Abstract
This paper proposes and analyzes a quadrature duobinary modulation format
with coherent detection for high-spectral efficiency
wavelength-division-multiplexing transmission systems at 112 Gb/s per
channel. A practical system design of a dual polarization quadrature
duobinary (DP-QDB) format with coherent heterodyne detection is analyzed and
compared with the DP-differential quadrature phase-shift keying format for
feasibility of 112 Gb/s transmission. Using simulation analysis, we show
that the relatively narrow spectrum of quadrature duobinary modulation
provides an effective practical means for realizing high-spectral efficiency
transmission, approaching the theoretical limit of 4 bits/s/Hz, while also
providing excellent tolerance to optical filter cascades for a robust
optical networking functionality.
© 2009 IEEE
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