LOW BEND LOSS OPTICAL FIBER

摘要

An optical fiber includes a central glass core region comprising maximum refractive index delta percent ?1, a first inner annular region surrounding said core comprising refractive index delta percent ?2, a depressed annular region surrounding said inner annular region and comprising ?3 and a third annular region surrounding the depressed annular region comprising refractive index delta percent ?4; wherein ?1MAX > ?4 > ?2 > ?3. The difference between ?4 and ?2 is greater than.01 and profile volume, |V3| is at least 60 %?µm2.