ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 33, Number 4
JKCSEZ 33(4)
August 20, 1989 

The refractive index, refractive-index distribution, birefringence, and the attenuation of the plastic fiber prepared from the transparent PMMA prerod were measured in accordance with continuous heat drawing temperature(Td). The refractive indices were decreased with Td elevation but the refractive-index distribution from the center of fiber to periphery was higher at lower Td. The steep decrease of gradient index was only at the periphery of higher Td. Birefringence was observed only below 220℃ and ranged 5 × 10-4 to 6 × 10-4. No birefringence was observed above 220℃. An elevation of Td brought about a monotonous decrease in the attenuation of the fiber.