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60-GHz System-on-Packaging Transmitter for Radio-Over-Fiber Applications

Authors
Kim, JehaChung, Yong-DuckChoi, Kwang-SeongShin, Dong-SooSim, Jae-ShikYu, Hyun-Kyu
Issue Date
Jul-2008
Publisher
Optical Society of America
Keywords
Electroabsorption modulator; impedance matching; low-noise amplifier; microstrip-line bandpass filter; noise figure; RF gain; RF packaging; 60-GHz radio-over-fiber (ROF); 64-quadrature amplitude modulation (QAM); spurious free dynamic range; system-on-packaging (SOP) transmitter
Citation
Journal of Lightwave Technology, v.26, no.13-16, pp.2379 - 2387
Indexed
SCIE
SCOPUS
Journal Title
Journal of Lightwave Technology
Volume
26
Number
13-16
Start Page
2379
End Page
2387
URI
https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/42315
DOI
10.1109/JLT.2008.927190
ISSN
0733-8724
Abstract
Using ultra-high-speed electroabsorption modulator (EAM) devices for RF/optic conversion, we fabricated system-on-packaging (SOP) transmitter (Tx) modules and characterized their performance in 60-GHz RF/radio-over-fiber (ROF) applications. Both an EAM and low-noise amplifiers (LNAs) were co-packaged with internal bias circuits into a butterfly-type metal housing. At the EAM temperature, T similar to 25 degrees C and the EAM reverse bias, V-R similar to 1.6 V was the largest RF gain obtained that was very susceptible to the change of T. The impedance matching in the 60-GHz band was accomplished with both a microstrip-line bandpass filter and a 500-Omega shunt resistor, which defined the 2-GHz passband of the SOP transmitter. In 60-GHz two-tone experiments, we observed that the spurious free dynamic range of an SOP module with two LNAs was 78 dB. Hz(2/3) while that of the narrowband EAM module showed 82 dB. Hz(2/3). In contrast, the noise figure exhibited a large reduction of up to 30 dB for the SOP module compared with the narrowband EAM module. Using the SOP Tx module, we achieved successful transmission of commercial high-definition digital CATV signals in 64-quadrature amplitude modulation (QAM) format through the 60-GHz RF/ROF link. The total throughput of the link was estimated to be 6.5 Gb/s.
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COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY (DEPARTMENT OF PHOTONICS AND NANOELECTRONICS)
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