SOA-EAM frequency up/down-converters for 60-GHz bi-directional radio-on-fiber systems

We investigate a frequency up/down-converter based on a single cascaded semiconductor optical amplifier (SOA)-electroabsorption modulator (EAM) configuration for bi-directional 60-GHz-band radio-on-fiber (RoF) system applications. SOA cross-gain modulation and photodetection in EAM are used for freq...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2006-02, Vol.54 (2), p.959-966
Main Authors: Seo, Jun-Hyuk, Choi, Chang-Soon, Kang, Young-Shik, Chung, Yong-Duck, Kim, Jeha, Choi, Woo-Young
Format: Article
Language:English
Subjects:
Base stations
Bidirectional control
Electroabsorption modulator (EAM)
Frequency conversion
Frequency measurement
millimeter-wave communication
Optical frequency conversion
Optical losses
optical mixers
Optical modulation
Quadrature phase shift keying
radio-on-fiber (RoF) system
semiconductor optical amplifier (SOA)
Semiconductor optical amplifiers
Service oriented architecture
Stimulated emission
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Summary:We investigate a frequency up/down-converter based on a single cascaded semiconductor optical amplifier (SOA)-electroabsorption modulator (EAM) configuration for bi-directional 60-GHz-band radio-on-fiber (RoF) system applications. SOA cross-gain modulation and photodetection in EAM are used for frequency up-conversion, and EAM nonlinearity is used for frequency down-conversion. In our scheme, both 60-GHz local-oscillator (LO) signals and IF signals are optically transmitted from a central station to base stations. We characterize the dependence of frequency up/down-conversion efficiencies on EAM bias and optical LO power. For frequency up-conversion, maximum conversion gain of approximately 8 dB was obtained and, for frequency down-conversion, more than approximately 18-dB conversion loss was measured. Utilizing this frequency up/down converter, we demonstrate a 60-GHz bi-directional RoF link. Optically transmitted downlink 10-Mb/s quadrature phase-shift keying (QPSK) data at 100-MHz IF are frequency up-converted to the 60-GHz band at the base station, and uplink 10-Mb/s QPSK data in the 60-GHz band are frequency down-converted to 150-MHz IF and transmitted to the central station. In addition, the dependence of error vector magnitudes on IF signal power and wavelength is investigated.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2005.863028