Performance assessment of octagonal layout based integrated photonic reservoir computing for optical channel...

Area of Science:

• Integrated photonics
• Optical communication systems
• Reservoir computing

Background:

• Electronic equalizers face limitations in bandwidth, latency, and power consumption for high-speed optical communication.
• Existing rectangular reservoir computing layouts suffer from inadequate signal exchange and increased noise due to waveguide crossings.

Purpose of the Study:

• To propose and evaluate a novel octagonal reservoir layout for optical channel equalizers.
• To investigate the impact of layout shape and parameters on equalization performance in a 25Gbaud optical communication system.

Main Methods:

• System-level simulation of an octagonal reservoir layout for optical channel equalization.
• Comparative analysis against rectangular layouts and feedforward equalizers.
• Investigation of parameters including layout shape, node quantity, port number, and weight algorithm.

Main Results:

• The octagonal layout demonstrates lower bit error rates (BER) compared to rectangular layouts across transmission distances of 5-30 km.
• At 5 km, the octagonal layout achieved BERs 5 and 10 orders of magnitude lower than rectangular and feedforward equalizers, respectively.
• K-nearest neighbor regression as a readout algorithm yielded the best performance with a BER of 7.012 × 10^-14.

Conclusions:

• The octagonal reservoir layout is a highly effective design for optical channel equalization.
• Integrated photonic reservoir computing offers significant advantages for future high-speed optical communication networks.
• The proposed octagonal design overcomes limitations of previous layouts, enabling improved signal integrity and performance.