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1. 发明申请

US20090238226A1 DRIVER CIRCUIT FOR SEMICONDUCTOR LASER DIODE DRIVEN IN DIFFERENTIAL MODE 有权
标题翻译：以不同模式驱动的半导体激光二极管的驱动电路
公开(公告)号：US20090238226A1
公开(公告)日：2009-09-24
申请号：US12402671
申请日：2009-03-12
申请人： Akihiro MOTO , Katsumi UESAKA
发明人： Akihiro MOTO , Katsumi UESAKA
IPC分类号： H01S3/00
CPC分类号： H01S5/042 , H01S5/0427 , H01S5/0683
摘要： A driver circuit for a semiconductor laser diode (LD) is disclosed, in which the driver circuit drives the LD in the differential mode and lowers the power consumption thereof. The driver circuit includes a differential unit to provide the modulation current to the LD, a voltage converter to provide a positive power supply to the differential unit, a detector to detect the common mode voltage of the differential outputs of the unit, and a comparing unit to control the voltage converter dynamically such that the output common mode voltage is set in a preset reference level.
摘要翻译：公开了一种用于半导体激光二极管（LD）的驱动电路，其中驱动电路以差分模式驱动LD并降低其功耗。驱动器电路包括向LD提供调制电流的差分单元，向差分单元提供正电源的电压转换器，用于检测单元的差分输出的共模电压的检测器，以及比较单元以动态地控制电压转换器，使得输出共模电压被设置在预设的参考电平。

2. 发明申请

US20120094402A1 METHOD TO MANUFACTURE SEMICONDUCTOR DEVICE WITH OPTICAL GRATING 有权
标题翻译：用光刻技术制造半导体器件的方法
公开(公告)号：US20120094402A1
公开(公告)日：2012-04-19
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： H01L21/66
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。

3. 发明申请

US20100172657A1 OPTICAL RECEIVER WITH TRANS-IMPEDANCE RESPONDING IN BIT-BY-BIT TO INPUT SIGNAL 有权
标题翻译：光纤接收器在逐位转移到输入信号的情况下具有跨阻抗
公开(公告)号：US20100172657A1
公开(公告)日：2010-07-08
申请号：US12651632
申请日：2010-01-04
申请人： Katsumi UESAKA
发明人： Katsumi UESAKA
IPC分类号： H04B10/06
CPC分类号： H04B10/693 , H03F1/083 , H03F3/08
摘要： An optical receiver implemented with a pre-amplifier with an additional trans-impedance able to respond to the input signal in bit-by-bit is disclosed. The optical receiver provides a photodiode to convert an optical signal into a photocurrent, a trans-impedance amplifier to convert the photocurrent to a voltage signal, and an additional trans-impedance circuit able to respond instantaneously to the voltage signal. The additional trans-impedance includes a FET whose gate is fully fixedly biased and the source thereof receives the voltage signal. The FET may bypass the current flowing in the intrinsic trans-impedance instantaneously.
摘要翻译：公开了一种使用具有能够逐比特地响应输入信号的额外的跨阻器的前置放大器实现的光学接收器。光接收器提供光电二极管以将光信号转换成光电流，将反射阻抗放大器转换成电压信号的电阻，以及能够瞬时响应于电压信号的额外的跨阻抗电路。额外的跨阻抗包括一个FET，其门完全固定偏置，其源极接收电压信号。 FET可以瞬时旁路在本征反阻抗中流动的电流。

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