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Theoretical and experimental investigations of efficient light coupling with spatially varied all dielectric striped waveguides

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dc.contributor.author Yilmaz, Y.A.
dc.contributor.author  Tandogan, S.E.
dc.contributor.author  Hayran, Z.
dc.contributor.author Giden, I.H.
dc.contributor.author  Turduev, M.
dc.contributor.author  Kurt, Hamza
dc.date.accessioned 2019-06-26T07:43:37Z
dc.date.available 2019-06-26T07:43:37Z
dc.date.issued 2017-07
dc.identifier.citation Yilmaz, Y. A., Tandogan, S. E., Hayran, Z., Giden, I. H., Turduev, M., & Kurt, H. (2017). Theoretical and experimental investigations of efficient light coupling with spatially varied all dielectric striped waveguides. Journal of Applied Physics, 122(3), 033101. en_US
dc.identifier.issn 218979
dc.identifier.uri https://aip.scitation.org/doi/10.1063/1.4994032
dc.identifier.uri http://hdl.handle.net/20.500.11851/1344
dc.description.abstract Integrated photonic systems require efficient, compact, and broadband solutions for strong light coupling into and out of optical waveguides. The present work investigates an efficient optical power transferring the problem between optical waveguides having different widths of in/out terminals. We propose a considerably practical and feasible concept to implement and design an optical coupler by introducing gradually index modulation to the coupler section. The index profile of the coupler section is modulated with a Gaussian function by the help of striped waveguides. The effective medium theory is used to replace the original spatially varying index profile with dielectric stripes of a finite length/width having a constant effective refractive index. 2D and 3D finite-difference time-domain analyzes are utilized to investigate the sampling effect of the designed optical coupler and to determine the parameters that play a crucial role in enhancing the optical power transfer performance. Comparing the coupling performance of conventional benchmark adiabatic and butt couplers with the designed striped waveguide coupler, the corresponding coupling efficiency increases from approximately 30% to 95% over a wide frequency interval. In addition, to realize the realistic optical coupler appropriate to integrated photonic applications, the proposed structure is numerically designed on a silicon-on-insulator wafer. The implemented SOI platform based optical coupler operates in the telecom wavelength regime (? = 1.55 ?m), and the dimensions of the striped coupler are kept as 9.77 ?m (along the transverse to propagation direction) and 7.69 ?m (along the propagation direction) where the unit distance is fixed to be 465 nm. Finally, to demonstrate the operating design principle, the microwave experiments are conducted and the spot size conversion ratio as high as 7.1:1 is measured, whereas a coupling efficiency over 60% in the frequency range of 5.0-16.0 GHz has been also demonstrated. © 2017 Author(s). en_US
dc.language.iso eng en_US
dc.publisher American Institute Of Physics Inc. en_US
dc.rights info:eu-repo/semantics/closedAccess
dc.subject Photonic crystals en_US
dc.subject photonics en_US
dc.subject graded photonic en_US
dc.title Theoretical and experimental investigations of efficient light coupling with spatially varied all dielectric striped waveguides en_US
dc.type article en_US
dc.relation.journal Journal Of Applied Physics en_US
dc.contributor.department TOBB ETU, Faculty of Engineering, Department of Electrical & Electronics Engineering en_US
dc.contributor.department TOBB ETÜ, Mühendislik Fakültesi, Elektrik ve Elektronik Mühendisliği Bölümü tr_TR
dc.identifier.volume 122
dc.identifier.issue 3
dc.contributor.orcid https://orcid.org/0000-0002-0749-4205
dc.identifier.scopus 2-s2.0-85024894316
dc.contributor.tobbetuauthor Kurt, Hamza
dc.contributor.YOKid 200103
dc.identifier.doi 10.1063/1.4994032
dc.contributor.ScopusAuthorID 57189350201
dc.relation.publicationcategory Makale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı tr_TR


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