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1. 发明专利

JP2010165708A Semiconductor laser 审中-公开
标题翻译：半导体激光器
公开(公告)号：JP2010165708A
公开(公告)日：2010-07-29
申请号：JP2009004279
申请日：2009-01-13
申请人： Nippon Telegr & Teleph Corp , Ntt Electornics Corp , Nttエレクトロニクス株式会社 , 日本電信電話株式会社
发明人： TAKESHITA TATSUYA , TADOKORO TAKASHI , OHASHI HIROMI , HIRONO TAKUO
IPC分类号： H01S5/12
摘要： PROBLEM TO BE SOLVED: To provide a semiconductor laser that can further improve a wide modulation bandwidth without applying no compression strain to a quantum well layer of an active layer.
SOLUTION: The ridge waveguide type DFB laser 10 includes: a substrate 11; a first SCH layer 14a formed on the substrate 11; an active layer 15 formed on the first SCH layer 14a and having a quantum well layer 15a and a barrier layer 15b; a second SCH layer 14b formed on the active layer 15; a guide layer 16 formed on the second SCH layer 14b; a clad layer 17 formed on the guide layer 16; and a cap layer 18 formed on the clad layer 17. The thickness of the quantum well layer 15a is 10-25 nm, and the guide layer 16 has a diffraction grid 16a corresponding to 1.31 μm in the wavelength of the wavelength bandwidth of the second quantum level of the quantum well layer 15a.
COPYRIGHT: (C)2010,JPO&INPIT
摘要翻译：要解决的问题：提供可以进一步改善宽调制带宽而不对活性层的量子阱层不施加压缩应变的半导体激光器。解决方案：脊波导型DFB激光器10包括：基板11; 形成在基板11上的第一SCH层14a; 形成在第一SCH层14a上并具有量子阱层15a和势垒层15b的有源层15; 形成在有源层15上的第二SCH层14b; 形成在第二SCH层14b上的引导层16; 形成在引导层16上的覆盖层17; 以及形成在包层17上的覆盖层18.量子阱层15a的厚度为10〜25nm，引导层16的波长带宽的波长对应于1.31μm的衍射栅极16a 量子阱层15a的量子电平。版权所有（C）2010，JPO＆INPIT

2. 发明专利

JP2014085533A Semiconductor optical modulation element 有权
标题翻译：半导体光学调制元件
公开(公告)号：JP2014085533A
公开(公告)日：2014-05-12
申请号：JP2012234741
申请日：2012-10-24
申请人： Nippon Telegr & Teleph Corp , 日本電信電話株式会社 , Ntt Electornics Corp , Nttエレクトロニクス株式会社
发明人： OGISO YOSHIHIRO , KAMITOKU MASAKI , IGA RYUZO , ARAI MASAKAZU , SATO TOMONARI , HIRONO TAKUO
IPC分类号： G02F1/025
摘要： PROBLEM TO BE SOLVED: To provide an n-SI-n-type heterostructure semiconductor optical modulation element capable of reducing electrical and optical loss of a semiconductor and allowing high-speed optical modulation.SOLUTION: In order to achieve high speed optical modulation by reducing electrical and optical loss and a high quality optical modulation signal, an optical modulation region includes an n-SI-n-type heterostructure formed by sandwiching with n-type cladding layers a semi-insulating (SI) core layer having an electron density and the density of an electron trapping dopant set so that a voltage drop is efficiently generated near the centre of the SI core layer, in a range where an ohmic value of 1×10Ω cm or more is secured. This structure confines propagation light near the centre of the SI layer.
摘要翻译：要解决的问题：提供能够减少半导体的电和光损耗并允许高速光调制的n-SI-n型异质结构半导体光调制元件。解决方案：为了通过减少来实现高速光调制光损耗和高质量的光调制信号，光调制区域包括通过与n型覆层夹着具有电子密度的半绝缘（SI）芯层形成的n-SI-n型异质结构，电子捕获掺杂剂的密度设定，使得在SI核心层的中心附近有效地产生电压降，其范围为欧姆值1×10＆OHgr; cm以上。这种结构将传播光限制在SI层中心附近。

3. 发明专利

JP2004341644A Method, and program for simulating electromagnetic field, and program recording medium 有权
公开(公告)号：JP2004341644A
公开(公告)日：2004-12-02
申请号：JP2003135002
申请日：2003-05-13
申请人： Nippon Telegr & Teleph Corp , 日本電信電話株式会社
发明人： HIRONO TAKUO , YOSHIKUNI YUZO
IPC分类号： G01R29/08 , G06F17/13 , G06F17/50 , G06F19/00
摘要： PROBLEM TO BE SOLVED: To provide an electromagnetic field simulation method for simulating with high precision an electromagnetic field component to be propagated on a discretized grid shape plane when a boundary is not in parallel with either of mutually orthogonal grid axes when grid shape discretization on a two-dimensional plane concerning the two-dimensional plane having the straight boundary wherein the dielectric constant of a medium is spatially and non-continuously changed, and also to provide an electromagnetic field simulation program, and a program recording medium. SOLUTION: Each of three kinds of grid points having different electromagnetic components to be assigned are arranged at equal interval, so as to constitute a discretized plane (Yee grid). The dielectric constant which satisfies a prescribed relation formula is assigned to each grid point positioned in the neighborhood of the boundary among the grid points to which the electromagnetic component is assigned. COPYRIGHT: (C)2005,JPO&NCIPI

4. 发明专利

JP2004271744A Absorption type semiconductor optical modulator 审中-公开
公开(公告)号：JP2004271744A
公开(公告)日：2004-09-30
申请号：JP2003060488
申请日：2003-03-06
申请人： Nippon Telegr & Teleph Corp , 日本電信電話株式会社
发明人： YAMANAKA TAKAYUKI , FUKANO HIDEKI , SAITO TADASHI , HIRONO TAKUO
IPC分类号： G02F1/017
摘要： PROBLEM TO BE SOLVED: To provide an absorption type semiconductor optical modulator capable of effectively removing a microwave loss which has been a factor to obstruct high speed operation. SOLUTION: The absorption type semiconductor optical modulator is provided with a semiconductor core 23 having an absorption edge wavelength shorter than the wavelength of an optical signal and electrodes 3A and 3B for applying voltage for making the semiconductor core 23 absorb the optical signal by moving the absorption edge wavelength of the semiconductor core to a longer wavelength side when voltage is applied. A semiconductor p-clad layer 25 existing at an upper part of the semiconductor core 23 and having p-type conductivity consists of a multilayered structure wherein a plurality of layers 251, 252 and 253 having doping concentrations different from each other are layered. In the doping concentration distribution in the multilayered structure, the p-clad layer 252 of the center part has a doping concentration lower than the doping concentrations of the p-clad layers 251 and 253 on the outer sides and ≤1×10 17 cm -3 doping concentration. COPYRIGHT: (C)2004,JPO&NCIPI

5. 发明专利

JP2003004784A Two-dimensional electromagnetic-field simulation method 有权
标题翻译：二维电磁场仿真方法
公开(公告)号：JP2003004784A
公开(公告)日：2003-01-08
申请号：JP2001189190
申请日：2001-06-22
申请人： Nippon Telegr & Teleph Corp , 日本電信電話株式会社
发明人： HIRONO TAKUO , YOSHIKUNI YUZO
IPC分类号： G01R29/08 , G06F17/50 , G06F19/00
摘要： PROBLEM TO BE SOLVED: To provide a two-dimensional electromagnetic-field simulation method, in which a change in terms of time in a TM-mode electromagnetic field is calculated with secondary accuracy, when two mediums of different permittivities come into contact while one straight line tilted at 45 deg. with reference to Yee lattice axis is used as a boundary. SOLUTION: The two-dimensional electromagnetic-field simulation method is constituted, in such a way that a magnetic-field component in z-direction perpendicular to a plane is allocated to a lattice point of a type 1, that an electric field component in the y-direction and permittivity are allocated to a lattice point of type 2, that an electric-field component in x-direction and a permittivity are allocated to a lattice point of type 3, that changes in time in the electric-field component and the magnetic-field component are found by time-domain difference method and that, at this time, εi2 and εi1 which satisfy (εi1 +εi2 )/2=[(1+δ)ε1 +(1-δ)ε2 ]/2 and (1/εi1 +1/εi2 )/2=[(1+δ)/ε1 +(1-δ)/ε2 ]2 as permittivities are allocated to first proximity lattice points 6a, 6b and second proximity lattice points 7a, 7b.
摘要翻译：要解决的问题：为了提供二维电磁场模拟方法，其中以二次精度计算TM模式电磁场中的时间变化，当两个不同介电常数的介质接触时，一个直线倾斜45度。参考Yee格轴作为边界。解决方案：二维电磁场模拟方法是以垂直于平面的z方向的磁场分量分配给类型1的晶格点的方式构成的， y方向和介电常数被分配给类型2的晶格点，将x方向上的电场分量和介电常数分配给类型3的晶格点，电场分量中的时间变化和通过时域差法求出磁场分量，此时，满足（εi1+εi2）/ 2 = [（1 +δ）ε1+（1-δ）ε2] / 2的εi2和εi1，（1 /εi1+ 1 /εi2）/ 2 = [（1 +δ）/ε1+（1-δ）/ε2] 2作为介电常数分配给第一接近晶格点6a，6b和第二接近晶格点7a，7b 。

6. 发明专利

JP2003270464A Reflector for optical waveguide 审中-公开
标题翻译：光波导反射器
公开(公告)号：JP2003270464A
公开(公告)日：2003-09-25
申请号：JP2002067533
申请日：2002-03-12
申请人： Nippon Telegr & Teleph Corp , 日本電信電話株式会社
发明人： HIRONO TAKUO , YOSHIKUNI YUZO
IPC分类号： G02B6/122 , G02B6/13
摘要： PROBLEM TO BE SOLVED: To provide a reflector for optical waveguide which varies the propagation direction of an optical signal by 180 degrees and has a high refractivity. SOLUTION: In the reflector for optical waveguide, an input waveguide 11 is connected to the intersection (b) of a line of a multimode interference region 12 and a center line, the multimode interference region 12 has a width in the vertical direction with respect to the center line which is twice or larger than the width of a fundamental mode visual field 16 of the input waveguide 11, and includes two reflection faces 13a and 13b which pass a point (a) on the center line which is located at a distance of 3/8 of a coupling length measured from the intersection (b) and have an angle of 45° with respect to the center line in the direction of the intersection. COPYRIGHT: (C)2003,JPO
摘要翻译：要解决的问题：提供一种光波导的反射器，其将光信号的传播方向改变180度并具有高折射率。解决方案：在光波导的反射器中，输入波导11连接到多模干涉区域12和中心线的交点（b），多模干涉区域12在垂直方向上具有宽度相对于输入波导11的基模视场16的宽度的两倍以上的中心线，并且包括通过中心线上的点（a）的两个反射面13a，13b，位于距离交叉点（b）测量的耦合长度的3/8的距离，并且在相交方向上相对于中心线具有45°的角度。版权所有（C）2003，JPO

7. 发明专利

JP2004062747A Electromagnetic field simulation method. electromagnetic field simulation program, and computer readable recording medium recorded with the program 有权
标题翻译：电磁场仿真方法。电磁场仿真程序和程序记录的计算机可读记录介质
公开(公告)号：JP2004062747A
公开(公告)日：2004-02-26
申请号：JP2002223139
申请日：2002-07-31
申请人： Nippon Telegr & Teleph Corp , 日本電信電話株式会社
发明人： HIRONO TAKUO , YOSHIKUNI YUZO
IPC分类号： G01R29/08 , G06F17/13 , G06F17/50
摘要： PROBLEM TO BE SOLVED: To provide an electromagnetic field simulation method capable of simulating an electromagnetic field of a highly accurate TM mode in a two-dimensional plane where a dielectric constant consists of two media that discontinuously change and to provide an electromagnetic field simulation program and a computer readable recording medium recorded with the program. SOLUTION: When the two media with different dielectric constants are in contact with each other with one straight line as a boundary in a plane and an electromagnetic field composed of the TM mode exists, a plane where three types of lattice points with different electromagnetic field that are allocated to one another are arranged at equal intervals and digitized is constructed as a virtual plane equivalent to the plane. Dielectric constants satisfying a prescribed relational expression are respectively given to a lattice point located near the boundary among the lattice points to which electrical field components are allocated, to calculate a change in an electromagnetic field corresponding to digitized time change. COPYRIGHT: (C)2004,JPO
摘要翻译：要解决的问题：提供一种电磁场模拟方法，其能够模拟二维平面中的高精度TM模式的电磁场，其中介电常数由不连续变化的两种介质组成并提供电磁场模拟程序和记录有程序的计算机可读记录介质。解决方案：当具有不同介电常数的两种介质以一条直线作为平面中的边界彼此接触并且存在由TM模式组成的电磁场时，具有三种不同格子点的平面分配给彼此的电磁场以相等的间隔布置，并且数字化被构造为与平面相当的虚拟平面。分别将满足规定的关系式的介电常数赋予位于分配有电场分量的格子点之间的边界附近的格子点，以计算对应于数字化时间变化的电磁场的变化。版权所有（C）2004，JPO

8. 发明专利

JP2003006554A Two-dimensional electromagnetic field simulation method 有权
标题翻译：二维电磁场仿真方法
公开(公告)号：JP2003006554A
公开(公告)日：2003-01-10
申请号：JP2001184971
申请日：2001-06-19
申请人： Nippon Telegr & Teleph Corp , 日本電信電話株式会社
发明人： HIRONO TAKUO , YOSHIKUNI YUZO
IPC分类号： G01R29/08 , G06F17/10 , G06F17/13 , G06F17/50 , G06F19/00
摘要： PROBLEM TO BE SOLVED: To provide a two-dimensional electromagnetic field simulation method with which a two-dimensional TE mode electromagnetic field can be highly accurately calculated when the two areas of different dielectric constants are in contact with one straight line as a boundary. SOLUTION: In the two-dimensional electromagnetic field simulation method, when a medium with the dielectric constant ε1 and the medium with the dielectric constant ε2 are in contact with one straight line as the boundary within one plane and the two-dimensional TE mode electromagnetic field is present, a two-dimensional lattice is arranged within the plane and an arithmetic operation by a time area difference method is performed by using a physical quantity allocated to each lattice point. To the closest lattice point 5, a first close lattice point 6 and a second close lattice point 7, εi2 , εi1 and εi3 satisfying (εi1 +εi2 +εi3 )/3=[(1+2δ/3)ε1 +(1-2δ/3)ε2 ]/2 and 12(εi3 -εi1 )=(13-6δ ) (ε2 -ε1 ) are respectively allocated as dielectric constants.
摘要翻译：要解决的问题：提供一种二维电磁场模拟方法，当两个不同介电常数的区域以一条直线作为边界接触时，可以高精度地计算二维TE模式电磁场。解决方案：在二维电磁场模拟方法中，当介质常数ε1介质与介质常数ε2介质接触一个直线作为一个平面内的边界，二维TE模式电磁场存在时，在平面内布置二维格子，并且通过使用分配给每个格点的物理量来执行通过时域差方法的算术运算。对于最接近的格子点5，满足（εi1+εi2+εi3）/ 3 = [（1 +2δ/ 3）ε1+（1-）]的第一关闭格子点6和第二接近晶格点7，εi2，εi1和εi3， 2δ/ 3）ε2] / 2和12（εi3-εi1）=（13-6δ2）（ε2-ε1）分别作为介电常数。

9. 发明专利

JPH11272717A Electromagnetic field simulation method 失效
标题翻译：电磁场仿真方法
公开(公告)号：JPH11272717A
公开(公告)日：1999-10-08
申请号：JP6889998
申请日：1998-03-18
申请人： Nippon Telegr & Teleph Corp , 日本電信電話株式会社
发明人： HIRONO TAKUO , LUI WAYNE , YOKOYAMA KIYOYUKI
IPC分类号： G06F17/50 , G06F17/00 , G06F19/00
摘要： PROBLEM TO BE SOLVED: To improve the accuracy of the simulation of the secular change of an electromagnetic field by indicating calculation from the value of the optional time step of a variable for describing the state of the electromagnetic field to the value of the next time step as a canonical variable and turning a calculation mesh used for discretizing to an equilateral triangle.
SOLUTION: Calculation algorithm for indicating calculation from the value of the optional time step of the variable for describing the state of the electromagnetic field to the value of the next time step by the canonical variable is used. Also, at the time of producing the calculation algorithm, a finite difference method is used and a plane mesh for which a grid point within an xy plane for discretizing required for difference is the equilateral triangle is used. There, a coordinate system for which unit vectors (u) and (v) provided with the opening angle of 60° are basic vectors is adopted. By using the plane mesh of the equilateral triangle, for the grid point in the equilateral triangle shape, the number of closest points is 1.5 times compared to the grid point in a square shape of a conventional time area difference method and the isotropy of the plane is reflected for that.
COPYRIGHT: (C)1999,JPO
摘要翻译：要解决的问题：通过从用于描述电磁场的状态的变量的可选时间步长的值到下一个时间步长的值来指示计算来提高电磁场的长期变化的模拟的精度作为规范变量，并将用于离散到等边三角形的计算网格。解决方案：使用用于通过规范变量将用于描述电磁场状态的变量的可选时间步长值与下一个时间步长的值进行计算的计算算法。另外，在生成计算算法时，使用有限差分法，并且使用在xy平面内用于差分所需的离散化的网格点的平面网格是等边三角形。在那里，单位矢量（u）和（v）设置有60度的开启角度的坐标系。是采用基本向量。通过使用等边三角形的平面网格，对于等边三角形形状的网格点，最接近的点数与传统时域差法的方形网格点相比是1.5倍，平面的各向同性反映了这一点。

10. 发明专利

JP2005251821A Semiconductor laser and its manufacturing method 审中-公开
标题翻译：半导体激光器及其制造方法
公开(公告)号：JP2005251821A
公开(公告)日：2005-09-15
申请号：JP2004057094
申请日：2004-03-02
申请人： Nippon Telegr & Teleph Corp , 日本電信電話株式会社
发明人： YUDA MASAHIRO , HIRONO TAKUO
IPC分类号： H01L21/22 , H01L21/265 , H01S5/22
摘要： PROBLEM TO BE SOLVED: To provide a high-output semiconductor laser having long-term reliability, and to provide its manufacturing method.
SOLUTION: In the semiconductor laser 100, where an n-type AlGaAs clad layer 102, a laser active layer 103, a p-type AlGaAs clad layer 104, and a p-type GaAs contact layer 105, are formed in layers on an n-type GaAs substrate 101 and the clad layer 104 is etched to have a ridge stripe shape, consisting of a center ridge part 104a and a planar part 104b, a region 104c is formed at a part of the sidewall of the ridge part 104a and at a part of the planar part 104b by selective diffusion of n-type dopant, in order to suppress spreading of injected current.
COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：提供具有长期可靠性的高输出半导体激光器，并提供其制造方法。解决方案：在半导体激光器100中，形成n型AlGaAs覆盖层102，激光器活性层103，p型AlGaAs覆盖层104和p型GaAs接触层105 在n型GaAs衬底101上，并且包覆层104被蚀刻成具有由中心脊部分104a和平面部分104b组成的脊条形状，区域104c形成在脊部分的侧壁的一部分 104a，并且通过n型掺杂剂的选择性扩散在平面部分104b的一部分处，以抑制注入电流的扩展。版权所有（C）2005，JPO＆NCIPI

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