KEYWORDS: Digital signal processing, Analog electronics, Signal processing, Transmitters, Radio over Fiber, Distortion, Modulators, Modulation, Dispersion, Clocks
This invited paper discusses the potential of the Intermediate Frequency-over-Fiber (IFoF) technology for future mobile fronthaul links. First, we explain the fundamental of IFoF and its advantages over the conventional digital-based schemes such as Common Public Radio Interface (CPRI) from the point view of centralized radio access network (C-RAN) architecture. Then, our recent results including the experimental demonstration of the 1-Tb/s CPRI-equivalent-rate transmission with a transmitter composed of parallel intensity/phase (IM/PM) modulators are presented.
KEYWORDS: Free space optics, Modulation, Phase shift keying, Receivers, Turbulence, Picosecond phenomena, Free space optical communications, Current controlled current source, Systems modeling, Intermodulation
In this paper, we propose a Free-Space Optical (FSO) system model based on multiple subcarrier modulation
(MSM) using M-ary Phase Shift Keying (M-ary PSK) scheme over Intensity Modulation Direct Detection optical
link. We investigate the impact of aperture averaging on our model across weak-to-strong turbulence regimes
taking into consideration the intermodulation distortion term due to the laser diode non-linearity. By using
a modified model for aperture averaging technique, we also show that there is a design tradeo¤ between the
receiver lens aperture and the required average Carrier-to-Noise and Distortion Ratio to achieve a given average
bit error rate, ensuring substantial scintillation fade reduction.
KEYWORDS: Free space optics, Antennas, Dense wavelength division multiplexing, Radio over Fiber, Modulation, Atmospheric optics, Radio optics, Televisions, Optical amplifiers, Single mode fibers
In this paper we present the design concept plus experimental results and evaluation of a newly developed
advanced DWDM Radio-on-Free-Space Optical (RoFSO) communication system capable of simultaneous transmission
of multiple RF signals. The RoFSO system is evaluated based on the performance metric parameters
defined for the various RF signals comprising of different wireless services including terrestrial digital broadcasting
signals, cellular 3GPP W-CDMA signals, IEEE 802.11 WLAN based signals etc being transmitted over the
RoFSO link. The performance metric parameters being considered include standard optical received power, CNR
and BER characteristics, W-CDMA signal transmission metric parameters like Adjacent Channel Leakage Ratio
(ACLR) and Error Vector Magnitude (EVM), modulation error ratio (MER) for digital terrestrial television
broadcasting signals as well as spectrum mask and EVM for IEEE 802.11 Wireless LAN signal transmission.
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