公开(公告)号：US20110194572A1

公开(公告)日：2011-08-11

申请号：US13015678

申请日：2011-01-28

Applicant: HIROYUKI YAMAZAKI ,  HIROHITO YAMADA

Inventor： HIROYUKI YAMAZAKI ,  HIROHITO YAMADA

IPC: H01S3/30 ,  G02B6/12

CPC classification number: G02B6/125 ,  G02F1/011 ,  G02F2202/105 ,  G02F2203/15 ,  H01S5/02248 ,  H01S5/0654 ,  H01S5/142

Abstract: A composite optical waveguide 1 includes a first optical waveguide 9 comprising a silica-based core and a second optical waveguide 11 comprising an Si-based core. The second optical waveguide 11 is joined to the first optical waveguide 9. The length of the first optical waveguide 9 corresponds to a permissible propagation loss of the second optical waveguide 11. The second optical waveguide 11 includes a sharply curved portion 13 having a radius smaller than the minimum bend radius of the first optical waveguide 9.

Abstract translation: 复合光波导1包括第一光波导9，其包括二氧化硅基磁芯和第二光波导11，第二光波导11包括Si基磁芯。 第二光波导11与第一光波导9接合。第一光波导9的长度对应于第二光波导11的允许传播损耗。第二光波导11包括半径较小的锐曲部13 比第一光波导9的最小弯曲半径大。

公开(公告)号：US07715665B2

公开(公告)日：2010-05-11

申请号：US12032392

申请日：2008-02-15

Applicant: Jun Ushida ,  Hirohito Yamada

Inventor： Jun Ushida ,  Hirohito Yamada

IPC: G02B6/12 ,  G02B6/00 ,  G02B6/26 ,  G02B6/28 ,  G02B6/30 ,  G02B6/02 ,  G02B6/10 ,  G02B1/10 ,  G02F1/00 ,  H01S3/00

CPC classification number: G02F1/365 ,  G02F1/3515 ,  G02F2202/32

Abstract: In an optical circuit including multi-dimensional photonic crystals, in which the optical circuit has a structure (33), such as a light emitting member or a light receiving member, having a natural resonance frequency, another structure (34) having a natural resonance frequency slightly differing from the natural resonance frequency of the structure (33) is arranged in the vicinity of the structure (33) to control the directivity of localization and propagation of an electromagnetic field, light emission and light reception in a spatial region including the above structures in the multi-dimensional photonic crystals, in order to permit functional operations to be realized.

Abstract translation: 在包括多维光子晶体的光电路中，其中光电路具有具有天然共振频率的诸如发光部件或光接收部件的结构（33），具有天然共振的另一结构（34） 与结构（33）的固有谐振频率稍微不同的频率被布置在结构（33）附近，以控制在包括上述的空间区域中的电磁场，发光和光接收的定位和传播的方向性 多维光子晶体中的结构，以便实现功能操作。

公开(公告)号：US5394429A

公开(公告)日：1995-02-28

申请号：US144038

申请日：1993-11-01

Applicant: Hirohito Yamada ,  Tetsuro Okuda ,  Toshitaka Torikai

Inventor： Hirohito Yamada ,  Tetsuro Okuda ,  Toshitaka Torikai

IPC: H01S5/10 ,  H01S5/12 ,  H01S5/20 ,  H01S5/227 ,  H01S3/08

CPC classification number: H01S5/12 ,  H01S5/1064 ,  H01S5/1206 ,  H01S5/1215 ,  H01S5/1225 ,  H01S5/2077 ,  H01S5/2272 ,  H01S5/2277

Abstract: A distributed-feedback laser has a diffractive grating, an optical waveguide layer, and an active region. The optical waveguide layer has equivalent refractive indexes larger towards cavity end facets and smaller towards a device center portion along a cavity. The active region containing the optical waveguide layer has widths wider towards the cavity end facets and narrower towards the device center portion along the cavity. The optical waveguide layer has a uniform electric intensity distribution along the cavity to improve the linearity of current versus optical output characteristics. In another arrangement, the optical waveguide layer formed on the diffractive grating has in its compositions longer wavelengths towards the cavity end facets and shorter wavelengths towards the cavity center portion along the cavity, whereby the optical waveguide layer has a uniform optical intensity distribution along the cavity to improve the linearity of current versus optical output characteristics. The distributed-feedback laser provided is with improved analog modulation distortion characteristics.

Abstract translation: 分布反馈激光器具有衍射光栅，光波导层和有源区。 光波导层具有相对于腔端面较大的等效折射率，并且朝着沿腔的器件中心部分较小。 包含光波导层的有源区域具有朝向腔体端面更宽的宽度，并且沿着空腔朝向器件中心部分较窄。 光波导层沿着空腔具有均匀的电强度分布，以提高电流对光输出特性的线性度。 在另一种布置中，形成在衍射光栅上的光波导层在其组成中具有朝向空腔端面的较长波长和沿着空腔朝向空腔中心部分的较短波长，由此光波导层沿着空腔具有均匀的光强度分布 以提高电流对光输出特性的线性度。 提供的分布式反馈激光器具有改进的模拟调制失真特性。

公开(公告)号：US20050213905A1

公开(公告)日：2005-09-29

申请号：US11090835

申请日：2005-03-25

Applicant: Hirohito Yamada

Inventor： Hirohito Yamada

IPC: G02B6/12 ,  G02B6/122 ,  G02B6/26 ,  G02F1/365

CPC classification number: B82Y20/00 ,  G02B6/122 ,  G02B6/1225

Abstract: A nonlinear-optic waveguide device has a thin-wire optical waveguide including a core having a cross-sectional area of at most 1 μm2 and a cladding, the core and the cladding having a refractive index difference of at least 1. A light pulse introduced into the core has a peak power of at least several hundreds W and a pulse duration of at most 10 ps. The thin-wire optical waveguide has a length of about 1 cm. The nonlinear optical device, a model-locked semiconductor laser, and tunable optical filter are combined into a white pulse light source.

Abstract translation: 非线性光波导器件具有细线光波导，其包括具有至多1mum 2的横截面积的芯和包层，芯和包层的折射率差为 至少1.引入芯的光脉冲具有至少几百瓦的峰值功率和至多10ps的脉冲持续时间。 细线光波导的长度约为1cm。 非线性光学器件，模型锁定半导体激光器和可调谐滤光器组合成白色脉冲光源。

公开(公告)号：US20050089291A1

公开(公告)日：2005-04-28

申请号：US10973344

申请日：2004-10-27

Applicant: Hirohito Yamada

Inventor： Hirohito Yamada

IPC: G02B6/12 ,  G02B6/122 ,  G02B6/13 ,  G02B6/10

CPC classification number: B82Y20/00 ,  G02B6/1221 ,  G02B6/1223 ,  G02B2006/121

Abstract: A waveguide structure having a cross-sectional structure wherein Si is in the center and it is surrounded by a peripheral material, which is either SiO2 or a polymer material. The above-mentioned peripheral material functions as a cladding.

Abstract translation: 一种具有横截面结构的波导结构，其中Si在中心并且被由SiO 2或聚合物材料构成的周边材料包围。 上述周边材料用作包层。

公开(公告)号：US06631236B2

公开(公告)日：2003-10-07

申请号：US09819797

申请日：2001-03-29

Applicant: Hirohito Yamada

Inventor： Hirohito Yamada

IPC: G02B610

CPC classification number: G02B6/1225 ,  B82Y20/00

Abstract: The present invention provides a photonic crystal waveguide comprising: a substrate; a bottom cladding layer over the substrate; and a core layer over the bottom cladding layer, the core layer having a uniform distribution of holes, wherein the core layer has at least a waveguide region which is thicker than a remaining region of the core layer to cause a refractive index guide effect, or wherein the core layer has at least a waveguide region, on which a dielectric pattern is provided which has a refractive index higher than a substance in contact with a top surface of the core layer, or wherein the core layer has at least a waveguide region, and the holes except on the waveguide region are filled with an air, whilst the holes on the waveguide regions are filled with a filler material having a refractive index higher than 1.

Abstract translation: 本发明提供一种光子晶体波导，包括：基板; 衬底上的底部包层; 以及在所述下包层上方的芯层，所述芯层具有均匀的孔分布，其中所述芯层至少具有比所述芯层的剩余区域更厚的波导区域以引起折射率引导效应，或 所述芯层至少具有波导区域，在所述波导区域上设置有比与所述芯层的上表面接触的物质高的折射率的电介质图案，或者所述芯层至少具有波导区域， 并且除了波导区域之外的孔填充有空气，而波导区域上的孔填充有折射率高于1的填充材料。

公开(公告)号：US06363097B1

公开(公告)日：2002-03-26

申请号：US09157186

申请日：1998-09-18

Applicant: Richard A. Linke ,  Hirohito Yamada

Inventor： Richard A. Linke ,  Hirohito Yamada

IPC: H01S308

CPC classification number: H01S5/141 ,  G02B2006/12107 ,  H01S3/1055

Abstract: A semiconductor laser with a rewritable wavelength stabilizer which comprises a laser mirror made of a grating written into a photorefractive material, in which the oscillation wavelength of the laser diode is determined by the period of the grating. This allows the refractive index of the grating to be changed by illuminating the photorefractive material after cooling thereof to a temperature at which most of the doped impurities form DX centers. The grating can be erased by heating the photorefractive material to a temperature at which most DX centers are ionized, which erases the grating. Thereafter the photorefractive material is cooled again to a temperature at which most impurities become DX centers, and a new grating can be written in the photorefractive material. The wavelength of the semiconductor laser can be changed repeatedly by erasing and rewriting the grating therein. The laser diode is maintained and operated at a low temperature to maintain the grating semi-permanently therein while the temperature remains low.

Abstract translation: 一种具有可重写波长稳定器的半导体激光器，包括由写入光折射材料的光栅制成的激光反射镜，其中激光二极管的振荡波长由光栅的周期决定。 这允许通过在冷却之后将光折射材料照射到大部分掺杂杂质形成DX中心的温度来改变光栅的折射率。 可以通过将光折射材料加热到大多数DX中心离子化的温度来擦除光栅，从而擦除光栅。 此后，将光折射材料再次冷却至大多数杂质成为DX中心的温度，并且可以在光折射材料中写入新的光栅。 可以通过擦除并重写其中的光栅来重复地改变半导体激光器的波长。 激光二极管在低温下保持和操作，以将光栅半永久地保持在其中，同时温度保持较低。

公开(公告)号：US5828058A

公开(公告)日：1998-10-27

申请号：US856978

申请日：1997-05-15

Applicant: Hirohito Yamada

Inventor： Hirohito Yamada

IPC: G01N21/35 ,  G01M11/00 ,  G01N21/31 ,  G01N21/3504 ,  G01N21/3581 ,  H04B3/46 ,  H01J5/16

CPC classification number: G01N21/31

Abstract: Disclosed is an optical fiber remote sensing system, which has: first and second light sources which are connected to ends of branched optical fibers and emit lights with two wavelengths different from each other; one or more optical detectors which conduct a photoelectric conversion of the lights propagated through the optical fibers from the first and second light sources and generate an electromagnetic wave with a wavelength corresponding to a difference between the two different wavelengths; and a measuring means which receives the electromagnetic wave propagated through a measured substance and measures a state of the measured substance based on an optical absorption characteristic of the measured substance.

Abstract translation: 公开了一种光纤遥感系统，其具有：第一和第二光源，其连接到分支光纤的端部并发射具有彼此不同的两个波长的光; 一个或多个光检测器，其对来自第一和第二光源的光纤传播的光进行光电转换，并产生具有对应于两个不同波长之间的差的波长的电磁波; 以及测量装置，其接收通过测量物质传播的电磁波，并且基于所测量的物质的光吸收特性来测量被测物质的状态。

公开(公告)号：US5553090A

公开(公告)日：1996-09-03

申请号：US208683

申请日：1994-03-11

Applicant: Hirohito Yamada

Inventor： Hirohito Yamada

IPC: H01S5/00 ,  H01S5/34 ,  H01S3/18

CPC classification number: B82Y20/00 ,  H01S5/34 ,  H01S5/3415 ,  H01S5/3425

Abstract: A semiconductor multiquantum well structure is provided, which includes semiconductor well layers for forming quantum wells and semiconductor barrier layers for forming potential barriers each of which is arranged between adjacent two of the well layers. Each barrier layer is 7 nm or less in thickness. A number of the well layers is selected dependent upon the thickness of each barrier layer so that carriers or electrons and holes are injected into the respective quantum wells substantially uniformly. The number of the well layers is preferably 5 or more, and in the case, each barrier layer preferably ranges from 5 nm to 7 nm in thickness. A semiconductor laser having superior distortion characteristics at a high-frequency band such as 1 GHz can be provided.

Abstract translation: 提供了一种半导体多量子阱结构，其包括用于形成量子阱的半导体阱层和用于形成势垒的半导体势垒层，每个阱层布置在相邻的两个阱层之间。 每个阻挡层的厚度为7nm以下。 根据每个阻挡层的厚度来选择多个阱层，使得载流子或电子和空穴基本均匀地注入相应的量子阱中。 阱层的数量优选为5以上，在这种情况下，阻挡层的厚度优选为5nm〜7nm。 可以提供在诸如1GHz的高频带处具有优异的失真特性的半导体激光器。

公开(公告)号：US5469459A

公开(公告)日：1995-11-21

申请号：US178859

申请日：1994-01-07

Applicant: Tetsuro Okuda ,  Hirohito Yamada ,  Toshitaka Torikai

Inventor： Tetsuro Okuda ,  Hirohito Yamada ,  Toshitaka Torikai

IPC: H01S5/028 ,  H01S5/062 ,  H01S5/10 ,  H01S5/12 ,  H01S3/19

CPC classification number: H01S5/12 ,  H01S5/028 ,  H01S5/06213 ,  H01S5/1039 ,  H01S5/1225

Abstract: In a laser diode element including a front facet, a rear facet, a laser cavity formed between the front rear facets and which has a predetermined length L, coating layers coated on the front facet to provide a reflectivity smaller than 5%, and an active layer and a uniform grating having regular corrugation formed in the direction of the layer cavity and which are coupled to each other at a predetermined coupling constant K, the laser diode element is specified by a product of the predetermined coupling constant and the predetermined length L and falling within a range between 0.4 and 1.0, both inclusive.

Abstract translation: 在包括前面，后刻面的激光二极管元件，形成在前后小面之间并具有预定长度L的激光腔，涂覆在前刻面上的涂层以提供小于5％的反射率，以及活性物质 层和均匀的光栅，其具有在层腔的方向上形成的规则的波纹，并且以预定的耦合常数K彼此耦合，激光二极管元件由预定耦合常数和预定长度L的乘积指定， 在0.4到1.0之间的范围内。