KEYWORDS: Orthogonal frequency division multiplexing, Modulation, Optical amplifiers, Modulators, Phase modulation, Signal attenuation, Roads, Telecommunications, Radio over Fiber, Fiber optics
The OFDM-based mm-RoF technique emerges the possibility of cost-effective and high data rate
ubiquitous wireless networks. However, due to the existence of the nonlinear effects, the performance of
OFDM-based mm-RoF meets the limitations. In this paper we analyses the improved performance of a
16QAM-OFDM mm-RoF with predistortion design.
KEYWORDS: Orthogonal frequency division multiplexing, Radio optics, Modulators, Modulation, Radio over Fiber, Single mode fibers, Optical filters, Hybrid fiber radio, Extremely high frequency, Optical amplifiers
This paper introduces in detail a novel 40-GHz radio over fiber (RoF) system based on optical frequency multiplication
with up to 1.4Gbps 16QAM-OFDM wireless signal employing a Mach-Zehnder modulator with no optical filtering. And
also what is discovered as expected during the experiment --- the optimal driving power of the intensity modulator (IM)
to relieve high peak-to-average power ratio (PAPR) of OFDM signal on intensity modulator with an acceptable SNR.
KEYWORDS: Orthogonal frequency division multiplexing, Extremely high frequency, Radio optics, Modulators, Radio over Fiber, Signal detection, Optical amplifiers, Signal attenuation, Fiber amplifiers, Photodiodes
This Letter proposes a low-cost Optical Frequency Multiplication (OFM) scheme based on dual drive Mach-Zehnder
Modulator (DD-MZM) to generate 40-GHz millimeter-Wave (mmW) signals and 32Gbps 64QAM-OFDM signal at the center frequency of 35GHz occupying 5.6GHz bandwidth applied to Radio-over-Fiber (RoF) system. The optimal driving power of Intensity Modulator (IM) is also discovered to achieve the smallest EVM (Error Vector Magnitude) for
the RoF system.
KEYWORDS: Modulation, Orthogonal frequency division multiplexing, Modulators, Signal to noise ratio, Radio over Fiber, Extremely high frequency, Distortion, Signal processing, Antennas, Composites
This paper introduces a new bidirectional mmRoF system based on optical frequency multiplication (OFM) scheme
using dual drive Mach-Zehnder Modulator (DD-MZM) and OFDM modulation. The emphasis is put on the optimization
of optical modulation index to the MZ intensity modulator for OFDM signal with high PAR which imposes a limitation
on the system bit error rate (BER) performance due to the nonlinearity of the MZ modulator. The theoretic analysis on
carrier to composite triple beat ratio is performed. The extension to system BER for QAM format is presented and the
experimental proof is given in a 40 GHz mmRoF system.
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