Intermodal frequency generation in silicon-rich silicon nitride waveguides

Abstract

Dispersion engineering in optical waveguides allows applications relying on the precise control of phase matching conditions to be implemented. Although extremely effective over relatively narrow band spectral regions, dispersion control becomes increasingly challenging as the bandwidth of the process of interest increases. Phase matching can also be achieved by exploiting the propagation characteristics of waves exciting different spatial modes of the same waveguide. Phase matching control in this case relies on achieving very similar propagation characteristics across two, and even more, waveguide modes over the wavelengths of interest, which may be rather far from one another. We demonstrate here that broadband (>40  nm) four-wave mixing can be achieved between pump waves and a signal located in different bands of the communications spectrum (separated by 50 nm) by exploiting interband nonlinearities. Our demonstration is carried out in the silicon-rich silicon nitride material platform, which allows flexible device engineering, allowing for strong effective nonlinearity at telecommunications wavelengths without deleterious nonlinear-loss effects.

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Identifiers

ORCID for Cosimo Lacava: orcid.org/0000-0002-9950-8642

ORCID for Thalia Domínguez Bucio: orcid.org/0000-0002-3664-1403

ORCID for Peter Horak: orcid.org/0000-0002-8710-8764

ORCID for Yongmin Jung: orcid.org/0000-0002-9054-4372

ORCID for Frederic Gardes: orcid.org/0000-0003-1400-3272

ORCID for David Richardson: orcid.org/0000-0002-7751-1058

ORCID for Periklis Petropoulos: orcid.org/0000-0002-1576-8034

ORCID for Francesca Parmigiani: orcid.org/0000-0001-7784-2829

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