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    Transmission type diffraction grating
    32.
    发明授权
    Transmission type diffraction grating 有权
    透射型衍射光栅

    公开(公告)号：US07518794B2

    公开(公告)日：2009-04-14

    申请号：US12018043

    申请日：2008-01-22

    申请人： Naoko Hikichi ,  Kenichi Nakama

    发明人： Naoko Hikichi ,  Kenichi Nakama

    IPC分类号： G02B5/18

    CPC分类号： G02B5/1866

    摘要： A transmission diffraction optical element is presented in which ridges having a roughly rectangular cross-section shape are disposed parallel to each other at a regular pitch at the surface of a substrate. Striped thin-film layers are formed on these ridges and a thin-film layer is inserted between the substrate and the ridges. The thin-film layers are arranged at a regular pitch identical to the regular pitch of the ridges and the thin-film layer does not have a periodic pattern oriented in the same direction as the periodic pattern of the ridges.

    摘要翻译： 呈现透射衍射光学元件，其中具有大致矩形横截面形状的脊以基板表面的规则间距彼此平行地设置。 在这些脊上形成带状的薄膜层，并且在衬底和脊之间插入薄膜层。 薄膜层以与脊的规则间距相同的规则间距布置，并且薄膜层不具有沿与脊的周期性图案相同的方向定向的周期性图案。

    Transmission type diffraction grating
    33.
    发明授权
    Transmission type diffraction grating 有权
    透射型衍射光栅

    公开(公告)号：US07420735B2

    公开(公告)日：2008-09-02

    申请号：US11188030

    申请日：2005-07-22

    申请人： Naoko Hikichi ,  Kenichi Nakama

    发明人： Naoko Hikichi ,  Kenichi Nakama

    IPC分类号： G02B5/18

    CPC分类号： G02B5/1866

    摘要： A transmission diffraction optical element is presented in which ridges having a roughly rectangular cross-section shape are disposed parallel to each other at a regular pitch at the surface of a substrate. Striped thin-film layers are formed on these ridges and a thin-film layer is inserted between the substrate and the ridges. The thin-film layers are arranged at a regular pitch identical to the regular pitch of the ridges and the thin-film layer does not have a periodic pattern oriented in the same direction as the periodic pattern of the ridges.

    摘要翻译： 呈现透射衍射光学元件，其中具有大致矩形横截面形状的脊以基板表面的规则间距彼此平行地设置。 在这些脊上形成带状的薄膜层，并且在衬底和脊之间插入薄膜层。 薄膜层以与脊的规则间距相同的规则间距布置，并且薄膜层不具有沿与脊的周期性图案相同的方向定向的周期性图案。

    Light-receiving element and photodetector using the same
    34.
    发明授权
    Light-receiving element and photodetector using the same 失效
    光接收元件和使用其的光电检测器

    公开(公告)号：US07372124B2

    公开(公告)日：2008-05-13

    申请号：US10959960

    申请日：2004-10-06

    申请人： Takashi Tagami ,  Kenichi Nakama

    发明人： Takashi Tagami ,  Kenichi Nakama

    IPC分类号： H01L31/00

    CPC分类号： G01J9/00 ,  G01J1/42 ,  G01J3/2803 ,  G01J3/36 ,  H01L31/02024 ,  H01L31/03046 ,  H01L31/105 ,  Y02E10/544

    摘要： A light-receiving element may easily detect the barycenter of a light intensity of light having a long-wavelength band in an optical communication. An InGaAs layer (i-type layer) and a p-type InP layer are stacked on an n-type InP substrate. Electrodes are formed on both sides of the top surface of the p-type layer, and an electrode is formed on the bottom surface of the n-type substrate. An incident light impinged upon the light-receiving element is photoelectricly-converged into a photocurrent, and the photocurrent flows in the p-type layer to the electrodes. As a result, a current is derived from each of the electrodes, the magnitude thereof being dependent on the distances from the light impinging position to respective electrodes. The barycenter of a light intensity may be calculated from the currents derived from the electrodes and a light intensity may be obtained from the summation of the currents.

    摘要翻译： 光接收元件可以容易地检测光通信中具有长波长带的光的光强度的重心。 在n型InP衬底上堆叠InGaAs层（i型层）和p型InP层。 电极形成在p型层的顶表面的两侧，并且在n型衬底的底表面上形成电极。 照射在受光元件上的入射光被光电收敛成光电流，光电流在p型层中流向电极。 结果，从每个电极导出电流，其大小取决于从光入射位置到各个电极的距离。 光强度的重心可以根据从电极导出的电流计算，并且可以从电流的总和获得光强度。

    Transmission type diffraction grating
    35.
    发明申请
    Transmission type diffraction grating 审中-公开
    透射型衍射光栅

    公开(公告)号：US20050200957A1

    公开(公告)日：2005-09-15

    申请号：US11078650

    申请日：2005-03-11

    申请人： Naoko Hikichi ,  Kenichi Nakama

    发明人： Naoko Hikichi ,  Kenichi Nakama

    IPC分类号： G02B5/18 ,  G01J3/28

    CPC分类号： G02B5/1871

    摘要： A transmission grating that provides low polarization dependent loss over a wide wave range and provides high diffraction efficiency even with a small groove pitch and high resolving power and dispersion. In a transmission grating 10, multiple parallel ridges 22 that are transparent for the wave range to be used are disposed on one side of a substrate 20 that is transparent for the wave range to be used. Parallel grooves 24 are formed at a fixed pitch a between these ridges. Light is applied from the surface of the transmission grating on which the grooves are formed and diffracted light is extracted from the substrate surface on which grooves are not formed. The groove pitch a is set to a range of 0.51 λc-1.48 λc, where λc is the central wavelength.

    摘要翻译： 一种透射光栅，其在宽波段范围内提供低偏振相关损耗，即使具有较小的沟槽间距和高分辨能力和色散，也能提供高衍射效率。 在透射光栅10中，对于要使用的波长范围透明的多个平行脊22设置在对于使用的波长范围是透明的基板20的一侧。 在这些脊之间以固定的间距a形成平行的凹槽24。 从其上形成有沟槽的透射光栅的表面施加光，并且从未形成槽的衬底表面提取衍射光。 槽间距a设定为0.51 lambdac-1.48 lambdac的范围，其中lambdac是中心波长。

    Optical fiber coupling system
    36.
    发明授权
    Optical fiber coupling system 失效
    光纤耦合系统

    公开(公告)号：US06934443B2

    公开(公告)日：2005-08-23

    申请号：US10278820

    申请日：2002-10-24

    申请人： Naoko Hikichi ,  Fumitoshi Kobayashi ,  Kenichi Nakama

    发明人： Naoko Hikichi ,  Fumitoshi Kobayashi ,  Kenichi Nakama

    IPC分类号： G02B6/02 ,  C03C25/68 ,  G02B6/42 ,  G02B6/26

    CPC分类号： G02B6/4207 ,  G02B6/4203

    摘要： When an end surface of a silica optical fiber and another optical element are to be optically coupled to each other, according to the invention, the optical fiber is treated so that a core of the optical fiber is protruded from a clad of the optical fiber at an end portion of the optical fiber to form a protrusion shaped like a truncated cone or like a cone. On this occasion, the refractive index of the surrounding medium is selected to be in a range of from 1.35 to 1.60. Preferably, the area of the top surface of the truncated cone is not larger than ⅕ as large as the area of the bottom surface of the truncated cone. Further preferably, the side surface of the core protrusion is inclined at an angle of 30 degrees to 75 degrees, both inclusively, with respect to the central axis of the core.

    摘要翻译： 当二氧化硅光纤和另一个光学元件的端面彼此光学耦合时，根据本发明，光纤被处理使得光纤的芯从光纤的包层突出 光纤的端部，以形成像圆锥体或类似锥体的突起。 在这种情况下，周围介质的折射率选择在1.35〜1.60的范围内。 优选地，截头锥体的顶面的面积不大于截头圆锥体的底面的面积的1/5。 进一步优选地，芯突起的侧表面相对于芯的中心轴线包含30度至75度的角度倾斜。

    Optical demultiplexer
    39.
    发明授权
    Optical demultiplexer 失效
    光解复用器

    公开(公告)号：US06888681B2

    公开(公告)日：2005-05-03

    申请号：US10353981

    申请日：2003-01-30

    申请人： Kenichi Nakama

    发明人： Kenichi Nakama

    IPC分类号： G02B6/34 ,  G02B6/42 ,  G02B27/30 ,  G02B5/18

    CPC分类号： G02B6/2931 ,  G02B6/2938 ,  G02B6/4249

    摘要： Incident light rays (11) given from an optical fiber (10) are converted into parallel light rays (12) by a collimator lens (2). The parallel light rays (12) are demultiplexed in accordance with wavelengths by a diffraction grating (3). After the demultiplexed light rays arrive at the collimator lens (2) again, the light rays are converted into convergent light rays (14) and converged into a photo acceptance element array. Because the converging/image-forming positions of respective channels are arranged at irregular pitches in accordance with wavelengths, signals of the channels can be taken out accurately and efficiently from photo acceptance elements respectively when the photo acceptance elements are provided in the converging/image-forming positions respectively.

    摘要翻译： 由光纤（10）给出的入射光线（11）由准直透镜（2）转换为平行光线（12）。 平行光线（12）根据衍射光栅（3）的波长进行解复用。 在解复用的光线再次到达准直透镜（2）之后，光线被转换成会聚光线（14）并会聚在光接收元件阵列中。 由于各个通道的会聚/成像位置根据波长以不规则的间距排列，所以当在会聚/图像形成装置中设置光接收元件时，分别可以从照片接收元件精确而有效地取出通道的信号， 形成位置。