Patent ID: 7024121

Claim:
An optical clock distribution system in a WDM network comprising: an optical clock generator converting a clock signal of PRC (Primary Reference Clock) level into an optical clock signal having a wavelength λ 0 ; a wavelength multiplexer wavelength-multiplexing said optical clock signal having wavelength λ 0 together with other optical wavelength data; a wavelength-demultiplexer provided in a unit of said network, wavelength-demultiplexing said optical clock signal having wavelength λ 0 ; a wavelength converter performing wavelength conversion to said optical clock signal having a wavelength λ 0 from said clock signal to which indication information is attached, wherein said other optical wavelength data are processed in said unit of the network using said wavelength-demultiplexed optical clock signal having wavelength λ 0 as a reference clock.