Abstract
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. Our scheme is an optical/electrical hybrid circuit consisting of
an optical coupler, photo-detector, and Mach–Zehnder intensity modulator
(MZ-mod). The transmissivity of the MZ-mod is used to suppress fluctuations
in the “on” signal state. In addition, the proposed circuit also
improves the extinction ratio by adjusting the operating conditions.
© 2012 IEEE
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