Abstract
We summarize our experimental exploration of the capabilities of an
ultrabroad-bandwidth plasmonic Mach-Zehnder modulator (MZM), in an
intensity modulation and direct detection (IM/DD) system for short-reach
optical transmission up to 10 km. We study modulation, transmission, and
reception of ultrahigh-symbol-rate (up to 304 GBd) multi-level optical
signals with two different signaling schemes: pulse amplitude modulation
(PAM), with up to 8 amplitude levels and partial-response-encoded binary
(polybinary) modulation with memory length up to 4. By mapping the
performance to a concatenated soft-decision (SD) and hard-decision (HD)
forward error correction (FEC) coding scheme, a net bitrate of 363.4
Gbit/s is possible with PAM-8 signaling and 279.0 Gbit/s with tetrabinary
(polybinary) signaling after 10 km standard single-mode fiber
transmission. Considering an HD-only coding scheme, a net bitrate of 318.0
Gbit/s is possible with PAM-6 and 277.1 Gbit/s with
tetrabinary.
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