Abstract
The integration of passive optical network (PON) and radio-over-fiber (ROF) networks could provide broadband services for both fixed and mobile users in a single and low-cost platform. Combining the long-reach (LR)-PON (>100 km) and the LR-ROF can further reduce the cost by simplifying the network architecture, sharing the same optical components and extending the coverage of ROF network. However, the transmission and distribution of ROF signal in LR network is very challenging due to the chromatic dispersion generated periodic power fading and code time-shifting effects in the optical fiber. In this work, we propose and experimentally demonstrate a LR-ROF signal distribution using single-sideband (SSB)-ROF signal generated by a silicon ring-modulator. The silicon modulator is compact and has low power consumption. Besides, one unique feature of the silicon ring-modulator is that it only modulates the signal wavelength at the resonant null. This makes it very suitable for the generation of the SSB-ROF signal. Numerical comparison of the SSB-ROF with the double-sideband (DSB)-ROF and optical carrier suppress (OCS)-ROF signals; as well as the fabrication of the silicon ring-modulator will be discussed.
Highlights
Extensions and enhancements for the present passive optical network (PON) for providing higher data rate with simplified network architectures have been the subject of research recently [1,2,3,4]
This is because the ROF signal is generated by the coherent beating between the continuous wave (CW) and data-carrying sideband, and the radio frequency (RF) power fading effect and the code time-shifting effect occurring in DSB and optical carrier suppress (OCS) ROF signals can be mitigated
The integration of the long-reach PON (LR-PON) and the LR-ROF is a promising architecture in future networks
Summary
Extensions and enhancements for the present passive optical network (PON) for providing higher data rate with simplified network architectures have been the subject of research recently [1,2,3,4]. In the commonly used double-sideband (DSB) with carrier ROF signal, propagation of the three optical tones (optical carrier and the two sidebands) in fiber results in repetitive, length dependent power fluctuation in the received signal (called power fading effect) [6,7]. Schemes such as remote up-conversion at the remote node using opticalelectrical-optical (OEO) [8] or four-wave-mixing (FWM) in a semiconductor optical amplifier (SOA) [9] can effectively extend the ROF transmission distance. Experimental demonstration of the LR distribution of the SSB-ROF signal shows that error free 100 km single mode fiber (SMF) transmission can be achieved
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