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Mechanisms of enhanced sub-bandgap absorption in high-speed all-silicon avalanche photodiodes

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Photonics Research 2023年第2期11卷 337-346页

作者： YUAN YUAN WAYNE V.SORIN DI LIANG STANLEY CHEUNG YIWEI PENG MUDIT JAIN ZHIHONG HUANG MARCO FIORENTINO RAYMOND G.BEAUSOLEIL hewlett packard Labs Hewlett Packard EnterpriseMilpitasCalifornia 95035USA

All-silicon (Si) photodiodes have drawn significant interest due to their single and simple material system and perfect compatibility with complementary metal-oxide semiconductor photonics. With the help from a cavity enhancement effect, many of these photodiodes have shown considerably high responsivity at telecommunication wavelengths such as 1310 nm, yet the mechanisms for such high responsivity remain unexplained. In this work,an all-Si microring is studied systematically as a photodiode to unfold the various absorption ***-6.4 V, the microring exhibits responsivity up to0.53 A∕W with avalanche gain, a 3 dB bandwidth of25.5 GHz, and open-eye diagrams up to 100 Gb/s. The measured results reveal the hybrid absorption mechanisms inside the device. A comprehensive model is reported to describe its working principle, which can guide future designs and make the all-Si microring photodiode a promising building block in Si photonics.

关键词： Gb/s avalanche absorption

64 Gb/s low-voltage waveguide SiGe avalanche photodiodes with distributed Bragg reflectors

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Photonics Research 2020年第7期8卷 1118-1123页

作者： Binhao Wang Zhihong Huang Yuan Yuan Di Liang Xiaoge Zeng Marco Fiorentino Raymond G.Beausoleil hewlett packard laboratories Hewlett Packard EnterprisePalo AltoCalifornia 94304USA

We demonstrate low-voltage waveguide silicon-germanium avalanche photodiodes(APDs)integrated with distributed Bragg reflectors(DBRs).The internal quantum efficiency is improved from 60%to 90%at 1550 nm assisted with DBRs while still achieving a 25 GHz bandwidth.A low breakdown voltage of 10 V and a gain bandwidth product of near 500 GHz are *** with DBRs at a data rate of 64 Gb/s pulse amplitude modulation with four levels(PAM4)show a 30%–40%increase in optical modulation amplitude(OMA)compared to APDs with no DBR.A sensitivity of around-13 d Bm at a data rate of 64 Gb/s PAM4 and a bit error rate of 2.4×10^-4 is realized for APDs with DBRs,which improves the sensitivity by^2 d B compared to APDs with no DBR.

关键词： Gb/s waveguide avalanche

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

Advances in Home Photo Printing

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仪器仪表学报 2004年第S3期 116-120页

作者： Brian Atkins hewlett-packard laboratories CA 94304 USA Palo Alto

With digital camera adoptions going main stream, consumers capture a record number of photos. Currently, the majority of the digital photos are printed at home. One of the key enablers of this transformation is the advancement of home photo printing technologies. In the past few years, inkjet printing technologies have continued to deliver smaller drop size, larger number of inks, and longer-lasting prints. In the mean time, advanced image processing automatically enhances captured digital photos while being printed. The combination of the above two forces has closed the gap between the home photo prints and AgX prints. It will give an overview of the home photo printing market and technology trends, and discuss major advancements in automatic image processing.

关键词： Image processing Printing Automatic enhancement

A regression model-based method for indoor positioning with compound location fingerprints

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Geo-Spatial Information Science 2019年第2期22卷 107-113,I0003页

作者： Tomofumi Takayama Takeshi Umezawa Nobuyoshi Komuro Noritaka Osawa hewlett-packard Japan LtdTokyoJapan Graduate School of Engineering Chiba UniversityChibaJapan

This paper proposed and evaluated an estimation method for indoor *** method combines location fingerprinting and dead reckoning differently from the conventional *** uses compound location fingerprints,which are composed of radio fingerprints at multiple points of time,that is,at multiple positions,and displacements between them estimated by dead *** avoid errors accumulated from dead reckoning,the method uses short-range dead *** method was evaluated using 16 Bluetooth beacons installed in a student room with the dimensions of 11×5 m with furniture *** Received Signal Strength Indicator(RSSI)values of the beacons were collected at 30 measuring points,which were points at the intersections on a 1×1 m grid with no obstacles.A compound location fingerprint is composed of RSSI vectors at two points and a displacement vector between *** Forests(RF)was used to build regression models to estimate positions from location *** root mean square error of position estimation was 0.87 m using 16 Bluetooth *** error is lower than that received with a single-point baseline model,where a feature vector is composed of only RSSI values at one *** results suggest that the proposed method is effective for indoor positioning.

关键词： Indoor positioning integrated estimation radio fingerprinting dead reckoning machine learning non-linear regression

Phosphine oxide-functionalized polyfluorene derivatives:Synthesis,photophysics,electrochemical properties,and electroluminescence performance

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Science China Chemistry 2011年第4期54卷 678-684页

作者： LIU DeAng GIBSON Gary BRUG James LAM Sity MAO Samuel S Lawrence Berkeley National Laboratory and Department of Mechanical Engineering University of CaliforniaBerkeleyCAUSA Information Surfaces Lab Hewlett Packard LabsHewlett Packard Company1501 Page Mill RoadPalo AltoCA 94304USA

A series of phosphine oxide-functionalized polyfluorene derivatives,PFH-PO-40-1 (P1),PFH-PO-20-1 (P2),PFH-PO-10-1 (P3),and PFH-PO-1-1 (P4),were prepared via a palladium-mediated Suzuki cross-coupling *** structures and purities of all polymers were fully characterized by 1H and 13C NMR,UV-vis and photoluminescent spectroscopy,gel permeation chromatography,and TGA/*** emission features showed single broad peaks at about 445 nm in film,compared with those in dilute solutions,which might be caused by some degree of aggregation in the excited states of the *** best electroluminescence (EL) performance of these polymers with configuration of ITO/PEDOT:PSS/Polymer/Alq3/LiF/Al was obtained from P1 (current efficiency was 4.2 Cd/A at 6V).

关键词：电致发光性能聚芴衍生物电化学性能官能化氧化膦光物理凝胶渗透色谱法聚合物结构

Ultra-power-efficient heterogeneous Ⅲ–Ⅴ/Si MOSCAP(de-)interleavers for DWDM optical links

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Photonics Research 2022年第2期10卷 I0009-I0021页

作者： Stanley Cheung Geza Kurczveil Yingtao Hu Mingye Fu Yuan Yuan Di Liang Raymond G.Beausoleil hewlett packard Labs Hewlett Packard EnterpriseMilpitasCalifornia 95035USA

We discuss the design and demonstration of various Ⅲ–Ⅴ/Si asymmetric Mach–Zehnder interferometer(AMZI)and ring-assisted AMZI(de-)interleavers operating at O-band wavelengths with 65 GHz channel spacing. The wafer-bonded Ⅲ–Ⅴ/Si metal-oxide-semiconductor capacitor(MOSCAP) structure facilitates ultra-low-power phase tuning on a heterogeneous platform that allows for complete monolithic transceiver photonic *** second-and third-order MOSCAP AMZI(de-)interleavers exhibit cross-talk(XT) levels down to -22 dB and -32 dB with tuning powers of 83.0 nW and 53.0 nW, respectively. The one-, two-, and three-ring-assisted MOSCAP AMZI(de-)interleavers have XT levels down to -27 dB,-22 dB, and-20 dB for tuning powers of 10.0 nW, 7220.0 nW, and 33.6 nW, respectively. The leakage current density is measured to be in the range of 1.6–27 μA∕cm^(2). To the best of our knowledge, we have demonstrated for the first time, athermal Ⅲ–Ⅴ/Si MOSCAP(de-)interleavers with the lowest XT and reconfiguration power consumption on a silicon platform.

关键词： tuning power interferometer

Dynamic Analysis of the Biped Ice-skater Robot of Passive Wheel Type

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Journal of Shanghai Jiaotong university(Science) 2008年第1期13卷 122-128页

作者：徐子力吕恬生田华徐振华宋立博 School of Mechanical Engineering Shanghai Jiaotong University hewlett-packard Technology Shanghai Co.Ltd.

A new passive wheel type of biped ice-skater robot (BISR) subjected to nonholonomic constraints was presented on the basis of ice-skating principle. Its motion principle and construction were discussed. After the model was simplified and the coordinate systems were established, the motion differential equations of the robot were obtained with the generalized Lagrange-Maggi equation when the nonholonomic constraints existed. Actual examples were given and the result was simulated on computer.

关键词：动态分析法机器人自动化技术计算机技术

A new method of complicated folded fabric modeling

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Journal of Harbin Institute of Technology(New Series) 2012年第2期19卷 43-46页

作者：程涵余莉殷柱伟 College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics Test Center of Expertise Hewlett-Packard Company

In order to resolve the complicated folded fabric modeling problem and establish the high quality finite element model for fabric working simulation in aviation or aerospace area,the Fluid Structure Interaction(FSI) method based on Arbitrary Lagrangian Eulerian(ALE) coupling theory was applied for modeling in this *** expanded three-dimensional fabric model(a special airbag) was divided into several *** the folded state of each was calculated based on this numerical *** last,the completely folded finite element model was *** method can effectively simulate the complicated and natural folds,and the quality of model is very high which can greatly improve the success rate of fabric working process *** method also can be guidance for other kinds of folded fabric modeling.

关键词： fabric fold ALE FSI inflatable structure