公开(公告)号：US20130188910A1

公开(公告)日：2013-07-25

申请号：US13878295

申请日：2011-09-22

申请人： Masatoshi Tokushima ,  Shigeru Nakamura

发明人： Masatoshi Tokushima ,  Shigeru Nakamura

IPC分类号： G02B6/26 ,  B29D11/00

CPC分类号： G02B6/268 ,  B29D11/00663 ,  G02B6/1228 ,  G02B6/305

摘要： Disclosed is an optical conversion element capable of highly efficient optical coupling between a silicon waveguide and a general single-mode optical fiber only by butt-coupling without requiring anti-reflective coating. One embodiment is an optical conversion element that includes a waveguide structure and converts a mode field of guided light and is characterized in that at least a dual core is included, an innermost core of the dual core is a silicon inverse tapered thin wire core, a first outer core is a forward tapered ridge core having a ridge structure formed of an oxide film with only width of the ridge core changing. The first outer core is positioned on a narrow width side of the innermost core.

摘要翻译： 公开了一种光转换元件，其能够仅在通过对接耦合而不需要抗反射涂层的情况下，在硅波导和通用单模光纤之间进行高效的光耦合。 一个实施例是一种光转换元件，其包括波导结构并转换导向的模场，其特征在于至少包括双核，双芯的最内芯是硅逆锥形细线芯， 第一外芯是具有由仅具有脊芯宽度变化的氧化膜形成的脊结构的前锥形脊芯。 第一外芯位于最内芯的窄宽侧。

公开(公告)号：US08873906B2

公开(公告)日：2014-10-28

申请号：US13878295

申请日：2011-09-22

申请人： Masatoshi Tokushima ,  Shigeru Nakamura

发明人： Masatoshi Tokushima ,  Shigeru Nakamura

IPC分类号： G02B6/26 ,  B29D11/00 ,  G02B6/30 ,  G02B6/122

CPC分类号： G02B6/268 ,  B29D11/00663 ,  G02B6/1228 ,  G02B6/305

摘要： Disclosed is an optical conversion element capable of highly efficient optical coupling between a silicon waveguide and a general single-mode optical fiber only by butt-coupling without requiring anti-reflective coating. One embodiment is an optical conversion element that includes a waveguide structure and converts a mode field of guided light and is characterized in that at least a dual core is included, an innermost core of the dual core is a silicon inverse tapered thin wire core, a first outer core is a forward tapered ridge core having a ridge structure formed of an oxide film with only width of the ridge core changing. The first outer core is positioned on a narrow width side of the innermost core.

摘要翻译： 公开了一种光转换元件，其能够仅在通过对接耦合而不需要抗反射涂层的情况下，在硅波导和通用单模光纤之间进行高效的光耦合。 一个实施例是包括波导结构并转换导光模场的光转换元件，其特征在于，至少包括双核，双芯的最内芯是硅逆锥形细线芯， 第一外芯是具有由仅具有脊芯宽度变化的氧化膜形成的脊结构的前锥形脊芯。 第一外芯位于最内芯的窄宽侧。

公开(公告)号：US20110255826A1

公开(公告)日：2011-10-20

申请号：US13141362

申请日：2009-12-25

申请人： Masatoshi Tokushima

发明人： Masatoshi Tokushima

IPC分类号： G02B6/26

CPC分类号： G02B6/1225 ,  B82Y20/00 ,  G02B6/12007 ,  G02B6/29353 ,  G02B6/29355 ,  G02F1/011 ,  G02F1/0147 ,  G02F1/225 ,  G02F1/3132 ,  G02F2202/32

摘要： An optical switch is constituted of a wavelength filter and a control device. The wavelength filter includes a first waveguide exhibiting a transmission band of a predetermined basic mode and a second waveguide, arranged in at least one location of the first waveguide, exhibiting a transmission band with a cutoff frequency corresponding to a finite value included in the transmission band of the basic mode. A pair of optical couplers constituting a Mach-Zehnder interferometer is connected to opposite ends of a filter unit including the first waveguide and the second waveguide. When a plurality of wavelength filters is cascaded, these wavelength filters differ from each other in terms of the cutoff frequency of the second waveguide. The control device changes the cutoff frequency of the second waveguide within the transmission band of the first waveguide, thus adjusting the filtering band of the wavelength filter.

摘要翻译： 光开关由波长滤波器和控制装置构成。 波长滤波器包括布置在第一波导的至少一个位置的呈现预定基本模式的传输频带的第一波导和第二波导，其具有对应于包括在传输频带中的有限值的截止频率的传输频带 的基本模式。 构成马赫 - 策德尔干涉仪的一对光耦合器连接到包括第一波导和第二波导的滤波器单元的相对端。 当多个波长滤波器级联时，这些波长滤波器在第二波导的截止频率方面彼此不同。 控制装置改变第一波导的传输频带内的第二波导的截止频率，从而调整波长滤波器的滤波频带。

公开(公告)号：US07263251B2

公开(公告)日：2007-08-28

申请号：US11181722

申请日：2005-07-15

申请人： Masayuki Shirane ,  Masatoshi Tokushima

发明人： Masayuki Shirane ,  Masatoshi Tokushima

IPC分类号： G02B6/26 ,  G02B6/42

CPC分类号： G02F1/025 ,  B82Y20/00 ,  G02B6/1225 ,  G02F2202/32 ,  G02F2203/48

摘要： The present invention provides an optical switch having a photonic crystal structure. An optical switch of the invention has a slab optical waveguide structure whose core (35) has a two-dimensional photonic crystal structure where two or more media (33, 34) with different refractive indices are alternately and regularly arranged in a two-dimensional manner. The photonic crystal structure comprises: a line-defect waveguide; and means for altering the refractive index of the line-defect waveguide.

摘要翻译： 本发明提供一种具有光子晶体结构的光开关。 本发明的光开关具有平板光波导结构，其芯（35）具有二维光子晶体结构，其中具有不同折射率的两个或多个介质（33,34）以二维方式交替地和规则地排列 。 光子晶体结构包括：线缺陷波导; 以及用于改变线缺陷波导的折射率的装置。

公开(公告)号：US06621644B2

公开(公告)日：2003-09-16

申请号：US10212231

申请日：2002-08-06

申请人： Masatoshi Tokushima

发明人： Masatoshi Tokushima

IPC分类号： G02B300

CPC分类号： G02B6/12007 ,  G02B3/00

摘要： An optical wavelength demultiplexer includes an optical lens, a first-side waveguide and a plurality of second-side waveguide. The lens has a wave number distribution-surface having a section where an angular frequency is constant, and said section having a shape which generally represents at least a part of an ellipse or a circle; a medium allowing group-velocity directions toward an inside of the section to allow said medium to exhibit a lens effect; a finite thickness defined by a distance between two parallel planarized surfaces of the medium; a first focusing point at an inside position of the lens; and a second focusing point at an outside position of the lens. The first-side waveguide is positioned for incidence of a wavelength-multiplexed optical signal into the lens. The plurality of second-side waveguide is so aligned that terminals thereof are positioned at respective focusing points of respectively different-wavelength components included in the wavelength-multiplexed optical signal.

公开(公告)号：US06466360B2

公开(公告)日：2002-10-15

申请号：US10011444

申请日：2001-12-04

申请人： Masatoshi Tokushima

发明人： Masatoshi Tokushima

IPC分类号： G02F100

CPC分类号： G02B6/1225 ,  B82Y20/00

摘要： A photonic crystal comprises a plurality of elongated elements formed of a first dielectric material and arranged in a two-dimensional periodic honeycomb lattice. A second dielectric material surrounds the elongated elements and extending between them. The second dielectric material defines between the elongated elements a plurality of spaces filled with a third dielectric material. The first dielectric material has permittivity that is greater than permittivity of the second dielectric material and permittivity of the third dielectric material.

摘要翻译： 光子晶体包括由第一电介质材料形成并且布置在二维周期性蜂窝晶格中的多个细长元件。 第二电介质材料围绕细长元件并在它们之间延伸。 第二电介质材料在细长元件之间限定填充有第三电介质材料的多个空间。 第一电介质材料的介电常数大于第二电介质材料的介电常数和第三绝缘材料的介电常数。

公开(公告)号：US06084258A

公开(公告)日：2000-07-04

申请号：US876987

申请日：1997-06-16

申请人： Masatoshi Tokushima

发明人： Masatoshi Tokushima

IPC分类号： H01L29/812 ,  H01L21/338 ,  H01L29/80 ,  H01L29/76 ,  H01L31/112

CPC分类号： H01L29/66863 ,  H01L29/812

摘要： A MESFET has a metallic laminate including WSi.sub.x, Ti, Pt and Au films and implementing gate, source and drain electrodes of the MESFET and interconnects therefor. The substrate of the MESFET is formed of a substrate body, a first semiconductor layer made of n.sup.+ -GaAs doped with Si at a concentration of 2.times.10.sup.18 atoms/cm.sup.3 and a second semiconductor layer made of n.sup.+ -InGaAs doped with Si at a concentration of 1.times.10.sup.19 atoms/cm.sup.3. The source and drain electrodes contact the second semiconductor layer in an ohmic contact while the gate electrode contacts the first semiconductor layer in a Schottky contact through a hole formed in the second semiconductor layer. A reduced number of steps in manufacture of the MESFET can be obtained, thereby reducing fabrication costs of the MESFET.

摘要翻译： MESFET具有包括WSix，Ti，Pt和Au膜的金属层压板，并且实现了MESFET的栅极，源极和漏极以及互连。 MESFET的衬底由衬底体，由掺杂浓度为2×1018原子/ cm3的Si的n + -GaAs制成的第一半导体层和由掺杂浓度为1×1019的Si的n + -InGaAs制成的第二半导体层形成 原子/ cm3。 源电极和漏电极以欧姆接触接触第二半导体层，同时栅极通过形成在第二半导体层中的孔以肖特基接触接触第一半导体层。 可以获得MESFET的制造步骤减少，从而降低MESFET的制造成本。

公开(公告)号：US08478088B2

公开(公告)日：2013-07-02

申请号：US12919465

申请日：2009-01-26

申请人： Masatoshi Tokushima

发明人： Masatoshi Tokushima

IPC分类号： G02B6/26

CPC分类号： G02F1/3136 ,  B82Y20/00 ,  G02B6/12007 ,  G02B6/1225 ,  G02F2001/212 ,  G02F2202/32

摘要： The object is to provide an optical switch capable of efficient operation and a manufacturing method thereof. The optical switch according to the present invention is a Mach-Zehnder interferometer type optical switch composed of a line defect waveguide of a photonic crystal. Further, the optical switch according to the present invention includes two directional couplers 20 and 23, and two paths of waveguides 30 and 32 therebetween. Furthermore, between the two paths, group velocity of guided light differs in the first path waveguide 20 and the second path waveguide 32.

摘要翻译： 本发明的目的是提供一种能够有效操作的光开关及其制造方法。 根据本发明的光开关是由光子晶体的线缺陷波导构成的马赫 - 曾德干涉仪型光开关。 此外，根据本发明的光开关包括两个定向耦合器20和23，以及它们之间的两个波导管30和32。 此外，在两条路径之间，引导光的组速度在第一路径波导20和第二路径波导32中不同。

公开(公告)号：US20120195565A1

公开(公告)日：2012-08-02

申请号：US13443385

申请日：2012-04-10

申请人： Masatoshi Tokushima

发明人： Masatoshi Tokushima

IPC分类号： G02B6/10

CPC分类号： G02B6/1225 ,  B82Y20/00 ,  G02F2201/06 ,  G02F2201/20 ,  G02F2202/32 ,  G02F2203/055

摘要： Disclosed is an optical delay element that makes use of a line-defect waveguide of a photonic crystal, in which long optical delay time and small group speed dispersion are rendered compatible with each other and in which waveform distortion that might otherwise be produced in processing an ultra-high speed signal is eliminated. Two line-defect waveguides 5 and 11, having different pillar diameters and group velocity dispersions of opposite signs, are interconnected by a line-defect waveguide 8, the pillar diameters of which are gradually varied from one 5 of the line-defect waveguides to the other line-defect waveguide 11, such as to compensate for group speed dispersion as well as to maintain an optical delay effect.

摘要翻译： 公开了一种光延迟元件，其利用光子晶体的线缺陷波导，其中长的光延迟时间和小群速度色散彼此兼容，并且其中在处理中可能产生的波形失真 消除了超高速信号。 具有不同柱直径和相反符号的群速度分散的两条线缺陷波导5和11通过线缺陷波导8相互连接，其直径从线缺陷波导的5个逐渐变化到 其他线路缺陷波导11，例如补偿组速度色散以及保持光学延迟效果。

公开(公告)号：US08170383B2

公开(公告)日：2012-05-01

申请号：US12517100

申请日：2007-11-30

申请人： Masatoshi Tokushima

发明人： Masatoshi Tokushima

IPC分类号： G02B6/12 ,  G02B6/26 ,  G02B6/42

CPC分类号： G02B6/1228 ,  G02B6/136 ,  G02B2006/12061

摘要： An optical converter comprises: a first waveguide, a second waveguide, and a tapered waveguide arranged between both the waveguides, wherein heights of a core of the first waveguide and a core of the second waveguide are different; both ends in a direction of wave guiding of a core of the tapered waveguide are respectively connected to the core of the first waveguide and the core of the second waveguide; cross-sectional shapes and refractive indexes of cores of two waveguides that are connected change continuously or in a stepwise manner at each connection part; and a cross-sectional shape and refractive index of the core of the tapered waveguide change continuously or in a stepwise manner along a direction of wave guiding.

摘要翻译： 光转换器包括：布置在两个波导之间的第一波导，第二波导和锥形波导，其中第一波导的芯和第二波导的芯的高度不同; 锥形波导的芯的波导方向的两端分别连接到第一波导的芯和第二波导的芯; 所连接的两个波导的芯的横截面形状和折射率在每个连接部分处连续地或逐步地改变; 并且锥形波导的芯的横截面形状和折射率沿着波导方向连续地或逐步地改变。