VTT's micron-scale silicon rib+strip waveguide platform

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

1 Citation (Scopus)

Abstract

Silicon rib waveguides enable single-mode (SM) operation even with the combination of multi-micron core dimensions and high refractive index contrast. In such large waveguides the optical mode field is almost completely confined inside the Si core, which leads to small propagation losses and small polarization dependency. The unique SM condition of the rib waveguide also enables the use of an ultra-wide wavelength range, for example from 1.2 to <1.7 μm, without sacrificing either SM operation or low propagation loss. This makes micron-scale Si waveguides particularly well-suited for spectroscopy and extensive wavelength division multiplexing. However, rib waveguides require large bending radii, which lead to large circuit sizes. There are two solutions for this. So-called Euler bends in Si strip waveguides enable low-loss bends down to 1 μm bending radius with less than 0.1 dB/90° loss for both polarizations. Another alternative is a total-internal reflection mirror that can have loss as low as 0.1 dB for both polarizations in either strip or rib waveguides. The excitation of higher order modes in large strip waveguides is avoided by using adiabatic rib-strip converters and low-loss components. With rib and strip waveguides it is possible to reach a unique combination of low loss, extremely small footprint, small polarization dependency, ultra-wide bandwidth and tolerance to high optical powers.

Original languageEnglish
Title of host publicationSilicon Photonics and Photonic Integrated Circuits V
PublisherInternational Society for Optics and Photonics SPIE
ISBN (Electronic)9781510601369
DOIs
Publication statusPublished - 1 Jan 2016
MoE publication typeA4 Article in a conference publication
EventSilicon Photonics and Photonic Integrated Circuits V - Brussels, Belgium
Duration: 3 Apr 20167 Apr 2016

Publication series

SeriesProceedings of SPIE
Volume9891
ISSN0277-786X

Conference

ConferenceSilicon Photonics and Photonic Integrated Circuits V
CountryBelgium
CityBrussels
Period3/04/167/04/16

Fingerprint

Silicon
Strip
Waveguide
strip
Waveguides
platforms
waveguides
silicon
Polarization
Single Mode
polarization
Radius
Wavelength
Propagation
Total Internal Reflection
radii
propagation
footprints
wavelength division multiplexing
Multiplexing

Keywords

  • Multi-project wafer (MPW) runs
  • Rib waveguides
  • Silicon photonics
  • Silicon-on-insulator

Cite this

Aalto, T., Harjanne, M., & Cherchi, M. (2016). VTT's micron-scale silicon rib+strip waveguide platform. In Silicon Photonics and Photonic Integrated Circuits V [98911G] International Society for Optics and Photonics SPIE. Proceedings of SPIE, Vol.. 9891 https://doi.org/10.1117/12.2234588
Aalto, Timo ; Harjanne, Mikko ; Cherchi, Matteo. / VTT's micron-scale silicon rib+strip waveguide platform. Silicon Photonics and Photonic Integrated Circuits V. International Society for Optics and Photonics SPIE, 2016. (Proceedings of SPIE, Vol. 9891).
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abstract = "Silicon rib waveguides enable single-mode (SM) operation even with the combination of multi-micron core dimensions and high refractive index contrast. In such large waveguides the optical mode field is almost completely confined inside the Si core, which leads to small propagation losses and small polarization dependency. The unique SM condition of the rib waveguide also enables the use of an ultra-wide wavelength range, for example from 1.2 to <1.7 μm, without sacrificing either SM operation or low propagation loss. This makes micron-scale Si waveguides particularly well-suited for spectroscopy and extensive wavelength division multiplexing. However, rib waveguides require large bending radii, which lead to large circuit sizes. There are two solutions for this. So-called Euler bends in Si strip waveguides enable low-loss bends down to 1 μm bending radius with less than 0.1 dB/90° loss for both polarizations. Another alternative is a total-internal reflection mirror that can have loss as low as 0.1 dB for both polarizations in either strip or rib waveguides. The excitation of higher order modes in large strip waveguides is avoided by using adiabatic rib-strip converters and low-loss components. With rib and strip waveguides it is possible to reach a unique combination of low loss, extremely small footprint, small polarization dependency, ultra-wide bandwidth and tolerance to high optical powers.",
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Aalto, T, Harjanne, M & Cherchi, M 2016, VTT's micron-scale silicon rib+strip waveguide platform. in Silicon Photonics and Photonic Integrated Circuits V., 98911G, International Society for Optics and Photonics SPIE, Proceedings of SPIE, vol. 9891, Silicon Photonics and Photonic Integrated Circuits V, Brussels, Belgium, 3/04/16. https://doi.org/10.1117/12.2234588

VTT's micron-scale silicon rib+strip waveguide platform. / Aalto, Timo; Harjanne, Mikko; Cherchi, Matteo.

Silicon Photonics and Photonic Integrated Circuits V. International Society for Optics and Photonics SPIE, 2016. 98911G (Proceedings of SPIE, Vol. 9891).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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Aalto T, Harjanne M, Cherchi M. VTT's micron-scale silicon rib+strip waveguide platform. In Silicon Photonics and Photonic Integrated Circuits V. International Society for Optics and Photonics SPIE. 2016. 98911G. (Proceedings of SPIE, Vol. 9891). https://doi.org/10.1117/12.2234588