Optical interconnection networks in data centers: recent trends and future challenges

TLDR

Warehouse‑scale data centers require much higher‑bandwidth intra‑DCN networks to handle growing traffic, but commodity switches consume excessive power, prompting the emergence of optical interconnects that promise higher throughput with lower energy use. The article reviews recent advances in ultra‑high‑capacity optical interconnects for intra‑DCN communication. The authors examine and compare several recently proposed optical DCN architectures and technologies. They outline future trends and research challenges.

Abstract

Warehouse-scale data center operators need much-higher-bandwidth intra-data center networks (DCNs) to sustain the increase of network traffic due to cloud computing and other emerging web applications. Current DCNs based on commodity switches require excessive amounts of power to face this traffic increase. Optical intra-DCN interconnection networks have recently emerged as a promising solution that can provide higher throughput while consuming less power. This article provides an update on recent developments in the field of ultra-highcapacity optical interconnects for intra-DCN communication. Several recently proposed architectures and technologies are examined and compared, while future trends and research challenges are outlined.