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Polarization-dependent phase-modulation metasurface for vortex beam (de)multiplexing
Haisheng Wu1, Qingji Zeng1, Xinrou Wang1
1International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology, Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen 518060, China.
Nanophotonics (Berlin, Germany)
|December 5, 2024
Summary
Researchers developed a novel metasurface device to simultaneously multiplex and demultiplex orbital angular momentum (OAM) and polarization channels in optical communications. This breakthrough enhances communication capacity by enabling efficient multidimensional signal processing.
Area of Science:
- Optics and Photonics
- Optical Communications
- Metamaterials
Background:
- Vortex beams (VBs) offer enhanced communication capacity via multiplexing dimensions like orbital angular momentum (OAM), polarization, and wavelength.
- Existing multidimensional multiplexing techniques lack compatible (de)multiplexers.
Purpose of the Study:
- To design and demonstrate a polarization-dependent metasurface capable of simultaneously (de)multiplexing OAM and polarization channels.
- To validate the performance of the developed device in a high-capacity optical communication system.
Main Methods:
- Utilized the Pancharatnam-Berry (PB) phase concept to create a polarization-dependent phase-modulation metasurface.
- Integrated two Dammann vortex gratings with orthogonal polarization responses for simultaneous OAM and polarization (de)multiplexing.
- Constructed a 16-channel communication system transmitting 400 Gbit/s quadrature-phase shift-keying (QPSK) signals.
Main Results:
- Successfully demonstrated simultaneous (de)multiplexing of OAM and polarization channels.
- Achieved bit-error-rates (BERs) below 1.67 × 10-6 at -15 dBm received power.
- Validated the system's effectiveness in a 16-channel, 400 Gbit/s QPSK transmission.
Conclusions:
- The designed metasurface effectively addresses the need for a compatible (de)multiplexer for multidimensional optical communication systems.
- The demonstrated system shows significant potential for future high-capacity optical communication networks.
- This work paves the way for advanced optical signal processing using metasurface-based devices.
