[Opt. Soc. America OFC '98 Optical Fiber Communication Conference and Exhibit. Technical Digest Conference Edition 1998 OSA Technical Digest Series. Vol.2 - San Jose, CA, USA (22-27 Feb. 1998)] OFC '98. Optical Fiber Communication Conference and Exhibit. Technical Digest. Conference Edition. 1998 OSA Technical Digest Series Vol.2 (IEEE Cat. No.98CH36177) - Simplified optical duobinary coding with a new return-to-one modulation format capable of transmitting 10 Gbit/s over 200 km standard dispersive fiber