TY - JOUR
T1 - A method for generating arbitrary optical signal constellations using direct digital drive
AU - Ehrlichman, Yossef
AU - Amrani, Ofer
AU - Ruschin, Shlomo
PY - 2011
Y1 - 2011
N2 - A digitally operated optical quadrature-amplitude modulation (QAM) modulator based on a single multielectrode Mach-Zehnder modulator is presented. Generation and performance of 64QAM are studied in detail. Simulation results show that a single modulator with 13 electrodes, each of which is driven by either one of the voltages 0 or 1.68vπ, provides close-to-ideal 64QAM constellation despite the inherent nonlinearity of the modulator. Moreover, employing a sufficient number of electrodes, close to ideal error performance can be obtained for any constellation order, or shape. Simulations results are demonstrated for several different square constellations: 16QAM and 256QAM, and nonsquare constellations: 32QAM and 128QAM. A brief discussion on the utilization of the proposed scheme as a predistorter is also given.
AB - A digitally operated optical quadrature-amplitude modulation (QAM) modulator based on a single multielectrode Mach-Zehnder modulator is presented. Generation and performance of 64QAM are studied in detail. Simulation results show that a single modulator with 13 electrodes, each of which is driven by either one of the voltages 0 or 1.68vπ, provides close-to-ideal 64QAM constellation despite the inherent nonlinearity of the modulator. Moreover, employing a sufficient number of electrodes, close to ideal error performance can be obtained for any constellation order, or shape. Simulations results are demonstrated for several different square constellations: 16QAM and 256QAM, and nonsquare constellations: 32QAM and 128QAM. A brief discussion on the utilization of the proposed scheme as a predistorter is also given.
KW - Direct digital drive
KW - Mach-Zehnder
KW - quadrature amplitude modulation (QAM)
UR - http://www.scopus.com/inward/record.url?scp=80051897450&partnerID=8YFLogxK
U2 - 10.1109/JLT.2011.2160449
DO - 10.1109/JLT.2011.2160449
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AN - SCOPUS:80051897450
SN - 0733-8724
VL - 29
SP - 2545
EP - 2551
JO - Journal of Lightwave Technology
JF - Journal of Lightwave Technology
IS - 17
M1 - 5934353
ER -