High-speed reconfigurable free-space optical interconnects with carrierless-amplitude-phase modulation and...

Area of Science:

• Optical engineering
• Data communication
• High-performance computing

Background:

• Optical interconnects are crucial for high-performance computing and data centers.
• Free-space optical interconnects offer flexible card-to-card communication.
• Existing solutions face limitations in speed and range.

Purpose of the Study:

• To propose a reconfigurable free-space optical interconnect system.
• To enhance interconnect speed and range simultaneously.
• To address challenges in highly correlated optical channels.

Main Methods:

• Implementation of 16-carrierless-amplitude-phase (16-CAP) symbol modulation for increased symbol domain speed.
• Application of filter-enhanced spatial modulation (FE-SM) for enhanced spatial domain speed.
• Experimental demonstration of a 50 Gb/s reconfigurable optical interconnect.

Main Results:

• The 16-CAP and FE-SM scheme significantly increases interconnect speed.
• FE-SM shows negligible impact on bit error rate (BER) while improving speed.
• BER is improved by over one order of magnitude compared to conventional spatial modulation.
• Over 70% range extension and 50% speed increase achieved simultaneously.

Conclusions:

• The proposed 16-CAP and FE-SM scheme offers a promising solution for free-space optical interconnects.
• This technology enhances both speed and range, crucial for modern data transmission.
• The system demonstrates superior performance in terms of speed, range, and error rate.