Abstract
For high bit-rate long haul point to point transmission systems (20 Gbit/s and higher), 3R regeneration (Re-amplification, Re-timing and Reshaping) might be soon required as a means to overcome physical limitations and hence to improve system margins and/or transmission distances. In that respect, the Optical Regeneration technique of Synchronous Modulation (SM) appears as a key technology for suitably controlling the signal characteristics but also to enhance or restore the signal-to-noise ratio.1
© 2002 Optical Society of America
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