KEYWORDS: Radio over Fiber, Modulation, Modulators, Signal detection, Eye, Sensors, Integrated optics, Signal attenuation, Telecommunications, Microwave radiation
A novel photonic method which employs the optical carrier suppression (OCS) scheme and
an optical I/Q modulator to generate millimetre-wave band vector signals for 60GHz RoF
systems is proposed. The generation of 2.5G Symbol/sec 16-QAM signal at 60GHz band is
simulatively demonstrated as an example.
An optical-domain wideband microwave amplification system which takes advantage of the
large bandwidth capacity of optical devices to amplify optically carried microwave signals is proposed. A
comprehensive theoretical model of the system including link gain, noise and spur-free dynamic range
(SFDR) is established, with which all kinds of performance of the system can be analyzed conveniently for
given system parameters. Based on the theoretical model, an experiment platform for the microwave
amplification system is established. The source microwave signal is modulated up to the optical domain by
carrier-suppressed modulation in a Mach-Zehnder intensity modulator (MZM) whose DC bias voltage is
controlled by an automatic-bias-voltage-control (ABVC) module. The output optical signal from the MZM
is amplified by a commercial erbium-doped-fiber-amplifier (EDFA) and then passes an optical band-pass
filter (OBPF) to filter out out-band amplified spontaneous emission (ASE) noise. Finally the optical signal
is fed into a photo-detector (PD) and the amplified microwave signal is obtained at the output of it. Owning
to the wide gain spectrum and the large small-signal gain of the EDFA, wideband microwave gain which is
larger than 17 dB is obtained over 12GHz-bandwidth. The microwave gain is quite stable while the input
microwave power varies from -60 dBm to -15 dBm and the input microwave frequency is tuned from 100
MHz to 12 GHz. The noise floor is approximately -137 dBm /Hz, which is mainly caused by the ASE noise
brought in by the EDFA. The SFDR of the system is third-order inter-modulation dominated and is
measured to be 113.1dB•Hz2/3.
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