Abstract
Graded-index plastic optical fiber (GI POF) whose core material consisted of
copolymer of 2,2,2-trichloroethyl methacrylate and N-cyclohexyl maleimide, and
diphenyl sulfide (DPS) as dopant was fabricated by the dopant diffusion coextrusion
process, where poly(methyl methacrylate) and polycarbonate were employed as cladding and
overcladding material, respectively. The glass transition temperature T<sub>g</sub> of the
core material was set to 115 °C by modifying copolymer composition ratio and
DPS content. The attenuation of the copolymer-based GI POF was 132 and 330 dB/km at the
wavelengths of 660 and 780 nm, respectively. The bandwidths were 1.7 GHz and over 2 GHz
for 774 and 654 nm wavelength, respectively. Due to the high numerical aperture of 0.3,
the bending loss of the sample fiber consisting of 250 μm core diameter was ca. 0.03
dB under conditions of 180°, 10 mm radius, one time bending. As a result of heat
resistance performance evaluation, the attenuation was preserved for more than 2000 h at
100 °C. In mechanical property evaluation, the elongation at yield point was
ca. 6.7% and tensile load at yield point was 26.2 N (61.0 N/mm<sup>2</sup>), and sufficient
flexibility was confirmed by the kink stress test. From these results, the GI POF can be
used as high-speed data transmissible lines in automobiles and aircraft, and
interconnections inside electric appliances.
© 2012 IEEE
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