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Optical integrated reconfigurable mode generator-multiplexer for radio-frequency orbital angular momentum
Optics Express
|November 14, 2024
Summary
This study introduces a novel integrated photonic system for generating radio-frequency orbital angular momentum (RF-OAM) modes. The system enables fast switching and multiplexing of RF-OAM modes for 6G wireless communications.
Area of Science:
- Photonics and Wireless Communications
- Integrated Optics
- Antenna Array Technology
Background:
- Radio-frequency orbital angular momentum (RF-OAM) is crucial for next-generation wireless communication capacity.
- Circular antenna arrays (CAAs) offer a promising platform for RF-OAM generation.
- Existing RF-OAM generation methods often rely on bulk optics or limited bandwidth delay lines.
Purpose of the Study:
- To present a novel phased array-based integrated photonic RF-OAM generator-multiplexer.
- To demonstrate fast mode switching and mode multiplexing capabilities.
- To support a four-antenna CAA system operating at 16 GHz.
Main Methods:
- Utilized a specially designed interleaved optical filter.
- Employed a four-element phased array with cascaded phase shifters.
- Implemented wavelength tuning to control output RF-OAM modes.
Main Results:
- Successfully generated and switched between fundamental and ±1 RF-OAM modes.
- Achieved a demonstrated bandwidth of 1 GHz.
- Demonstrated mode multiplexing by loading all three wavelength pairs.
Conclusions:
- The proposed integrated photonic approach offers a flexible and efficient solution for RF-OAM generation.
- This technology is well-suited for advancing 6G wireless communication systems.
- The system provides fast mode switching and multiplexing capabilities for enhanced data capacity.
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