title: Demonstration of reconfigurable optical generation of higher-order modulation formats up to 64 QAM using optical nonlinearity.
abstract: We demonstrate a reconfigurable optical transmitter of higher-order modulation formats including pulse-amplitude-modulation (PAM) signals and quadrature-amplitude-modulation (QAM) signals. We generated six different modulation formats by multiplexing 10 Gbit/s on-off-keying (OOK) signals (10 Gbaud binary phase-shift keying, 4-PAM, 8-PAM quadrature phase-shift keying (QPSK), 16-QAM and 16-star-QAM with error-vector magnitudes (EVMs) of 8.1%, 7.5%, 7.8%, 8.2%, 7.2%, and 6.9%, respectively) and 80 Gbit/s 16-QAM with an EVM of 8.5%, as well as 120 Gbit/s 64-QAM with an EVM of 7.1%, using two or three 40 Gbit/s QPSK signals, respectively. We also successfully transmitted the generated 16-QAM signals through a 100 km transmission line with negligible power penalty.
authors.affiliation: Department of Electrical Engineering, University of Southern California, Los Angeles, California 90089, USA. chitgarh@usc.edu
authors.forename: Mohammad Reza
authors.initials: MR
authors.lastname: Chitgarha
authors.forename: Salman
authors.initials: S
authors.lastname: Khaleghi
authors.forename: Zahra
authors.initials: Z
authors.lastname: Bakhtiari
authors.forename: Morteza
authors.initials: M
authors.lastname: Ziyadi
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: Alan E
authors.initials: AE
authors.lastname: Willner