title: Controllable photoinduced optical attenuation in a single-mode optical fiber by irradiation of a femtosecond pulse laser.
abstract: Novel optical attenuation fibers were fabricated by the irradiation of a focused infrared femtosecond pulsed laser onto the core of a silica glass single-mode optical fiber. Optical attenuation at a wavelength of 1.55 microm proportionally increased with increasing numbers of irradiation points and was controllable under laser irradiation conditions. The single-mode property of the waveguide and the mode-field diameter of the optical fiber were maintained after irradiation of the femtosecond laser. It is suggested that the attenuation results from optical scattering at photoinduced spots formed inside the fiber core.
authors.affiliation: Photon Craft Project, Japan Science and Technology Agency, Keihanna-Plaza Super-Lab. 2-5, 1-7 Hikaridai, Seika-cho, Kyoto 619-0237, Japan.
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Himei
authors.forename: Jianrong
authors.initials: J
authors.lastname: Qiu
authors.forename: Sotohiro
authors.initials: S
authors.lastname: Nakajima
authors.forename: Akihiko
authors.initials: A
authors.lastname: Sakamoto
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Hirao