We propose a method for phase, time-delay, and impulse-response recons
truction from spectral power reflectance or reflectivity and apply it
to uniform fiber Bragg gratings. This method is based on causality con
ditions and uses Hilbert and Wiener-Lee transforms. Results show a goo
d agreement between exact and reconstructed functions. (C) 1997 Optica
l Society of America