| 摘要 |
Data is transmitted using multiple phase-modulated optical wavelength division multiplexed signals carrying respective synchronous data packet sequences. The data packet sequences comprise data packets within respective data packet time slots. The data packet time slots are separated by guard band time slots. Within at least one of the optical WDM signals, a data packet is detected.A time-discrete electrical signal is derived from the one optical WDM signal, by down converting the one optical WDM signal using a local oscillator optical signal. A first discrete spectral component of the time-discrete electrical signal is determined, which corresponds to a direct current component of the time-discrete electrical signal.A second discrete spectral component of the time-discrete electrical signal is determined, which corresponds to a symbol rate of the one optical WDM signal. A data packet is detected, in the case that a fraction between the spectral components exceeds a predefined threshold. |
