公开(公告)号：US06661503B1

公开(公告)日：2003-12-09

申请号：US09485723

申请日：2000-05-12

申请人： Kazuo Yamaguchi ,  Takashi Minato ,  Shinzoo Nishiyama ,  Atsushi Murata ,  Naohiko Baba ,  Tsutomu Yoshiya ,  Kazumi Kawamoto ,  Kyouichi Yamamoto ,  Kazuo Aoyama

发明人： Kazuo Yamaguchi ,  Takashi Minato ,  Shinzoo Nishiyama ,  Atsushi Murata ,  Naohiko Baba ,  Tsutomu Yoshiya ,  Kazumi Kawamoto ,  Kyouichi Yamamoto ,  Kazuo Aoyama

IPC分类号： G01N2100

CPC分类号： G01M11/331

摘要： A method of manufacturing an optic transmission module assures a high reliability for the module by inspecting the character of a low bit error rate (BER) of the module quickly and accurately. The module is employed in an optical communication system (light transmission system) required to cope with information communication systems that are becoming faster and faster in operation and larger and larger in capacity. Also disclosed is a system and a method for inspection of the BER character which uses a rectangular wave pulse as an interference light to calculate a degradation quantity of a signal-to-noise ratio (S/N) on the basis of a simple theory, thereby inspecting the BER character by extrapolating a case in which there is no interference light (S/X=∞ or X=0) with use of a sign error rate theoretical value according to a bit error rate of a light signal measured according to the degradation quantity.

摘要翻译： 制造光传输模块的方法通过快速，准确地检查模块的低误码率（BER）的特性来确保模块的高可靠性。 该模块用于应对在运行中变得越来越快，容量越来越大的信息通信系统所需的光通信系统（光传输系统）中。 还公开了一种基于简单的理论，使用矩形波脉冲作为干涉光来检查BER特性的系统和方法来计算信噪比（S / N）的劣化量， 从而通过使用符号误差率理论值，根据根据该信号测量的光信号的误码率外推不存在干扰光的情况（S / X =∞或X = 0）来检查BER特性 降解量。

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：US06829441B2

公开(公告)日：2004-12-07

申请号：US10455411

申请日：2003-06-06

申请人： Norio Chujo ,  Yoshihiko Hayashi ,  Akio Osaki ,  Naohiko Baba

发明人： Norio Chujo ,  Yoshihiko Hayashi ,  Akio Osaki ,  Naohiko Baba

IPC分类号： H04B1004

CPC分类号： H04L25/0282 ,  H04B10/504 ,  H04B10/564

摘要： A driver circuit comprises a first differential-amplifier circuit having a pair of first transistors with emitters thereof connected to each other and a first resistor provided between an emitter connection point of the first transistors and a first power supply. Different electric potentials are applied to the bases of the pair of the first transistors to set a ratio of a current flowing through one of the pair of the first transistors to a current flowing through the other first transistor at about 1/100 or smaller. An amplitude of an output current is controlled by the higher of the electric potentials applied to the base of one of the first transistors.

摘要翻译： 驱动器电路包括具有一对第一晶体管的第一差分放大器电路，其中发射极彼此连接，第一电阻器设置在第一晶体管的发射极连接点与第一电源之间。 不同的电位被施加到一对第一晶体管的基极，以将流过一对第一晶体管中的电流的电流与流过另一个第一晶体管的电流的比率约为1/100或更小。 输出电流的幅度由施加到第一晶体管之一的基极的较高电位来控制。

公开(公告)号：US06606177B1

公开(公告)日：2003-08-12

申请号：US09392566

申请日：1999-09-09

申请人： Norio Chujo ,  Yoshihiko Hayashi ,  Akio Osaki ,  Naohiko Baba

发明人： Norio Chujo ,  Yoshihiko Hayashi ,  Akio Osaki ,  Naohiko Baba

IPC分类号： H04B1004

CPC分类号： H04L25/0282 ,  H04B10/504 ,  H04B10/564

摘要： A driver circuit comprises a first differential-amplifier circuit having a pair of first transistors with emitters thereof connected to each other and a first resistor provided between an emitter connection point of the first transistors and a first power supply. Different electric potentials are applied to the bases of the pair of the first transistors to set a ratio of a current flowing through one of the pair of the first transistors to a current flowing through the other first transistor at about {fraction (1/100)} or smaller. An amplitude of an output current is controlled by the higher of the electric potentials applied to the base of one of the first transistors.

公开(公告)号：US06229832B1

公开(公告)日：2001-05-08

申请号：US09188364

申请日：1998-11-10

申请人： Naohiko Baba ,  Hideyuki Serizawa ,  Akihiro Hayami ,  Tadashi Hatano ,  Yasuhiro Yamada ,  Norio Chujo

发明人： Naohiko Baba ,  Hideyuki Serizawa ,  Akihiro Hayami ,  Tadashi Hatano ,  Yasuhiro Yamada ,  Norio Chujo

IPC分类号： H01S300

CPC分类号： H01S5/06808 ,  H01S5/0035 ,  H01S5/02415 ,  H01S5/0612 ,  H01S5/0687

摘要： An optical transmitter includes a plurality of optical wavelength stability control apparatuses, each of which is capable of compensating for a wavelength drift by varying a laser diode drive current. Each of the optical wavelength stability control apparatuses detects a laser diode drive current, which is controlled by an auto power control circuit, by using a laser diode drive current detector. The laser diode drive current is normalized by a laser diode drive current increase/decrease normalization unit. A laser diode temperature control target value is generated at a compensated reference voltage generator, in response to the normalized laser diode drive current, to control a current value applied to a thermoelectric cooler so that an output value of a temperature monitor circuit approaches a predetermined laser diode temperature control target value.

摘要翻译： 光发射机包括多个光波长稳定性控制装置，每个光波长稳定性控制装置能够通过改变激光二极管驱动电流来补偿波长漂移。 每个光波长稳定性控制装置通过使用激光二极管驱动电流检测器来检测由自动功率控制电路控制的激光二极管驱动电流。 激光二极管驱动电流通过激光二极管驱动电流增加/减少归一化单位进行归一化。 激光二极管温度控制目标值响应于归一化激光二极管驱动电流在补偿参考电压发生器处产生，以控制施加到热电冷却器的电流值，使得温度监视电路的输出值接近预定激光器 二极管温度控制目标值。

公开(公告)号：US07164865B2

公开(公告)日：2007-01-16

申请号：US09814693

申请日：2001-03-15

申请人： Kimio Tatsuno ,  Tatemi Ido ,  Yasunori Iwafuji ,  Hideyuki Kuwano ,  Naohiko Baba

发明人： Kimio Tatsuno ,  Tatemi Ido ,  Yasunori Iwafuji ,  Hideyuki Kuwano ,  Naohiko Baba

IPC分类号： H04B10/04 ,  H04B10/12 ,  H04J14/02 ,  H01S3/10 ,  H01S3/13

CPC分类号： H01S5/0687 ,  H01S5/005 ,  H01S5/02216 ,  H01S5/02248 ,  H01S5/06804 ,  H01S5/4087

摘要： An object of disclosed technology is to control lasing wavelengths so that a wavelength shift does not occurs. Another object is to permit wavelengths of a light source for wavelength division multiplexing optical-fiber communication system to be variable in response to an ITU-TS grid. A means for achieving the objects is as follows: locating an etalon in a light path of diode laser light, which is a parallel plane wave changed by a collimator lens; generating a wavelength error signal from a difference between both of divided pieces of light from transmitted light or reflected light; and locking a wavelength of a diode laser device according to the wavelength error signal.

摘要翻译： 所公开的技术的目的是控制激光波长，使得波长偏移不发生。 另一个目的是允许用于波分复用光纤通信系统的光源的波长响应ITU-TS网格而变化。 用于实现目的的手段如下：将准直透镜改变的平行平面波的二极管激光光路中的标准具定位; 根据来自透射光或反射光的分割光之间的差产生波长误差信号; 并根据波长误差信号锁定二极管激光器件的波长。

公开(公告)号：US07031620B2

公开(公告)日：2006-04-18

申请号：US09905045

申请日：2001-07-12

申请人： Shigeru Tokita ,  Mitsuo Akashi ,  Naohiko Baba ,  Yoichi Honzawa ,  Hideki Satoh

发明人： Shigeru Tokita ,  Mitsuo Akashi ,  Naohiko Baba ,  Yoichi Honzawa ,  Hideki Satoh

IPC分类号： H04B10/04

CPC分类号： H04B10/2587

摘要： An optical transmission system includes a current source for outputting a drive current, a semiconductor laser for converting the drive current into a stimulated emission light and producing the same, a drive circuit for converting a transmission data signal into a modulation control signal and outputting the same, an optical modulator for receiving the stimulated emission light and a shading control signal for interrupting light emission and producing and outputting transmission signal light by changing an amount of transmission of the stimulated emission light according to the shading control signal, and a shading element for receiving the transmission signal light and a shading control signal for interrupting light emission and interrupting the transmission of the transmission signal light according to the shading control signal whereby an optical signal having wrong optical wavelength is rapidly prevented.