Crosstalk reduction of silicon waveguide array by high-reflection boundary

Guangzhu Zhou; Shi-Wei Qu; Jieyun Wu; Shiwen Yang

doi:10.1117/12.2604431

13 December 2021 Crosstalk reduction of silicon waveguide array by high-reflection boundary

Guangzhu Zhou, Shi-Wei Qu, Jieyun Wu, Shiwen Yang

Proceedings Volume 12074, 10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Novel Optoelectronic Functional Materials and Devices; 1207408 (2021) https://doi.org/10.1117/12.2604431
Event: Tenth International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2021), 2021, Chengdu, China

Abstract

Large-scale integrated optical phased arrays (OPAs) can provide small angular resolutions for LiDAR applications. However, strong coupling between waveguides will occur under sub-wavelength element pitch, posing a limitation to the development of high-performance OPAs. To reduce the coupling between waveguides, high-reflection boundaries made up of high-contrast gratings (HCGs) are arranged on both sides along silicon strip waveguides. At the same time, light is radiated into free space with controlled radiating rates by the HCGs periodically perturbing evanescent fields of silicon strip waveguide. Simulation results show that the crosstalk reduction of the designed array is over 10 dB compared to traditional waveguide array with identical sizes within the wavelength ranges of 1500 ~ 1590 nm. Furthermore, a weak radiation strength of 1.15 mm^-1 is achieved, yielded an effective radiation length up to 2 mm. Therefore, combining with the low crosstalk between under the deigned sub-wavelength element pitch of 0.645λ and the long effective radiation length, our design holds promise for high-performance OPAs with a large field of view and a high angular resolution.

Citation Download Citation

Guangzhu Zhou, Shi-Wei Qu, Jieyun Wu, and Shiwen Yang "Crosstalk reduction of silicon waveguide array by high-reflection boundary", Proc. SPIE 12074, 10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Novel Optoelectronic Functional Materials and Devices, 1207408 (13 December 2021); https://doi.org/10.1117/12.2604431

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KEYWORDS

Waveguides

Silicon

Radiation effects

Beam steering

LIDAR

Reflectivity

Light wave propagation

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