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Search Results: 1 - 10 of 9283 matches for " Pan Jiaoqing "
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Growth of Space Ordered 1.3μm InAs Quantum Dots on GaAs(100) Vicinal Substrates by MOCVD
Liang Song,Zhu Hongliang,Pan Jiaoqing,Wang Wei,
Liang Song
,Zhu Hongliang,Pan Jiaoqing,Wang Wei

半导体学报 , 2005,
Abstract: 用MOCVD技术在偏(1100)GaAs衬底上生长了发光波长在1.3μm的线状空间规则排列InAs量子点.光致发光实验表明,相对于正(100)衬底,偏(100)GaAs衬底上生长的InAs量子点具有更好的材料质量,光谱有更大的强度和更窄的线宽.为了得到发光波长为1.3μm的量子点,对比研究了不同In含量的InGaAs应力缓冲层(SBL)和应力盖层(SCL)的应力缓冲作用.结果表明,增加SCL中In含量能有效延伸量子点发光波长到1. 3μm,但是随着SBL中In的增加,发光波长变化不明显,并且材料质量明显下降.
Compressively Strained InGaAs/InGaAsP Quantum Well Distributed Feedback Laser at 1.74μm
Pan Jiaoqing,Wang Wei,Zhu Hongliang,Zhao Qian,Wang Baojun,Zhou Fan,and Wang Lufeng
半导体学报 , 2005,
Abstract: The compressively strained InGaAs/InGaAsP quantum well distributed feedback laser with ridge-wave-guide is fabricated at 1.74μm.It is grown by low-pressure metal organic chemical vapor deposition(MOCVD).A strain buffer layer is used to avoid indium segregation.The threshold current of the device uncoated with length of 300μm is 115mA.The maximum output power is 14mW at 100mA.A side mode suppression ratio of 35.5dB is obtained.
A high-efficiency high-power evanescently coupled UTC-photodiode

Zhang Yunxiao,Liao Zaiyi,Zhao Lingjuan,Zhu Hongliang,Pan Jiaoqing,Wang Wei,

半导体学报 , 2009,
Abstract: The effects of the multimode diluted waveguide on quantum efficiency and saturation behavior of the evanescently coupled uni-traveling carrier (UTC) photodiode structures are reported. Two kinds of evanescently coupled uni-traveling carrier photodiodes (EC-UTC-PD) were designed and characterized: one is a conventional EC-UTC-PD structure with a multimode diluted waveguide integrated with a UTC-PD; and the other is a compact EC-UTC-PD structure which fused the multimode diluted waveguide and the UTC-PD structure together. The effect of the absorption behavior of the photodiodes on the efficiency and saturation characteristics of the EC-UTC-PDs is analyzed using 3-D beam propagation method, and the results indicate that both the responsivity and saturation power of the compact EC-UTC-PD structures can be further improved by incorporating an optimized compact multimode diluted waveguide.
High-performance electroabsorption modulator

Zhang Wei,Pan Jiaoqing,Zhu Hongliang,Wang Huan,Wang Wei,

半导体学报 , 2009,
Abstract: 通过离子诱导量子阱混杂的方法制备出输入输出两端分别与无源波导集成的电吸收调制器。器件制作过程只需要两步金属汽相外延生长过程,以及传统的光刻,干法刻蚀工艺。为了提高调制速度电吸收调制器的波导长度降到100μm,这将影响到器件的消光比,因此有源区采用了内台阶量子阱结构。材料质量优异的应变补偿的InGaAsP/InGaAsP内台阶量子阱结构可以改善调制性能。这样可以同时得到较高的调制速度与较高的消光比。在本实验中,在未加终端负载的情况下电光频率响应可达22GHz,消光比可达16dB。
A Novel Optical Gate by Integration of a Photodiodeand an Electroabsorption Modulator

Liao Zaiyi,Pan Jiaoqing,Zhou Fan,Bian Jing,Zhu Hongliang,Zhao Lingjuan,Wang Wei,

半导体学报 , 2008,
Abstract: 通过在InP基上单片集成光探测器和调制器,制作了三端光逻辑门.在不同的负载电阻下,器件显示了良好的"与"门功能.对芯片进行了622MHz的动态测试;在950Ω负载条件下,只需要约7mw的控制光功率即可获得大于7dB的动态消光比.
Monolithic Integration of a Widely Tunable Laser with SOA Using Quantum-Well Intermixing

Liu Hongbo,Zhao Lingjuan,Kan Qiang,Pan Jiaoqing,Wang Lu,Zhu Hongliang,Zhou Fan,Wang Wei,

半导体学报 , 2008,
Abstract: This paper presents an SG-DBR with a monolithically integrated SOA fabricated using quantum-well intermixing (QWI) for the first time in mainland China.The wavelength tuning range covers 33nm and the output power reaches 10mW with an SOA current of 50mA.The device can work at available channels with SMSR over 35dB.
Monolithic integration of widely tunable sampled grating DBR laser with tilted semiconductor optical amplifier

Liu Yang,Ye Nan,Wang Baojun,Zhou Daibing,An Xin,Bian Jing,Pan Jiaoqing,Zhao Lingjuan,Wang Wei,

半导体学报 , 2010,
Abstract: High output powers and wide range tuning have been achieved in a sampled grating distributed Bragg reflector laser with an integrated semiconductor optical amplifier. Tilted amplifier and anti-reflection facet coating are used to suppress reflection. We have demonstrated sampled grating DBR laser with a tuning range over 38 nm, good wavelength coverage and peak output powers of more than 9 mW for all wavelengths.
A Contextual Item-Based Collaborative Filtering Technology  [PDF]
Xueqing Tan, Pan Pan
Intelligent Information Management (IIM) , 2012, DOI: 10.4236/iim.2012.43013
Abstract: This paper proposes a contextual item-based collaborative filtering technology, which is based on the traditional item-based collaborative filtering technology. In the process of the recommendation, user’s important mobile contextual information are taken into account, and the technology combines with those ratings on the items in the users’ historical contextual information who are familiar with user’s current context information in order to predict that which items will be preferred by user in his or her current context. At the end, an experiment is used to prove that the technology proposed in this paper can predict user’s preference in his or her mobile environment more accurately.
The Impact of Macro Factors on the Profitability of China’s Commercial Banks in the Decade after WTO Accession  [PDF]
Qinhua Pan, Meiling Pan
Open Journal of Social Sciences (JSS) , 2014, DOI: 10.4236/jss.2014.29011

Profitability of China’s commercial banks has increased significantly since it joined the World Trade Organization (WTO). Constantly advancing of deepening the reform and increasingly fierce of international competition make us to be concerned more about macroeconomic factors. This paper makes an empirical analysis with a panel of 10 Chinese listed banks during the period 1998- 2012 to make a study of the potential impact of external factors may bring to China’s capital market. The results confirm that macroeconomic do have a substantial influence to the earning power of commercial banks, according to which some suggestions are made at the end of the paper.

Linearization of the Liouville Equation, Multiple Splits of the Chandler Frequency, Markowitz Wobbles, and Error Analysis  [PDF]
Cheh Pan
International Journal of Geosciences (IJG) , 2012, DOI: 10.4236/ijg.2012.325095
Abstract: The rotation of the physical Earth is far more complex than the rotation of a biaxial or slightly triaxial rigid body can represent. The linearization of the Liouville equation via the Munk and MacDonal perturbation scheme has oversimplified polar excitation physics. A more conventional linearization of the Liouville equation as the generalized equation of motion for free rotation of the physical Earth reveals: 1) The reference frame is most essential, which needs to be unique and physically located in the Earth; 2) Physical angular momentum perturbation arises from motion and mass redistribution to appear as relative angular momentum in a rotating Earth, which excites polar motion and length of day variations; 3) At polar excitation, the direction of the rotation axis in space does not change besides nutation and precession around the invariant angular momentum axis, while the principal axes shift responding only to mass redistribution; 4) Two inertia changes appear simultaneously at polar excitation; one is due to mass redistribution, and the other arises from the axial near-symmetry of the perturbed Earth; 5) The Earth at polar excitation becomes slightly triaxial and axially near-symmetrical even it was originally biaxial; 6) At polar excitation, the rotation of a non-rigid Earth becomes unstable; 7) The instantaneous figure axis or mean excitation axis around which the rotation axis physically wobbles is not a principal axis; 8) In addition to amplitude excitation, the Chandler wobble possesses also multiple frequency-splits and is slow damping; 9) Secular polar drift is after the products of inertia and always associated with the Chandler wobble; both belong to polar motion; 10) The Earth will reach its stable rotation only after its rotation axis, major principal axis, and instantaneous figure axis or mean excitation axis are all completely aligned with each other to arrive at the minimum energy configuration of the system; 11) The observation of the multiple splits of the Chandler frequency is further examined by means of exact-bandwidth filtering and spectral analysis, which confirms the theoretical prediction of the linearized Liouville equation. After the removal of the Gibbs phenomenon from the polar motion spectra, Markowitz wobbles are also observed; 12) Error analysis of the ILS data demonstrates that the incoherent noises from the Wars in 1920-1945 are separable from polar motion and removable, so the ILS data are still reliable and useful for the study of the continuation of polar motion.
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