World's fastest optical communications for data centers

Speedy transmission at a significantly low cost for data centres enables end users to widely use new forms of communications such as immersive videos, AR and VR. On a societal level, the increased transmission speed will open up a new era for Big Data and IoT applications, driving innovation and technology advancement.

With this breakthrough, around 10,000 persons can stream 4K video at the same time, compared to only 400 persons under the current available speed. The research is jointly undertaken by Prof. Alex Wai, PolyU Vice President (Research Development) and Chair Professor of Optical Communications, Prof. Chao Lu, Professor, Department of Electronic and Information Engineering (EIE), Dr. Alan Lau, Associate Professor, Department of Electrical Engineering (EE), and Dr. Kangping Zhong, Post-doctoral fellow, Department of Electronic and Information Engineering and in collaboration with Huawei Technologies Co. Ltd., a leading global ICT solution provider.

In optical communications, all types of information such as text, sound, music, image, and video are digitised and transmitted as light signals over optical fibre. As light interacts, through reflection and refraction, with the molecules of the fibre during transmission, light signal changes when it arrives at the receiver, making it a distorted signal.

The higher the transmission speed and the longer the distance, the more severe is the distortion, rendering the light signal unrecognisable at the receiver. This leads to failed transmission and limits the maximum transmission speed. By overcoming the challenge of distortion, speed can be increased.

The existing approach to undo distortion is the use of specialised hardware. Using high-cost components, such as specialised optical fibre, is a possible way to reduce distortion. However, its high cost and bulky size rendered such solution impractical for data centre business. Instead of using costly components, PolyU's research team develops a software approach to undo the distortions.

According to theories in Optics, interactions between light and a single molecule of fibre is well-known. However, in an optical fibre consisting of billions of molecules randomly placed and oriented with each other, the overall effect of interactions between light signal and the fibre become unknown, and therefore the signal distortion is also random. Nevertheless, there is "an order in chaos".

Through performing big data statistical analysis of massive amounts of transmitted and received light signals, we can identify the distortion pattern, and a considerable reversion of distortion can be made. In doing so, a significant increase in transmission speed can be achieved with inexpensive and mature components.

In conclusion, by combining Optics and Statistics, the algorithm software developed by PolyU enables simpler, cheaper, and commercially favorable solutions with world-record breaking speeds for next generation data centre applications.