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    Pn junction optical modulating device having a buffer layer with small energy gap
    2.
    发明授权
    Pn junction optical modulating device having a buffer layer with small energy gap 失效
    具有具有小能隙的缓冲层的Pn结光调制装置

    公开(公告)号：US4991921A

    公开(公告)日：1991-02-12

    申请号：US442521

    申请日：1989-11-27

    申请人： Masatoshi Suzuki ,  Hideaki Tanaka ,  Shigeyuki Akiba ,  Yuichi Matsushima

    发明人： Masatoshi Suzuki ,  Hideaki Tanaka ,  Shigeyuki Akiba ,  Yuichi Matsushima

    IPC分类号： G02F1/015 ,  G02F1/025

    CPC分类号： G02F1/025 ,  G02F2001/0157

    摘要： An optical modulating device is disclosed which has, on a substrate directly or via a lower cladding layer, an optical waveguide layer, an upper cladding layer of a refractive index smaller than that of the optical waveguide layer and a pair of electrodes for applying an electric field across the substrate and the upper cladding layer and in which the absorption coefficient for incident light of a fixed intensity incident to the optical waveguide layer is varied by the electric field applied across the pair of electrodes to perform the modulation of the light and the modulated light is emitted from a light emitting end face of the optical waveguide layer. In accordance with the present invention, a pn junction is formed in the upper cladding layer and at least one buffer layer of an energy gap smaller than that of the upper cladding layer but larger than that of the optical waveguide layer is interposed between the upper cladding layer and the optical waveguide layer.

    摘要翻译： 公开了一种光学调制装置，其在衬底上直接或经由下包层，光波导层，折射率小于光波导层的折射率的上包层和用于施加电的一对电极 并且其中入射到光波导层的固定强度的入射光的吸收系数由施加在该对电极上的电场而变化，以执行光的调制和被调制的 光从光波导层的发光端面发射。 根据本发明，在上部包层中形成pn结，并且至少一个能量间隙的缓冲层比上部包覆层的能隙小，但是比光波导层大的缓冲层插入在上部包层 层和光波导层。

    Optical short pulse generating device
    4.
    发明授权
    Optical short pulse generating device 失效
    光短脉冲发生装置

    公开(公告)号：US5434693A

    公开(公告)日：1995-07-18

    申请号：US213928

    申请日：1994-03-16

    申请人： Hideaki Tanaka ,  Satoru Takagi ,  Masatoshi Suzuki ,  Yuichi Matsushima

    发明人： Hideaki Tanaka ,  Satoru Takagi ,  Masatoshi Suzuki ,  Yuichi Matsushima

    IPC分类号： G02F1/01 ,  G02F1/015 ,  H04B10/25 ,  H04B10/2507 ,  H04B10/508 ,  H04B10/54 ,  H04B10/588 ,  H04B10/80 ,  H04B10/04

    CPC分类号： H04B10/50 ,  G02F1/0121 ,  G02F1/015 ,  G02F2001/0157 ,  G02F2203/26 ,  G02F2203/54

    摘要： An optical short pulse generating device is disclosed, in which semiconductor laser light of a fixed intensity is launched into a first semiconductor electroabsorption optical modulator which is driven by a 0V or forward bias voltage and a sinusoidal voltage, and the output light from the first optical modulator is launched into a second electroabsorption optical modulator to which is applied a bias voltage and a sinusoidal voltage having delayed from the said sinusoidal voltage for a period of time corresponding to the phase reversal thereof, whereby it is possible to generate optical short pulses of a repetition frequency twice higher than the oscillation frequency of a sinusoidal voltage generator.

    摘要翻译： 公开了一种光学短脉冲发生装置，其中将固定强度的半导体激光发射到由0V或正向偏压和正弦电压驱动的第一半导体电吸收光调制器中，并且来自第一光学器件的输出光 调制器被发射到第二电吸收光学调制器中，在该第二电吸收光学调制器中施加偏压和正弦电压，该偏压和正弦电压具有与所述正弦电压相比延迟一段与其相反相对应的时间，由此可以产生 重复频率比正弦电压发生器的振荡频率高两倍。

    Optical modulator
    5.
    发明授权
    Optical modulator 失效
    光调制器

    公开(公告)号：US5359679A

    公开(公告)日：1994-10-25

    申请号：US72986

    申请日：1993-06-04

    申请人： Hideaki Tanaka ,  Masatoshi Suzuki ,  Yuichi Matsushima

    发明人： Hideaki Tanaka ,  Masatoshi Suzuki ,  Yuichi Matsushima

    IPC分类号： G02B6/12 ,  G02F1/015 ,  G02F1/017 ,  G02F1/025 ,  G02B6/10

    CPC分类号： B82Y20/00 ,  G02B6/12004 ,  G02F1/025 ,  G02F1/01708 ,  G02F2001/0157

    摘要： An optical modulator in which waveguide regions are disposed at opposite ends of a modulation region to reduce the capacitance of the device and prevent pn junctions from exposure to air. On an n-side electrode there are laminated a substrate, an n-type clad layer and an optical modulation waveguide layer. A modulation region lies at the center of the optical modulation waveguide layer along the direction of travel of light, and two waveguide regions are disposed at opposite ends of the modulation region, respectively. On the optical modulation waveguide layer which constitutes the modulation region there are laminated a non-doped layer, a p-type clad layer and a p-side electrode, and a semi-insulating semiconductor is formed on the optical modulation waveguide layer which forms the two waveguide regions.

    摘要翻译： 一种光调制器，其中波导区域设置在调制区域的相对端，以减小器件的电容并防止pn结暴露于空气。 在n侧电极上层压有基板，n型覆盖层和光调制波导层。 调制区域沿着光的行进方向位于光调制波导层的中心，并且两个波导区域分别设置在调制区域的相对端。 在构成调制区域的光调制波导层上层叠有非掺杂层，p型覆盖层和p侧电极，在形成光电调制波导层的光调制波导层上形成半绝缘半导体 两个波导区域。

    Optical device
    6.
    发明授权
    Optical device 失效
    光学装置

    公开(公告)号：US5729378A

    公开(公告)日：1998-03-17

    申请号：US742400

    申请日：1996-11-04

    申请人： Hideaki Tanaka ,  Yuichi Matsushima

    发明人： Hideaki Tanaka ,  Yuichi Matsushima

    IPC分类号： G02F1/015 ,  G02F1/03 ,  G02F1/035

    CPC分类号： G02F1/0356 ,  G02F1/0344 ,  G02F2201/127

    摘要： An optical device includes a semiconductor optical modulator element (46) which is connected to an end of a signal line (42) in form of a microstrip high-frequency line and whose other electrode is connected to a ground electrode (48) by a bonding wire (50). The signal line (42) includes first and second line portions (42a, 42b). The first line portion (42a) nearer to the entrance of a high-frequency signal has a width W1 determined to adjust its characteristic impedance to 50.OMEGA. and a length L1 equal to an integer multiple of 1/4 of its own guide wavelength. The second line portion (42b) has a width W2 determined to adjust its impedance to an intermediate value between the impedance of the optical modulator element 46 and the impedance of the first line portion (42a), and a length L2 equal to an integer multiple of 1/4 of its own guide wavelength.

    摘要翻译： 光学装置包括半导体光调制元件（46），其以微带高频线的形式连接到信号线（42）的端部，并且其另一电极通过接合连接到接地电极（48） 电线（50）。 信号线（42）包括第一和第二线部分（42a，42b）。 更靠近高频信号入口的第一线部分（42a）具有确定的宽度W1，以将其特性阻抗调整到50欧姆，长度L1等于+ E的整数倍， 它自己的指南波长。 第二线部分（42b）具有确定为将其阻抗调节到光调制器元件46的阻抗和第一线部分（42a）的阻抗之间的中间值的宽度W2，以及等于整数倍的长度L2 的+ E，fra 1/4 + EE的引导波长。

    Optical waveform shaping device for peforming waveform equalization and timing synchronization
    7.
    发明授权
    Optical waveform shaping device for peforming waveform equalization and timing synchronization 失效
    用于波形均衡和定时同步的波形整形装置

    公开(公告)号：US5401957A

    公开(公告)日：1995-03-28

    申请号：US215887

    申请日：1994-03-21

    申请人： Masatoshi Suzuki ,  Noboru Edagawa ,  Hideaki Tanaka ,  Shu Yamamoto ,  Yuichi Matsushima

    发明人： Masatoshi Suzuki ,  Noboru Edagawa ,  Hideaki Tanaka ,  Shu Yamamoto ,  Yuichi Matsushima

    IPC分类号： H01S5/06 ,  G02B6/12 ,  G02F1/015 ,  H04B10/07 ,  H04B10/2507 ,  H01J5/16

    CPC分类号： H04B10/299

    摘要： To perform waveform shaping, retiming and amplification of the transmitted pulse signal of a binary PCM fiber optic communication employing an optical pulse signal which has a pulse duty factor within 1 with respect to a time slot, an optical waveform shaping device is proposed in which the optical pulse signal is branched by an optical branch circuit into two optical signals. The one transmitted optical signal passes through a photodetector, a band-pass filter for extracting the fundamental frequency component of the signal, an amplifier and a delay circuit, so that the signal is converted to a sinusoidal voltage synchronized with the optical pulse signal. The other optical signal passes through a semiconductor electrical absorption type optical modulator which is driven by the sinusoidal voltage and a DC voltage, so that the width of a gate waveform is changed by controlling the amplitude of the sinusoidal voltage and the DC voltage.

    摘要翻译： 为了对采用相对于时隙的脉冲占空比为1的脉冲信号的二进制PCM光纤通信的发送脉冲信号进行波形整形，重新定时和放大，提出了一种光波形整形装置，其中 光脉冲信号由光分支电路分支成两个光信号。 一个发送的光信号通过光电检测器，用于提取信号的基频分量的带通滤波器，放大器和延迟电路，使得信号被转换成与光脉冲信号同步的正弦电压。 另一个光信号通过由正弦电压和直流电压驱动的半导体吸电型光调制器，从而通过控制正弦电压和直流电压的幅度来改变门波形的宽度。

    Image forming apparatus and gradation correction method with density unevenness detection
    9.
    发明授权
    Image forming apparatus and gradation correction method with density unevenness detection 有权
    具有密度不均匀检测的图像形成装置和灰度校正方法

    公开(公告)号：US08797600B2

    公开(公告)日：2014-08-05

    申请号：US13455070

    申请日：2012-04-24

    申请人： Takashi Harashima ,  Hideaki Tanaka ,  Katsuyuki Hirata ,  Toru Yamaguchi ,  Takaaki Kooriya

    发明人： Takashi Harashima ,  Hideaki Tanaka ,  Katsuyuki Hirata ,  Toru Yamaguchi ,  Takaaki Kooriya

    IPC分类号： H04N1/40 ,  G03G15/00 ,  H04N1/60

    CPC分类号： H04N1/60 ,  G03G15/5058

    摘要： Image forming apparatus (100) creates a toner pattern on intermediate transfer belt (11) as a preprocessing of gradation correction, and calculates a cycle at which density unevenness is largest. Then, a toner image for gradation correction is formed so as to cancel cyclic unevenness at a cycle at which the largest density unevenness occurs. As a result of this, it becomes possible to suppress the deterioration of density detection accuracy and perform a highly accurate gradation correction even if density unevenness of any cycle occurs.

    摘要翻译： 图像形成装置（100）在中间转印带（11）上形成调色剂图案作为灰度校正的预处理，并计算浓度不均匀度最大的循环。 然后，形成用于灰度校正的调色剂图像，以便在发生最大浓度不均匀的循环中消除循环不匀。 结果，即使发生任何周期的浓度不均匀，也可以抑制密度检测精度的劣化，并且执行高精度的灰度校正。