Article
Engineering, Electrical & Electronic
Hao Sun, Bruno Taglietti, Yue Wang, Lawrence R. Chen
Summary: Bragg gratings (BGs) are widely used in microwave photonic signal processing and systems due to their customizable amplitude and phase responses. Waveguide BGs (WBGs) are compact and easily integrated with other components to build MWP systems. Subwavelength grating (SWG) waveguides and passive devices in silicon-on-insulator (SOI) have enabled the development of breakthrough devices based on anisotropic metamaterials.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Review
Chemistry, Analytical
Muhammad A. Butt, Nikolay L. Kazanskiy, Svetlana N. Khonina
Summary: A Bragg grating is an optical device that reflects a specific wavelength of light while transmitting others. It is widely used in various scientific and industrial fields due to its simple construction and distinctive filtering capacity. WG BGs are easy to integrate and highly sensitive, making them suitable for sensing applications.
Article
Optics
Jiaxin Chen, Jinzhao Wang, Jiewen Li, Yong Yao, Yunxu Sun, Jiajun Tian, Yi Zou, Xiangjie Zhao, Xiaochuan Xu
Summary: To address the limitations of current silicon photonics based optical phased arrays, researchers have proposed an ultra-long waveguide grating antenna utilizing subwavelength segments to achieve small beam divergence and large field-of-view. By leveraging the bound state in the continuum effect, sidewall emission is effectively suppressed. This concept was theoretically demonstrated with a millimeter-long through-etched waveguide grating antenna that has compatible feature sizes with existing silicon photonics foundries.
Article
Optics
Xu Han, Yongheng Jiang, Huifu Xiao, Mingrui Yuan, Thach Giang Nguyen, Andreas Boes, Guanghui Ren, Yong Zhang, Qinfen Hao, Yikai Su, Arnan Mitchell, Yonghui Tian
Summary: Grating-assisted contra-directional couplers are important optical components in photonic integrated circuits (PICs) and are used as fundamental building blocks for various applications. LNOI has emerged as an attractive PIC platform with multiple active photonic circuit components, but lacks some passive photonic circuit components. This study proposes, designs and experimentally demonstrates a subwavelength grating-assisted contra-directional coupler in a silicon nitride-loaded LNOI waveguide platform. A three-channel wavelength-division (de)multiplexer is fabricated and experimentally demonstrated using the proposed coupler.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
Weicheng Chen, Dian Wan, Qi He, Jiaqi Wang, Haofeng Hu, Tiegen Liu, Hon Ki Tsang, Zhenzhou Cheng
Summary: Short-wavelength mid-infrared (MIR) silicon photonics has various applications in optical communications, chemical analysis, and environmental monitoring. In this study, a relaxed-tolerance subwavelength grating (SWG) coupler design with dual-hole structures was demonstrated to overcome fabrication variations and improve reproducibility. The relaxed-tolerance SWG coupler achieved a peak coupling efficiency of -6.2 dB at a wavelength of 2.038 μm with a 1-dB bandwidth of about 30 nm.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Weifeng Jiang, Jinzhu Hu, Siqiang Mao, Hanyu Zhang, Linjie Zhou, B. M. Azizur Rahman
Summary: This study proposes a novel broadband silicon four-mode (de)multiplexer that can (de)multiplex TE0, TE1, TE2, and TE3 modes using subwavelength gratings-assisted triple-waveguide couplers. Experimental results show high bandwidth and low insertion loss, making it suitable for increasing the transmission capacity of on-chip optical interconnects.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Multidisciplinary
Ting Li, Pei Yuan, Shufeng Li, Ke Li, Lianqing Zhu
Summary: Fiber Bragg grating (FBG) interrogator is a scientific instrument that indirectly monitors physical quantities by detecting the center wavelength of FBG. An arrayed waveguide grating (AWG), a fundamental part of the FBG interrogation system, is designed and fabricated for a photonic integrated FBG interrogation system with 12 channels, a 3 dB bandwidth of 2.23 nm, insertion loss of less than 5 dB, and crosstalk of -16.64 dB. The AWG has a wavelength resolution of 8 pm and a wavelength accuracy of 10.59 pm in the dynamic range of 0.8 nm, making it suitable for FBG interrogation systems.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Kevan K. MacKay, Shurui Wang, Pavel Cheben, Winnie N. Ye
Summary: This paper experimentally demonstrates a novel multimode waveguide implemented on a SOI platform, which supports multiple TE/TM modes across a wide range of wavelengths. Through optimized design and structure, it achieves low losses and cross-talk, showing good performance and reliability in practical applications.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Engineering, Electrical & Electronic
Eman A. Elzahaby, Ahmed M. R. Fath Elbab, Hossam M. H. Shalaby
Summary: This study proposes a converter that manipulates the energy exchange between two arbitrary guided modes with different mode orders and polarization states by engraving a periodic grating on a waveguide. The effectiveness of the structure is validated through theoretical analysis based on coupled-mode theory and coupling analysis, with experiments demonstrating the ability to achieve the desired function within a compact length and with stability.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Xuetong Zhou, Hon Ki Tsang
Summary: Using an optimized shift-pattern overlay method, a new high-efficiency silicon waveguide grating coupler operating at 1550 nm center wavelength was developed. The simulation predicted a coupling loss of 0.68 dB, and the experimentally measured loss was 0.89 dB. This achievement was obtained without the need for substrate bottom mirrors or electron beam lithography, using standard processes from a commercial foundry's multi-project wafer fabrication service.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Siming Weng, Pei Yuan, Lidan Lu, Dongliang Zhang, Lianqing Zhu
Summary: In this study, a novel silicon-based AWG was designed and fabricated as a critical component for fiber Bragg grating interrogation systems. By modifying the input waveguide with an MMI coupler, the AWG achieved higher demodulation precision and wider dynamic range. The optimized AWG exhibited excellent performance with low crosstalk, wide dynamic range, and high resolution, showing great potential for fiber Bragg grating interrogation.
OPTICAL FIBER TECHNOLOGY
(2022)
Article
Optics
Weike Zhao, Xiaolin Yi, Yingying Peng, Long Zhang, Haitao Chen, Daoxin Dai
Summary: This study uses the anisotropy of one-/two-dimensional subwavelength grating structures to achieve high-performance silicon multimode waveguide crossings. The proposed crossing exhibits compact footprints, low excess losses, and low intermode crosstalk.
LASER & PHOTONICS REVIEWS
(2022)
Article
Optics
Philippe Jean, Alexandre Douaud, Sophie LaRochelle, Younes Messaddeq, Wei Shi
Summary: Silicon subwavelength grating waveguides can be combined with high-index chalcogenide glass as a top cladding to modify waveguiding behavior, showcasing potential for modal confinement engineering and controlling light-matter interaction. The use of As20S80 with a negative thermo-optic coefficient allows for near-athermal behavior in these waveguides, with applications in reconfigurable photonics, nonlinear optics, metamaterials, or slow light.
Article
Nanoscience & Nanotechnology
Shufeng Li, Pei Yuan, Ting Li, Ke Li, Lianqing Zhu
Summary: This article presents a 15-channel 400 GHz AWG based on silicon on insulator (SOI) substrate, which has good spectral characteristics and can be used as a spectral device in the fiber Bragg grating (FBG) interrogation system.
PHOTONICS AND NANOSTRUCTURES-FUNDAMENTALS AND APPLICATIONS
(2023)
Article
Physics, Multidisciplinary
Lu Meng-Jia, Yun Bin-Feng
Summary: By utilizing bricked subwavelength grating (BSWG) based on silicon-on-insulator (SOI), compact TE0-TE1 and TE0-TE2 mode-order converters with low insertion loss and crosstalk, as well as wide operating bandwidth, have been successfully demonstrated in this work.
ACTA PHYSICA SINICA
(2023)