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Researchers at École polytechnique fédérale de Lausanne’s (EPFL’s) School of Basic Sciences have developed a technology that produces silicon nitride integrated photonic circuits with low optical losses and small footprints.
Silicon is favored as a material for integrated photonic chips due to its abundance and optical properties, though the material has an optical loss orders of magnitude higher than that of silicon nitride. As a result, silicon nitride has been a material of choice for applications where low loss is critical, such as narrow-linewidth lasers, photonic delay lines, and those in nonlinear photonics.
Integrated silicon nitride photonic chips with meter-long spiral waveguides….