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Updated: Sep 11, 2025
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Characterization of Anisotropic Leaky Mode Modulators for Holovideo
Published on: March 19, 2016
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Physical mode analysis of multimode cascaded nonlinear processes in strongly-coupled waveguides
Optics Express
|August 13, 2025
Summary
We demonstrate on-chip control of nonlinear optics in silicon nitride waveguides. This enables new ways to generate and analyze light across multiple supermodes for advanced frequency conversion.
Area of Science:
- Photonics
- Nonlinear Optics
- Integrated Optics
Background:
- Silicon nitride waveguide circuits are key for integrated photonics.
- Controlling nonlinear interactions in multimode systems is challenging.
Purpose of the Study:
- To experimentally investigate on-chip control and analysis of spatially multimode nonlinear interactions.
- To enable controlled excitation of nonlinear processes in multiple supermodes.
- To identify parallel and cascaded nonlinear processes using mode decomposition.
Main Methods:
- Utilizing dual-core silicon nitride waveguides with differing supermode dispersion.
- Employing integrated single-mode input/output waveguides for controlled excitation.
- Pumping with ultrashort pulses at 1.5-μm wavelength.
Main Results:
- Observed simultaneous dual-supermode supercontinuum generation with varying spectral widths.
- Demonstrated third-harmonic generation at 515 nm.
- Showcased cascaded four-wave mixing upconverting third-harmonic radiation to blue wavelengths (450-485 nm).
Conclusions:
- On-chip spatial multiplexing/demultiplexing enables broadband nonlinear conversion analysis.
- This approach advances understanding and control in multimode nonlinear optics.
- Potential for extending frequency conversion to wider spectral ranges.
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