Systematic Design of a Highly Efficient Uniform Grating Coupler with Gradually Etched Depths for SOI Waveguides

This study systematically designs a grating coupler with gradually etched depth on the silicon-on-insulator (SOI) substrate. We focus on the modulation design of the grating coupler with gradually etched depth. The proposed grating coupler is suitable for single TE-mode fiber coupling at the wavelength of 1.55μm. Its fiber coupling efficiency can be up to 57%, fiber coupling angle is 8o and the 1dB bandwidth is 73 nm. These results are better than those of conventional uniform grating coupler without gradually etched depth in terms of efficiency. The grating coupler proposed here is easier to design as compared with the non-uniform grating couplers using lag effect.

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Compact grating couplers between optical fibers and Silicon-on-Insulator photonic wire waveguides with 69% coupling efficiency

2006 Optical Fiber Communication Conference and the National Fiber Optic Engineers Conference ◽

10.1109/ofc.2006.216051 ◽

2006 ◽

Cited By ~ 11

Author(s):

F. van Laere ◽

G. Roelkens ◽

J. Schrauwen ◽

D. Taillaert ◽

P. Dumon ◽

...

Keyword(s):

Optical Fibers ◽

Coupling Efficiency ◽

Silicon On Insulator ◽

Grating Couplers ◽

Photonic Wire

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Vertical Injection and Wideband Grating Coupler Based on Asymmetric Grating Trenches

10.21203/rs.3.rs-1018030/v1 ◽

2021 ◽

Author(s):

Md Asaduzzaman ◽

Robert J. Chapman ◽

Brett C. Johnson ◽

Alberto Peruzzo

Keyword(s):

Fdtd Method ◽

Coupling Efficiency ◽

Silicon On Insulator ◽

Subwavelength Structures ◽

Grating Coupler ◽

Subwavelength Gratings ◽

Vertical Injection ◽

Index Variation ◽

2D Fdtd ◽

Difference Time

Abstract A Silicon-on-insulator (SOI) perfectly vertical fibre-to-chip grating coupler is proposed and designed based on engineered subwavelength structures. The high directionality of the coupler is achieved by implementing step gratings to realize asymmetric diffraction and by applying effective index variation with auxiliary ultra-subwavelength gratings. The proposed structure is numerically analysed by using two-dimensional Finite Difference Time Domain (2D FDTD) method and achieves 76% (-1.19 dB) coupling efficiency and 39 nm 1-dB bandwidth.

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Modeling and Analysis of SOI Gratings-Based Opto-Fluidic Biosensor for Lab-on-a-Chip Applications

Photonics ◽

10.3390/photonics6020071 ◽

2019 ◽

Vol 6 (2) ◽

pp. 71 ◽

Cited By ~ 1

Author(s):

Venkatesha Muniswamy ◽

Prasant Kumar Pattnaik ◽

Narayan Krishnaswamy

Keyword(s):

Coupling Efficiency ◽

Microfluidic Channel ◽

Lab On A Chip ◽

Silicon On Insulator ◽

Grating Coupler ◽

Fluidic Channel ◽

Modeling And Analysis ◽

Injection Angle ◽

Grating Structure ◽

Optical Grating

The design, modeling, and analysis of a silicon-on-insulator (SOI) grating coupler integrated with a microfluidic channel for lab-on-a-chip applications are presented. The grating coupler was designed to operate at 1310 nm. The simulated SOI structure consisted of a 220 nm top-Si device layer with an integrated waveguide, grating coupler, and a buried oxide layer of 2 µm. A rectangular microfluidic channel was deposited on the SOI optical grating structure for light and fluid interaction. The fluidic flow through the device was driven by centrifugal and Coriolis forces. The grating structure was designed to achieve a maximum coupling efficiency at the optimized injection angle of the light source. The sensitivity of the grating structure could be analyzed and evaluated using the change in coupled power as a function of the effective refractive index and was found to be 0.928 × 10−6 RIU. The SOI optical grating structure along with the micro fluidic channel on top could be effectively used as an absorbance-based lab-on-a-chip biosensor.

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Large-Area Binary Blazed Grating Coupler between Nanophotonic Waveguide and LED

The Scientific World JOURNAL ◽

10.1155/2014/586517 ◽

2014 ◽

Vol 2014 ◽

pp. 1-6

Author(s):

Hongqiang Li ◽

Wenqian Zhou ◽

Meiling Zhang ◽

Yu Liu ◽

Cheng Zhang ◽

...

Keyword(s):

Incident Angle ◽

Coupling Efficiency ◽

Silicon On Insulator ◽

Grating Coupler ◽

Large Area ◽

Blazed Grating ◽

Light Emitting ◽

Arrayed Waveguide ◽

First Time ◽

Difference Time

A large-area binary blazed grating coupler for the arrayed waveguide grating (AWG) demodulation integrated microsystem on silicon-on-insulator (SOI) was designed for the first time. Through the coupler, light can be coupled into the SOI waveguide from the InP-based C-band LED for the AWG demodulation integrated microsystem to function. Both the length and width of the grating coupler are 360 μm, as large as the InP-based C-band LED light emitting area in the system. The coupler was designed and optimized based on the finite difference time domain method. When the incident angle of the light source is0°, the coupling efficiency of the binary blazed grating is 40.92%, and the 3 dB bandwidth is 72 nm at a wavelength of 1550 nm.

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