The Key Technology Research Of Symmetric 100G-PON

Driven by the increasing user bandwidth demand such as high-quality video and audio,cloud service,high bandwidth 4G and 5G mobile front-haul applications,passive optical network(PON)systems with higher capacity are highly desired.The current standardized ITU-T next-generation passive optical network stage 2(NG-PON2)employs time-and wavelength-division multiplexed PON(TWDM-PON)architecture by stacking four wavelengths,each supporting 10-Gb/s downlink data rate over power-split optical distribution network(ODN),thereby supporting 40-Gb/s downstream capacity.IEEE next-generation Ethernet passive optical network(NG-EPON)has also been discussed in depth to provide a capacity of 100-Gb/s with 25-Gb/s per wavelength,which has attracted extensive attention from the industry.Meanwhile,ITU-T NG-PON2 standardization starts to consider upgrading the capacity from 10-Gb/s to 25-Gb/s per channel.Therefore,we deploy a deep research about the key technology of symmetric 100G-PON and detailedly discuss the implementation scheme of achieving the 100 Gb/s capacity for downstream and upstream.In this article,we have proposed the key technology of employing delay interferometer(DI)to achieve chirp management as well as frequency equalization for downstream and have demonstrated the first field trial of a real-time 100-Gb/s passive optical network(PON)with downstream/upstream data rates of 25/10-Gb/s/λ based on 10G-class optical devices supporting 0-40 km differential reach.Meanwhile,we further improve the system performance from the dimension of space using multi-core fiber to achieve a low-cost system architecture with 700G/280 G system capacity.For the upstream,we have proposed the key technology of partial dispersion compensation technique and employ optical dispersion compensation module in optical line terminal(OLT)to compensate the partial chromatic dispersion of 0-40 km differential reach of both 25-Gb/s EDB and PAM-4 signals.