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Ultra-compact hybrid multimode division multiplexer based on a photonic crystal nanobeam
Optics Letters
|June 13, 2025
Summary
We developed a compact hybrid four-mode multiplexer using a photonic crystal nanobeam. This device enables efficient on-chip integration for multidimensional multiplexing systems.
Area of Science:
- Photonics
- Nanotechnology
- Integrated Optics
Background:
- On-chip optical systems require efficient integration of multiple functionalities.
- Multidimensional multiplexing is crucial for increasing data capacity.
- Existing mode converters often occupy significant chip space.
Purpose of the Study:
- To propose and fabricate an ultra-compact hybrid four-mode multiplexer.
- To enhance the integration of on-chip multidimensional multiplexing systems.
- To achieve synchronous mode conversion during reflection.
Main Methods:
- Utilizing a photonic crystal nanobeam for mode conversion.
- Incorporating subwavelength gratings and tapered waveguides.
- Fabricating the device with a minimum feature size of 130 nm.
Main Results:
- Achieved an ultra-compact coupling region length of 1.625 μm.
- Demonstrated insertion loss below 3.66 dB.
- Obtained crosstalk better than -13 dB over a 60 nm bandwidth.
Conclusions:
- The proposed device significantly reduces size for on-chip integration.
- Synchronous mode conversion simplifies system architecture.
- Low lithography requirements facilitate practical implementation.
