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Optics Letters

Optics Letters


  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 2 — Jan. 15, 2014
  • pp: 335–338

Ultra-low-loss CMOS-compatible waveguide crossing arrays based on multimode Bloch waves and imaginary coupling

Yangyang Liu, Jeffrey M. Shainline, Xiaoge Zeng, and Miloš A. Popović  »View Author Affiliations

Optics Letters, Vol. 39, Issue 2, pp. 335-338 (2014)

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We experimentally demonstrate broadband waveguide crossing arrays showing ultralow loss of 0.04dB/crossing (0.9%) on average and converging to 0.033dB/crossing (0.075%) matching theory and cross-talk suppression over 35 dB in a CMOS-compatible geometry. The principle of operation is the tailored excitation of a low-loss spatial Bloch wave formed by matching the periodicity of the crossing array to the difference in propagation constants of the first- and third-order TE-like modes of a multimode silicon waveguide. Radiative scattering at the crossing points acts like a periodic imaginary-permittivity perturbation that couples two supermodes, which results in imaginary (radiative) propagation-constant splitting and gives rise to a low-loss, unidirectional breathing Bloch wave. This type of crossing array provides a robust implementation of a key component enabling dense photonic integration.

© 2014 Optical Society of America

OCIS Codes
(130.3120) Integrated optics : Integrated optics devices
(230.7370) Optical devices : Waveguides

ToC Category:
Integrated Optics

Original Manuscript: November 14, 2013
Revised Manuscript: December 5, 2013
Manuscript Accepted: December 5, 2013
Published: January 10, 2014

Yangyang Liu, Jeffrey M. Shainline, Xiaoge Zeng, and Miloš A. Popović, "Ultra-low-loss CMOS-compatible waveguide crossing arrays based on multimode Bloch waves and imaginary coupling," Opt. Lett. 39, 335-338 (2014)

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