A dispersion tunable grating in a 10-Gb/s 100-220-km-step index fiber link

A dispersion tunable 40 mm fiber grating has been employed in a 10 Gb/s, step-index fiber link. Dispersion is effectively compensated for span lengths in the range 103-217 km. However, at the longer spans the increased dispersion of the grating results in a reduced bandwidth and therefore its center wavelength is found to be critical (/spl plusmn/0.005 nm).