in optical signal transmission , an input optical signal is received that has double side band spectral characteristics . the input optical signal is optically filtered to produce an output optical signal having single side band spectral characteristics . the output optical signal is caused to include a soliton pulse . in optical signal transmission , a modulated rz optical signal is formed from an input optical signal . the modulated rz optical signal has single side band spectral characteristics . a data modulated optical signal is formed from the modulated rz optical signal . the data modulated optical signal includes a soliton optical signal that has ssb spectral characteristics and that includes a soliton pulse . the peak power and the mid - amplitude width of the soliton pulse are linked by a relationship that depends on the characteristics of an optical medium in which the soliton pulse travels .