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Updated: May 8, 2026
Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
Demonstration of reconfigurable optical generation of higher-order modulation formats up to 64 QAM using optical
Mohammad Reza Chitgarha1, Salman Khaleghi, Zahra Bakhtiari
1Department of Electrical Engineering, University of Southern California, Los Angeles, California 90089, USA. chitgarh@usc.edu
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.
