Adjustable dispersion equaliser for 10 and 20 Gbit/s over distances up to 160 km

Abstract
A novel chirped fibre grating has been used to equalise the dispersion of 10 and 20 Gbit/s data over 80 and 160 km standard fibre at 1557 nm. Unlike earlier fixed value dispersion equalisers, the grating chirp is adjustable, enabling the same device to be used for different fibre lengths and bit rates.