Demonstration of PS-QAM Based Flexible Coherent PON in Burst-Mode With 300G Peak Rate and Ultra-Wide Dynamic Range

Coherent passive optical network (PON) has been proposed to support the next generation high-speed optical access network owing to the superior receiver sensitivity and thereby the extended power budget for 100 G-and-beyond. In addition, PON's flexibility and adaptability are gaining increasing interest. Flexible PON is believed to be a powerful solution in optimizing the overall capacity based on the available channel conditions, i.e., the optical path loss (OPL) and the associated signal-to-noise ratio and nonlinearity impairments of the different groups of optical network units. In this study, we demonstrate the rate-flexible coherent TDM-PON in burst-mode based on probabilistic-shaping (PS) QAM modulations and local oscillator (LO) power adjustment technology, achieving a 300G peak rate and ultra-wide dynamic range. The principle, the burst-mode frame generation as well as the burst-mode signal processing are discussed in detail. To indicate the overall performance of achievable capacity and flexibility, a new metric, namely,
dynamic-range and net-rate product
(
DRNRP
) is introduced as the indicator to show the optimized throughput. Finally, we experimentally demonstrated a flexible coherent TDM-PON in burst-mode based on 25-GBaud PS-QAMs with the dynamic range of >35-dB in back-to-back. A record
DRNRP
up to 7,104 dB·Gbps was achieved in the current system with net data rate varying from 255-Gbits/s to 85-Gbits/s as the OPL varies over 20-km fiber transmission.