Abstract
A 4×4 multiple-input multiple-output coherent microwave photonic
(MWP) link to transmit four wireless signals with an identical microwave
center frequency over a single optical wavelength based on optical
independent sideband (OISB) modulation and optical orthogonal modulation
with an improved spectral efficiency is proposed and experimentally
demonstrated. At the transmitter, the OISB modulation and optical
orthogonal modulation are implemented to generate an OISB signal using a
dual-parallel Mach–Zehnder modulator (DP-MZM) driven by four microwave
orthogonal frequency-division multiplexing (OFDM) signals with an
identical microwave center frequency. At the receiver, the OISB signal is
coherently detected at a coherent receiver where a free-running local
oscillator (LO) laser source is employed. Digital signal processing is
then used to recover the four OFDM signals, to eliminate the phase noise
from the transmitter laser source and the LO laser source, and to cancel
the unstable wavelength difference between the wavelengths of the
transmitter laser source and the LO laser source. Error-free transmission
of three 16 quadrature amplitude modulation (16-QAM) 1 Gbps OFDM signals
and one 16-QAM 1.5 Gbps OFDM signal at a microwave center frequency of
2.91 GHz over a 10 km single-mode fiber is experimentally
demonstrated.
© 2017 Chinese Laser Press
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