In order to improve the bandwidth efficiency of optical communication system

a new multiplexing technology called Mapping Multiplexing（MM）technology is proposed.In the MM technology

multi-channel signal multiplexing is achieved by using dual-slot multi-amplitude signal mapped to multiplexing signal.This paper analyzes the principle of multiplexing and demultiplexing of MM technology

and uses 4-channel multiplexing as an case study to design MM multiplexer and demultiplexer by Matlab.By means of the combination of Optisystem and Matlab

the optical fiber transmission system is designed based on MM technology.The obtained eye diagram is very clear

which verifies the feasibility of the method.Compared with the same rate of NRZ signal and RZ signal

the bandwidth of MM signal is reduced by half and two-thirds.The proposed MM technology can not only effectively improve the system’s bandwidth efficiency

but also increase the dispersion tolerance.It has a wide range of applications in optical fiber communication system.