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Related Experiment Video

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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference

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Published on: September 5, 2019

WDM-enabled multi-core parallel programmable photonic signal processor.

Zihang Yang^1,2, Yunlong Li^1,2, Shuang Zheng^3,4

¹Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, China.

Nature Communications

|July 15, 2026

Summary

We developed a wavelength-division multiplexing (WDM)-enabled photonic processor using a hexagonal mesh. This integrated photonics approach unlocks parallel processing by utilizing both spatial and wavelength domains simultaneously.

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Area of Science:

Integrated photonics
Photonic signal processing
Reconfigurable optical networks

Background:

Conventional Mach-Zehnder interferometer (MZI)-based programmable processors utilize wavelength-agnostic routing.
This limits processors to single-functionality operation, wasting the wavelength domain and hindering parallel processing.

Purpose of the Study:

To demonstrate a wavelength-division multiplexing (WDM)-enabled multi-core parallel programmable photonic processor.
To leverage both spatial and wavelength domains for enhanced functional density and multi-threaded execution.

Main Methods:

Designed a reconfigurable hexagonal mesh architecture.
Integrated Mach-Zehnder interferometers (MZIs) with over-coupled microring resonators as wavelength-selective phase shifters.
Exploited sharp phase transitions for precise wavelength control with 1 THz free spectral range and 4.3 mW/π tuning power.

Main Results:

Achieved simultaneous hosting of distinct network configurations on a single mesh.
Demonstrated multi-threaded execution through flex-grid WDM, parallel optical computation, and microwave photonic dual-beamforming.
Showcased enhanced functional density by integrating spatial and wavelength degrees of freedom.

Conclusions:

WDM-enabled processing offers a promising pathway for large-scale, highly parallel integrated photonic systems.
The developed architecture overcomes limitations of conventional MZI-based designs.
This approach significantly advances reconfigurable photonic processor capabilities.