Compound solitons in fiber Bragg grating

Single soliton and compound solitons are described by coupled-mode equation.It is noted that three parameters,which are dimensionless group velocity,normalized frequency,and grating strength,influence formed solitons by emulation.The novel designs of parallel and serial multi-grating are advanced,and the compound soli-tons formed from parallel multi-grating are linear superposition;the compound solitons formed from serial multi-grating are nonlinear superposition,and finally two general formulae are obtained.Furthermore,it is theoretically shown that the compound grating solitons are prominent and flexible signals in optical commu-nication.