PLASTIC OPTICAL FIBER, OPTICAL FIBER CABLE, OPTICAL FIBER CABLE WITH PLUG, AND MANUFACTURE OF OPTICAL FIBER

摘要

PROBLEM TO BE SOLVED: To provide a plastic optical fiber having high heat resistance and high mechanical intensity. SOLUTION: After a process for heating and drawing an undrawn plastic optical fiber 7 obtained by melt spinning, a process for executing limitation easing processing is executed in a heating atmosphere by setting up the peripheral velocity ratio (circumferential speed of rear rollers 4/circumferential speed of front rollers 3) between the front and rear rollers 3, 4 for the heated and drawn plastic optical fiber to 0.5 to <0.95 is executed. Heat treatment is executed in a specific temperature range.