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    • 123. 发明授权
    • Non-linear optical switch
    • 非线性光开关
    • US06295402B1
    • 2001-09-25
    • US09440164
    • 1999-11-15
    • Shigeru NakamuraKazuhito Tajima
    • Shigeru NakamuraKazuhito Tajima
    • G02B600
    • G02F1/3515
    • An optical switch is provided that utilizes a signal light frequency shift due to the resonance excitation non-linear optical effect in a semiconductor material so that a high extinction ratio optical switching operation can be realized with low energy controlling light pulses. The non-linear optical waveguide 1 receives a signal light pulse of a frequency of &ohgr;1 and a controlling light pulse of a frequency of &ohgr;0 and sets the pulse width of the controlling light pulse to a value smaller than that of the signal light pulse. The optical waveguide portion of the non-linear optical waveguide 1 is formed of a non-linear optical medium of which the non-linear refractive index changes due to absorption or amplification of the controlling light. The frequency &ohgr;1 of the signal light is set to the transparent region of the non-linear optical waveguide 1. When the frequency &ohgr;0 of the controlling light is set to the absorption region of the non-linear optical waveguide 1, some of signal light pulses incident together with the controlling lights partially frequency-shift toward the high-frequency area. The optical frequency filter 2 outputs only the frequency-shifted components. This allows the optical switching operation to be realized by controlling light pulses with low energies.
    • 提供了一种光学开关,其利用由于半导体材料中的共振激励非线性光学效应引起的信号光频移,使得可以以低能量控制光脉冲实现高消光比光开关操作。 非线性光波导1接收ω1的频率的信号光脉冲和ω0的频率的控制光脉冲,并将控制光脉冲的脉冲宽度设定为小于信号光脉冲的脉冲宽度。 非线性光波导1的光波导部分由非线性光学介质形成,其非线性折射率由于控制光的吸收或放大而改变。 将信号光的频率ω1设定为非线性光波导1的透明区域。当将控制光的频率ω0设定为非线性光波导1的吸收区域时,一些信号光脉冲 事件与控制灯一起部分地频移到高频区域。 光频滤波器2仅输出频移分量。 这允许通过以低能量控制光脉冲来实现光开关操作。
    • 128. 发明授权
    • Optical information recording/reproducing system including novel
tracking system
    • 光信息记录/再现系统包括新颖的跟踪系统
    • US5408452A
    • 1995-04-18
    • US938254
    • 1992-10-13
    • Akito SakemotoToshinori SugiyamaZenji TsutsumiShigeru NakamuraMasahiro Ojima
    • Akito SakemotoToshinori SugiyamaZenji TsutsumiShigeru NakamuraMasahiro Ojima
    • G11B11/10G11B7/09G11B7/095G11B11/105G11B7/00
    • G11B7/094G11B11/10578G11B7/0903
    • An optical information recording/reproducing system is disclosed in which optical information having guide grooves for tracking and information pits beforehand provided thereon is irradiated with a main light beam for the recording/reproduction of information and a pair of subsidiary light beams for the detection of tracking and the scanning loci of the centers of the subsidiary light beams are arranged on the optical information carrier on opposite sides of the scanning locus of the center of the main light beam, respectively, first and second means for generating electric signals having their amplitudes corresponding to the respective intensities of the subsidiary light beams reflected by the optical information carrier, third means for detecting a difference in amplitude between the electric output signals of the first and second means, fourth means for detecting Ac components of the electric output signals of the first and second means to detect a difference in amplitude between the AC components, and fifth means for selecting a detection output of the third means as tracking information when the subsidiary light beams scan a region on the optical information carrier where the information pits are not provided and selecting a detection output of the fourth means as tracking information when the subsidiary light beams scan a region on the optical information carrier where the information pits are provided.
    • PCT No.PCT / JP91 / 01737 Sec。 371日期:1992年10月13日 102(e)日期1992年10月13日PCT 1991年12月19日PCT PCT。 第WO93 / 12522号公报 日期:1993年6月24日。公开了一种光信息记录/再现系统,其中具有用于跟踪的信息凹槽和预先设置的信息凹坑的光学信息被照射用于记录/再现信息的主光束和一对辅助 用于检测跟踪的光束和辅助光束的中心的扫描轨迹分别布置在主光束中心的扫描轨迹的相对侧上的光学信息载体上,第一和第二装置 电信号的幅度对应于由光信息载体反射的辅助光束的各自的强度,第三装置,用于检测第一和第二装置的电输出信号之间的幅度差;第四装置,用于检测第一和第二装置的Ac分量 第一和第二装置的电输出信号以检测a中的差异 AC分量之间的距离,以及当辅助光束扫描没有提供信息坑的光信息载体上的区域时选择第三装置的检测输出作为跟踪信息的第五装置,并且选择第四装置的检测输出 作为辅助光束扫描光信息载体上提供信息坑的区域的跟踪信息。
    • 129. 发明授权
    • Semiconductor optical waveguide type switch including light control means
    • 包括光控制装置的半导体光波导型开关
    • US5329601A
    • 1994-07-12
    • US993698
    • 1992-12-21
    • Shigeru Nakamura
    • Shigeru Nakamura
    • G02F1/025G02B6/12G02B6/122G02B6/34G02F1/01G02F1/225G02F1/313G02F1/35G02B6/26
    • G02F1/3133G02B6/122G02F1/2257G02B2006/12078G02B2006/12159G02F1/0126
    • A semiconductor waveguide type all-optical switch of a simple structure which can switch at high speed with low switching energy. A waveguide is formed within a core layer made of a semiconductor for absorbing controlling light when an electric field is applied, and a pair of electrodes are formed for applying a voltage to a waveguide part where a refractive index change is to be caused. The controlling light together with controlled light is entered in the waveguide. When a voltage is applied, Franz-Keldysh effect causes the wavelength at the optical absorption spectrum edge in the refractive index change part to shift to the long wavelength side. If light of a wavelength satisfying a predetermined condition is used as the controlling light, the controlling light is absorbed only in the refractive index change part for changing the refractive index in the part, thus the controlled light is switched. Preferably, a p-i-n structure is adopted.
    • 一种结构简单的半导体波导型全光开关,可以高速切换低开关能量。 在由用于在施加电场时吸收控制光的由半导体制成的芯层内形成波导,并且形成一对电极以向要引起折射率变化的波导部分施加电压。 控制光与可控光一起进入波导管。 当施加电压时,Franz-Keldysh效应使折射率变化部分中的光吸收光谱边缘处的波长移向长波长侧。 如果使用满足预定条件的波长的光作为控制光,则控制光仅在折射率变化部分被吸收,以改变该部分中的折射率,从而切换受控光。 优选地,采用p-i-n结构。