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Single-mode lasing in a coupled twin circular-side-octagon microcavity

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Chinese Physics B 2022年第9期31卷 313-319页

作者： Ke Yang Yue-De Yang Jin-Long Xiao yong-zhen huang State Key Laboratory of Integrated Optoelectronics Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

We demonstrate the curvature of coupled twin circular-side-octagon microcavity(TCOM)lasers as the degree of freedom to realize manipulation of mode quality(Q)factor and lasing *** simulation results indicate that mode Q factors varying from 10^(4) to 10^(8),wavelength intervals of different transverse modes,and mode numbers for four-bounce modes can be manipulated for five different *** mode distributes throughout coupled microcavity with mode Q factor around the order of 10^(4) or 10^(5).Four-bounce modes lase with injection currents applied single *** pumping both microcavities simultaneously,single-mode lasing for global modes with side mode suppression ratios(SMSRs)of 30,32,32,31,and 36 dB is achieved at the deformation of 0,0.5,1,1.5,and 2 with four-bounce modes suppressed,***,the linewidths less than 11 MHz for the single mode are obtained with the deformation of *** results show that the lasing modes can be efficiently manipulated considering variable curvature for TCOM lasers,which can promote practical applications of microcavity lasers.

关键词： semiconductor lasers whispering-galery mode coupled microcavity

Variable-curvature microresonators for dual-wavelength lasing

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Photonics Research 2017年第6期5卷 214-220页

作者： MIN TANG yong-zhen huang YUE-DE YANG HAI-ZHONG WENG ZHI-XIONG XIAO State Key Laboratory on Integrated Optoelectronics Institute of Semiconductors University of Chinese Academy of Sciences Chinese Academy of Sciences

Stable dual-mode semiconductor lasers can be applied for the photonic generation of microwave and terahertz waves. In this paper, the mode characteristics of a variable curvature microresonator are investigated by a twodimensional finite element method for realizing stable dual-mode lasing. The microresonator features a smooth boundary and the same symmetry as a square resonator. A small variable-curvature microresonator with a radius of 4 μm can support the fundamental four-bounce mode and the circular-like mode simultaneously, with quality factors up to the order of 10~4 and 10~5, respectively. The dual modes in the phase space of the Poincarésurface of sections distribute far from each other and can maintain enough stability for dual-mode ***, the refractive index and waveguide can modulate the dual-mode wavelength difference and quality factors efficiently thanks to the spatially separated fields of these two modes.

关键词： VCM Variable-curvature microresonators for dual-wavelength lasing

Whispering-gallery mode hexagonal micro-/nanocavity lasers [Invited]

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Photonics Research 2019年第5期7卷 594-607页

作者： Yue-De Yang Min Tang Fu-Li Wang Zhi-Xiong Xiao Jin-Long Xiao yong-zhen huang State Key Laboratory of Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Sciences Beijing 100083 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 China

Whispering-gallery-mode(WGM) hexagonal optical micro-/nanocavities can be utilized as high-quality(Q) resonators for realizing compact-size low-threshold lasers. In this paper, the progress in WGM hexagonal micro-/nanocavity lasers is reviewed comprehensively. High-Q WGMs in hexagonal cavities are divided into two kinds of resonances propagating along hexagonal and triangular periodic orbits, with distinct mode characteristics according to theoretical analyses and numerical simulations;however, WGMs in a wavelength-scale nanocavity cannot be well described by the ray model. Hexagonal micro-/nanocavity lasers can be constructed by both bottom-up and top-down processes, leading to a diversity of these lasers. The ZnO-or nitride-based semiconductor material generally has a wurtzite crystal structure and typically presents a natural hexagonal cross section. Bottom-up growth guarantees smooth surface faceting and hence reduces the scattering loss *** emissions have been successfully demonstrated in hexagonal micro-/nanocavities synthesized with various materials and structures. Furthermore, slight deformation can be easily introduced and precisely controlled in top-down fabrication, which allows lasing-mode manipulation. WGM lasing with excellent singletransverse-mode property was realized in waveguide-coupled ideal and deformed hexagonal microcavity lasers.

关键词： Whispering-gallery-mode(WGM) high-quality(Q) hexagonal micro- nanocavity lasers

Development of a random forest model for hypotension prediction after anesthesia induction for cardiac surgery

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World Journal of Clinical Cases 2021年第29期9卷 8729-8739页

作者： Xuan-Fa Li yong-zhen huang Jing-Ying Tang Rui-Chen Li Xiao-Qi Wang Department of Anesthesiology The Second Affiliated Hospital of Hainan Medical UniversityHaikou 570311Hainan ProvinceChina Department of Anesthesiology Hainan Hospital of Traditional Chinese MedicineHaikou 570203Hainan ProvinceChina Department of Anesthesiology Hainan Provincial People’s HospitalHaikou 570000Hainan ProvinceChina

BACKGROUND Hypotension after the induction of anesthesia is known to be associated with various adverse *** involvement of a series of factors makes the prediction of hypotension during anesthesia quite *** To explore the ability and effectiveness of a random forest(RF)model in the prediction of post-induction hypotension(PIH)in patients undergoing cardiac *** Patient information was obtained from the electronic health records of the Second Affiliated Hospital of Hainan Medical *** study included patients,≥18 years of age,who underwent cardiac surgery from December 2007 to January *** RF algorithm,which is a supervised machine learning technique,was employed to predict *** performance was assessed by the area under the curve(AUC)of the receiver operating *** decrease in the Gini index was used to rank various features based on their *** Of the 3030 patients included in the study,1578(52.1%)experienced hypotension after the induction of *** RF model performed effectively,with an AUC of 0.843(0.808-0.877)and identified mean blood pressure as the most important predictor of PIH after *** and body mass index also had a significant *** The generated RF model had high discrimination ability for the identification of individuals at high risk for a hypotensive event during cardiac *** study results highlighted that machine learning tools confer unique advantages for the prediction of adverse post-anesthesia events.

关键词： Anesthesia Hypotension prediction Cardiac surgery Random forest Machine learning

Widely tunable single-mode lasers based on a hybrid square/rhombus-rectangular microcavity

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Photonics Research 2019年第5期7卷 543-548页

作者： You-Zeng Hao Fu-Li Wang Min Tang Hai-Zhong Weng Yue-De Yang Jin-Long Xiao yong-zhen huang State Key Laboratory of Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Sciences Beijing 100083 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 China

Hybrid square/rhombus-rectangular lasers(HSRRLs) consisting of a Fabry–Perot(FP) cavity and a square/rhombus microcavity(SRM) are proposed and demonstrated for realizing single-mode lasing with a wide wavelength tuning range. The SRM is a deformed square microcavity with a vertex extended to the FP cavity to control the coupled mode field pattern in the FP cavity. Single-mode operation with a side-mode suppression ratio(SMSR) over 45.3 dB is realized, and a wide wavelength tuning range of 21 nm with SMSR >35 dB is further demonstrated by adjusting the injection currents of the SRM and the FP cavity simultaneously. Furthermore, a 3-dB modulation bandwidth of 14.1 GHz and an open-eye diagram at 35 Gb/s are demonstrated for the HSRRL.

关键词： Hybrid square/rhombus-rectangular lasers(HSRRLs) Fabry-Perot(FP) square/rhombus microcavity(SRM)

Relative intensity noise in high-speed hybrid square-rectangular lasers

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Photonics Research 2018年第3期6卷 193-197页

作者： FU-LI WANG XIU-WEN MA yong-zhen huang YUE-DE YANG JUN-YUAN HAN JIN-LONG XIAO State Key Laboratory on Integrated Optoelectronics Institute of Semiconductors & Institute of Material Science and Optoelectronic TechnologyUniversity of Chinese Academy of Sciences Chinese Academy of Sciences

Relative intensity noise(RIN) and high-speed modulation characteristics are investigated for an Al Ga In As/In P hybrid square-rectangular laser(HSRL) with square side length, rectangular length, and width of 15,300, and 2 μm, respectively. Single-mode operation with side-mode suppression larger than 40 dB has been realized for the HSRL over wide variation of the injection currents. In addition, the HSRL exhibits a 3 dB modulation bandwidth of 15.5 GHz, and an RIN nearly approaches standard quantum shot-noise limit 2 hv∕P=-164 dB∕Hz at high bias currents due to the strong mode selection of the square microcavity. With the increase of the DC bias current of the Fabry–Perot section, significantly enhanced modulation bandwidth and decreased RIN are ***, intrinsic parameters such as resonance frequency, damping factor, and modified Schawlow–Townes linewidth are extracted from the noise spectra.

关键词： RIN Relative intensity noise in high-speed hybrid square-rectangular lasers ISQ

Investigation of hybrid microring lasers adhesively bonded on silicon wafer

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Photonics Research 2015年第6期3卷 289-295页

作者： Shao-Shuai Sui Ming-Ying Tang Yue-De Yang Jin-Long Xiao Yun Du yong-zhen huang The State Key Laboratory on Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Sciences

Thermal characteristics are numerically investigated for the hybrid AlGaInAs/InP on silicon microring lasers with different ring radii and widths. Low threshold current and low active region temperature rise are expected for a microring laser with a narrow ring width. Based on the thermal analysis and the 3D simulation for mode characteristics, a hybrid AlGaInAs/InP on silicon microring lasers with an inner n-electrode laterally confined by the p-electrode metallic layer is fabricated using an adhesive bonding technique. A threshold current of 4 mA is achieved for a hybrid microring laser with a radius of 20 μm and a ring width of 3.5 μm at 12°C, and the corresponding threshold current density is as low as 1 kA∕cm^2. The influence of the location of silicon waveguide on output performance is studied experimentally for improving the output coupling efficiency. Furthermore,continuous-wave electrically injected lasing up to 55°C is realized for a hybrid microring laser with a radiusof 30 μm and a ring width of 3 μm.

关键词： Investigation of hybrid microring lasers adhesively bonded on silicon wafer InP mode

Octave-spanning frequency comb generation based on a dual-mode microcavity laser

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Photonics Research 2022年第9期10卷 2107-2114页

作者： TING WANG JI-LIANG WU XU-CHENG ZHANG YANG SHI YUE-DE YANG JIN-LONG XIAO DA-MING ZHANG GUAN-SHI QIN yong-zhen huang State Key Laboratory of Integrated Optoelectronics Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012China

Octave-spanning optical frequency comb(OFC)generation has achieved great breakthroughs and enabled significant applications in many fields,such as optical clocks and ***,we demonstrate octavespanning OFC generation with a repetition rate of tens of GHz via a four-wave mixing(FWM)effect seeded by a dual-mode microcavity laser for the first time,to our knowledge.A 120-m Brillouin nonlinear fiber loop is first utilized to generate wideband OFCs using the FWM ***,a time-domain optical pulse is shaped by appropriate optical filtering via fiber Bragg *** high-repetition-rate pulse train is further boosted to11 p J through optimal optical amplification and dispersion ***,an octave optical comb spanning from 1100 to 2200 nm is successfully realized through the self-phase modulation effect and dispersion wave generation in a commercial nonlinear optical *** dual-mode microcavity lasers with different mode intervals,we achieve frequency combs with octave bandwidths and repetition rates of 29–65 GHz,and demonstrate the dual-mode lasing microcavity laser as an ideal seeding light source for octave-spanning OFC generation.

关键词： laser fiber mode

The Fabrication and Characterization of Polarization Insensitive Semiconductor Optical Amplifier

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光学学报 2003年第S1期23卷 451-452页

作者： Lijuan Yu Weihua Guo Chunlin Han yong-zhen huang Xiaoyu Ma Manqing Tan State Key Lab. on Integrated Optoelectronics Institute of Semiconductors) Chinese Academy of Sciences Beijing 100083 China

An angled facet strained bulk InGaAs SOA has been designed and fabricated. A device with double-layer antireflection coatings had <2dB polarization sensitivity and <0.5dB gain ripple.

关键词： polarization sensitivity antireflection coatings