Abstract
In PON-based mobile fronthauls, direct inter-ONU communications without passing end-user traffic to the OLT offer a promising solution for fulfilling the stringent latency and bandwidth requirements of 5G and beyond networks. In this paper, with slight modifications to the PON remote node, a concurrent inter-ONU and upstream communication technique is proposed and experimentally demonstrated in 101.6Gbit/s multipoint-to-point hybrid SSB OFDM digital filter multiple access (DFMA) IMDD PONs over 25km SSMFs. Multiple gapless inter-ONU and upstream SSB signals are aggregated by digital orthogonal filtering in each ONU transmitter. A single FFT operation is applied for demultiplex and demodulation in the OLT/ONU receivers. The results show that for both the inter-ONU and upstream transmissions, the optimum length of digital filters is 32, based on which the power penalties due to the fiber transmission and ONU channel interference are 30% improvements in aggregated signal transmission capacity. In addition, detailed experimental investigations are also undertaken of the trade-off between differential ONU optical launch power dynamic range and aggregated signal transmission capacity. An approximately 1dB increase in ONU launch power dynamic range is achievable by reducing the aggregated signal transmission capacity by 5Gbit/s.
Highlights
The experimental results show that the intensity modulation and direct detection (IMDD) hybrid single sideband (SSB) orthogonal frequency division multiplexing (OFDM)-digital filter multiple access (DFMA) passive optical networks (PONs) with concurrent inter-ONU communications have high tolerance to transmission system impairments and ONU channel interferences
Using the identified optimum digital filter length of 32 for both the upstream and inter-ONU communications, the power penalties caused by fiber transmissions and ONU channel interference are
The trade-off between ONU launch power dynamic range and aggregated signal transmission capacity has been investigated, which showsing that every ~1dB increase in ONU launch power dynamic range results in a ~5Gbit/s reduction in aggregated transmission capacity
Summary
As a key network segment connecting centralized baseband units (BBUs) and remote radio heads (RRHs) in radio. By adaptive orthogonal digital filter allocations under the centralized software-defined networking (SDN) controller, each ONU can generate its upstream SSB signals and inter-ONU SSB signals at the desired RF frequency regions without causing contention with other ONUs. In addition, an up-sampling factor of M leads to M/2 orthogonal shaping filter pairs, arbitrary channel counts are achievable by utilizing different up-sampling factors. HYBRID SSB OFDM-DFMA PONS The experimental setup is constructed using off-the-shelf optical/electrical devices and the impacts of practical fiber transmission impairments, digital filter characteristic variations as well as the ONU channel interference effect on the bit error ratio (BER) performances are thoroughly explored experimentally. The Rayleigh and Brillouin backscattering effects are measured, based on which the capability of the DSP-enabled adaptive RF spectral assignments, for reducing both the channel fading effects and
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