title: Demonstration of tunable optical generation of higher-order modulation formats using nonlinearities and coherent frequency comb.
abstract: We demonstrate a tunable, optical generation scheme of higher-order modulation formats including pulse amplitude modulation (PAM) and quadrature amplitude modulation (QAM). Using this method, 100.4 Gbit/s 16-QAM and 120 Gbit/s 64-QAM were generated from 50.2 and 40 Gbit/s QPSK signals at EVMs of 7.8% and 6.4%, and 60 Gbit/s 8-PAM were generated at an EVM of 8.1% using three 20-Gbit/s BPSK signals. We also demonstrated a successful transmission of 80 Gbit/s 16-QAM through 80 km SMF-28 after compensating with 20 km DCF. All signals were generated, transmitted, and detected with BER below the forward error correction threshold.
authors.forename: Mohammad Reza
authors.initials: MR
authors.lastname: Chitgarha
authors.forename: Salman
authors.initials: S
authors.lastname: Khaleghi
authors.forename: Morteza
authors.initials: M
authors.lastname: Ziyadi
authors.forename: Ahmed
authors.initials: A
authors.lastname: Almaiman
authors.forename: Amirhossein
authors.initials: A
authors.lastname: Mohajerin-Ariaei
authors.forename: Ori
authors.initials: O
authors.lastname: Gerstel
authors.forename: Loukas
authors.initials: L
authors.lastname: Paraschis
authors.forename: Carsten
authors.initials: C
authors.lastname: Langrock
authors.forename: Martin M
authors.initials: MM
authors.lastname: Fejer
authors.forename: Joseph
authors.initials: J
authors.lastname: Touch
authors.forename: Alan E
authors.initials: AE
authors.lastname: Willner