Project

Co-packaged multi-channel burst-mode optical transceiver for inter-GPU connections.

Code
1SHI024N
Duration
01 November 2023 → 31 October 2027
Funding
Research Foundation - Flanders (FWO)
Research disciplines
  • Engineering and technology
    • Optical networks and systems
    • Analogue, RF and mixed signal integrated circuits
    • Electronic circuit and system reliability
    • Semiconductor devices, nanoelectronics and technology
Keywords
Electro-optical transceiver IC design Thermal control circuits Wavelength Division Multiplexing
 
Project description

Due to the deployment of 5G and IoT applications combined with the advance of AI, AR and VR, there is a big increase in high performance computing. Such computing is done in datacenters and/or by GPU workstations. To keep improving power consumption and computing capabilities, fast and power efficient interconnects are a necessity. Co-packaged optics enable this by bringing optics closer to the computing core. In this proposal, we aim to develop a co-packaged burst-mode optical transceiver with a focus on an area and power efficient design. To enable a high bandwidth link, wavelength division multiplexing will be incorporated. As microring modulators and ring drop filters are inherently wavelength selective, they are ideally suited for WDM. The issue however is their sensitivity to temperature and process variation, meaning a control circuit is necessary. Such control circuits usually use additional drop ports on the fiber, leading to additional optical loss. This optical loss then scales with the amount of wavelength channels, as each additional wavelength channel needs a separate control loop. Alternative methods utilizing the inherent photocurrent generated by the ring exist, however not for burst-mode transceivers, which poses additional challenges. The goal in this project is to develop a complete transceiver, consisting of driver, modulator, wavelength filter, photodiode and transimpedance amplifier, with included control circuits for modulator and filter rings.