SOA-EAM frequency up/down-converters for 60-GHz bi-directional radio-on-fiber systems
SOA-EAM frequency up/down-converters for 60-GHz bi-directional radio-on-fiber systems
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DOI：
10.1109/tmtt.2005.863028
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发表时间：
2006-02
影响因子：
4.3
通讯作者：
Jun-Hyuk Seo;Chang-Soon Choi;Y. Kang;Yong‐Duck Chung;Jeha Kim;W. Choi
中科院分区：
文献类型：
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作者：
Jun-Hyuk Seo;Chang-Soon Choi;Y. Kang;Yong‐Duck Chung;Jeha Kim;W. Choi
研究了一种基于单级级联半导体光放大器（SOA）-电吸收调制器（EAM）结构的双向60 GHz波段光纤无线电（RoF）系统的上/下变频器。利用SOA的交叉增益调制和EAM中的光电探测实现上变频，利用EAM的非线性实现下变频。在我们的方案中，60 GHz的本地振荡器（LO）信号和IF信号从一个中心站光传输到基站。我们的频率上/下转换效率的EAM偏置和光LO功率的依赖性。对于频率上转换，获得约8dB的最大转换增益，并且对于频率下转换，测量到大于约18dB的转换损耗。利用这个频率上/下转换器，我们演示了一个60 GHz的双向RoF链路。在100-MHz IF上光发送的下行链路10-Mb/s正交相移键控（QPSK）数据在基站处被上变频到60-GHz频带，并且在60-GHz频带中的上行链路10-Mb/s QPSK数据被下变频到150-MHz IF并发送到中心站。此外，误差矢量幅度的中频信号的功率和波长的依赖关系进行了研究。
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.