Coherent optical interconnects using Fermat number transform and hollow core fibre

Area of Science:

• Optical communications
• Data center networking
• Signal processing

Background:

• Exponential growth in AI-driven data center traffic necessitates high-speed, low-latency, and power-efficient optical interconnects.
• Existing solutions face challenges in meeting these demands due to complex digital signal processing and latency.

Purpose of the Study:

• To present an ultra-simple, low-latency self-homodyne coherent interconnect solution.
• To leverage anti-resonant hollow core fiber and Fermat number transform for enhanced performance.

Main Methods:

• Utilized anti-resonant hollow core fiber for data transmission.
• Implemented digital signal processing using the Fermat number transform, replacing Fast Fourier Transform.
• Demonstrated bidirectional transmission over a 5.1-km fiber link.

Main Results:

• Achieved a data rate of 448 Gb·s⁻¹.
• Reduced digital signal processing complexity by 90%.
• Decreased propagation latency by 28.4% through fiber integration.

Conclusions:

• The proposed scheme offers a promising path for pushing the energy-efficiency boundary of coherent optical interconnects.
• Enables large-scale deployment of efficient and low-latency coherent optical interconnects for AI data centers.