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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 6 — Mar. 25, 2013
  • pp: 7304–7315

Broadband directional coupling in aluminum nitride nanophotonic circuits

Matthias Stegmaier and Wolfram H. P. Pernice  »View Author Affiliations

Optics Express, Vol. 21, Issue 6, pp. 7304-7315 (2013)

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Aluminum nitride (AlN)-on-insulator has emerged as a promising platform for the realization of linear and non-linear integrated photonic circuits. In order to efficiently route optical signals on-chip, precise control over the interaction and polarization of evanescently coupled waveguide modes is required. Here we employ nanophotonic AlN waveguides to realize directional couplers with a broad coupling bandwidth and low insertion loss. We achieve uniform splitting of incoming modes, confirmed by high extinction-ratio exceeding 33dB in integrated Mach-Zehnder Interferometers. Optimized three-waveguide couplers furthermore allow for extending the coupling bandwidth over traditional side-coupled devices by almost an order of magnitude, with variable splitting ratio. Our work illustrates the potential of AlN circuits for coupled waveguide optics, DWDM applications and integrated polarization diversity schemes.

© 2013 OSA

OCIS Codes
(130.3120) Integrated optics : Integrated optics devices
(160.1050) Materials : Acousto-optical materials
(160.6000) Materials : Semiconductor materials
(230.5750) Optical devices : Resonators

ToC Category:
Integrated Optics

Original Manuscript: January 14, 2013
Revised Manuscript: March 7, 2013
Manuscript Accepted: March 7, 2013
Published: March 15, 2013

Matthias Stegmaier and Wolfram H. P. Pernice, "Broadband directional coupling in aluminum nitride nanophotonic circuits," Opt. Express 21, 7304-7315 (2013)

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