Patent ID: 8190033

Claim:
A wavelength drift detecting apparatus, comprising: a wavelength locking module, configured to: receive optical signals that are output by a plurality of optical modules and multiplexed, and output the optical signals in two channels, wherein one channel of signals comprises unprocessed signals, the other channel of signals has undergone comparative processing through a wavelength etalon, and each channel has only one optical signal that carries identifier information, wherein the only one optical signal carrying identifier information from each channel is a signal that has undergone code division scrambling; and a signal processing module, configured to: receive the two channels from the wavelength locking module, extract a signal that carries the identifier information from each channel, and calculate a wavelength drift value of the optical signals output by the plurality of optical modules based on a power of two signals that carry the identifier information, and wherein the signal processing module comprises: a code division signal extracting unit, configured to: extract the signal that carries the identifier information from each channel, and transmit the signal carrying the identifier information to the calculating unit; and a calculating unit, configured to: determine the power of the two signals that carry the identifier information from the identifier signal extracting unit, and calculate the wavelength drift value of the optical signals output by the plurality of optical modules based on the power of the two signals.