Abstract

We present a new technique for measuring puise temporal profiles at the femtosecond time scale using a direct real-time method based on the nonlinear-optic Fourier transformation process (NOFT). NOFT has been previously implemented in the spectral compressor (SC) and consist in a dispersive delay line (DDL) followed by a nonlinear single-mode lightguide [1]. In DDL pulses are stretched experiencing a negative chirp, and in the nonlinear fiber the chirp quenching due to self- or cross-phase modulation (SPM/XPM) leads to spectral narrowing.

© 1998 Optical Society of America