Abstract
Multi-wavelength optical single-sideband (OSSB) modulation for wavelength-division-multiplexed
radio-over-fiber (WDM-RoF) systems using a twin-core fiber (TCF) is proposed and demonstrated in this study. A TCF
shows a periodic transmission spectrum due to the inherent coupling between the cores. Optical double-sideband (ODSB)
signals generated by a Mach–Zehnder modulator pass through the TCF to realize multi-wavelenth OSSB modulation
for WDM-RoF systems. Due to the negative slope of the TCF transmission spectrum, the upper-sideband experiences higher
attenuation than the lower-sideband for each wavelength channel. In addition, the optical carrier-to-sideband ratio
(OCSR) also can be optimized, simultaneously, which can enhance the transmission performance of RoF links. The
performance analysis of the proposal is carried out via simulations, results show that the receiver sensitivity is
improved 10.35 dB with OCSR reducing from 12.48 to 6.89 dB. The RF power fluctuation also can be optimized
by employing the TCF to suppress the upper-sidebnd (or lower-sideband).
© 2014 IEEE
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