title: Narrowband optical filter, with a variable transmission spectrum, using stimulated Brillouin scattering in optical fiber.
abstract: A novel shape-adjustable narrowband optical filter utilizing stimulated Brillouin scattering in an optical fiber is proposed and demonstrated. In this scheme, binary-phase-shift-keying modulation is applied to the pump wave to broaden and shape the Brillouin gain spectrum. By choosing an appropriate modulation data pattern, we realized a flat-top steep-cutoff optical bandpass filter with a 3-dB bandwidth of 1.5 GHz and a 10-dB bandwidth of 2 GHz is realized. In addition, a tunable optical notch filter is also realized by deamplification of the anti-Stokes wave.
authors.forename: Takuo
authors.initials: T
authors.lastname: Tanemura
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Takushima
authors.forename: Kazuro
authors.initials: K
authors.lastname: Kikuchi