Signal generating circuit and a signal receiving circuit, a signal generating circuit, an optical signal transmitter, signal receiver, an optical signal synchronization establishing method, and an optical signal synchronization system,

摘要

In the communication system by the synchronous detection using an optical signal, even for a signal arrival time deviates greatly depending on frequency by the wavelength dispersion, and allow the signal position detection, frequency error compensation, clock error compensation, chromatic dispersion estimation . It is possible to generate a specific frequency band signal with a power which is concentrated in particular more than one frequency, the optical signal transmitter transmits a signal including the specific frequency band signals. The converted signal into a digital signal that is received, and detects the position of the specific frequency band signals from the digital signal converted, by estimating the frequency location of the specific frequency band signal is detected, the optical signal receiving device, the light I detects the frequency shift of the optical signal transmitter between the signal receiving apparatus. Furthermore, the frequency spacing of the position specified frequency band signal is estimated, the optical signal receiving device detects a clock shift of the optical signal transmitter between the optical signal receiving apparatus. Furthermore, the difference between the time position of the specific frequency band signal for estimating the time position of the specified frequency band signal is detected, corresponding to different frequencies, the optical signal receiving apparatus detects the amount of chromatic dispersion.