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Area of Science:

  • Photonics and Optical Communications
  • Integrated Optics
  • Metamaterials

Background:

  • On-chip mode-division multiplexing (MDM) is crucial for increasing data capacity in optical communication systems.
  • Existing MDM circuits suffer from large footprints and inter-mode crosstalk, limiting practical applications.
  • High-speed MDM signal transmission in arbitrarily routed circuits remains a significant challenge.

Purpose of the Study:

  • To demonstrate compact on-chip MDM circuits using digitized meta-structures.
  • To enable high-speed, arbitrarily routed MDM signal transmission.
  • To overcome the limitations of footprint and crosstalk in current MDM technologies.

Main Methods:

  • Development of MDM circuits based on novel digitized meta-structures.
  • Integration of sharp bends and compact crossings within the meta-structure design.
  • Testing of 112 Gbit/s signal transmission per mode through the fabricated circuits.

Main Results:

  • Achieved extremely compact footprints for on-chip MDM circuits.
  • Demonstrated 112 Gbit/s signal transmission for each mode with a bit error rate below the forward error correction limit.
  • Successfully routed signals through circuits with sharp bends and compact crossings.

Conclusions:

  • Digitized meta-structures offer a viable solution for compact and efficient on-chip MDM.
  • This technology significantly improves integration density for multimode optical systems.
  • Enables high-speed, flexible routing for future optical interconnects.