Pulse amplitude modulation applied to extended Passive Optical Pod Interconnect, for small energy-aware data centers
Résumé
We analyze the recently proposed Extended-Passive-Optical-Pod Interconnect (e-POPI), designed for small energy-aware data centers, including server-turn-on/off strategies. We investigate several options to increase up to 56 Gbit/s the bit rate of e-POPI's links by the use of Pulse Amplitude Modulation (4 or 8 PAM) considering three types of receivers (including SOA-PIN). The maximum number of connected entities (servers or racks), limited by the insertion losses and the technology of fast-tunable-POPI emitters, reaches 253/159, using 8 PAM and SOA-PIN in conjunction with a 25/37.5-GHz grid for 28/56-Gbit/s links.