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

Research output: Contribution to journalArticle

74 Citations (Scopus)

Abstract

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
Volume54
Issue number2
DOIs
Publication statusPublished - 2006 Feb 1

Fingerprint

down-converters
Electroabsorption modulators
Semiconductor optical amplifiers
light amplifiers
modulators
fibers
Fibers
Quadrature phase shift keying
Base stations
stations
quadrature phase shift keying
Conversion efficiency
Frequency bands
Telecommunication links
Modulation
oscillators
Wavelength
nonlinearity
modulation

All Science Journal Classification (ASJC) codes

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

Seo, Jun Hyuk ; Choi, Chang Soon ; Kang, Young Shik ; Chung, Yong Duck ; Kim, Jeha ; Choi, Woo Young. / SOA-EAM frequency up/down-converters for 60-GHz Bi-directional radio-on-fiber systems. In: IEEE Transactions on Microwave Theory and Techniques. 2006 ; Vol. 54, No. 2. pp. 959-966.
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SOA-EAM frequency up/down-converters for 60-GHz Bi-directional radio-on-fiber systems. / Seo, Jun Hyuk; Choi, Chang Soon; Kang, Young Shik; Chung, Yong Duck; Kim, Jeha; Choi, Woo Young.

In: IEEE Transactions on Microwave Theory and Techniques, Vol. 54, No. 2, 01.02.2006, p. 959-966.

Research output: Contribution to journalArticle

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AB - 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.

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