for the first burner 11 is then supplied to a second burner 13, a raw gas having a slightly lower content of GeCl4 than that for the second burner 13 is supplied to a third burner 14 to form a stepped core part consisting of the soots 22 and 23 having a lower refractive index than the soot 21 around the soot 21, and the maximum surface temp. of the soots 22 and 23 is controlled to 600-700°C. A soot 24 for a clad part having a lower refractive index than for the stepped core part is formed around the stepped core part and then vitrified.

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Manabu Kudo
Koichi Takahashi

JP29998594A

February 26, 2001

December 02, 1994

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Fujikura Ltd.

G02B6/00; C03B37/014; C03B37/018; G02B6/02; G02B6/036; (IPC1-7): C03B37/018; G02B6/00; G02B6/16

JP6316428A
JP6316429A
JP593033A
JP6227343A
JP1242432A
JP627641A
JP63307138A

Masatake Shiga

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