Phase-shifted Bragg Grating Waveguide filters were formed in bulk glass for the first time by femtosecond laser direct writing. A narrow, tunable 0.1-nm transmission window at 1550-nm is demonstrated for tunable π and other phase-shifts.
Jason R. GrenierLuís A. FernandesJ. Stewart AitchisonP. V. S. MarquesPeter R. Herman
Haibin ZhangShane M. EatonPeter R. Herman
Lin MaShunxiang ShiGuanghua ChengLei YuQing LiuGuofu ChenWei Zhao