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Avalanche photodiodes on silicon photonics

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Journal of Semiconductors 2022年第2期43卷 11-23页

作者： Yuan Yuan Bassem Tossoun Zhihong Huang Xiaoge Zeng Geza Kurczveil Marco Fiorentino Di Liang Raymond G.Beausoleil hewlett packard Labs Hewlett Packard EnterpriseMilpitasCA 95035USA

Silicon photonics technology has drawn significant interest due to its potential for compact and high-performance photonic integrated *** Ge-or III-V material-based avalanche photodiodes integrated on silicon photonics provide ideal high sensitivity optical receivers for telecommunication ***,the last advances of monolithic and hetero-geneous avalanche photodiodes on silicon are reviewed,including different device structures and semiconductor systems.

关键词： avalanche photodiode silicon photonics photonic integrated circuit

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

Study and Development of the Biped Ice Skating Robot with Passive Wheels

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Journal of shanghai Jiaotong university(Science) 2007年第6期12卷 780-786页

作者：徐子力吕恬生田华徐振华宋立博 School of Mechanical Eng. Shanghai Jiaotong Univ. hewlett-packard Tech. shanghai co.ltd.

A new passive wheel type of biped ice-skating robot(BISR)which was able to imitate human skating motion was developed. Firstly, the characteristics of two types of human skating gait were introduced; secondly, after simplifying the kinematical model, the BISR's motion principle was presented; then the construction and control system of BISR were proposed; at last, the skating experiment of the BISR in a symmetric gait mode was conducted and some conclusions were drawn.

关键词： biped ice-skating robot(BISR) gait plan kinematics mapping control system

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

A Semantic Searching Scheme in Heterogeneous Unstructured P2P Networks

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Journal of computer Science & technology 2011年第6期26卷 925-941页

作者：黄俊成李秀琦吴杰 ACM IEEE shanghai hewlett-packard co. Ltd. Department of computer Science and Mathematics University of North Carolina at Pembroke Department of computer and Information Sciences Temple University

Semantic-based searching in peer-to-peer （P2P） networks has drawn significant attention recently. A number of semantic searching schemes, such as GES proposed by Zhu Y et al., employ search models in Information Retrieval （IR）. All these IR-based schemes use one vector to summarize semantic contents of all documents on a single node. For example, GES derives a node vector based on the IR model： VSM （Vector Space Model）. A topology adaptation algorithm and a search protocol are then designed according to the similarity between node vectors of different nodes. Although the single semantic vector is suitable when the distribution of documents in each node is uniform, it may not be efficient when the distribution is diverse. When there are many categories of documents at each node, the node vector representation may be inaccurate. We extend the idea of GES and present a new class-based semantic searching scheme （CSS） specifically designed for unstructured P2P networks with heterogeneous single-node document collection. It makes use of a state-of-the-art data clustering algorithm, online spherical k-means clustering （OSKM）, to cluster all documents on a node into several classes. Each class can be viewed as a virtual node. Virtual nodes are connected through virtual links. As a result, the class vector replaces the node vector and plays an important role in the class-based topology adaptation and search process. This makes CSS very efficient. Our simulation using the IR benchmark TREC collection demonstrates that CSS outperforms GES in terms of higher recall, higher precision, and lower search cost.

关键词： class-based search GES semantic clustering topology adaptation P2P networks

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

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