Abstract
Reflective electro-absorption modulation-intensity modulators (REAM-IMs) are utilized, for the first time, to experimentally demonstrate colorless ONUs in single-fiber-based, bidirectional, intensity-modulation and direct-detection (IMDD), optical OFDM PONs (OOFDM-PONs) incorporating 25 km SSMFs and OLT-side-seeded CW optical signals. The colorlessness of the REAM-IMs is characterized, based on which optimum REAM-IM operating conditions are identified. In the aforementioned PON architecture, 10Gb/s colorless upstream transmissions of end-to-end real-time OOFDM signals are successfully achieved for various wavelengths within the entire C-band. Over such a wavelength window, corresponding minimum received optical powers at the FEC limit vary in a range as small as <0.5 dB. In addition, experimental measurements also indicate that Rayleigh backscattering imposes a 2.8 dB optical power penalty on the 10 Gb/s over 25 km upstream OOFDM signal transmission. Furthermore, making use of on-line adaptive bit and power loading, a linear trade-off between aggregated signal line rate and optical power budget is observed, which shows that, for the present PON system, a 10% reduction in signal line rate can improve the optical power budget by 2.6 dB.
Highlights
Passive optical networks (PONs) are foreseen as the main technology in worldwide fiber-tothe-home (FTTH) deployments
Based on the adaptive bit and power loading function implemented in the real-time orthogonal frequency division multiplexing (OOFDM) transceivers, the dependence of the aggregated upstream signal transmission capacity on the minimum received optical power (ROP) at the FEC limit is experimentally explored in the bidirectional PON architecture of interest of the present paper
Extensive experimental explorations of the PON performance have been undertaken in terms of reflective electro-absorption modulators (REAMs)-IM colorlessness, maximum achievable upstream transmission capacity, key physical factors limiting the upstream OOFDM transmission performance and trade-off between aggregated signal transmission capacity and ROP
Summary
Passive optical networks (PONs) are foreseen as the main technology in worldwide fiber-tothe-home (FTTH) deployments. To further enhance signal transmission capacities of reflective WDM-PONs while still preserving their compatibility with existing time-division-multiplexing PONs (TDM-PONs), optical orthogonal frequency division multiplexing (OOFDM) has been considered as one of the strongest physical layer technologies, since OOFDM has inherent and unique advantages such as potential of providing cost-effective technical solutions by fully exploiting the rapid advances in modern digital signal processing (DSP) technology, dynamic provision of hybrid bandwidth allocation in the frequency and time domains, reduction in optical network complexity owing to its great resistance to dispersion impairments and efficient utilization of channel spectral characteristics It is, preferable if use is made of OOFDM in reflective intensity modulator-based ONUs in WDM-PONs incorporating standard single mode fiber (SSMF) systems utilizing simple intensity modulation and direct detection (IMDD). Based on the adaptive bit and power loading function implemented in the real-time OOFDM transceivers, the dependence of the aggregated upstream signal transmission capacity on the minimum received optical power (ROP) at the FEC limit is experimentally explored in the bidirectional PON architecture of interest of the present paper
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