Tunable topological wavelength division multiplexer based on lateral heterostructured edge states

Area of Science:

• Integrated optics
• Photonics
• Topological photonics

Background:

• Existing topological wavelength division multiplexing (TWDM) systems face limitations in bandwidth, channel count, and applicable frequency bands.
• High-performance topological photonic devices are crucial for the advancement of integrated optics.

Purpose of the Study:

• To propose a novel harpoon-type TWDM system for high-capacity energy transmission.
• To enhance the tunability and topological protection of TWDM systems.

Main Methods:

• Introduction of a tunable-mode-width large-area waveguide.
• Utilization of a serpentine interleaved heterostructured waveguide for multi-channel separation.
• Development of a precise frequency tuning method compatible with existing operating principles.

Main Results:

• The proposed system operates within the C-band (178.73 THz–198.91 THz).
• Achieved a high transmittance contrast of 50–90 dB.
• Demonstrated large-scale defect resistance, indicating robust topological protection.

Conclusions:

• The developed TWDM system provides a comprehensive design for advanced optical communication.
• Offers flexible tunability and improved performance compared to existing TWDM systems.
• Paves the way for next-generation integrated photonic devices with enhanced capabilities.