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Silicon photonic spectrometer with multiple customized wavelength bands

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Photonics Research 2024年第5期12卷 1016-1023页

作者： LONG ZHANG XIAOLIN YI DAJIAN LIU SHIHAN HONG GAOPENG WANG HENGZHEN CAO YAOCHENG SHI daoxin dai State Key Laboratory for Modern Optical Instrumentation Center for Optical&Electromagnetic ResearchCollege of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang UniversityZjingang CampusHangzhou 310058China Intelligent Optics and Photonics Research Center Jiaxing Research InstituteZhejiang UniversityJiaxing 314000China Ningbo Research Institute Zhejiang UniversityNingbo 315100China

A silicon photonic spectrometer with multiple customized wavelength bands is developed by introducing multiple channels of wideband optical filters based on multimode waveguide gratings(MWGs)for pre-filtering and the corresponding thermally tunable narrowband filter for high *** these multiple customized wavelength bands,the central wavelengths,bandwidths,and resolutions are designed flexibly as desired,so that the system is simplified and the footprint is minimized for several practical applications(e.g.,gas sensing).A customized silicon photonic spectrometer is designed and demonstrated experimentally with four wavelength bands centered around1310 nm,1560 nm,1570 nm,and 1930 nm,which is,to the best of our knowledge,the first on-chip spectrometer available for sensing multiple gas components like HF,CO,H_(2)S,and CO_(2).The spectral resolutions of the four wavelength bands are 0.11 nm,0.08 nm,0.08 nm,and 0.37 nm,*** a customized silicon photonic spectrometer shows great potential for various applications,including gas monitors,wearable biosensors,and portable spectral-domain optical coherence tomography.

关键词： waveguide bands multiple

Anisotropy-free arrayed waveguide gratings on X-cut thin film lithium niobate platform of in-plane anisotropy

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Light(Science & Applications) 2024年第7期13卷 1416-1426页

作者： Junjie Yi Changjian Guo Ziliang Ruan Gengxin Chen Haiqiang Wei Liwang Lu Shengqi Gong Xiaofu Pan Xiaowan Shen Xiaowei Guan daoxin dai Kangping Zhong Liu Liu State Key Laboratory of Extreme Photonics and Instrumentation College of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang UniversityHangzhou 310058China. Guangdong Provincial Key Laboratory of Optical Information Materials and Technology South China Academy of Advanced OptoelectronicsSouth China Normal UniversityHigher-Education Mega-CenterGuangzhou 510006China. National Center for International Research on Green Optoelectronics South China Normal UniversityGuangzhou 510006China Photonics Research Institute Department of Electrical and Electronic EngineeringThe Hong Kong Polytechnic UniversityHung HomKowloonHong Kong(SAR)China. Jiaxing Key Laboratory of Photonic Sensing&Intelligent Imaging Intelligent Optics&Photonics Research CenterJiaxing Research Institute Zhejiang UniversityJiaxing 314000China

Arrayed waveguide grating is a versatile and scalable integrated light dispersion device,which has been widely adopted in various applications,including,optical communications and optical ***,thin-film lithium niobate emerges as a promising photonic integration platform,due to its ability of shrinking largely the size of typical lithium niobate based optical *** would also enable multifunctional photonic integrated chips on a single lithium niobate ***,due to the intrinsic anisotropy of the material,to build an arrayed waveguide grating on X-cut thin-film lithium niobate has never been ***,a universal strategy to design anisotropyfree dispersive components on a uniaxial in-plane anisotropic photonic integration platform is introduced for the first *** leads to the first implementation of arrayed waveguide gratings on X-cut thin-film lithium niobate with various configurations and *** best insertion loss of 2.4 dB and crosstalk of−24.1 dB is obtained for the fabricated arrayed waveguide grating *** of such arrayed waveguide gratings as a wavelength router and in a wavelength-division multiplexed optical transmission system are also demonstrated.

关键词： waveguide arrayed lithium

Next-generation siliconphotonics:introduction

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Photonics Research 2022年第10期10卷 I0001-I0003页

作者： daoxin dai DI LIANG PAVEL CHEBEN State Key Laboratory for Modern Optical Instrumentation College of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang UniversityZijingang CampusHangzhou 310058China Hewlett Packard Labs Hewlett Packard EnterprisePalo AltoCalifornia 94304USA National Research Council of Canada OttawaOntario K1A 0R6Canada

In the past decade,silicon photonics has been making tremendous progress in terms of device functionality and performances as well as circuit integration for many practical applications ranging from communication,sensing,and information *** special issue,including four review articles and nine research articles,aims to provide a comprehensive overview of this exciting *** offer a collective summary of recent progresses,in-depth discussions of the state-of-the-art,and insights into forthcoming developments that are well poised to drive silicon photonics technology into its next generation.

关键词： collective discussions photonics

On-chip digitally tunable positive/negative dispersion controller using bidirectional chirped multimode waveguide gratings

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Advanced Photonics 2023年第6期5卷 72-82页

作者： Shujun Liu Ruitao Ma Zejie Yu Yaocheng Shi daoxin dai Zhejiang University College of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsState Key Laboratory for Extreme Photonics and InstrumentationHangzhouChina Jiaxing Key Laboratory of Photonic Sensing and Intelligent Imaging JiaxingChina Zhejiang University Jiaxing Research InstituteIntelligent Optics and Photonics Research CenterJiaxingChina Zhejiang University Ningbo Research InstituteNingboChina

A silicon-based digitally tunable positive/negative dispersion controller(DC)is proposed and realized for the first time using the cascaded bidirectional chirped multimode waveguide gratings(CMWGs),achieving positive and negative dispersion by switching the light propagation direction.A 1×2 Mach-Zehnder switch(MZS)and a 2×1 MZS are placed before and after to route the light path for realizing positive/negative *** device has Q stages of identical bidirectional CMWGs with a binary *** the digital tuning is convenient and scalable,and the total dispersion accumulated by all the stages can be tuned digitally from−(2^(Q)−1)D0 to(2^(Q)−1)D_(0) with a step of D_(0) by controlling the switching states of all 2×2 MZSs,where D_(0) is the dispersion provided by a single bidirectional CMWG ***,a digitally tunable positive/negative DC with Q=4 is designed and *** CMWGs are designed with a 4-mm-long grating section,enabling the dispersion D_(0) of about 4.16 ps∕nm in a 20-nm-wide *** dispersion is tuned from−61.53 to 63.77 ps∕nm by switching all MZSs appropriately,and the corresponding group delay is varied from−1021 to 1037 ps.

关键词： silicon photonics dispersion tuning digital tuning multimode waveguide grating

Ultralow-loss compact silicon photonic waveguide spirals and delay lines

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Photonics Research 2022年第1期10卷 1-7页

作者： SHIHAN HONG LONG ZHANG YI WANG MING ZHANG YIWEI XIE daoxin dai State Key Laboratory for Modern Optical Instrumentation Center for Optical&Electromagnetic ResearchCollege of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang UniversityZijingang CampusHangzhou 310058China Ningbo Research Institute Zhejiang UniversityNingbo 315100China

Low-loss and compact optical waveguides are key for realizing various photonic integrated circuits with long onchip delay lines,such as tunable optical delay lines,optical coherence tomography,and optical *** this paper,a low-loss and compact silicon photonic waveguide spiral is proposed by introducing broadened Archimedean spiral waveguides with a tapered Euler S-bend.A 100-cm-long waveguide spiral is realized with a minimal bending radius as small as 10 μm by using a standard 220-nm-thick silicon-on-insulator foundry process,and the measured propagation loss is as low as 0.28 dB/***,the present waveguide spirals are used to realize a 10-bit tunable optical delay line,which has a footprint as small as 2.2 mm × 5.9 mm and a dynamic range of 5120 ps with a fine resolution of 10 ps.

关键词： waveguide tunable delay

Low-loss chip-scale programmable silicon photonic processor

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Opto-Electronic Advances 2023年第3期6卷 25-41页

作者： Yiwei Xie Shihan Hong Hao Yan Changping Zhang Long Zhang Leimeng Zhuang daoxin dai Centre for Optical and Electromagnetic Research State Key Laboratory for Modern Optical InstrumentationZhejiang Provincial Key Laboratory for Sensing TechnologiesZhejiang UniversityZijingang CampusHangzhou 310058China Imec USA Nanoelectronics Design CenterInc.194 Neocity WayKissimmeeFL34744USA Ningbo Research Institute Zhejiang UniversityNingbo 315100China

Chip-scale programmable optical signal processors are often used to flexibly manipulate the optical signals for satisfying the demands in various applications,such as lidar,radar,and artificial *** photonics has unique advantages of ultra-high integration density as well as CMOS compatibility,and thus makes it possible to develop large-scale programmable optical signal *** challenge is the high silicon waveguides propagation losses and the high calibration complexity for all tuning elements due to the random phase *** this paper,we propose and demonstrate a programmable silicon photonic processor for the first time by introducing low-loss multimode photonic waveguide spirals and low-random-phase-error Mach-Zehnder *** present chip-scale programmable silicon photonic processor comprises a 1×4 variable power splitter based on cascaded Mach-Zehnder couplers(MZCs),four Ge/Si photodetectors,four channels of thermally-tunable optical *** channel consists of a continuously-tuning phase shifter based on a waveguide spiral with a micro-heater and a digitally-tuning delayline realized with cascaded waveguide-spiral delaylines and MZSs for 5.68 ps time-delay ***,these waveguide spirals used here are designed to be as wide as 2μm,enabling an ultralow propagation loss of 0.28 dB/***,these MZCs and MZSs are designed with 2-μm-wide arm waveguides,and thus the random phase errors in the MZC/MZS arms are negligible,in which case the calibration for these MZSs/MZCs becomes easy and furthermore the power consumption for compensating the phase errors can be reduced ***,this programmable silicon photonic processor is demonstrated successfully to verify a number of distinctively different functionalities,including tunable time-delay,microwave photonic beamforming,arbitrary optical signal filtering,and arbitrary waveform generation.

关键词： silicon photonics programmable photonic integrated circuit waveguide delay lines Mach-Zehnder interferometer

Ultrahigh-resolution on-chip spectrometer with silicon photonic resonators

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Opto-Electronic Advances 2022年第7期5卷 1-9页

作者： Long Zhang Ming Zhang Tangnan Chen Dajian Liu Shihan Hong daoxin dai State Key Laboratory for Modern Optical Instrumentation Center for Optical&Electromagnetic ResearchCollege of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang UniversityZijingang CampusHangzhou 310058China Ningbo Research Institute Zhejiang UniversityNingbo 315100China

A compact spectrometer on silicon is proposed and demonstrated with an ultrahigh *** consists of a thermally-tunable ultra-high-Q resonator aiming at ultrahigh resolution and an array of wideband resonators for achieving a broadened working *** present on-chip spectrometer has a footprint as compact as 0.35 mm^(2),and is realized with standard multi-project-wafer foundry *** measurement results show that the on-chip spectrometer has an ultra-high resolution Δλ of 5 pm and a wide working window of 10 *** dynamic range defined as the ratio of the working window and the wavelength resolution is as large as 1940,which is the largest for on-chip dispersive spectro-meters to the best of our *** present high-performance on-chip spectrometer has great potential for high-resolution spectrum measurement in the applications of gas sensing,food monitoring,health analysis,etc.

关键词： integrated photonics silicon spectrometer resonator

Advancing lasers in silicon photonics

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Light(Science & Applications) 2023年第10期12卷 2006-2006页

作者： daoxin dai State Key Laboratory for Extreme Photonics and Instrumentation College of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang UniversityZijingang CampusHangzhou 310058China

he integration of lasers has long been a significant challenge,impeding advancements in silicon photonic integrated circuits(PICs).Although the majority of applications necessitate lasers,most silicon PICs still need external off-chip lasers,as on-chip lasers have yet to match the performance of discrete ***,stable laser operation requires adequate isolation from downstream reflections,which can negatively influence the performance;thus,isolators are typically introduced between a laser and a silicon PIC.

关键词： lasers typically integration

Four-channel CWDM device on a thin-film lithium niobate platform using an angled multimode interferometer structure

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Photonics Research 2022年第1期10卷 8-13页

作者： GENGXIN CHEN ZILIANG RUAN ZONG WANG PUCHENG HUANG CHANGJIAN GUO daoxin dai KAIXUAN CHEN LIU LIU State Key Laboratory for Modern Optical Instrumentation College of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang UniversityHangzhou 310058China Guangdong Provincial Key Laboratory of Optical Information Materials and Technology South China Academy of Advanced OptoelectronicsSouth China Normal UniversityHigher-Education Mega-CenterGuangzhou 510006China National Center for International Research on Green Optoelectronics South China Normal UniversityGuangzhou 510006China

A compact and high-performance coarse wavelength-division multiplexing(CWDM) device is introduced with a footprint of 2.1 mm × 0.02 mm using an angled multimode interferometer structure based on a thin-film lithium niobate(TFLN) *** demonstrated device built on a 400 nm thick x-cut TFLN shows ultra-low insertion losses of <0.72 *** 3 dB bandwidths are 12.1 nm for all channels,and cross talks from adjacent channels are better than 18 *** peak wavelength positions comply with the CWDM standard with a channel spacing of 20 *** filter bandwidth of the proposed CWDM device can be tuned by adjusting the structural *** demonstrated CWDM device will promote future realization of multi-channel and multi-wavelength transmitter chips on TFLN.

关键词： interferometer channel CWDM