Design and numerical verification of a polarization-independent grating coupler using a double-layer approach for visible wavelengths applications

Khaleel Farooq Abdulghafoor; Tawfeeq Shelan Khasro

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Design and numerical verification of a polarization-independent grating coupler using a double-layer approach for visible wavelengths applications

机译：Design and numerical verification of a polarization-independent grating coupler using a double-layer approach for visible wavelengths applications

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In this paper, a double-layer approach is proposed to design a compact four states polarization-independent grating coupler (GC). The proposed polarization-independent GC is designed to couple a 700 nm polarized light propagated in a 150 nm Gallium Phosphide (GaP) waveguide to a polarization-maintaining fiber. The double-layer approach is based on the deposition of GaP gratings designed to couple the transverse magnetic (TM) light over the GaP gratings designed to couple the transverse electric (TE) light. The two layers are separated by a Hydrogen silsesquioxane (HSQ) with an optimum thickness of 20 nm. The grating periods and the fill factors of the two layers are optimized to achieve maximum possible coupling efficiency (CE). The proposed method resulted in relatively high CEs of 39.2, 31.1, and 23.3 for the TE, TM, and 45 degrees/-45 degrees linearly polarized light, respectively. The polarization-dependent loss (PDL) is 1 dB, 1.26 dB, and 2.26 dB corresponding to TE-TM, TM-45 degrees/-45 degrees, and TE-45 degrees/-45 degrees, respectively. The performance of the double-layer approach is numerically verified by the two-dimensional (2D) finite element algorithm (FEM) using COMSOL software. The proposed method suggests a novel and simple approach to design a compact four states polarization-independent GC that could be used in integrated (on-chip) photonic communication circuits.

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来源
《Optical and Quantum Electronics》 |2022年第1期|共15页
作者
Khaleel Farooq Abdulghafoor; Tawfeeq Shelan Khasro;
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作者单位

Univ Baghdad;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
中图分类光学;
关键词
Polarization-independent; Grating coupler; Photonic waveguide; Integrated photonic; COMSOL; Subwavelength structures; WAVE-GUIDE;

Design and numerical verification of a polarization-independent grating coupler using a double-layer approach for visible wavelengths applications

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