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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 36, Iss. 14 — Jul. 15, 2011
  • pp: 2614–2617

High-performance and compact binary blazed grating coupler based on an asymmetric subgrating structure and vertical coupling

Junbo Yang, Zhiping Zhou, Honghui Jia, Xueao Zhang, and ShiQiao Qin  »View Author Affiliations


Optics Letters, Vol. 36, Issue 14, pp. 2614-2617 (2011)
http://dx.doi.org/10.1364/OL.36.002614


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Abstract

A high-performance and compact fiber-to-waveguide binary blazed subwavelength grating coupler was designed based on silicon-on-insulator. By the appropriate choice of waveguide/grating parameters, including thicknesses, periods, height, and fill factor, to optimize the mode matching, a relatively high coupling efficiency was obtained for the fiber and waveguide interface. Moreover, perfectly vertical fiber coupling is achieved by using an asymmetric subgrating structure in which a period consists of two subgratings with identical etching height and different widths. Coupling efficiency as high as 69% at a wavelength of 1.52 μm and 65% at a wavelength of 1.55 μm is calculated. Simultaneously, the 1 dB wavelength bandwidth is around 80 nm . The coupling efficiency can reach up to 80% or so if Bragg reflector layers are added. Finally, the device layout is simple, feasible, one-step etched, and compatible with standard complementary metal-oxide semiconductor technology processing.

© 2011 Optical Society of America

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(130.0130) Integrated optics : Integrated optics
(230.1360) Optical devices : Beam splitters

ToC Category:
Optoelectronics

History
Original Manuscript: March 1, 2011
Revised Manuscript: April 30, 2011
Manuscript Accepted: May 20, 2011
Published: July 11, 2011

Citation
Junbo Yang, Zhiping Zhou, Honghui Jia, Xueao Zhang, and ShiQiao Qin, "High-performance and compact binary blazed grating coupler based on an asymmetric subgrating structure and vertical coupling," Opt. Lett. 36, 2614-2617 (2011)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-36-14-2614


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