Abstract: Combination of programmed chirp and dispersion profiles produced a quasisoliton nonlinear pulse with a stable structure. With the nonlinear effects taken into account, the concept of quasisoliton is introduced and the comparison between the quasisoliton solution and the soliton solution is made. Compared with soliton, quasi optical soliton has more advantages, such as reduced interaction, smaller peak power and pulse width adjustable by modulating fiber parameters. Quasisoliton transmission has great potential in next generation of communication system.