title: Gamma-ray radiation response at 1550 nm of fluorine-doped radiation hard single-mode optical fiber.
abstract: We have investigated gamma-ray radiation response at 1550 nm of fluorine-doped radiation hard single-mode optical fiber. Radiation-induced attenuation (RIA) of the optical fiber was measured under intermittent gamma-ray irradiations with dose rate of ~10 kGy/h. No radiation hardening effect on the RIA by the gamma-ray pre-dose was found when the exposed fiber was bleached for long periods of time (27~47 days) at room-temperature. Photo-bleaching scheme upon 980 nm LD pumping has proven to be an effective deterrent to the RIA, particularly by suppressing the incipient RIA due to room-temperature unstable self-trapped hole defects (STHs). Large temperature dependence of the RIA of the optical fiber together with the photo-bleaching effect are worthy of note for reinforcing its radiation hard characteristics.
authors.forename: Youngwoong
authors.initials: Y
authors.lastname: Kim
authors.forename: Seongmin
authors.initials: S
authors.lastname: Ju
authors.forename: Seongmook
authors.initials: S
authors.lastname: Jeong
authors.forename: Seung Ho
authors.initials: SH
authors.lastname: Lee
authors.forename: Won-Taek
authors.initials: WT
authors.lastname: Han