TY - JOUR

T1 - A Clock-gating-based Energy-efficient Scheme for ONUs in Real-time IMDD OFDM-PONs

AU - Zhang, Junjie

AU - Zhao, Jiahe

AU - Huang, Hanzi

AU - Ye, Nan

AU - Giddings, Roger

AU - Li, Zhengxuan

AU - Qin, Deli

AU - Zhang, Qianwu

AU - Tang, Jianming

PY - 2020/7/15

Y1 - 2020/7/15

N2 - A clock-gating-based energy-efficient scheme is proposed, for the first time, for applications in optical network units (ONUs) accommodated by orthogonal frequency division multiplexing passive optical networks (OFDM-PONs) based on intensity modulation and direct detection (IMDD). In the operation of a conventional downlink OFDM-PON, each ONU has to perform the demodulation in physical layer for all the received OFDM frames, regardless the received frames belong to the ONU or not. To improve the ONU’s energy consumption efficiency, in this paper, frame identification and clock control modules are introduced into each ONU, where the former is to distinguish whether a received frame belongs to the ONU or not, and the latter is to control the operating clock of the OFDM demodulation module according to the frame identification output. As a result, when a non-local frame arrives, the operating clock is set to a low value by the clock control module to deactivate the OFDM demodulation module in order to avoid unnecessary power consumption of the module. Experiments are undertaken in a realtime IMDD OFDM-PON platform, and measured results show that 51% energy consumption of a field programmable gate array (FPGA) chip embedded in the ONU can be saved compared with its conventional counterpart for downlink unicast scenarios

AB - A clock-gating-based energy-efficient scheme is proposed, for the first time, for applications in optical network units (ONUs) accommodated by orthogonal frequency division multiplexing passive optical networks (OFDM-PONs) based on intensity modulation and direct detection (IMDD). In the operation of a conventional downlink OFDM-PON, each ONU has to perform the demodulation in physical layer for all the received OFDM frames, regardless the received frames belong to the ONU or not. To improve the ONU’s energy consumption efficiency, in this paper, frame identification and clock control modules are introduced into each ONU, where the former is to distinguish whether a received frame belongs to the ONU or not, and the latter is to control the operating clock of the OFDM demodulation module according to the frame identification output. As a result, when a non-local frame arrives, the operating clock is set to a low value by the clock control module to deactivate the OFDM demodulation module in order to avoid unnecessary power consumption of the module. Experiments are undertaken in a realtime IMDD OFDM-PON platform, and measured results show that 51% energy consumption of a field programmable gate array (FPGA) chip embedded in the ONU can be saved compared with its conventional counterpart for downlink unicast scenarios

KW - Clock-gating

KW - Clocks

KW - Demodulation

KW - Field programmable gate arrays

KW - OFDM

KW - OFDM-PON

KW - Optical network units

KW - Passive optical networks

KW - Real-time systems

KW - energy-efficient

KW - frame identification

KW - real-time

U2 - 10.1109/JLT.2020.2977053

DO - 10.1109/JLT.2020.2977053

M3 - Article

VL - 38

SP - 3573

EP - 3583

JO - Journal of Lightwave Technology

JF - Journal of Lightwave Technology

SN - 0733-8724

IS - 14

ER -