The Few-Mode Fiber(FMF)-based Mode Division Multiplexing(MDM) system has currently become a research focus in the world as it can continue to improve the transmission capacity of fiber-optic communication systems.After completing the FMF design
this paper studies the excitation mechanism
characteristics and implementation of three kinds of mode selective excitation techniques
namely offset injection
Long Period fiber Grating(LPG) and Spatial Light Modulation(SLM)
with the focus on SPM-based mode selective excitation technique.