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Guided-mode based arbitrary signal switching through an inverse-designed ultra-compact mode switching device
Optics Express
|April 27, 2022
Summary
This study introduces a novel silicon photonic guided-mode switching architecture. It enables arbitrary signal routing with reduced design costs, paving the way for efficient mode-division multiplexing communication systems.
Area of Science:
- Photonics and optical engineering
- Integrated optics
- Device physics
Background:
- Inverse design and free-form optimization enable highly tunable and compact photonic devices.
- Guided-mode manipulation is crucial for advanced optical signal processing.
Purpose of the Study:
- To implement an inverse design platform for silicon photonic guided-mode manipulation.
- To demonstrate a passive, guided mode-based signal switching architecture.
- To reduce the design cost for large-scale switching systems.
Main Methods:
- Utilized inverse design and free-form geometrical optimization for device design.
- Developed a guided mode-based signal switching architecture.
- Employed a cascading method with a small set of basis switching devices.
Main Results:
- Demonstrated a passive signal switching mechanism requiring no power for state maintenance.
- Showcased that arbitrary routing states can be constructed by cascading basis devices.
- Achieved insertion losses below 2.8 dB for TE0-TE1, 3.1 dB for TE1-TE2, and 2.3 dB for TE0-TE2 mode switching units.
- Reduced the number of required switching devices from N! to N-1 for N-channel switching.
Conclusions:
- The demonstrated architecture offers arbitrary signal switching with an ultra-compact footprint.
- This approach is promising for applications in mode-division multiplexing (MDM) communication systems.
- The method significantly reduces design complexity and cost for scalable switching solutions.
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