Adaptive crosstalk cancellation in dense wavelength division multiplexing networks

The LMS algorithm is proposed to cancel received linear crosstalk in dense wavelength division multiplexing (WDM) networks. Analysis and simulations show that with the addition of a few photodetectors, channel spacing requirements are reduced by over 50%. Simulations using a demodulator with Gaussian bandpass characteristics show that a 2.5 dB signal-to-crosstalk ratio is increased to over 35 dB.