Elenion Technologies, LLC

Tal Galfsky

Yang Liu

Ruizhi Shi

Thomas Wetteland Baehr-Jones

Matthew Streshinsky

Saeed Fathololoumi

Yury Dziashko

When routing light on photonic integrated circuit (PIC) chips optical back-reflection and scattering can be highly detrimental to the desired application. Unused ports of optical devices, such as MMI, DC, Y-junction, PD, etc. are a cause for back-reflection and scattering, whereby the scattered light could get picked up by adjacent components, e.g. photodetectors. Management of stray light on the PIC is needed to prevent the undesired coupling between various components and to reduce noise. A dump taper may be used to guide and scatter stray light away from sensitive components or fully absorb the light while maintaining very low reflection from the taper. A doped dump taper may be used to passively absorb light reaching the unused port, thereby eliminating unwanted reflection and scattering. Alternatively, an undoped taper may be used to scatter light away from sensitive components while maintaining very low back-reflection.

Dump terminator

An on-chip optical filter including three different arm sections comprised of three different types of waveguides, e.g. shape, material or polarization, can achieve the same performance quality as external commercially available solutions with no addition costs of fabrication of the photonic integrated chip (PIC) and a footprint several orders of magnitude smaller than any of the conventional filters.

Thermally stable optical filter

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Morristown, NJ, United States of America

Tal Galfsky