| 摘要 |
The present invention relates to a method for preparing a GI (graded index) plastic optical fiber preform having a radial refractive index gradient, the refractive index increasing gradually from the outer periphery of the preform toward the center thereof, comprising inserting a 1st plastic tube (inside diameter: d<SUB>1</SUB><SUP>i</SUP>, outside diameter: d<SUB>1</SUB><SUP>o</SUP>) ( 111 ) made of a first polymer (refractive index: n<SUB>1</SUB>) in a cylinder reactor (inside diameter: d<SUB>0</SUB><SUP>i</SUP>, d<SUB>1</SUB><SUP>o</SUP><=D<SUB>0</SUB><SUP>i</SUP>) and inserting a 2nd plastic tube (inside diameter: d<SUB>2</SUB><SUP>i</SUP>, outside diameter d<SUB>2</SUB><SUP>o</SUP>, d<SUB>2</SUB><SUP>o</SUP><=D<SUB>1</SUB><SUP>i</SUP>) ( 112 ) made of a second polymer (refractive index: n<SUB>2</SUB>, n<SUB>2</SUB>>=n<SUB>1</SUB>) in the 1st plastic tube, the reactor, the 1st and 2nd plastic tubes are positioned coaxially, injecting a precursor of a third polymer (refractive index: n', n'>=n<SUB>2</SUB>) into the 2nd plastic tube, injecting a precursor of a fourth polymer (refractive index: n'', n<SUB>1</SUB><=N''<=N<SUB>2</SUB>) into the space between the 1st and 2nd plastic tubes.
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