Spectral filtering of chirped signals with an edge of a fiber grating filter improves propagation in nondispersion-shifted fiber. The improvement is due to a temporal shift of the frequency modulation with respect to the amplitude modulation. By filtering the chirped output of a semiconductor optical amplifier (SOA) wavelength converter with a fiber grating edge we obtain error-free transmission of converted data through 100 km of nondispersion-shifted fiber at 5 Gb/s.
Hsiao-Yun Yu, Daniel Mahgerefteh, Pak S. Cho, and Julius Goldhar, "Improved Transmission of Chirped Signals from Semiconductor Optical Devices by Pulse Reshaping Using a Fiber Bragg Grating Filter," J. Lightwave Technol. 17, 898- (1999)