Abstract
In this paper, we propose a novel synthesizing method for high-speed 8-ary
quadratic-amplitude modulation (QAM) optical signal generation using
commercial optical modulators with binary electrical driving signals. Using
this method, we successfully generated 114-Gb/s pulse-duration modulation
(PDM)-8QAM optical signals. Intradyne detection of PDM-8QAM optical signals
with robust blind polarization demultiplexing has been demonstrated by using
a new cascaded multimodulus equalization algorithm. With
return-to-zero-shaped PDM-8QAM modulation and the proposed blind
polarization demultiplexing algorithm, we demonstrate transmission of a
record 32-Tb/s fiber capacity (320$\,\times\,$114 Gb/s) over 580 km of ultralow-loss single-mode fiber-28 fiber
by utilizing ${\rm C}+{\rm L}$-band erbium-doped fiber-amplifier-only optical amplification and
single-ended coherent detection technique at an information spectral
efficiency of 4.0 bit/s$\cdot$Hz.
© 2010 IEEE
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