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Broadband multimode interference coupler based on SiN waveguide designed by the adjoint method.
Optics Letters
|August 15, 2025
Summary
This study introduces an inverse-designed silicon nitride (SiN) waveguide coupler. The novel method enables broadband 3-dB power splitting over a 100-nm range with excellent experimental validation.
Area of Science:
- Photonics and Waveguide Engineering
- Nanophotonics and Metamaterials
- Computational Electromagnetics
Background:
- Multimode interference (MMI) couplers are essential photonic components.
- Achieving broadband operation and precise power splitting in MMI couplers remains challenging.
- Inverse design offers a powerful approach for optimizing complex photonic structures.
Purpose of the Study:
- To propose and validate an inverse-designed broadband multimode interference (MMI) coupler using silicon nitride (SiN) waveguides.
- To demonstrate a fabrication-friendly design methodology based on adjoint sensitivity analysis and binarization.
- To experimentally verify the device's performance for broadband 3-dB splitting.
Main Methods:
- Utilizing inverse design with adjoint sensitivity analysis to optimize waveguide geometry.
- Modulating waveguide widths within the MMI region and optimizing input/output ports.
- Binarizing the refractive index distribution for simplified fabrication.
- Fabricating the designed SiN waveguide coupler and measuring its transmission spectra.
Main Results:
- Achieved a very flat spectral response over a 100-nm wavelength range by modulating MMI region widths.
- Experimental transmission spectra showed excellent agreement with simulation results.
- Successfully demonstrated over 100-nm broadband 3-dB splitting experimentally.
Conclusions:
- The proposed inverse design method is effective for creating broadband MMI couplers.
- Binarization of the refractive index distribution enables practical fabrication.
- The developed SiN MMI coupler shows significant potential for integrated photonic applications requiring broadband performance.

