Patent ID: 6486985
Filing Date: 2002-11-26
Classification: H04B,H04J,H04L

Abstract:
A method for transmitting an additional data signal and a useful data signal in an optical network, the method comprising the steps of:converting, at a transmission end, the additional data signal into a coded additional data signal having a smaller amplitude than that of the useful data signal and having defined code sequences, each of the defined code sequences including a plurality of chips and having a lower chip frequency than a bit frequency of the useful data signal; superimposing the coded additional data signal on the useful data signal to form a summed signal; transmitting the summed signal; separating the coded additional data signal from the useful data signal at a reception end; comparing the coded additional data signal with the defined code sequences; reconverting the coded additional data signal into the additional data signal; and outputting the additional data signal as an additional signal.