Abstract
This paper investigates the combined feed-forward and decision-feedback equalizer (DFE) in a lightwave system
with optical amplifiers and a direct-detection receiver. Based on a nonlinear channel model, the paper provides a
modification of the classical minimum mean square error theory of the DFE. Furthermore, an analytical method that is
capable of accurate bit error rate (BER) evaluation is used to optimize the DFE for minimum BER. The paper evaluates
the DFE performance for both optical on–
off keying and duobinary modulation formats in the presence of chromatic
dispersion as well as the DFE performance for the mitigation of higher order polarization mode dispersion in
first-order compensated systems. The paper shows that the DFE can compensate for the BER degradation due to
narrow-band receiver-side optical filtering and can significantly improve the spectral efficiency of dense
wavelength-division multiplexed systems.
© 2007 IEEE
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