Generation of THz Repetition-Rate Femtosecond Pulse Trains at 1030 nm Using Dual-Frequency Beat Compression in Photonic Crystal Fiber

The generation of high-repetition-rate short pulse trains has been extensively studied since the 1980s. One common approach is to nonlinearly compress an initial beat signal through multiple four-wave mixing processes in the anomalous chromatic dispersion region of an optical fiber [1]. Recent studies have linked this compression process to Akhmediev Breathers, a periodic analytical solution to the nonlinear Schrödinger equation [2], which is of significant interest due to its connection with modulation instability, supercontinuum generation and rogue waves [3], [4]. So far, the experimental studies have been limited to pulses with a duration of few hundred of femtosecond at wavelengths over 1300 nm where standard optical fibers have anomalous chromatic dispersion.