Large effective area optical fiber with low bend loss

摘要

An optical fiber includes a central glass core region comprising maximum refractive index delta percent Delta1, a first inner annular region surrounding said core comprising refractive index delta percent Delta2, a depressed annular region surrounding said inner annular region and comprising Delta3 and a third annular region surrounding the depressed annular region comprising refractive index delta percent Delta4; wherein Delta1MAX>Delta4>Delta2>Delta3. The difference between Delta4 and Delta2 is greater than 0.01% and profile volume, |V3| is at least 10%-mum2. The fibers exhibit an effective area at 1550 nm which is greater than 110 mum2.