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

Jun Hyuk Seo, Chang Soon Choi, Young Shik Kang, Yong Duck Chung, Jeha Kim, Woo Young Choi

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80 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)959-966
Number of pages8
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number2
Publication statusPublished - 2006 Feb

Bibliographical note

Funding Information:
Manuscript received April 1, 2005; revised August 11, 2005. This work was supported by the Ministry of Science and Technology of Korea under the National Research Laboratory Program. J.-H. Seo and W.-Y. Choi are with the Department of Electrical and Electronic Engineering, Yonsei University, Seoul 120-749, Korea (e-mail: C.-S. Choi was with the Department of Electrical and Electronic Engineering, Yonsei University, Seoul 120-749, Korea. He is now with the National Institute of Information and Communication Technology, Yokosuka 239-0847, Japan. Y.-S. Kang, Y.-D. Chung, and J. Kim are with the Electronics and Telecommunications Research Institute, Daejeon 305-350, Korea. Digital Object Identifier 10.1109/TMTT.2005.863028

All Science Journal Classification (ASJC) codes

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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