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Title: Theoretical and experimental investigations of efficient light coupling with spatially varied all dielectric striped waveguides
Authors: Yılmaz, Yusuf Abdulaziz
 Tandoğan, S. E.
 Hayran, Z.
Giden, İbrahim Halil
 Turduev, Mirbek
 Kurt, Hamza
Keywords: Photonic crystals
graded photonic
Issue Date: Jul-2017
Publisher: American Institute Of Physics Inc.
Source: 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.
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).
ISSN: 218979
Appears in Collections:Elektrik ve Elektronik Mühendisliği Bölümü / Department of Electrical & Electronics Engineering
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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