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1. 发明授权

US08216866B2 Method to manufacture semiconductor device with optical grating 有权
标题翻译：用光栅制造半导体器件的方法
公开(公告)号：US08216866B2
公开(公告)日：2012-07-10
申请号：US12903547
申请日：2010-10-13
申请人： Katsumi Uesaka , Kuniaki Ishihara , Yutaka Oonishi
发明人： Katsumi Uesaka , Kuniaki Ishihara , Yutaka Oonishi
IPC分类号： H01L21/00 , G01R31/26
CPC分类号： H01S5/0042 , H01S5/024 , H01S5/12 , H01S5/1231 , H01S5/2275 , H01S5/4031 , H01S2304/04
摘要： A method to manufacture an optical device with enhanced high frequency performance is disclosed. The method includes steps of: (a) forming semiconductor layers on a semiconductor substrate, (b) etching the semiconductor layers by using a mask to form a plurality of diffraction gratings, where the mask provides a plurality of periodic patterns each corresponding to respective gratings and having a specific pitch different from others, (c) forming an active layer on the etched semiconductor layers, (d) measuring a maximum optical gain of the active layer, (e) selecting one of diffraction gratings based on the measured optical gain, and (f) forming a current confinement structure aligned with the selected diffraction grating.
摘要翻译：公开了制造具有增强的高频性能的光学器件的方法。该方法包括以下步骤：（a）在半导体衬底上形成半导体层，（b）通过使用掩模蚀刻半导体层以形成多个衍射光栅，其中掩模提供多个每个对应于各个光栅的周期性图案（c）在蚀刻的半导体层上形成有源层，（d）测量有源层的最大光学增益，（e）基于所测量的光学增益来选择一个衍射光栅，和（f）形成与所选衍射光栅对准的电流限制结构。

2. 发明授权

US08620116B2 Optical modulation apparatus, method for controlling optical modulation apparatus 有权
标题翻译：光调制装置，光调制装置的控制方法
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。

3. 发明授权

US07358818B2 Optical receiver for an optical communication 有权
标题翻译：用于光通信的光接收机
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。

4. 发明申请

US20070291807A1 Optical transmitter with a shunt driving configuration and a load transistor operated in common gate mode 有权
标题翻译：具有并联驱动配置的光发射机和在共门模式下工作的负载晶体管
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。

5. 发明申请

US20070098026A1 Laser driver with selectable output impedance 有权
标题翻译：具有可选输出阻抗的激光驱动器
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。

6. 发明申请

US20060263100A1 Optical receiver 有权
标题翻译：光接收机
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。

7. 发明申请

US20130136388A1 OPTICAL MODULATION APPARATUS, METHOD FOR CONTROLLING OPTICAL MODULATION APPARATUS 有权
标题翻译：光学调制装置，控制光学调制装置的方法
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。

8. 发明授权

US07912380B2 Optical receiver 有权
标题翻译：光接收机
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。

9. 发明授权

US07492797B2 Laser driver circuit 失效
标题翻译：激光驱动电路
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。

10. 发明申请

US20070230526A1 Semiconductor laser module driven in shunt-driving configuration 审中-公开
标题翻译：半导体激光模块驱动分流驱动配置
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。

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