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Environmental and economic concerns promote research on designingenergy-efficient Time and Wavelength Division Multiplexed Ethernet PassiveOptical Network (TWDM-EPON), which is the future extension to TDM-EPON. InTDM-EPON, a plethora of research is already present to achieve energy savingsat Optical Network Units (ONUs) which can easily be applied for TWDM-EPON ONUs.However, TWDM-EPON provides an additional opportunity for saving energy at theOptical Line Terminal (OLT). All existing protocols have primarily beendesigned for saving energy at the OLT receivers. The protocols to save energyat the OLT receives depends only on the Up-Stream(US) traffic scheduling whileits transmitter counterpart depends on both US and Down-Stream (DS) schedulingsince the OLT transmits GATE message along with DS traffic. The US and DSscheduling have a basic difference. The MAC protocol doesn't allow schedulingof US traffic of an ONU after its REPORT arrival at multiple disjoint timeslots. However, this restriction is absent for DS traffic and hence, thegrant-size of an ONU can be partitioned and every part can be scheduled atdifferent times. In this paper, we propose a method for saving energy at theOLT transmitters in TWDM-EPON while satisfying the SLAs. This includes aheuristic algorithm to partition the DS grant and schedule them. Throughextensive simulations, we demonstrate that the proposed method provides asignificant improvement in energy efficiency as compared to existing protocols(up to 45%).

Protocol design for energy efficient OLT transmitter in TWDM-PON guaranteeing SLA of up-stream and down-stream traffic