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| 1 | Passive technologies for future large-scale photonic integrated circuits on silicon: polarization handling, light non-reciprocity and loss reduction显示文摘Silicon-based large-scale photonic integrated circuits are becoming important,due to the need for higher complexity and lower cost for optical transmitters,receivers and optical buffers.In this paper,passive technologies for large-scale photonic integrated circuits are described,including polarization handling,light non-reciprocity and loss reduction.The design rule for polarization beam splitters based on asymmetrical directional couplers is summarized and several novel designs for ultra-short polarization beam splitters are reviewed.A novel concept for realizing a polarization splitter–rotator is presented with a very simple fabrication process.Realization of silicon-based light non-reciprocity devices(e.g.,optical isolator),which is very important for transmitters to avoid sensitivity to reflections,is also demonstrated with the help of magneto-optical material by the bonding technology.Low-loss waveguides are another important technology for large-scale photonic integrated circuits.Ultra-low loss optical waveguides are achieved by designing a Si3N4 core with a very high aspect ratio.The loss is reduced further to,0.1 dB m21 with an improved fabrication process incorporating a high-quality thermal oxide upper cladding by means of wafer bonding.With the developed ultra-low loss Si3N4 optical waveguides,some devices are also demonstrated,including ultra-high-Q ring resonators,low-loss arrayed-waveguide grating(de)multiplexers,and high-extinction-ratio polarizers. | Daoxin Dai Jared Bauters John E Bowers | 2012 | Light(Science & Applications)2012，1，1： | 28 |
| 2 | High-performance silicon−graphene hybrid plasmonic waveguide photodetectors beyond 1.55μm显示文摘Graphene has attracted much attention for the realization of high-speed photodetection for silicon photonics over a wide wavelength range.However,the reported fast graphene photodetectors mainly operate in the 1.55μm wavelength band.In this work,we propose and realize high-performance waveguide photodetectors based on bolometric/photoconductive effects by introducing an ultrathin wide silicon−graphene hybrid plasmonic waveguide,which enables efficient light absorption in graphene at 1.55μm and beyond.When operating at 2μm,the present photodetector has a responsivity of ~70 mA/W and a setup-limited 3 dB bandwidth of >20 GHz.When operating at 1.55μm,the present photodetector also works very well with a broad 3 dB bandwidth of >40 GHz(setup-limited)and a high responsivity of ~0.4 A/W even with a low bias voltage of−0.3 V.This work paves the way for achieving highresponsivity and high-speed silicon-graphene waveguide photodetection in the near/mid-infrared ranges,which has applications in optical communications,nonlinear photonics,and on-chip sensing. | Jingshu Guo Jiang Li Chaoyue Liu Yanlong Yin Wenhui Wang Zhenhua Ni Zhilei Fu Hui Yu Yang Xu Yaocheng Shi Yungui Ma Shiming Gao Limin Tong Daoxin Dai | 2020 | Light(Science & Applications)2020，9，1： | 10 |
| 3 | Ultrahigh-Q silicon racetrack resonators显示文摘An ultrahigh-Q silicon racetrack resonator is proposed and demonstrated with uniform multimode silicon photonic waveguides.It consists of two multimode straight waveguides connected by two multimode waveguide bends(MWBs).In particular,the MWBs are based on modified Euler curves,and a bent directional coupler is used to achieve the selective mode coupling for the fundamental mode and not exciting the higher-order mode in the racetrack.In this way,the fundamental mode is excited and propagates in the multimode racetrack resonator with ultralow loss and low intermode coupling.Meanwhile,it helps achieve a compact 180°bend to make a compact resonator with a maximized free spectral range(FSR).In this paper,for the chosen 1.6μm wide silicon photonic waveguide,the effective radius Reffof the designed 180°bend is as small as 29μm.The corresponding FSR is about 0.9 nm when choosing 260μm long straight waveguides in the racetrack.The present high-Q resonator is realized with a simple standard single-etching process provided by a multiproject wafer foundry.The fabricated device,which has a measured intrinsic Q-factor as high as 2.3×10~6,is the smallest silicon resonator with a>106Q-factor. | LONG ZHANG LANLAN JIE MING ZHANG YI WANG YIWEI XIE YAOCHENG SHI DAOXIN DAI | 2020 | Photonics Research2020，8，5： | 7 |
| 4 | Anisotropic metamaterial-assisted all-silicon polarizer with 415-nm bandwidth显示文摘Polarizers have been widely used in various optical systems to reduce polarization cross talk.The polarizers based on the silicon nanowire waveguide can provide chip-scale device size and a high polarization extinction ratio.However,the working bandwidth for the on-chip silicon polarizers is always limited(<~100 nm)by the strong waveguide dispersion.In this paper,an on-chip all-silicon polarizer with an extremely broad working bandwidth is proposed and demonstrated.The device is based on a 180°sharp waveguide bend,assisted with anisotropic subwavelength grating(SWG)metamaterial cladding to enhance the polarization selectivity.For TE polarization,the effective refractive index for SWG is extraordinary,so the incident TE mode can propagate through the sharp waveguide bend.For TM polarization,the effective refractive index for SWG is ordinary,so the incident TM mode will be coupled into the radiation mode regardless of the wavelength.The fabricated polarizer shows low loss(<1 d B)and high polarization extinction ratio(>20 d B)over a>415 nm bandwidth from1.26 to 1.675μm,which is at least fourfold better than what has been demonstrated in all previous works.To the best of our knowledge,such a device is the first all-silicon polarizer that covers O-,E-,S-,C-,L-,and U-bands. | HONGNAN XU DAOXIN DAI YAOCHENG SHI | 2019 | Photonics Research2019，7，12： | 5 |
| 5 | First demonstration of an on-chip quadplexer for passive optical network systems显示文摘An on-chip quadplexer is proposed and demonstrated with four wavelength-channels of 1270, 1310, 1490, and 1577 nm. The present quadplexer consists of four cascaded filters based on multimode waveguide grating(MWG), which are composed of a two-mode(de)multiplexer and an MWG. For the fabricated quadplexer on silicon, all four wavelength channels have flat-top responses with low excess losses of <0.5 dB as well as the desired bandwidths, which are about 16, 38, 19, and 6 nm, respectively. The cross-talk for both upstream channels and downstream channels is less than -24 dB. Moreover, the data transmission of 10 Gb∕s of the present silicon quadplexer is also successfully demonstrated. | DAJIAN LIU LONG ZHANG HEXIN JIANG DAOXIN DAI | 2021 | Photonics Research2021，9，5： | 4 |
| 6 | Ultralow-loss compact silicon photonic waveguide spirals and delay lines显示文摘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 gyroscopes.In 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/cm.Furthermore,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. | SHIHAN HONG LONG ZHANG YI WANG MING ZHANG YIWEI XIE DAOXIN DAI | 2022 | Photonics Research2022，10，1： | 3 |
| 7 | Silicon hybrid nanoplasmonics for ultra-dense photonic integration显示文摘最近混合的 plasmonic 波导作为一个有希望的候选人一直在变得很吸引人因为完成光和相对长的繁殖距离的 nano 规模监禁的能力,认识到下一代的极端稠密的 photonic 集成电路。而且,混合 plasmonic 波导也提供一个平台合并 photonics 和电子学以便一个人能为高速度的信号产生认识到极端小的 optoelectronic 集成电路(OEIC ) ,象察觉一样处理。在这份报纸,我们在各种各样的混合 plasmonic 波导以及最近开发的 ultrasmall 功能设备上为进步给了评论。 | Xiaowei GUAN Hao WU Daoxin DAI | 2014 | Frontiers of Optoelectronics2014，7，3： | 3 |
| 8 | Asymmetric directional couplers based on silicon nanophotonic waveguides and applications显示文摘方向性的 couplers (DC ) 为认识到力量交换作为一个基本元素一直在起一个重要作用。以前,大多数工作集中于对称的 DC,很少工作都没为不对称的方向性的 couplers (模数转换器) 被报导。在最近年,硅 nanophotonic 波导与超离频索引对比和极端小的生气的节被开发了很好,这被显示出基于 silicon-oninsulator ( SOI ), nanophotonic 波导有的模数转换器为象模式选择的联合一样的极化选择的联合的某唯一的能力,它是分别地为极化相关的系统和 modedivision-mulitplexing 系统很重要。在这份报纸,评论为力量切开,切开的极化横梁,以及模式 conversion/(de ) 在基于硅的模数转换器和应用程序上为最近的进步被给 multiplexing。 | Daoxin DAI Shipeng WANG | 2016 | Frontiers of Optoelectronics2016，9，3： | 3 |
| 9 | Wavelength-selective 2 × 2 optical switch based on a Ge2Sb2Te5-assisted microring显示文摘A novel wavelength-selective 2×2 optical switch based on a Ge2Sb2Te5(GST)-assisted microring-resonator(MRR)is proposed.The present GST-assisted MRR consists of two access optical waveguides and an MRR coupled with a bent GST-loaded silicon photonic waveguide.The 2×2 optical switch is switched ON or OFF by modifying the GST state to be crystalline or amorphous.In particular,the microring waveguide and the bent GST-loaded waveguide are designed to satisfy the phase-matching condition when the GST is crystalline.As a result,the MRR becomes highly lossy and the resonance peak is depressed significantly.On the other hand,when it is off,there is little coupling due to the significant phase mismatching.Consequently,one has a low-loss transmission at the drop port for the resonance wavelength.In this paper,the simulation using the three-dimensional finite-difference method shows that the extinction ratio of the designed photonic switch is^20 d B at the resonance wavelength,while the excess losses at the through port and drop port are 0.9 d B and 2 d B.In particular,the resonance wavelength changes little between the ON and OFF states,which makes it suitable for multichannel wavelength-division-multiplexing systems. | Changping Zhang Ming Zhang Yiwei Xie Yaocheng Shi Rajesh Kumar Roberto R.Panepucci Daoxin Dai | 2020 | Photonics Research2020，8，7： | 3 |
| 10 | Silicon/2D-material photodetectors: from nearinfrared to mid-infrared显示文摘Two-dimensional materials(2DMs)have been used widely in constructing photodetectors(PDs)because of their advantages in flexible integration and ultrabroad operation wavelength range.Specifically,2DM PDs on silicon have attracted much attention because silicon microelectronics and silicon photonics have been developed successfully for many applications.2DM PDs meet the imperious demand of silicon photonics on low-cost,high-performance,and broadband photodetection.In this work,a review is given for the recent progresses of Si/2DM PDs working in the wavelength band from near-infrared to mid-infrared,which are attractive for many applications.The operation mechanisms and the device configurations are summarized in the first part.The waveguide-integrated PDs and the surface-illuminated PDs are then reviewed in details,respectively.The discussion and outlook for 2DM PDs on silicon are finally given. | Chaoyue Liu Jingshu Guo Laiwen Yu Jiang Li Ming Zhang Huan Li Yaocheng Shi Daoxin Dai | 2021 | Light(Science & Applications)2021，10，7： | 3 |
| 11 | Four-channel CWDM device on a thin-film lithium niobate platform using an angled multimode interferometer structure显示文摘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) platform.The demonstrated device built on a 400 nm thick x-cut TFLN shows ultra-low insertion losses of <0.72 dB.Measured 3 dB bandwidths are 12.1 nm for all channels,and cross talks from adjacent channels are better than 18 dB.Its peak wavelength positions comply with the CWDM standard with a channel spacing of 20 nm.The filter bandwidth of the proposed CWDM device can be tuned by adjusting the structural parameters.This demonstrated CWDM device will promote future realization of multi-channel and multi-wavelength transmitter chips on TFLN. | GENGXIN CHEN ZILIANG RUAN ZONG WANG PUCHENG HUANG CHANGJIAN GUO DAOXIN DAI KAIXUAN CHEN LIU LIU | 2022 | Photonics Research2022，10，1： | 2 |
| 12 | Toward calibration-free Mach-Zehnder switches for next-generation silicon photonics显示文摘Silicon photonic Mach–Zehnder switches(MZSs)have been extensively investigated as a promising candidate for optical systems.However,conventional 2×2 MZSs are usually prone to the size variations of the arm waveguides due to imperfect fabrication,resulting in considerable random phase imbalance between the two arms,thereby imposing significant challenges for further developing next-generation N×N MZSs.Here we propose a novel design toward calibration-free 2×2 and N×N MZSs,employing optimally widened arm waveguides,enabled by novel compact tapered Euler S-bends with incorporated mode filters.With standard 180 nm CMOS foundry processes,more than thirty 2×2 MZSs and one 4×4 Benes MZS with the new design are fabricated and characterized.Compared with their conventional counterparts with 0.45-μm-wide arm waveguides,the present 2×2 MZSs exhibit significant reduction in the random phase imbalance.The measured extinction ratios of the present 2×2 and 4×4 MZSs operating in the all-cross state are 27-49 dB and∼20dB across the wavelength range of∼60nm,respectively,even without any calibrations.This work paves the way toward calibration-free large-scale N×N MZSs for next-generation silicon photonics. | Lijia Song Tangnan Chen Weixi Liu Hongxuan Liu Yingying Peng Zejie Yu Huan Li Yaocheng Shi Daoxin Dai | 2022 | Photonics Research2022，10，3： | 2 |
| 13 | Photocatalytic decolorization of dispersol dyes显示文摘PhotocatalyticdecolorizationofdispersoldyesYouDaoxin;DaiShugui(DepartmentofEnvironmentalScienee,NankaiUniversity,Tianjin30007... | You Daoxin Dai Shugui(Department of Environmental Scienee, Nankai University, Tianjin 300071, China)Xie Huasheng(Tianjin Environmental Protection Bureau, Tianjin 300191, China) | 1994 | Journal of Environmental Sciences1994，6，2： | 2 |
| 14 | Science Letters:The Moore’s Law for photonic integrated circuits显示文摘We formulate a “Moore’s law” for photonic integrated circuits (PICs) and their spatial integration density using two methods. One is decomposing the integrated photonics devices of diverse types into equivalent basic elements, which makes a comparison with the generic elements of electronic integrated circuits more meaningful. The other is making a complex compo- nent equivalent to a series of basic elements of the same functionality, which is used to calculate the integration density for func- tional components realized with different structures. The results serve as a benchmark of the evolution of PICs and we can con- clude that the density of integration measured in this way roughly increases by a factor of 2 per year. The prospects for a continued increase of spatial integration density are discussed. | THYLEN L. HE Sailing WOSINSKI L. DAI Daoxin | 2006 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2006，7，12： | 2 |
| 15 | On-chip single-mode CdS nanowire laser显示文摘By integrating a free-standing cadmium sulfide(CdS)nanowire onto a silicon nitride(SiN)photonic chip,we demonstrate a highly compact on-chip single-mode CdS nanowire laser.The mode selection is realized using a Mach-Zehnder interferometer(MZI)structure.When the pumping intensity exceeds the lasing threshold of 4.9 kW/cm^(2),onchip single-mode lasing at ~518.9 nm is achieved with a linewidth of 0.1 nm and a side-mode suppression ratio of up to a factor of 20(13 dB).The output of the nanowire laser is channelled into an on-chip SiN waveguide with high efficiency(up to 58%)by evanescent coupling,and the directional coupling ratio between the two output ports can be varied from 90 to 10% by predesigning the coupling length of the SiN waveguide.Our results open new opportunities for both nanowire photonic devices and on-chip light sources and may pave the way towards a new category of hybrid nanolasers for chip-integrated applications. | Qingyang Bao Weijia Li Peizhen Xu Ming Zhang Daoxin Dai Pan Wang Xin Guo Limin Tong | 2020 | Light(Science & Applications)2020，9，1： | 1 |
| 16 | Compact microring resonator with 2 x 2 tapered multimode interference cou- plers 显示文摘 | Dai Daoxin Liu Yang Zhen Sheng | 2009 | Journal of Light Wave Technology2009，27，21： | 1 |
| 17 | Silicon-plus photonics显示文摘因为他们与成熟互补金属氧化物半导体技术的相容性,硅 photonics 变得很流行。然而,纯硅仍然是很困难的被利用获得各种各样的 photonic 为大规模 photonic 集成的功能的设备由于内在的性质。硅正的 photonics,哪个 pluses 打破硅的限制的另外的材料,当前并且以后正在起一个很重要的作用。在这份报纸,我们给 siliconplus 的进步上的评论和讨论 photonics,包括结构。 | Daoxin DAI Yanlong YIN Longhai YU Hao WU Di LIANG Zhechao WANG Liu LIU | 2016 | Frontiers of Optoelectronics2016，9，3： | 1 |
| 18 | Gain enhancement in a hybrid plasmonicnano-waveguide with a low-index or high-index gain medium显示文摘 | Dai Daoxin Shi Yaocheng He Sailing | 2011 | Opt Express2011，19，12： | 1 |
| 19 | Compact electro-optic modulator on lithium niobate显示文摘Fast electro-optic modulators with an ultracompact footprint and low power consumption are always highly desired for optical interconnects.Here we propose and demonstrate a high-performance lithium niobate electro-optic modulator based on a new 2×2 Fabry–Perot cavity.In this structure,the input and reflected beams are separated by introducing asymmetric multimode-waveguide gratings,enabling TE_(0)−TE_(1)mode conversion.The measured results indicate that the fabricated modulator features a low excess loss of∼0.9dB,a high extinction ratio of∼21dB,a compact footprint of∼2120μm^(2),and high modulation speeds of 40 Gbps OOK and 80 Gbps PAM4 signals.The demonstrated modulator is promising for high-speed data transmission and signal processing. | Bingcheng Pan Hongyuan Cao Yishu Huang Zong Wang Kaixuan Chen Huan Li Zejie Yu Daoxin Dai | 2022 | Photonics Research2022，10，3： | 1 |
| 20 | Sub-nanosecond-speed frequency-reconfigurable photonic radio frequency switch using a silicon modulator显示文摘Radio frequency(RF)switches are essential for implementing routing of RF signals.However,the increasing demand for RF signal frequency and bandwidth is posing a challenge of switching speed to the conventional solutions,i.e,the capability of operating at a sub-.nanosecond speed or faster.In addition,signal frequency reconfigurability is also a desirable feature to facilitate new innovations of flexible system functions.Utilizing microwave photonics as an alter-native path,we present here a photonic implementation of an RF switch providing not only the capability of switching at a sub-nanosecond speed but also options of frequency doubling of the input RF signals,allowing for flexible output waveforms.The core device is a traveling wave silicon modulator with a device size of0.2 mm × 1.8 mm and a modu-lation bandwidth of 10 GHz.Using microwave frequencies,i.e.,15 GHz and 20 GHz,as two simultaneous RF input signals,we experimentally demonstrated their amplitude and frequency switching as well as that of the doubled frequencies,ie,30 GHz and 40 GHz,at a switching frequency of 5 GHz.The results of this work point to a solution for creating high speed RF switches with high compactness and flexibility. | YIWEI XIE LEIMENG ZHUANG PENGCHENG JIAO DAOXIN DAI | 2020 | Photonics Research2020，8，6： | 1 |
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