title: Sharp tunable optical filters based on the polarization attributes of stimulated Brillouin scattering.
abstract: Sharp and highly-selective tunable optical band-pass filters, based on stimulated Brillouin scattering (SBS) amplification in standard fibers, are described and demonstrated. Polarization pulling of the SBS-amplified signal wave is used to increase the selectivity of the filters to 30 dB. Pump broadening via synthesized direct modulation was used to provide a tunable, sharp and uniform amplification window: Pass-band widths of 700 MHz at half maximum and 1 GHz at the -20 dB points were obtained. The central frequency, bandwidth and shape of the filter can be arbitrarily set. Compared with scalar SBS-based filters, the polarization-enhanced design provides a higher selectivity and an elevated depletion threshold.
authors: Faculty of Engineering, Tel-Aviv University, Tel-Aviv 69978, Israel. assafwise@yahoo.com
authors: Assaf
authors: A
authors: Wise
authors: Moshe
authors: M
authors: Tur
authors: Avi
authors: A
authors: Zadok