Abstract
We propose and experimentally demonstrate generation of optical
carrier suppressed-optical differential phase-shift keying (OCS-oDPSK) modulation
format in radio-over-fiber (RoF) systems using one single-drive Mach–Zehnder
modulator (MZM). This scheme realizes up-conversion of baseband data for downlink
wireless service delivery, generation of remote local oscillator (LO) signal
for down-conversion of uplink radio frequency (RF) signal, and remodulation
of down-converted uplink data, thus lowering the cost of base stations (BSs)
in full-duplex RoF systems. The proposed scheme is expected to be simple and
compact due to the use of a single MZM. Furthermore, the OCS-oDPSK generation
principle is extended to obtain an OCS-optical differential quadrature phase-shift
keying (OCS-oDQPSK) signal by employing a dual-parallel MZM (DPMZM), which
is useful to deliver multiple wireless services on the same RF carrier.
© 2008 IEEE
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