title: Picosecond and sub-picosecond flat-top pulse generation using uniform long-period fiber gratings.
abstract: We propose a novel linear filtering scheme based on ultrafast all-optical differentiation for re-shaping of ultrashort pulses generated from a mode-locked laser into flat-top pulses. The technique is demonstrated using simple all-fiber optical filters, more specifically uniform long period fiber gratings (LPGs) operated in transmission. The large bandwidth typical for these fiber filters allows scaling the technique to the sub-picosecond regime. In the experiments reported here, 600-fs and 1.8-ps Gaussian-like optical pulses (@ 1535 nm) have been re-shaped into 1-ps and 3.2-ps flat-top pulses, respectively, using a single 9-cm long uniform LPG.
authors.forename: Y
authors.initials: Y
authors.lastname: Park
authors.forename: M
authors.initials: M
authors.lastname: Kulishov
authors.forename: R
authors.initials: R
authors.lastname: Slavík
authors.forename: J
authors.initials: J
authors.lastname: Azaña