Optical transmission method, optical transmitter and optical receiver

摘要

An optical transmission system using a partial response encoded signal is disclosed, which improves the wavelength tolerance, compensates the dispersion in a simple way, reduces the limitation of the fiber input power. The transmitting operation includes receiving a clock signal from a system clock source (2); modulating a single mode optical signal based on the clock signal and generating an optical pulse signal having two longitudinal modes, the frequency interval between the two modes being n x B, where n is a natural number and B is a transmission speed; generating a partial response encoded signal by converting a binary NRZ encoded signal output from a digital signal source (5) in synchronism with the system clock source; and modulating the optical pulse signal having two longitudinal modes based on the partial response encoded signal, and outputting a binary RZ modulated signal obtained by the modulation. The transmitted binary RZ modulated signal is input into a receiver. Two partial response components included in the optical spectra of the input signal are divided, and one or both of the divided components are received.