title: Double Brillouin frequency shift through circulation of odd-order Stokes signal.
abstract: We demonstrate a simple configuration for generating a double Brillouin frequency shift through the circulation of an odd-order Brillouin Stokes signal. It is operated based on cascaded Brillouin scattering in single-mode optical fibers that behave as the Brillouin gain media. A four-port circulator is incorporated into the setup to circulate the odd-order Brillouin Stokes signal in the fiber. It thus initiates a higher order Brillouin Stokes signal, which is double Brillouin frequency downshifted from the input signal. For the 5 km long fiber, the Brillouin pump power at 23 mW gives a clean output spectrum with 30 dB sideband suppression ratio. The output signal is 0.174 nm or approximately 21.7 GHz downshifted from the input signal.
authors.affiliation: Wireless and Photonics Network Research Center, Faculty of Engineering, University Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.
authors.forename: Yu Gang
authors.initials: YG
authors.lastname: Shee
authors.forename: Mohammed Hayder
authors.initials: MH
authors.lastname: Al-Mansoori
authors.forename: Alyani
authors.initials: A
authors.lastname: Ismail
authors.forename: Salasiah
authors.initials: S
authors.lastname: Hitam
authors.forename: Mohd Adzir
authors.initials: MA
authors.lastname: Mahdi