PPM SOLITON PULSE TRAINS IN OPTICAL FIBERS

Numerical calculations concerning pulse position-modulated (PPM) infin ite (periodic) and finite trains of bright pulses in a single mode opt ical fibre are presented. Use is made of an inherent feature of the be am propagation method which yields truly periodic solutions. The solit ons are organised into unit cells containing various numbers of solito ns, and phase differences are permitted between them. A comparison bet ween the behaviour of a group of solitons in a unit cell of a periodic train and the same number of solitons, standing alone as a group, is made. Generic plots for the maximum temporal displacement against the position-modulation coding parameter are presented for both 8 and 16 b it patterns.