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In fiber transmission systems, optical signals can be degraded by noise light such as amplified spontaneous emission from optical amplifiers and coherent crosstalk light leaking from other channels due to imperfections in switches and/or filters in photonic network nodes. In this paper, we propose a feed-forward control circuit that mitigates such signal degradation in intensity-modulated signals...
We propose and demonstrate a scheme that suppresses degradation induced by in-band crosstalk and amplified spontaneous emission (ASE) noise in differential phase shift keying signal, using feedforward control. Though in-band crosstalk in wavelength division multiplexing networks or ASE from optical amplifiers degrades system performance, we can suppress the degradation using the feedforward control.
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