Abstract
Full-duplex transmission over a 60 GHz radio-on-fiber access system based on the
optical heterodyne technique is verified in this paper. With this technique, an optical
carrier generator on the transmitting side consolidates the functions of wavelength and
polarization control for optical heterodyne detection in uplinks and optical
millimeter-wave generation in downlinks, on behalf of each optical transmitter/receiver.
Therefore, the whole system configuration can be significantly simplified. A full-duplex
1.0 Gbit/s transmission experiment over 10 km of single-mode fiber, which represents an
access network transmission, is demonstrated using the simultaneous
modulation/photodetection operation of an electroabsorption modulator (EAM). Bit error
rates of less than 10<sup>-9</sup> were obtained in both the uplink and downlink without
noticeable mutual interference, even though the laser source and the EAM is shared by
both links, and no significant dispersion-induced degradation was observed. Moreover,
the experimental results showed that an optical link budget of 9.2 dB can be achieved
with the experimental configuration.
© 2008 IEEE
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