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 ~25°C and the EAM reverse bias, V<sub>R</sub>
~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-Ω 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<sup>2/3</sup> while that of the narrowband EAM module showed
82 dB · Hz<sup>2/3</sup>. 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.
© 2008 IEEE
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