Abstract
Known hybrid orthogonal frequency division multiplexing-digital filter multiple access (OFDM-DFMA) PONs show promise of seamless and cost-effective convergence of optical and mobile networks for 5G and beyond. This paper reports, for the first time, a new hybrid OFDM-DFMA PON based on intensity modulation and direct detection (IMDD), obtained by modifying digital signal processing (DSP) algorithms embedded in both the OLT and ONUs. The proposed PON allows two spectrally overlapped sub-bands to occupy each individual sub-wavelength spectral region to independently transmit upstream ONU information. A model of the proposed PON is developed and its upstream transmission performances are numerically explored for different application scenarios. Compared with the previously published PON, the proposed PON doubles the number of supported ONUs and provides >1.7-fold aggregate upstream signal transmission capacity increases with 2.2-fold aggregate upstream signal transmission capacity increases and >0.7 dB upstream power budget improvements are achievable. The performance improvements vary by <; 18% for a transmission distance range as large as 50 km. In addition, the proposed PON is tolerant to finite digital filter tap length-induced channel interferences.
Highlights
The evolution and accelerating increase in the number of smart mobile devices, stoked by new content-rich services and highly dynamic on-demand bandwidth-hungry video-centric mobile services [1], [2], have made cloud radio access networks (C-RANs) a key enabler for 5G and beyond networks [3]
Cost effective high-speed 5G C-RANs can be based on intensity modulation and direct detection in a passive optical network (IMDD PON) [4], [5]
We show that spectral efficiency can be reclaimed with a new variant of the hybrid orthogonal frequency division multiplexing (OFDM)-Digital filter multiple access (DFMA) PON, in which the digital signal processing (DSP) algorithms embedded in both the optical line terminal (OLT) and optical network unit (ONU) are slightly modified to allow two spectrally overlapped sub-bands to occupy each individual sub-wavelength for independent upstream transmission of ONU information
Summary
The evolution and accelerating increase in the number of smart mobile devices, stoked by new content-rich services and highly dynamic on-demand bandwidth-hungry video-centric mobile services [1], [2], have made cloud radio access networks (C-RANs) a key enabler for 5G and beyond networks [3]. A comparatively low DSP complexity IMDD PON with inherent transparency to 4G mobile networks, termed hybrid orthogonal frequency division multiplexing (OFDM)-DFMA PON, has been proposed and investigated [14] For upstream transmission, this PON applies an ONU DSP procedure similar to the DFMA-PON, i.e., each ONU uses its embedded digital in-phase (referred to as I-phase throughout the paper) shaping filter to locate its OFDM signal at an assigned radio frequency spectral region (referred to as sub-wavelength throughout the paper). (nearly double) signal transmission capacity and spectral efficiency It retains the properties of earlier hybrid OFDM-DFMA PONs, namely, lower OLT DSP complexity, inherent transparency to 4G networks and performance robustness to physical-layer network design factors such as digital filter variations, channel crosstalk and transmission impairments as well as transceiver sample timing offset. The aforementioned performances of the proposed PON are similar to those of a recently published PON termed hybrid single sideband OFDM-DFMA PON [15], whose ONU DSP complexity is, significantly higher than the proposed PON
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
