Title :
Brillouin Rectangular Optical Filter With Improved Selectivity and Noise Performance
Author :
Wei Wei ; Lilin Yi ; Jaouen, Yves ; Morvan, Michel ; Weisheng Hu
Author_Institution :
State Key Lab. of Adv. Opt. Commun. Syst. & Networks, Shanghai Jiao Tong Univ., Shanghai, China
Abstract :
We demonstrate a high selectivity rectangular optical filter based on stimulated Brillouin scattering (SBS) effect in fiber with bandwidth from 1 to 3 GHz. By using pump-splitting dual-stage configuration, the filter selectivity has been improved by more than 16 dB and exceeded 40 dB within 2-GHz bandwidth. The filter shape is well controlled by using precise digital feedback compensation and nonlinearity management. We also analyze the noise performance of both the single-stage and dual-stage filters by evaluating the signal-to-noise ratio of the amplified signal using coherent detection. The results show that the dual-stage approach performs better than the single-stage architecture in achieving higher selectivity and improving noise performance. The inherent tuning flexibility with improved performance makes the proposed SBS filter one of the best candidates for microwave photonic applications.
Keywords :
microwave photonics; optical control; optical filters; optical noise; optical pumping; optical tuning; stimulated Brillouin scattering; Brillouin rectangular optical filter; SBS; bandwidth 2 GHz; coherent detection; dual-stage filters; filter selectivity; filter shape; microwave photonic applications; noise performance; nonlinearity management; precise digital feedback compensation; pump-splitting dual-stage configuration; signal-to-noise ratio; single-stage filters; stimulated Brillouin scattering; tuning flexibility; Bandwidth; Gain; Microwave filters; Noise; Optical fiber filters; Scattering; Rectangular optical filter; high selectivity; microwave photonic filter; stimulated Brillouin scattering;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2015.2432115
