SINGLE MODE OPTICAL FIBER

摘要

PURPOSE:To decrease the stress load on a core at the time of drawing and to lessen the increase in transmission loss by bending by lowering the softening point of a clad to the softening point lower than the softening point of the core and jacket and specifying the thickness of the jacket. CONSTITUTION:The clad 2 is formed to the softening point lower than the softening point of the core 1 and the jacket 3 and the thickness of the jacket 3 is specified to 2.5-10mum. Since the thickness of the jacket 3 is specified to 2.5-10mum, the increase in the transmission loss by bending is suppressed and since the jacket 3 is provided, the stress acting upon the core 1 at the time of drawing is decreased and the transmission loss is lessened even if the jacket is thin. The single mode optical fiber which has a low transmission loss value and lessens the increase in the transmission loss by bending is thereby obtd. at a high yield.