Abstract
An optical-heterodyne-detection method for a 60-GHz radio-on-fiber uplink is proposed and verified in this
paper. The main point of this proposal is that all the functions needed for the optical heterodyne detection, i.e.,
the local/carrier light sources, the automatic frequency control of these light sources, and a
polarization-diversity-detection circuit, are consolidated in one transmitting-side module to realize a simple
system configuration. This proposal realizes an adequate optical uplink budget with low-cost optical receivers that
consist of just one IF-band photodetector and one envelope detector. A 1.0-Gb/s transmission experiment over 10 km
of single-mode fiber, which represents access-network transmission, is demonstrated using a 61.0-GHz
amplitude-shift-keying signal as a 60 GHz-band uplink signal. A BER of less than
10<sup>-9</sup> was obtained at an uplink SSB signal power of
-40 dBm regardless of the polarization state of the optical uplink signal, and no significant
dispersion-induced degradation was noted.
© 2007 IEEE
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