Bistable soliton states and switching in doubly inhomogeneously doped ???ber couplers

摘要

Switching between the bistable soliton states in a doubly and inhomogeneously doped ???ber system is studied numerically. Both the cases of lossless as well as lossy couplers are considered. It is shown that both up-switching (from the low state to the high state) and down-switching (from the high state to the low state) of solitons between bistable states are realizable, if the ampli???cation of the input soliton for up-switching and the extraction of energy from it for down-switching are suitably adjusted.