Abstract
In this paper we demonstrate high-baud generation and transmission of
PDM-64QAM signals. The 64QAM signal is generated using one single in-phase/quadrature
(I/Q) modulator driven with eight-level signals synthesized by all binary
electrical inputs. With hard-decision forward error correction (HD-FEC), we
first demonstrate 11.2-GBd and 22.4-GBd PDM-64QAM transmissions over 320-km
standard single mode fiber (SSMF). Then we specifically introduce a long memory
filter (LMF) and prove its effectiveness in reflection compensation both theoretically
and experimentally. With the aid of soft-decision FEC (SD-FEC), optical pre-shaping,
and LMF, we transmit a 41.4-GBd PDM-64QAM signal over 1200-km SSMF. Finally,
using per-channel 41.6-GBd PDM-64QAM with SD-FEC, we successfully demonstrate
50-GHz-spaced, 8 × 499-Gb/s transmission over 720-km SSMF. This is the first demonstration
of400-Gb/s/ch WDM transmission on the 50-GHz ITU grid that uses a per-channel
single-carrier scheme.
© 2013 IEEE
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