公开(公告)号：US20060197008A1

公开(公告)日：2006-09-07

申请号：US11354542

申请日：2006-02-14

申请人： Takatoshi Kato ,  Katsumi Uesaka

发明人： Takatoshi Kato ,  Katsumi Uesaka

IPC分类号： H01J40/14 ,  H01L31/00 ,  H03K17/78

CPC分类号： G02B6/30 ,  G02B6/264 ,  G02B2006/4297 ,  G02F1/3523 ,  H01L31/02161 ,  H01L31/107

摘要： The present invention provides a light-receiving device that may escape the device from the breakdown thereof and may suppress an optical loss. The light-receiving device of the invention includes a surface to sense the light and a thin film made of PbSe nano-particles, diameters of which are smaller than 20 nm. This thin film operates as an optical fuse, so the device may be escaped from the breakdown thereof. Moreover, the thin film is disposed directly onto the light-sensing surface of the device, the optical loss cause between the thin film and the sensing surface may be suppressed.

摘要翻译： 本发明提供一种光接收装置，其可以使装置从其击穿中脱离，并且可以抑制光损失。 本发明的光接收装置包括用于感测光的表面和由PbSe纳米颗粒制成的薄膜，其直径小于20nm。 该薄膜作为光学保险丝操作，因此该装置可以从其击穿中逃逸。 此外，薄膜直接设置在器件的感光表面上，可以抑制薄膜和感测表面之间的光学损耗。

公开(公告)号：US08620116B2

公开(公告)日：2013-12-31

申请号：US13346032

申请日：2012-01-09

申请人： Katsumi Uesaka ,  Tohru Watanabe

发明人： Katsumi Uesaka ,  Tohru Watanabe

IPC分类号： G02F1/01 ,  G02F1/035

CPC分类号： G02F1/0123 ,  G02F1/225

摘要： An optical modulation apparatus, including: a Mach-Zehnder optical modulator having two light waveguides, two output light waveguides, and a join-and-branch portion located therebetween; a drive circuit configured to output a modulation signal to modulation electrodes provided respectively on the two light waveguides as a differential signal, the modulation signal modulating lights propagated in the two light waveguides; a phase adjustment circuit configured to control first phase control signals to be output to phase adjustment electrodes provided respectively on the two light waveguides, and adjust phases of lights propagated in the two light waveguides; a phase shift control circuit configured to switch second phase control signals to be output to phase shift electrodes provided respectively on the two light waveguides, and change phases of the lights propagated in the two light waveguides; and a signal polarity reversal circuit configured to reverse a polarity of the differential signal.

摘要翻译： 一种光调制装置，包括：具有两个光波导的Mach-Zehnder光调制器，两个输出光波导和位于它们之间的连接和分支部分; 驱动电路，被配置为将调制信号输出到分别设置在两个光波导上的调制电极作为差分信号，调制信号调制在两个光波导中传播的光; 相位调整电路，被配置为将第一相位控制信号输出到分别设置在两个光波导上的相位调整电极，并调整在两个光波导中传播的光的相位; 相移控制电路，被配置为将要输出的第二相位控制信号切换到分别设置在两个光波导上的相移电极，并且改变在两个光波导中传播的光的相位; 以及信号极性反转电路，被配置为反转差分信号的极性。

公开(公告)号：US07358818B2

公开(公告)日：2008-04-15

申请号：US10968353

申请日：2004-10-20

申请人： Katsumi Uesaka ,  Naoki Nishiyama

发明人： Katsumi Uesaka ,  Naoki Nishiyama

IPC分类号： H03F3/08

CPC分类号： H03G3/3084 ,  H03F3/08 ,  H03F3/087

摘要： The present invention provides an optical receiver operable for optical signals each having different transmission speed. The optical receiver includes a light-receiving device, a pre-amplifier, a main amplifier, and a control circuit. The pre-amplifier, may be a trans-impedance amplifier, includes a parallel connection of a switching device and a resistor in a trans-impedance or a load element. By switching ON/OFF the switching device, the gain and the bandwidth of the pre-amplifier may be changed. By providing a filter circuit, whose cut-off frequency may be switched, in the main amplifier, the bandwidth of the optical receiver may be varied.

摘要翻译： 本发明提供一种光学接收器，可操作用于各自具有不同传输速度的光信号。 光接收器包括光接收装置，前置放大器，主放大器和控制电路。 前置放大器可以是跨阻放大器，包括开关器件和跨阻抗或负载元件中的电阻器的并联连接。 通过切换开关装置的ON / OFF，可以改变前置放大器的增益和带宽。 通过在主放大器中设置截止频率可以切换的滤波器电路，可以改变光接收器的带宽。

公开(公告)号：US20070291807A1

公开(公告)日：2007-12-20

申请号：US11808559

申请日：2007-06-11

申请人： Katsumi Uesaka

发明人： Katsumi Uesaka

IPC分类号： H01S3/00

CPC分类号： H01S5/0683 ,  H01S5/06825

摘要： The invention provides an optical transmitter that prevents the high frequency components in the driving signal from leaking to the external power supply in a wider frequency range. The transmitter provides a shun driving configuration with a switching transistor connected in parallel to the laser diode and a load transistor connected in serial to the parallel circuit of the switching transistor and the laser diode. The load transistor operates in the common base configuration, or the common gate configuration, by which the input impedance viewed from the laser diode becomes large, while, the output impedance viewed from the external power source becomes small. Thus, the high frequency components in the driving signal applied to the switching transistor can be suppresses to appear in the external power source.

摘要翻译： 本发明提供了一种防止驱动信号中的高频分量在较宽频率范围内泄漏到外部电源的光发射机。 发射器提供顺时针驱动配置，其中开关晶体管与激光二极管并联连接，负载晶体管串联连接到开关晶体管和激光二极管的并联电路。 负载晶体管工作在从激光二极管观察的输入阻抗变大的公共基极配置或公共栅极配置中，而从外部电源观察的输出阻抗变小。 因此，可以抑制施加到开关晶体管的驱动信号中的高频分量出现在外部电源中。

公开(公告)号：US20070098026A1

公开(公告)日：2007-05-03

申请号：US11583039

申请日：2006-10-19

申请人： Katsumi Uesaka ,  Keiji Tanaka

发明人： Katsumi Uesaka ,  Keiji Tanaka

IPC分类号： H01S3/13

CPC分类号： H01S5/042

摘要： The present invention is to provide a laser driver able to select configurations for the high speed application and for the lower speed and the lower power dissipation. The laser driver of the present invention provides a pair of transistors with the differential configuration whose outputs are complementary to each other, and a pair of load circuits connected between respective outputs of the paired transistor and the power supply line. Two outputs of the paired transistor are also connected to the anode and cathode of the laser diode and two load circuits each includes a switch to isolate the output of the transistor from the power supply line to vary the output impedance of the laser driver.

摘要翻译： 本发明提供一种激光驱动器，其能够选择用于高速应用和低速度以及较低功耗的配置。 本发明的激光驱动器提供一对具有彼此互补的差分配置的晶体管，以及连接在成对晶体管和电源线的各个输出端之间的一对负载电路。 成对晶体管的两个输出也连接到激光二极管的阳极和阴极，并且两个负载电路各自包括用于将晶体管的输出与电源线隔离的开关，以改变激光驱动器的输出阻抗。

公开(公告)号：US20060263100A1

公开(公告)日：2006-11-23

申请号：US11416389

申请日：2006-05-03

申请人： Katsumi Uesaka ,  Keiji Tanaka

发明人： Katsumi Uesaka ,  Keiji Tanaka

IPC分类号： H04B10/06

CPC分类号： H04B10/66 ,  H04B10/0799

摘要： The present invention provides an optical receiver able to monitor the level of the optical input signal in accurate even when the level is quite small. The optical receiver comprises a photodiode to generate a photocurrent Ipd, a current mirror circuit to reflect the photocurrent into a mirrored current Imon, a current-to-voltage converter to convert the mirrored current Imon to a voltage signal, switch to connect/cut the current mirror circuit with the current-to-voltage converter, and a correction unit for subtracting a signal when the switch is connected from a signal when the switch is cut.

摘要翻译： 本发明提供一种即使当该电平相当小时也能够准确地监视光输入信号的电平的光接收器。 光接收器包括光电二极管以产生光电流Ipd，将光电流反射成镜像电流Imon的电流镜电路，用于将镜像电流Imon转换成电压信号的电流 - 电压转换器，切换到连接/切割 具有电流 - 电压转换器的电流镜电路，以及用于当开关切断时从信号连接开关时减去信号的校正单元。

公开(公告)号：US20130136388A1

公开(公告)日：2013-05-30

申请号：US13346032

申请日：2012-01-09

申请人： Katsumi Uesaka ,  Tohru Watanabe

发明人： Katsumi Uesaka ,  Tohru Watanabe

IPC分类号： G02F1/035

CPC分类号： G02F1/0123 ,  G02F1/225

摘要： An optical modulation apparatus, including: a Mach-Zehnder optical modulator having two light waveguides, two output light waveguides, and a join-and-branch portion located therebetween; a drive circuit configured to output a modulation signal to modulation electrodes provided respectively on the two light waveguides as a differential signal, the modulation signal modulating lights propagated in the two light waveguides; a phase adjustment circuit configured to control first phase control signals to be output to phase adjustment electrodes provided respectively on the two light waveguides, and adjust phases of lights propagated in the two light waveguides; a phase shift control circuit configured to switch second phase control signals to be output to phase shift electrodes provided respectively on the two light waveguides, and change phases of the lights propagated in the two light waveguides; and a signal polarity reversal circuit configured to reverse a polarity of the differential signal.

摘要翻译： 一种光调制装置，包括：具有两个光波导的Mach-Zehnder光调制器，两个输出光波导和位于它们之间的连接和分支部分; 驱动电路，被配置为将调制信号输出到分别设置在两个光波导上的调制电极作为差分信号，调制信号调制在两个光波导中传播的光; 相位调整电路，被配置为将第一相位控制信号输出到分别设置在两个光波导上的相位调整电极，并调整在两个光波导中传播的光的相位; 相移控制电路，被配置为将要输出的第二相位控制信号切换到分别设置在两个光波导上的相移电极，并且改变在两个光波导中传播的光的相位; 以及信号极性反转电路，被配置为反转差分信号的极性。

公开(公告)号：US07912380B2

公开(公告)日：2011-03-22

申请号：US11416389

申请日：2006-05-03

申请人： Katsumi Uesaka ,  Keiji Tanaka

发明人： Katsumi Uesaka ,  Keiji Tanaka

IPC分类号： H04B10/06

CPC分类号： H04B10/66 ,  H04B10/0799

摘要： The present invention provides an optical receiver able to monitor the level of the optical input signal in accurate even when the level is quite small. The optical receiver comprises a photodiode to generate a photocurrent Ipd, a current mirror circuit to reflect the photocurrent into a mirrored current Imon, a current-to-voltage converter to convert the mirrored current Imon to a voltage signal, switch to connect/cut the current mirror circuit with the current-to-voltage converter, and a correction unit for subtracting a signal when the switch is connected from a signal when the switch is cut.

摘要翻译： 本发明提供一种即使当该电平相当小时也能够准确地监视光输入信号的电平的光接收器。 光接收器包括光电二极管以产生光电流Ipd，将光电流反射成镜像电流Imon的电流镜电路，用于将镜像电流Imon转换成电压信号的电流 - 电压转换器，切换到连接/切割 具有电流 - 电压转换器的电流镜电路，以及用于当开关切断时从信号连接开关时减去信号的校正单元。

公开(公告)号：US07492797B2

公开(公告)日：2009-02-17

申请号：US11113324

申请日：2005-04-25

申请人： Katsumi Uesaka

发明人： Katsumi Uesaka

IPC分类号： H01S3/00

CPC分类号： H01S5/0683 ,  H01S5/0427 ,  H01S5/06213

摘要： A laser driver circuit driving a laser diode to generate an optical output corresponding to an input data, and controlling the optical output based on an output current from a photodiode that detects the optical output. The output current is converted into a voltage signal, whose amplitude is detected after filtering the voltage signal by a low-pass filter. A reference signal corresponding to the input data is generated, and its amplitude is detected. A modulator for generating a modulation current regulates the amplitude of the modulation current according to the difference between the two detected amplitudes.

摘要翻译： 激光驱动电路驱动激光二极管以产生对应于输入数据的光输出，并且基于来自检测光输出的光电二极管的输出电流来控制光输出。 输出电流被转换为电压信号，其电压信号通过低通滤波器对电压信号进行滤波后检测。 产生对应于输入数据的参考信号，并检测其幅度。 用于产生调制电流的调制器根据两个检测到的幅度之间的差来调节调制电流的幅度。

公开(公告)号：US20070230526A1

公开(公告)日：2007-10-04

申请号：US11727414

申请日：2007-03-26

申请人： Akihiro Moto ,  Katsumi Uesaka

发明人： Akihiro Moto ,  Katsumi Uesaka

IPC分类号： H01S3/00

CPC分类号： H01S5/02212 ,  H01L2224/48091 ,  H01L2224/48137 ,  H01L2924/1305 ,  H01S5/02248 ,  H01S5/0427 ,  H01S5/06226 ,  H01L2924/00014 ,  H01L2924/00

摘要： The present invention is to provide a laser module stably operable with less jitter in high frequencies. The laser module of the invention provides a semiconductor laser diode and a current-shunting device that shunts the current flowing in the LD by responding the input modulation signal. A path where the current flows puts a serial circuit comprised of an inductor and a compensation circuit to compensate a ripple in the frequency response of the module. The resonance frequency of the compensation circuit corresponds to a frequency of a dip or a peak in the frequency spectrum of the module.

摘要翻译： 本发明是提供一种在高频下具有较少抖动的稳定可操作的激光模块。 本发明的激光模块提供半导体激光二极管和电流分流装置，其通过响应输入调制信号来分流在LD中流动的电流。 电流流动的路径使得由电感器和补偿电路组成的串联电路来补偿模块的频率响应中的纹波。 补偿电路的谐振频率对应于模块的频谱中的倾角或峰值的频率。