公开(公告)号：US06785477B1

公开(公告)日：2004-08-31

申请号：US09646509

申请日：2000-09-19

申请人： Toru Masuda ,  Katsuyoshi Washio ,  Taizo Yoshikawa ,  Eiji Ohue ,  Kenichi Ohhata

发明人： Toru Masuda ,  Katsuyoshi Washio ,  Taizo Yoshikawa ,  Eiji Ohue ,  Kenichi Ohhata

IPC分类号： H04B1006

CPC分类号： H04B10/6932 ,  H03F3/08 ,  H03F3/082 ,  H03F3/343 ,  H03F3/3432 ,  H03F3/345 ,  H04B10/6931

摘要： A large time constant is caused due to parasitic capacitance at an anode terminal of a photodetector of an optical receiver. Therefore, an optical receiver wherein a variable negative capacitor mainly including an NPN-type transistor operable at high speed is configured and is connected to the input terminal of a preamplifier to which the output of the photodetector is input so that parasitic capacitance caused in the photodetector and due to packaging is equivalently reduced and the fluctuation of parasitic capacitance caused due to manufacturing dispersion is also compensated is provided.

摘要翻译： 由于光接收器的光电检测器的阳极端子处的寄生电容引起大的时间常数。 因此，其中主要包括以高速工作的NPN型晶体管的可变负电容器的光接收器被配置并连接到前置放大器的输入端子，输入光电检测器的输出端，使得在光电探测器中产生的寄生电容 并且由于封装等效地减少，并且还补偿了由于制造分散引起的寄生电容的波动。

公开(公告)号：US06760552B1

公开(公告)日：2004-07-06

申请号：US09532420

申请日：2000-03-23

申请人： Akio Tajima ,  Hiroaki Takahashi ,  Soichiro Araki ,  Naoya Henmi ,  Yoshihiko Suemura ,  Yoshiharu Maeno ,  Seigo Takahashi

发明人： Akio Tajima ,  Hiroaki Takahashi ,  Soichiro Araki ,  Naoya Henmi ,  Yoshihiko Suemura ,  Yoshiharu Maeno ,  Seigo Takahashi

IPC分类号： H04B1006

CPC分类号： H04B10/6931

摘要： An optical receiving circuit 1 is composed of a preamplifier circuit 2, an output differential amplifier 3 and a mean value holding circuit 4. The optical receiving circuit 1 is connected to a photodetector 5 for receiving an input optical signal and outputting current. For the preamplifier circuit 2, a transimpedance type circuit may also be used. The preamplifier circuit 2 comprises a feedback resistor 21 and a resistor for detecting output voltage 22, the transimpedance gain is 55 dB &OHgr; and 3 dB bandwidth when the photodetector 5 the capacity of which is 0.2 pF is connected to its output is 8 GHz. The output differential amplifier 3 discriminates and regenerates data by regulating reference voltage Vref between the high level and the low level of the amplitude of an input signal. The mean value holding circuit 4 includes a sample-hold circuit 41 and capacity 42 for holding the mean value of voltage output from the preamplifier circuit 2. As a CR time constant based upon the capacity 42 and the resistor for detection 22 is 1 ns., the mean value level of a received signal can be detected in approximately one byte of the data of 10 Gb/s. The sample-hold circuit 41 samples the detected mean value level according to a sampling pulse from an external device and holds it. The output of the sample-hold circuit 41 is used for the reference voltage of the differential amplifier 3.

摘要翻译： 光接收电路1由前置放大电路2，输出差分放大器3和平均值保持电路4组成。光接收电路1连接到用于接收输入光信号并输出​​电流的光电检测器5。 对于前置放大器电路2，也可以使用跨阻型电路。 前置放大器电路2包括反馈电阻器21和用于检测输出电压22的电阻器，当其电容为0.2pF的光电检测器5连接到其输出端时，跨阻增益为55dBΩ和3dB带宽为8GHz。 输出差分放大器3通过调节输入信号的幅度的高电平和低电平之间的参考电压Vref来识别和再生数据。 平均值保持电路4包括采样保持电路41和用于保持从前置放大器电路2输出的电压的平均值的电容42.由于基于电容42和检测电阻22的CR时间常数为1ns。 可以在10Gb / s的数据的大约一个字节中检测接收信号的平均值电平。 采样保持电路41根据来自外部设备的采样脉冲对检测到的平均值电平进行采样并保持。 采样保持电路41的输出用于差分放大器3的参考电压。

公开(公告)号：US06684032B1

公开(公告)日：2004-01-27

申请号：US09525485

申请日：2000-03-16

申请人： Toshiyuki Umeda

发明人： Toshiyuki Umeda

IPC分类号： H04B1006

CPC分类号： H04B10/695

摘要： An optical signal receiver apparatus is comprised of a photodiode for converting an input photo-signal into a photoelectric current and an integrated circuit having a transimpedance amplifier for converting the photoelectric current into a voltage signal and amplifying it. The power source line of the photodiode can be shortened by supplying a power source current to the photodiode through a current detector in the integrated circuit. In addition, a current drain circuit is used to drain a DC current from the input side of the transimpedance amplifier on the basis of the detection result obtained by the current detector. The current drain circuit is operated when a photoelectric current is output from the photodiode.

摘要翻译： 光信号接收装置包括用于将输入光信号转换为光电流的光电二极管和具有跨阻放大器的集成电路，用于将光电流转换成电压信号并对其进行放大。 通过集成电路中的电流检测器向光电二极管提供电源电流，可以缩短光电二极管的电源线。 此外，根据电流检测器得到的检测结果，使用电流漏极电路从跨阻抗放大器的输入侧排出直流电流。 当从光电二极管输出光电流时，电流漏极电路工作。

公开(公告)号：US06674974B1

公开(公告)日：2004-01-06

申请号：US09627277

申请日：2000-07-28

申请人： Ronald D. Stieger ,  George Steven Mecherle ,  Mark A. Mollo

发明人： Ronald D. Stieger ,  George Steven Mecherle ,  Mark A. Mollo

IPC分类号： H04B1006

CPC分类号： H04B10/1121

摘要： A tracking system and method in an optical communications system utilizing an optical communications beam. In one embodiment, the disclosed tracking system includes a tracking detector having a plurality of regions coupled to a corresponding plurality of tracking channel circuits. Each of the tracking channel circuits includes an optical detector coupled to receive the optical communications beam. The peak-to-peak amplitude modulation in the optical communications beam is measured by substantially reducing or removing a direct current (DC) offset present in the optical communications beam. In one embodiment, after the DC offset is substantially reduced or removed, the signal is then amplified and converted into an all positive signal, which is then filtered. The filtered signal is one of a plurality of tracking signal outputs, which are input to an alignment circuit. The alignment circuit is used to help maintain the alignment of the optical communications beam between the optical transmitter and receiver of the optical communications system. In one embodiment, each of the plurality of tracking signal outputs are also input into a gain control circuit. The gain control circuit is coupled to generate a gain control signal, which used to control the gain of variable gain amplifiers in the tracking channel circuits.

摘要翻译： 一种利用光通信光束的光通信系统中的跟踪系统和方法。 在一个实施例中，所公开的跟踪系统包括跟踪检测器，其具有耦合到对应的多个跟踪信道电路的多个区域。 每个跟踪通道电路包括耦合以接收光通信光束的光检测器。 通过基本上减少或去除存在于光通信光束中的直流（DC）偏移来测量光通信光束中的峰 - 峰幅度调制。 在一个实施例中，在DC偏移基本上减小或去除之后，该信号然后被放大并转换成全正信号，然后被滤波。 经滤波的信号是多个跟踪信号输出之一，其被输入到对准电路。 对准电路用于帮助维持光通信光束在光通信系统的光发射机和接收机之间的对准。 在一个实施例中，多个跟踪信号输出中的每一个也被输入到增益控制电路中。 增益控制电路被耦合以产生增益控制信号，其用于控制​​跟踪通道电路中的可变增益放大器的增益。

公开(公告)号：US06587244B1

公开(公告)日：2003-07-01

申请号：US09407808

申请日：1999-09-28

申请人： Ikuo Ishinabe ,  Kazuyoshi Yahagi

发明人： Ikuo Ishinabe ,  Kazuyoshi Yahagi

IPC分类号： H04B1006

CPC分类号： G01S7/006 ,  G01C1/02 ,  G01S7/481

摘要： The present invention provides an optical communication system, which comprises photodetection means for receiving communication light and optical means for forming an image from the communication light on the photodetection means, wherein the optical means is provided with a diffraction optical member having at least 0-th diffraction order.

摘要翻译： 本发明提供了一种光通信系统，其包括用于接收通信光的光检测装置和用于从光检测装置上的通信光形成图像的光学装置，其中光学装置设置有至少具有第0个 衍射级。

公开(公告)号：US06567200B1

公开(公告)日：2003-05-20

申请号：US09462618

申请日：2000-01-10

申请人： Raimund Pammer ,  Helmut Rieder

发明人： Raimund Pammer ,  Helmut Rieder

IPC分类号： H04B1006

CPC分类号： H04B10/69 ,  H04B10/60

摘要： A data receiver circuit for infrared signals, in particular for toll systems on roads, comprises several infrared detectors (5) the signals of which are supplied to a summing circuit so as to increase the useful power while suppressing interfering signals. To improve the signal/noise ratio, it is provided that several input circuits are provided with an infrared detector (5a, 5b to 5n) each and with an associated separate amplifier (6a, 6b to 6n), and that these input circuits are connected in parallel to the summing circuit (7).

摘要翻译： 用于红外信号的数据接收器电路，特别是用于道路上的收费系统的数据接收器电路包括几个红外检测器（5），其信号被提供给求和电路，以便在抑制干扰信号的同时增加有用功率。 为了提高信号/噪声比，提供了几个输入电路分别设置有红外检测器（5a，5b至5n）以及相关联的单独的放大器（6a，6b至6n），并且这些输入电路被连接 与所述求和电路（7）并联。

公开(公告)号：US06525858B1

公开(公告)日：2003-02-25

申请号：US09090145

申请日：1998-06-04

申请人： Takeshi Nagahori

发明人： Takeshi Nagahori

IPC分类号： H04B1006

CPC分类号： H04B10/697

摘要： A subscriber-line terminal apparatus comprising an access control circuit for time-division multiple access to a plurality of subscriber-line terminating sets, a multi-channel array optical transmitter, and a multi-channel optical receiver, the receiver comprising a differential input amplifier, a first photoelectric converter element whose cathode is connected to a reverse-bias power supply and whose anode is connected to one input terminal of the differential input amplifier, and a second photoelectric converter element whose anode is connected to a reverse-bias power supply and whose cathode is connected to the other input terminal of the differential input amplifier.

摘要翻译： 一种用户线终端装置，包括用于对多个用户线路终端机进行时分多址的接入控制电路，多信道阵列光发射机和多信道光接收机，所述接收机包括差分输入放大器 第一光电转换元件，其阴极连接到反向偏置电源并且其阳极连接到差分输入放大器的一个输入端;以及第二光电转换元件，其阳极连接到反向偏置电源， 其阴极连接到差分输入放大器的另一个输入端。

公开(公告)号：US06501583B1

公开(公告)日：2002-12-31

申请号：US09417726

申请日：1999-10-14

申请人： Mitsuo Akashi ,  Hiroki Irie ,  Yasuhiro Yamada ,  Akihiro Hayami ,  Naohiko Baba ,  Tomonao Kikuchi

发明人： Mitsuo Akashi ,  Hiroki Irie ,  Yasuhiro Yamada ,  Akihiro Hayami ,  Naohiko Baba ,  Tomonao Kikuchi

IPC分类号： H04B1006

CPC分类号： H03K3/0231 ,  H03L7/0995 ,  H04L7/033

摘要： Two sets of a high speed differential amplifier and a low speed differential amplifier are prepared, and frequency response speeds of these high speed/low speed differential amplifiers are different from each other. Both an oscillating frequency and a frequency modulation sensitivity of a ring oscillator type voltage-controlled oscillator circuit can be separately set by adding two outputs of these differential amplifiers to each other and by varying the selection ratio of these high speed/low speed differential amplifiers in a linear manner. Thus, the setting ranges for the oscillating frequency and the frequency modulation sensitivity are enlarged. At this time, since a summation of currents flowing through the high speed/low speed differential amplifiers is continuously made constant, the oscillating frequency depending characteristic of the output amplitude of the VCO circuit can be canceled. Furthermore, since control signals are supplied in a differential structure, increasing of jitter components caused by the common mode noise can be suppressed.

摘要翻译： 准备了两组高速差分放大器和低速差分放大器，这些高速/低速差分放大器的频率响应速度彼此不同。 可以通过将这些差分放大器的两个输出相互添加并通过改变这些高速/低速差分放大器的选择比来分别设置环形振荡器型压控振荡器电路的振荡频率和频率调制灵敏度 线性的。 因此，振荡频率和频率调制灵敏度的设定范围被扩大。 此时，由于流过高速/低速差分放大器的电流的总和连续变为恒定，因此可以消除VCO电路的输出振幅的振荡频率依赖特性。 此外，由于控制信号以差分结构提供，所以可以抑制由共模噪声引起的抖动分量的增加。

公开(公告)号：US06445479B1

公开(公告)日：2002-09-03

申请号：US09216396

申请日：1998-12-18

申请人： Verne C. Hornback ,  Derryl D. J. Allman

发明人： Verne C. Hornback ,  Derryl D. J. Allman

IPC分类号： H04B1006

CPC分类号： H04B10/69

摘要： A receiver for detecting a stream of optical data bits which are transmitted at a predetermined frequency includes a plurality of optically-active devices arranged on an integrated circuit substrate in an array. The plurality of optically-active devices are capable of being positioned to receive the stream of optical data bits which are transmitted as light, and each of the optically active devices is capable of detecting light in an optically active state and generating a detected signal corresponding thereto. A control circuit receives a clock signal at a rate corresponding to the predetermined frequency and generates control signals which cause a different one of the plurality of optically-active devices to be in the optically active state during each successive period and thereby detect the presence of light during each of said successive periods and generate the detected signals corresponding to the data bit stream.

摘要翻译： 用于检测以预定频率发送的光数据比特流的接收机包括布置在阵列中的集成电路基板上的多个光学有源装置。 多个光学活动装置能够被定位成接收作为光传输的光数据比特流，并且每个光学有源装置能够检测光学活动状态的光并产生与其对应的检测信号 。 控制电路以对应于预定频率的速率接收时钟信号，并且产生控制信号，这些控制信号使得多个光学有源器件中的不同的一个在每个连续的周期期间处于光学活动状态，从而检测光的存在 并且产生与数据比特流对应的检测信号。

公开(公告)号：US06266173B1

公开(公告)日：2001-07-24

申请号：US09420629

申请日：1999-10-20

申请人： Robert R. Hayes

发明人： Robert R. Hayes

IPC分类号： H04B1006

CPC分类号： H04B10/673 ,  H04B10/118 ,  H04B10/69

摘要： A method and apparatus for converting a frequency modulated lightwave into an electrical signal that is proportional to instantaneous frequency deviations of the frequency modulated lightwave. The frequency modulated lightwave is amplified by an amount equal to or greater than a desired FM processing gain to provide an amplified frequency modulated lightwave. The amplified lightwave is filtered to restrict amplifier noise added to the frequency modulated lightwave to provide a filtered lightwave. The amplitude of the filtered lightwave is limited to remove unwanted amplitude fluctuations to provide a limited lightwave. The limited lightwave is split into a first split lightwave and a second split lightwave. The second split lightwave is delayed relative to the first split lightwave, to provide a delayed second split lightwave. The delayed second split lightwave is combined with the first split lightwave to provide:(1) a sum of first split lightwave fields and delayed second split lightwave fields, and (2) a difference of the first split lightwave fields and the delayed second split lightwave fields, the splitting, delaying and combining providing the sum and the difference having fields with parallel polarizations. The sum is detected by a first photodetector and the difference is detected by a second photodetector, the first photodetector and second photodetector being connected in series with a common terminal therebetween, the common terminal providing to a following amplifier a difference current that is proportional to a difference between first photodetector curent and second photodetector current, the difference current being proportional to instantaneous frequency deviation of the frequency modulated lightwave.

摘要翻译： 一种用于将频率调制光波转换成与频率调制光波的瞬时频率偏差成比例的电信号的方法和装置。 频率调制光波被放大等于或大于期望的FM处理增益的量以提供放大的调频光波。 对放大的光波进行滤波以限制加到调频光波的放大器噪声，以提供滤波后的光波。 滤波光波的幅度被限制以去除不期望的幅度波动以提供有限的光波。 有限的光波被分为第一分裂光波和第二分光波。 第二分裂光波相对于第一分裂光波被延迟，以提供延迟的第二分裂光波。 延迟的第二分裂光波与第一分裂光波组合以提供：（1）第一分裂光波场和延迟的第二分裂光波场的和，以及（2）第一分裂光波场和延迟的第二分裂光波 字段，分割，延迟和组合，提供具有平行偏振的场的和和差。 所述和由第一光电检测器检测，并且差异由第二光电检测器检测，第一光电检测器和第二光电检测器与它们之间的公共端串联连接，公共端向随后的放大器提供与电流成比例的差电流 第一光电检测器和第二光电检测器电流之间的差异，差电流与调频光波的瞬时频率偏差成比例。