Abstract
With the rapid progress in erbium-doped fiber amplifiers (EDFAs), much attention has been paid toward overcoming fiber dispersion in optically amplified systems that can now transmit many Gbit/s signals over 1000's of km. Considerable progress has been made in various approaches to reducing fiber dispersion.1 These methods fall into three general categories: (1) The use of purely optical methods for reversing or controlling the effects of group velocity dispersion. (2) Coherent transmission and heterodyne detection followed by delay equalization in the electrical domain. (3) The use of transmission formats whereby the baseband signal spectrum is compressed for transmission, giving rise to a transmitted signal bandwidth that is less than that of conventional double-side band transmission. Two methods that have been successfully demonstrated to date are duo-binary signaling2-4 and coherent optical vestigial or single-side band transmission followed by homodyne detection and electrical delay equalization.5
© 1996 Optical Society of America
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