Title :
Optical duobinary modulation with alleviated phase constraints
Author_Institution :
Alcatel Alsthom Recherche, Marcoussis, France
fDate :
8/1/1997 12:00:00 AM
Abstract :
Spectral compression is a necessary function for applications in optical communication such as noise reduction, use of bandwidth-limited devices, etc. Ideal duobinary modulation, which allows the reduction of the spectrum bandwidth, requires a π (rad) phase shift between the “-1” and the “+1” logical levels. We show that with a reasonable finite extinction ratio of 10 dB, a phase shift as low as 0.18 π can be used, with a resulting spectrum compression ratio of nearly 2
Keywords :
bandwidth compression; optical communication; optical information processing; optical modulation; optical noise; spectral analysis; bandwidth limited devices; finite extinction ratio; logical levels; noise reduction; optical communication; optical duobinary modulation; phase constraints; phase shift; spectral compression; spectrum bandwidth reduction; spectrum compression ratio; Bandwidth; Chromatic dispersion; Extinction ratio; Noise reduction; Optical devices; Optical fiber communication; Optical modulation; Optical noise; Optical receivers; Phase modulation;
Journal_Title :
Communications, IEEE Transactions on
