公开(公告)号：US20120249232A1

公开(公告)日：2012-10-04

申请号：US13428374

申请日：2012-03-23

申请人： Taizou TATSUMI ,  Keiji TANAKA ,  Sosaku SAWADA

发明人： Taizou TATSUMI ,  Keiji TANAKA ,  Sosaku SAWADA

IPC分类号： H03F3/60

CPC分类号： H03F3/45089 ,  H03F3/45475 ,  H03F3/605 ,  H03F2203/45138 ,  H03F2203/45392 ,  H03F2203/45612

摘要： A traveling wave amplifier (TWA) primarily for driving a semiconductor optical device is disclosed. The TWA of an embodiment provides a plurality of differential amplifiers of the first type and an additional differential amplifier of the second type, where are they are connected between the input and the output of the TWA. The differential amplifiers of the first type provide a first delay from the input to the output, while, the differential amplifier of the second type provide a second delay longer than the first delay between the input and the output of the TWA.

摘要翻译： 公开了主要用于驱动半导体光学器件的行波放大器（TWA）。 实施例的TWA提供第一类型的多个差分放大器和第二类型的附加差分放大器，它们连接在TWA的输入和输出之间。 第一类型的差分放大器提供从输入到输出的第一延迟，而第二类型的差分放大器提供比TWA的输入和输出之间的第一延迟更长的第二延迟。

公开(公告)号：US20100215379A1

公开(公告)日：2010-08-26

申请号：US12773253

申请日：2010-05-04

申请人： Keiji TANAKA

发明人： Keiji TANAKA

IPC分类号： H04B10/04 ,  H01S3/10

CPC分类号： H01S5/06832 ,  H01S5/0427 ,  H01S5/06804 ,  H01S5/06812

摘要： The present invention provides an auto-power control (APC) circuit and a method to stabilize the extinction ratio of an optical output from a laser diode (LD) in an optical transmitter. The APC circuit according to the invention includes two feedback loops for the modulation IM and the bias current IB each having variable loop gain. The extinction ratio of the optical output from the LD is kept constant by setting the ratio of the loop gains of respective APC circuits to be ER−1.

摘要翻译： 本发明提供一种自动功率控制（APC）电路和稳定来自光发射机中的激光二极管（LD）的光输出的消光比的方法。 根据本发明的APC电路包括用于调制IM和偏置电流IB的两个反馈回路，每个具有可变的环路增益。 通过将各个APC电路的环路增益的比率设置为ER-1，LD的光输出的消光比保持恒定。

公开(公告)号：US20130070795A1

公开(公告)日：2013-03-21

申请号：US13615086

申请日：2012-09-13

申请人： Tomoko IKAGAWA ,  Keiji TANAKA

发明人： Tomoko IKAGAWA ,  Keiji TANAKA

IPC分类号： H01S5/06

CPC分类号： H01S5/0687 ,  H01S5/02415 ,  H01S5/0265 ,  H01S5/0612 ,  H01S5/0617 ,  H01S5/06256 ,  H01S5/06258 ,  H01S5/06804 ,  H01S5/0683 ,  H01S5/1209 ,  H01S5/1212

摘要： The method to change the emission wavelength of a tunable LD is disclosed. In an ordinary state, the method monitors conditions not only relating to determine the emission wavelength but conditions independent of the emission wavelength by an ordinary A/D-C implemented within the controller. Responding to an instruction to switch the emission wavelength, the controller only monitors the former conditions affecting the determination of the emission wavelength. The sampling rate of the ordinary A/D-C is equivalently enhanced without installing an additional A/D-C.

摘要翻译： 公开了改变可调谐LD的发射波长的方法。 在普通状态下，该方法通过在控制器内实现的普通A / D-C来监视不仅与发射波长确定但与发射波长无关的条件。 响应切换发射波长的指令，控制器仅监测影响发射波长确定的前一种情况。 普通A / D-C的采样率在不安装附加A / D-C的情况下等效增强。

公开(公告)号：US20120249241A1

公开(公告)日：2012-10-04

申请号：US13075474

申请日：2011-03-30

申请人： Akihiro MOTO ,  Keiji TANAKA

发明人： Akihiro MOTO ,  Keiji TANAKA

IPC分类号： H03F3/45

CPC分类号： H03F3/087 ,  H03F2200/411 ,  H03F2203/45528

摘要： A trans-impedance amplifier (TIA) for a light-receiving circuit is disclosed where the TIA reduces the power consumption as suppressing the degradation of the signal quality in high frequency regions. The TIA comprises a primary core, a dummy core, and a differential amplifier that receives each output of two cores in the differential mode. Two cores have an arrangement substantially same to each other except that the power consumption thereof is smaller in the dummy core. Because the output impedance of two cores becomes substantially equal, the scattering parameter of the common mode to the differential mode at the output of the primary core becomes small enough.

摘要翻译： 公开了一种用于光接收电路的跨阻放大器（TIA），其中TIA在抑制高频区域中的信号质量劣化的情况下降低了功耗。 TIA包括在差分模式下接收两个核心的每个输出的初级核心，虚拟核心和差分放大器。 两个芯具有彼此基本相同的布置，除了在虚拟芯中的功耗较小。 因为两个核的输出阻抗变得基本相等，所以在初级核的输出处的共模到差分模的散射参数变得足够小。

公开(公告)号：US20120113999A1

公开(公告)日：2012-05-10

申请号：US13290235

申请日：2011-11-07

申请人： Keiji TANAKA

发明人： Keiji TANAKA

IPC分类号： H01S3/10

CPC分类号： H01S5/06213 ,  H01S5/0427

摘要： A driver circuit for an LD is disclosed. The circuit includes a decision unit, an offset adjustor, and an amplifier each having the differential configuration in an embodiment. The decision unit decides and generates a signal LOS that distinguishes the existence/absence of the input signal. The offset adjustor, depending on the signal from the decision unit, adds/compensate the offset thereof. The amplifier, whose output are pulled up to the power supply Vcc through an inductor. Because the output of the offset adjustor compensates the offset thereof during the absence of the input signal, the output of the amplifier does not cause overshoot or undershoot.

摘要翻译： 公开了一种用于LD的驱动电路。 该电路包括一个判定单元，一个偏移调整器和一个在实施例中具有差分配置的放大器。 决定单元决定并生成区分输入信号的存在/不存在的信号LOS。 取决于来自判定单元的信号的偏移调整器对其偏移进行补偿/补偿。 放大器的输出通过电感上拉到电源Vcc。 由于偏移调整器的输出在输入信号不存在时补偿其偏移，所以放大器的输出不会引起过冲或下冲。

公开(公告)号：US20110164636A1

公开(公告)日：2011-07-07

申请号：US12984219

申请日：2011-01-04

申请人： Keiji TANAKA

发明人： Keiji TANAKA

IPC分类号： H01S3/00 ,  G05F5/00

CPC分类号： H01S5/0428

摘要： An LD driver is disclosed, which improves the rising and falling times of the driving current for the LD. The LD driver includes an inverting amplifier, an emitter follower connected in down stream of the inverting amplifier, a driving transistor driven by the emitter follower, and a current-mirror circuit connected in series to the inverting amplifier. The mirror current generated from the current flowing in the inverting amplifier is provided to the output of the emitter follower served for discharging the input capacitance of the driving transistor.

摘要翻译： 公开了LD驱动器，其改善了LD的驱动电流的上升和下降时间。 LD驱动器包括反相放大器，连接在反相放大器下游的射极跟随器，由射极跟随器驱动的驱动晶体管和与反相放大器串联连接的电流镜电路。 从在反相放大器中流动的电流产生的镜电流被提供给用于对驱动晶体管的输入电容进行放电的射极跟随器的输出端。

公开(公告)号：US20120106981A1

公开(公告)日：2012-05-03

申请号：US13282131

申请日：2011-10-26

申请人： Akihiro MOTO ,  Keiji TANAKA

发明人： Akihiro MOTO ,  Keiji TANAKA

IPC分类号： H04B10/04 ,  H01S3/10

CPC分类号： H01S5/0428 ,  H01S5/06216 ,  H01S5/06226 ,  H01S5/0683 ,  H03K17/60 ,  H03K17/6871

摘要： An LD-Driver with the push-pull arrangement is disclosed. The driver includes the high side driver driven by the positive phase signal and the low side driver driven by the negative phase signal. When the positive phase signal is in HIGH, the high side driver becomes ON and the LD driver provides additional current to the bias current for the LD; while, when the negative phase signal is in HIGH, the low side driver becomes ON and the LD driver extracts a portion of the bias current for the LD.

摘要翻译： 公开了具有推挽装置的LD驱动器。 驱动器包括由正相信号驱动的高侧驱动器和由负相位信号驱动的低侧驱动器。 当正相信号为高电平时，高侧驱动器变为ON，LD驱动器为LD的偏置电流提供额外的电流; 而当负相位信号为高电平时，低侧驱动器变为ON，LD驱动器提取LD的偏置电流的一部分。

公开(公告)号：US20110019706A1

公开(公告)日：2011-01-27

申请号：US12508045

申请日：2009-07-23

申请人： Akihiro MOTO ,  Keiji TANAKA

发明人： Akihiro MOTO ,  Keiji TANAKA

IPC分类号： H01S3/00

CPC分类号： H01S5/06808 ,  H01S5/0427 ,  H01S5/06804 ,  H01S5/06832

摘要： A driver circuit for the laser diode is disclosed. The driver circuit has the shunt configuration with a switching transistor connected in parallel to the laser diode to shunt the current flowing in the laser diode. In the present invention, the bias for the switching transistor is varied as the operating temperature of the laser diode. In addition, the gate bias for the switching transistor is compensated for the temperature dependence of the switching transistor.

摘要翻译： 公开了一种用于激光二极管的驱动电路。 驱动器电路具有并联配置，其中开关晶体管并联连接到激光二极管以分流在激光二极管中流动的电流。 在本发明中，开关晶体管的偏置随着激光二极管的工作温度而变化。 此外，开关晶体管的栅极偏置被补偿了开关晶体管的温度依赖性。

公开(公告)号：US20100183318A1

公开(公告)日：2010-07-22

申请号：US12689827

申请日：2010-01-19

申请人： Keiji TANAKA

发明人： Keiji TANAKA

IPC分类号： H04B10/04 ,  H01S3/10

CPC分类号： H04B10/504 ,  H01S5/042

摘要： An LD-Driver with a back termination circuit is disclosed. The back termination circuit of the invention provides a transistor as an active device, a current source to provide a bias current to the transistor, and a resistor as a passive element that couples the transmission lines carrying a differential signal thereon. Because the transistor shows a differential resistance of several tens of ohms by providing only a few milli-amperes, the output impedance of the LD-Driver may be substantially matched with the characteristic impedance of the transmission line with lesser additional power consumption.

摘要翻译： 公开了具有背面端接电路的LD驱动器。 本发明的背面终端电路提供了作为有源器件的晶体管，向晶体管提供偏置电流的电流源以及耦合在其上承载差分信号的传输线的无源元件的电阻器。 由于晶体管通过仅提供几毫安来显示几十欧姆的差分电阻，所以LD驱动器的输出阻抗可以与传输线的特性阻抗基本上匹配，具有较小的额外功耗。