Patent ID: 7376348
Filing Date: 2008-05-20
Classification: H04B,H04J

Abstract:
1. An optical communication system having a sending unit transmitting multiplexed optical signals, in which optical signals are multiplexed with wavelength division multiplexing, to a receiving unit through either one of a main transmission line or a backup transmission line, and a receiving unit receiving the optical signal transmitted from a sending unit from either one of the main transmission line or the backup transmission line, the said sending unit comprising: a pre-emphasis section adjusting signal levels of each wavelength; a transmitter multiplexing each wavelength signal of which level is adjusted by the pre-emphasis section, and sending the multiplexed wavelength signal; and a controller controlling the pre-emphasis section to adjust each wavelength signal level, based on control data transmitted from the receiving unit for adjusting each wavelength signal level, and the said receiving unit comprising: