An energy-saving scheme of TWDM-PON system for NG-EPON networks

Time and wavelength-division multiplexed passive optical network (TWDM-PON) is a primary solution for the next-generation passive optical network. Previous works in TWDM-PON mainly adopt dual energy-saving modes in ONUs for serving downstream traffic. Such approach may lead to significant energy waste. This paper proposes a cycle-based tri-mode energy-saving mechanism by jointly considering both packet arrival time and tuning time, to achieve enhanced energy saving and delay performance. Simulation results show that proposed scheme saves the energy on both ONU and OSU while providing satisfactory QoS performance.