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Progress in Electromagnetic Research Symposium (PIERS)

作者： Tongxin Yang Shiqi Zhang Lei Zhang State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing China School of Integrated Circuits Beijing University of Posts and Telecommunications Beijing China

ISBN: (数字)9798350375909

ISBN: (纸本)9798350375916

We demonstrate a compact on-chip spectrometer by cascading a tunable micro-ring resonator (MRR) and a Mach-Zehnder interferometer (MZI)-based 4-channel demultiplexer. The MRR acts as a high-fineness optical filter with tunable periodic narrow passbands. The function of the MZI-based demultiplexer is to separate passbands of the MRR to be measured by different photodetectors. The 3 dB bandwidth of the MRR's passband is 0.15 nm, which determines the resolution of the spectrometer. We fabricate the device on SOI substrate and verify its feasibility by measuring two laser lines with different wavelength spacing. We also discuss possible ways to further improve the resolution of the device.

关键词： Mach-Zehnder interferometers Q-factor Wavelength measurement optical resonators Bandwidth System-on-chip Passband

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Silicon Waveguide Cross-sectional Dimension Estimation Based on Effective Refractive Index Extraction

Silicon Waveguide Cross-sectional Dimension Estimation Based...

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Progress in Electromagnetic Research Symposium (PIERS)

作者： Enge Zhang Xiaoran Zhu Lei Zhang School of Integrated Circuits Beijing University of Posts and Telecommunications Beijing China State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing China

ISBN: (数字)9798350375909

ISBN: (纸本)9798350375916

We experimentally demonstrate a novel method for acquiring the cross-sectional measurements of silicon-on-insulation (SOI) waveguides. This technique utilizes two micro-rings with distinct perimeters and an algorithm to evaluate the cross-sectional dimensions and the effective refractive index (n eff ) without resorting to chip cutting. This technique is essential in comprehending the factual output capability of the manufacturing facility, the practical waveguide structure of the SOI chip and the actual performance of the devices on the chip, and is of great importance for future chip design.

关键词： Performance evaluation Semiconductor device measurement Accuracy Refractive index Estimation Electromagnetic waveguides Silicon

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Silicon Integrated Computational Spectrometer with Cascaded Add-Drop Micro-Ring Resonators

Silicon Integrated Computational Spectrometer with Cascaded ...

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International Conference on optical communications and Networks (ICOCN)

作者： Kai Wang Zeruihong She Hongren Tan Tianyue Zhang Lei Zhang State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing China School of Integrated Circuits Beijing University of Posts and Telecommunications Beijing China

We report the design and implementation of an integrated computational spectrometer on a silicon-on-insulator substrate. The device has 31 filter units, which are cascaded add-drop micro-ring resonators with different... 详细信息

ISBN: (数字)9798350367652

ISBN: (纸本)9798350367669

关键词： optical filters Resonator filters Silicon-on-insulator Silicon photonics optical fiber communication Structural engineering Proposals

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Polarization-insensitive 1 × 2 Multi-mode Interference Coupler on SOI

Polarization-insensitive 1 × 2 Multi-mode Interference Coup...

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Progress in Electromagnetic Research Symposium (PIERS)

作者： Liuwei Chen Enge Zhang Lei Zhang State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing China School of Integrated Circuits Beijing University of Posts and Telecommunications Beijing China

ISBN: (数字)9798350375909

ISBN: (纸本)9798350375916

We demonstrate a polarization-insensitive multimode interference (MMI) coupler on SOI platform with 220 nm top silicon. The minimum feature size of the device is 235 nm. The simulated and measured excess losses for TE/TM modes at 1550 nm are 0.07 dB/0.08 dB and 0.16dB/0.12dB, respectively. Over the C band, the device exhibits an excess loss of less than 0.5 dB and 0.8 dB in simulation and measurement, respectively.

关键词： C-band Interference Couplers Loss measurement Silicon Electromagnetics

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Two-dimensional Ga2XY monolayer containing vacancies for highly efficient electrocatalytic hydrogen reaction: Based on first-principles calculations

Two-dimensional Ga2XY monolayer containing vacancies for hig...

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Chinese Materials Conference 2022-2023

作者： Wei, F. Gao, J.M. Jia, B.N. Hao, J.B. Liu, G. Lu, P.F. State Key Laboratory of Information Photonics and Optical Communications School of Electronic Engineering Beijing University of Posts and Telecommunications Beijing100876 China School of Integrated Circuits Beijing University of Posts and Telecommunications Beijing100876 China School of Science Xi'An University of Architecture and Technology Xi'an710055 China

Hydrogen energy as an excellent substitute for traditional fossil fuels, has received widespread attention. There is an urgent need to find an efficient and environmentally friendly electrocatalyst to increase hydrogen production. In this study, the Ga2XY (X, Y=O, S, Se, Te, X≠Y) system of group III-VI compounds was constructed, and the HER catalytic properties of its vacancy structure were investigated based on first principles. The research results show that all the structures are stable, and the introduction of O vacancy and Ga vacancy can significantly improve the structure's Gibbs free energy ( "GH). When the H atom is adsorbed on the bottom Ga atom, the HER with Ga2OSe structure containing outer Ga vacancy is very excellent, and its "GH can reach 0.07 eV, which is significantly superior to the currently recognized best HER catalyst Pt. Our research provides a new strategy for the design of HER electrocatalysts and a new method for the regulation of Ga2XY monolayers. © Published under licence by IOP Publishing Ltd.

关键词： Electrocatalysts

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Micro-Spectrometer with a Beam Splitting Network with Distributed All-Pass Micro-Ring Resonators

Micro-Spectrometer with a Beam Splitting Network with Distri...

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International Conference on optical communications and Networks (ICOCN)

作者： Hongren Tan Kai Wang Zeruihong She Tianyue Zhang Lei Zhang State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing China School of Integrated Circuits Beijing University of Posts and Telecommunications Beijing China

ISBN: (数字)9798350367652

ISBN: (纸本)9798350367669

We demonstrate an integrated computational spectrometer with 62 all-pass micro-ring resonators (MRRs), which are distributed in a beam splitting network composed by 31 multi-mode interferometers (MMIs). Measured results show that it has a resolution of 200pm in the C-band. It can be further improved through the optimization of structural parameters and channel number.

关键词： Spectroscopy Semiconductor device measurement C-band Silicon optical fiber communication Structural engineering Resonators

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Extraction of group refractive index of silicon waveguide using two racetrack resonators 21

Extraction of group refractive index of silicon waveguide us...

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21st International Conference on optical communications and Networks, ICOCN 2023

作者： Zhu, Xiaoran Zhang, Enge Yang, Tongxin Zhang, Shiqi Chen, Liuwei Liu, Zilong Yang, Xu Zhang, Lei Beijing University of Posts and Telecommunications State Key Laboratory of Information Photonics and Optical Communications Beijing100876 China Beijing University of Posts and Telecommunications School of Integrated Circuits Beijing100876 China The 54th Research Institute of China Electronic Technology Group Corporation Shijiazhuang050081 China

ISBN: (纸本)9798350343502

We present the extraction of group refractive index of a silicon waveguide of 450 nm × 220 nm with a slab of 70 nm using the spectral responses of two racetrack resonators with perimeters of 405.66 μ m and 505.66 μ m, respectively. We assume a cubic polynomial relation between the effective refractive index and the wavelength. An analytic expression for the group refractive indexes of both straight and bend waveguides can be obtained using the two measured spectra. The calculated n g at 1550 nm is 3.922. This method offers a simple calibration tool in the optical delay line design. © 2023 IEEE.

关键词： Extraction

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Energy-efficient variable optical attenuator on SOI with folded waveguides and heaters 21

Energy-efficient variable optical attenuator on SOI with fol...

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21st International Conference on optical communications and Networks, ICOCN 2023

作者： Zhang, Shiqi Yang, Tongxin Zhu, Xiaoran Zhang, Enge Chen, Liuwei Liu, Zilong Yang, Xu Fu, Xiuli Zhang, Lei Beijing University of Posts and Telecommunications State Key Laboratory of Information Photonics and Optical Communications Beijing100876 China Beijing University of Posts and Telecommunications School of Integrated Circuits Beijing100876 China The 54th Research Institute of China Electronic Technology Group Corporation Shijiazhuang050081 China

ISBN: (纸本)9798350343502

We report a variable optical attenuator (VOA) on silicon-on-insulator (SOI) with folded silicon waveguides and TiW heaters to improve the thermal efficiency. The measured extinction ratio of the device is around 20.4 dB with a power consumption of 10.2 mW. The rise and fall times are 17.2 μs and 17.55 μs, respectively. © 2023 IEEE.

关键词： Energy efficiency

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Integrated 4-channel wavelength selective switch based on second-order micro-ring resonators 21

Integrated 4-channel wavelength selective switch based on se...

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21st International Conference on optical communications and Networks, ICOCN 2023

作者： Yang, Tongxin Zhang, Shiqi Liu, Zilong Zhu, Xiaoran Zhang, Enge Chen, Liuwei Yang, Xu Zhang, Lei Beijing University of Posts and Telecommunications State Key Laboratory of Information Photonics and Optical Communications Beijing100876 China Beijing University of Posts and Telecommunications School of Integrated Circuits Beijing100876 China The 54th Research Institute of China Electronic Technology Group Corporation Shijiazhuang050081 China

We report a 4-channel wavelength selective switch (WSS) with four second-order micro-ring resonators (MRRs). Each MRR has a flat-top spectrum and are tuned with two micro-heaters. The WSS exhibits a 3dB bandwidth of 7... 详细信息

ISBN: (纸本)9798350343502

关键词： optical resonators

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Dual-band polarized upconversion photoluminescence enhanced by resonant dielectric metasurfaces

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eLight 2023年第1期3卷 57-65页

作者： Ziwei Feng Tan Shi Guangzhou Geng Junjie Li Zi-Lan Deng Yuri Kivshar Xiangping Li Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Institute of Photonics TechnologyJinan UniversityGuangzhou 511443China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Nonlinear Physics Centre Research School of PhysicsAustralian National UniversityCanberraACT 2601Australia Qingdao Innovation and Development Center of Harbin Engineering University Qingdao 266000China

Lanthanide-doped upconversion nanoparticles emerged recently as an attractive material platform underpinning a broad range of innovative applications such as optical cryptography,luminescent probes,and ***,the intricate 4f-associated electronic transition in upconversion nanoparticles leads only to a weak photoluminescence intensity and unpolarized emission,hindering many applications that demand ultrabright and polarized light ***,we present an effective strategy for achieving ultrabright and dual-band polarized upconversion *** employ resonant dielectric metasurfaces supporting high-quality resonant modes at dual upconversion bands enabling two-order-of-magnitude amplification of upconversion *** demonstrate that dual-band resonances can be selectively switched on polarization,endowing cross-polarization controlled upconversion luminescence with ultra-high degrees of polarization,reaching approximately 0.86 and 0.91 at dual emission wavelengths of 540 and 660 nm,*** strategy offers an effective approach for enhancing photon upconversion processes paving the way towards efficient low-threshold polarization upconversion lasers.

关键词： polarization polarized resonant

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