Continuously apodized fiber-to-chip surface grating coupler with refractive index engineered subwavelength structure | Zendy

Robert Halir | Zendy; Pavel Cheben | Zendy; Jens H. Schmid | Zendy; R. Ma | Zendy; D. Bédard | Zendy; Siegfried Janz | Zendy; DanXia Xu | Zendy; A. Densmore | Zendy; J. Lapointe | Zendy; Íñigo MolinaFernández | Zendy

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Continuously apodized fiber-to-chip surface grating coupler with refractive index engineered subwavelength structure

Author(s) -

Robert Halir,

Pavel Cheben,

Jens H. Schmid,

R. Ma,

D. Bédard,

Siegfried Janz,

DanXia Xu,

A. Densmore,

J. Lapointe,

Íñigo MolinaFernández

Publication year - 2010

Publication title -

optics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.524

H-Index - 272

eISSN - 1071-2763

pISSN - 0146-9592

DOI - 10.1364/ol.35.003243

Subject(s) - optics , apodization , refractive index , materials science , grating , diffraction grating , integrated optics , optical fiber , chip , optoelectronics , physics , telecommunications , computer science

We demonstrate a fully etched, continuously apodized fiber-to-chip surface grating coupler for the first time (to our knowledge). The device is fabricated in a single-etch step and operates with TM-polarized light, achieving a coupling efficiency of 3.7 dB and a 3 dB bandwidth of 60 nm. A subwavelength microstructure is employed to generate an effective medium engineered to vary the strength of the grating and thereby maximize coupling efficiency, while mitigating backreflections at the same time. Minimum feature size is 100 nm for compatibility with deep-UV 193 nm lithography.

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