CONTROL FILTERS FOR REPEATERLESS SOLITON TRANSMISSION

The Gordon-Haus limit restricts the distance of repeaterless propagati on of solitons. Recently, it was found that judicious placement of fil ters can extend the limit. This discovery makes soliton communications competitive with other means of long distance signal transmission. Th is article reviews some properties of solitons, the developments since the first proposal of Hasegawa to use solitons for long distance tran smission, and the recent work on control filters.