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AssigneeShin-Etsu Chemical Co., Ltd.
InventorsHaruyoshi Kuwabara, Tadakatsu Shimada, Hideo Hirasawa
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There is disclosed a method for producing a porous optical fiber base material comprising depositing fine glass powder on a rotating member, wherein pore size of the deposited fine glass powder is controlled, and preferably, mode of the pore size is controlled to be 0.1 to 1 μm, or wherein a total amount of absorbed H2O amount and OH group amount on the fine glass powder per square meter of fine glass powder surface area is controlled to be 3.5×10−5 to 7.5×10−5 g. Such porous optical fiber base materials have an improved weight of fine glass powder deposited on the member per batch, or an improved fine glass powder deposit efficiency, which may greatly contribute to improvement of production ability and reduction of production cost. Further, there is disclosed a method for producing a porous optical fiber base material comprising depositing fine glass powder on a rotating member, wherein, as for the deposited fine glass powder, pore volume of pores having a pore size of 10 μm or more is controlled to be 1% by volume or less relative to the total pore volume. Such a porous optical fiber base material can markedly decrease air bubbles in an optical fiber base material after the fusion vitrification.
A porous optical fiber base material comprising fine glass powder deposited on a circumferential surface of a target to be an optical fiber core, wherein the deposited glass has a controlled pore size distribution.
A porous optical fiber base material comprising fine glass powder deposited on a circumferential surface of a target to be an optical fiber core, wherein a total amount of absorbed H2O amount and OH group amount on the fine glass powder per square meter of fine glass powder surface area is 3.5×10−5 to 7.5×10−5 g.
A method for producing a porous optical fiber base material comprising depositing fine glass powder on a rotating target to be an optical fiber core, wherein pore size distribution of the deposited glass is controlled.
A method for producing a porous optical fiber base material comprising depositing fine glass powder on a rotating target to be an optical fiber core, wherein a total amount of absorbed H2O amount and OH group amount on the fine glass powder per square meter of fine glass powder surface area is controlled to be 3.5×10−5 to 7.5×10−5 g.
A porous optical fiber base material comprising a fine glass powder deposited on a circumferential surface of a target to be an optical fiber core, wherein pore volume ratio of pores having a pore size of 10 μm or more in the deposited glass is 1% by volume or less of the total pore volume.
A method for producing a porous optical fiber base material comprising depositing fine glass powder on a rotating target to be an optical fiber core, wherein pore volume ratio of pores having a pore size of 10 μm or more in the deposited glass is controlled to be 1% by volume or less of the total pore volume.
A method for producing a porous optical fiber base material comprising depositing fine glass powder on a rotating target to be an optical fiber core, wherein the revolution number of the target is controlled during the deposition of the fine glass powder so that peripheral speed of the target should be 17 m/minute or more.
Dependencies are inferred from the claim text.