Adaptive dispersion slope equalizer with a novel dispersion detection technique

摘要

We realized the first adaptive dispersion slope equalizer (ADSE) that equalizes dispersion over a wide wavelength range (6 nm) in the zero dispersion wavelength region of a dispersion-shifted fiber (DSF). The ADSE is based on a pair of nonlinearly chirped fiber Bragg gratings (NCFBGs), which are designed to equalize exactly the dispersion profile of a DSF. The dispersion changes were tracked using a technique that employs opposite dispersion fibers to identify the sign of the dispersion change. We demonstrate the adaptive equalization of the dispersion changes in an 83 km DSF, induced by temperature changes between -10 and 60℃. This ADSE will play an important role in future 160 Gbit/s/ch transmission systems.