Nonlinearity and Noise Effects in Multi-Level Signal Millimeter-Wave Over Fiber Transmission Using Single and Dual Wavelength Modulation

We transmit multilevel quadrature amplitude modulation (QAM) data-IEEE 802.16 schemes-at 20 MSps and an orthogonal frequency-division multiplexing (OFDM) 802.11 g signal (54 Mbps) with a 25 GHz millimeter-wave over fiber system, which employs a dual wavelength source, over 20 km of single mode fiber...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2010-11, Vol.58 (11), p.3189-3198
Main Authors: James, J, Pengbo Shen, Nkansah, A, Xing Liang, Gomes, N J
Format: Article
Language:English
Subjects:
Amplifiers
Data transmission
DWDM thin film filter
Fibers
Millimeter wave measurements
Millimeter wave technology
millimeter-wave over fiber system
Noise
Nonlinearity
Optical modulation
optical phase modulator
Optical receivers
Quadrature amplitude modulation
Radio frequencies
Spontaneous emission
Wavelengths
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Summary:We transmit multilevel quadrature amplitude modulation (QAM) data-IEEE 802.16 schemes-at 20 MSps and an orthogonal frequency-division multiplexing (OFDM) 802.11 g signal (54 Mbps) with a 25 GHz millimeter-wave over fiber system, which employs a dual wavelength source, over 20 km of single mode fiber. Downlink data transmission is successfully demonstrated over both optical and wireless (up to 12 m) paths with good error vector magnitude. An analysis of two different schemes, in which data is applied to one (single) and both (dual) of the wavelengths of a dual wavelength source, is carried out. The system performance is analyzed through simulation and a good match with experimental results is obtained. The analysis investigates the impact of Mach-Zehnder modulator (MZM) and RF amplifier nonlinearity and various noise sources, such as laser relative intensity noise, amplified spontaneous emission, thermal, and shot noise. A comparison of single carrier QAM IEEE 802.16 and OFDM in terms of their sensitivity to the distortions from MZM and RF amplifier nonlinearity is also presented.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2010.2076650