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Advances in Optics and Photonics

Advances in Optics and Photonics

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  • Editor: Govind Agrawal
  • Vol. 6, Iss. 2 — Jun. 30, 2014

Real photonic waveguides: guiding light through imperfections

Daniele Melati, Andrea Melloni, and Francesco Morichetti  »View Author Affiliations


Advances in Optics and Photonics, Vol. 6, Issue 2, pp. 156-224 (2014)
http://dx.doi.org/10.1364/AOP.6.000156


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Abstract

Real photonic waveguides are affected by structural imperfections due to fabrication tolerances that cause scattering phenomena when the light propagates through. These effects result in extrinsic propagation losses associated with the excitation of radiation and backscattering modes. In this work, we present a comprehensive review on the extrinsic loss mechanisms occurring in optical waveguides, identifying the main origins of scattering loss and pointing out the relationships between the loss and the geometrical and physical parameters of the waveguides. Theoretical models and experimental results, supported by statistical analysis, are presented for two widespread classes of waveguides: waveguides based on total internal reflection (TIR) affected by surface roughness, and disordered photonic crystal slab waveguides (PhCWs). In both structures extrinsic losses are strongly related to the waveguide group index, but the mode shape and its interaction with waveguide imperfections must also be considered to accurately model the scattering loss process. It is shown that as long as the group index of PhCWs is relatively low (ng<30), many analogies exist in the radiation and backscattering loss mechanisms with TIR waveguides; conversely, in the high ng regime, multiple scattering and localization effects arise in PhCWs that dramatically modify the waveguide behavior. The presented results enable the development of reliable circuit models of photonic waveguides, which can be used for a realistic performance evaluation of optical circuits.

© 2014 Optical Society of America

OCIS Codes
(130.2790) Integrated optics : Guided waves
(290.0290) Scattering : Scattering
(290.1350) Scattering : Backscattering
(290.4210) Scattering : Multiple scattering
(130.5296) Integrated optics : Photonic crystal waveguides

ToC Category:
Integrated Optics

History
Original Manuscript: November 14, 2013
Revised Manuscript: February 19, 2014
Manuscript Accepted: February 24, 2014
Published: May 9, 2014

Virtual Issues
(2014) Advances in Optics and Photonics

Citation
Daniele Melati, Andrea Melloni, and Francesco Morichetti, "Real photonic waveguides: guiding light through imperfections," Adv. Opt. Photon. 6, 156-224 (2014)
http://www.opticsinfobase.org/aop/abstract.cfm?URI=aop-6-2-156

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