Patent ID: 8280248

Claim:
A method for monitoring a channel-associated signal, comprising: spectrum-spreading the channel-associated signal, by a loading point, with a spread spectrum code corresponding to the loading point, to obtain a channel-associated identification signal of the loading point; modulating a passing optical service signal, by the loading point, with the channel-associated identification signal, to obtain a modulated optical signal; splitting the modulated optical signal from an upstream node, by a detecting point, and converting a split optical signal into an electric signal; and de-spreading the electric signal, by the detecting point, with the spread spectrum code corresponding to the loading point to be monitored, to obtain the channel-associated signal of the loading point to be monitored corresponding to the spread spectrum code; a period of the channel-associated identification signal is greater than or equal to a preset multiple of the period of the optical service signal; and a modulation depth of the optical service signal modulated with the channel-associated identification signal is smaller than or equal to a preset adjustment value, wherein the method for monitoring the channel associated signal further comprises of detecting the de-spread signal, by the detecting point, and feeding back a detection result to the corresponding loading point.