OPTICAL FIBER, FUSION BONDING METHOD FOR IT AND CONNECTOR FOR OPTICAL FIBER

摘要

An optical fiber large in non-linearity, and small in connection loss when fusion bonded with a quartz-based glass fiber. An optical fiber comprising, formed integrally, a hollow glass fiber provided with a hollow portion, a light transmitting unit having a center axis portion on the center axis of the hollow portion and a peripheral portion concentric with it, and a platy support radially extending from a plurality of portion on the outer peripheral surface of the light transmitting unit to reach the inner peripheral surface of the hollow glass fiber, characterized in that the refractive index (n<SUB>1</SUB>) of the center axis portion at a wavelength of 1550nm of the light transmitting unit is larger than the refractive index (n<SUB>2</SUB>) at a wavelength of 1550nm of its peripheral portion.