公开(公告)号：US06501774B2

公开(公告)日：2002-12-31

申请号：US09983184

申请日：2001-10-23

申请人： Hiroshi Kuwahara ,  Norio Nagase ,  Setsuo Misaizu ,  Tetsuya Kiyonaga ,  Tomoyuki Otsuka ,  Motoyoshi Sekiya

发明人： Hiroshi Kuwahara ,  Norio Nagase ,  Setsuo Misaizu ,  Tetsuya Kiyonaga ,  Tomoyuki Otsuka ,  Motoyoshi Sekiya

IPC分类号： H01S313

CPC分类号： H01S5/0687 ,  H01S3/1317 ,  H01S5/06804 ,  H04B10/506 ,  H04B10/572 ,  H04J14/02

摘要： The optical transmission apparatus for multiple wavelengths according to the present invention comprises; a light source, a temperature control section for controlling the temperature of the light source, a temperature control (ATC) loop for controlling the operation of the temperature control section, and a wavelength control (AFC) loop. The ATC loop detects the temperature of the light source and feedback controls the operation of the temperature control section, so that the optical output wavelengths of the light source fall within a wavelength capture range corresponding to a target wavelength of the AFC loop. The AFC loop has a wavelength detection filter having a periodic transmission wavelength characteristic. After the operation of the ATC loop has stabilized, a wavelength capture operation is commenced, and the operation of the temperature control section is controlled so that the optical output wavelength of the light source is captured at a stable point corresponding to a target wavelength, among a plurality of stable points.

摘要翻译： 根据本发明的用于多个波长的光传输装置包括： 光源，用于控制光源的温度的温度控制部，用于控制温度控制部的动作的温度控制（ATC）回路和波长控制（AFC）回路。 ATC环路检测光源的温度，并且反馈控制温度控制部分的操作，使得光源的光输出波长落在对应于AFC回路的目标波长的波长捕获范围内。 AFC回路具有具有周期性透射波长特性的波长检测滤波器。 在ATC环路的操作稳定后，开始波长捕获操作，并且控制温度控制部分的操作，使得在与目标波长相对应的稳定点捕获光源的光输出波长，其中 多个稳定点。

公开(公告)号：US06658213B2

公开(公告)日：2003-12-02

申请号：US09768696

申请日：2001-01-24

申请人： Akihiko Hayashi ,  Shinichiro Sano ,  Norio Nagase ,  Tomoyuki Otsuka

发明人： Akihiko Hayashi ,  Shinichiro Sano ,  Norio Nagase ,  Tomoyuki Otsuka

IPC分类号： H04B1004

CPC分类号： G02F1/0123 ,  G02F2201/58

摘要： The invention relates to a modulation controlling circuit for supplying a modulating signal to an external modulator that outputs a modulated optical signal, while setting a proper operating point in the external modulator. The external modulator that operates in cooperation with the modulation controlling circuit of the invention enables high-quality modulation at a wide bit rate range. Therefore, in an optical transmission system or a measuring instrument to which the invention is applied, the characteristics and the performance are improved and the operation is made stable without loss of advantages of the external modulator.

公开(公告)号：USD619631S1

公开(公告)日：2010-07-13

申请号：US29332380

申请日：2009-02-13

申请人： Tomoyuki Otsuka

设计人： Tomoyuki Otsuka

公开(公告)号：US06694273B2

公开(公告)日：2004-02-17

申请号：US09933769

申请日：2001-08-22

申请人： Takashi Kurooka ,  Hisaya Sakamoto ,  Akimitsu Miyazaki ,  Tomoyuki Otsuka

发明人： Takashi Kurooka ,  Hisaya Sakamoto ,  Akimitsu Miyazaki ,  Tomoyuki Otsuka

IPC分类号： G06F500

CPC分类号： H04B10/2513 ,  H04B2210/252

摘要： In a receiving apparatus, there are included a compensation characteristic variable type waveform degradation compensating unit capable of compensating for waveform degradation of a received signal stemming from a transmission line, a received waveform measuring unit for measuring waveform data on the received signal (which will be referred to hereinafter as “received waveform data), and a control unit for controlling a compensation characteristic of the waveform degradation compensating unit to minimize a difference between frequency data on the received signal, obtained by converting the received waveform data acquired by the received waveform measuring unit into a frequency domain, and frequency data on a reference waveform free from waveform degradation. With this configuration, certain compensation for the waveform degradation of the received signal stemming from chromatic dispersion or the like becomes feasible without using a dispersion compensation fiber.

摘要翻译： 在接收装置中，包括能够补偿来自传输线的接收信号的波形劣化的补偿特性可变型波形劣化补偿单元，接收波形测量单元，用于测量接收信号的波形数据（将是 以下称为“接收波形数据”）以及控制单元，用于控制波形劣化补偿单元的补偿特性，以最小化通过将接收到的波形测量获得的接收波形数据进行转换而获得的接收信号的频率数据之间的差异 单位变为频域，并且在没有波形劣化的参考波形上的频率数据，通过这种配置，在不使用色散补偿光纤的情况下，可以对由色散等产生的接收信号的波形劣化进行一定的补偿。

公开(公告)号：US06970613B2

公开(公告)日：2005-11-29

申请号：US10829367

申请日：2004-04-22

申请人： Hiroyuki Furukawa ,  Tomoyuki Otsuka

发明人： Hiroyuki Furukawa ,  Tomoyuki Otsuka

IPC分类号： G02B6/26 ,  G02B6/28 ,  H04B10/07 ,  H04B10/2507 ,  H04B10/27 ,  H04B10/29 ,  H04B10/40 ,  H04B10/50 ,  H04B10/60 ,  H04B10/66 ,  H04J14/00 ,  H04J14/02

CPC分类号： H04B10/296 ,  H04J14/0221

摘要： The optical receiver includes: an optical input port for receiving WDM signals; a transmittable-wavelength-variable filtering unit which transmits, of the received WDM signals, a light signal in a predetermined transmittable wavelength bandwidth with a desired central wavelength of λi (i=1 to n: n is an integer number greater than 2); an optical output port which outputs the remaining light signals at wavelengths (λi) (k=1 to n; k≠i) untransmittable through the transmittable-wavelength-variable filtering unit; and a control unit which controls the central wavelength so that the level of the light signal passing through the transmittable-wavelength-variable filtering unit is the maximum. It is whereby possible to flexibly accommodate changes in number of channels combined in a WDM system, and to adaptively minimize ASE light leaking into the photoreceptor of the optical receiver even in a CWDM system with wide channel spacing.

公开(公告)号：US06975162B2

公开(公告)日：2005-12-13

申请号：US11094535

申请日：2005-03-31

申请人： Yuji Tamura ,  Tomoyuki Otsuka

发明人： Yuji Tamura ,  Tomoyuki Otsuka

IPC分类号： G05F1/56 ,  G05F1/10 ,  G05F3/04

CPC分类号： G05F1/56

摘要： A constant current driving circuit for supplying a constant current to a load circuit includes: a first driver circuit having a pulse width converting circuit for converting a first difference detection signal into a pulse signal having a pulse width corresponding to a signal level of the first difference detection signal, a switch turned on/off on a basis of the pulse signal, and a smoothing circuit for supplying a smoothed first load current to the load circuit; a first current detecting circuit for converting the first load current into a first voltage corresponding to the first load current, and outputting a first current detection signal; a second driver circuit for supplying a second load current to the load circuit on a basis of a signal level of a second difference detection signal; a second current detecting circuit for converting the second load current into a second voltage corresponding to the second load current, and outputting a second current detection signal; a first difference detecting circuit for calculating the first difference detection signal to make zero a difference between the first current detection signal and an input voltage; a second difference detecting circuit for detecting a difference voltage between the first current detection signal and the input voltage, and outputting a third difference detection signal; and a third difference detecting circuit for detecting a difference voltage between the third difference detection signal and the second current detection signal, and outputting the second difference detection signal.

摘要翻译： 用于向负载电路提供恒定电流的恒流驱动电路包括：具有脉冲宽度转换电路的第一驱动电路，用于将第一差分检测信​​号转换成具有对应于第一差的信号电平的脉冲宽度的脉冲信号 检测信号，基于脉冲信号接通/断开的开关;以及平滑电路，用于向所述负载电路提供平滑的第一负载电流; 第一电流检测电路，用于将第一负载电流转换成对应于第一负载电流的第一电压，并输出第一电流检测信号; 第二驱动电路，用于根据第二差分检测信​​号的信号电平向负载电路提供第二负载电流; 第二电流检测电路，用于将第二负载电流转换成与第二负载电流对应的第二电压，并输出第二电流检测信号; 第一差分检测电路，用于计算第一差分检测信​​号，使得第一电流检测信号和输入电压之间的差值为零; 第二差分检测电路，用于检测第一电流检测信号和输入电压之间的差分电压，并输出第三差分检测信​​号; 以及第三差分检测电路，用于检测第三差分检测信​​号和第二电流检测信号之间的差分电压，并输出第二差分检测信​​号。

公开(公告)号：US20050168269A1

公开(公告)日：2005-08-04

申请号：US11094535

申请日：2005-03-31

申请人： Yuji Tamura ,  Tomoyuki Otsuka

发明人： Yuji Tamura ,  Tomoyuki Otsuka

IPC分类号： G05F1/56 ,  G05F1/40

CPC分类号： G05F1/56

摘要： A constant current driving circuit for supplying a constant current to a load circuit includes: a first driver circuit having a pulse width converting circuit for converting a first difference detection signal into a pulse signal having a pulse width corresponding to a signal level of the first difference detection signal, a switch turned on/off on a basis of the pulse signal, and a smoothing circuit for supplying a smoothed first load current to the load circuit; a first current detecting circuit for converting the first load current into a first voltage corresponding to the first load current, and outputting a first current detection signal; a second driver circuit for supplying a second load current to the load circuit on a basis of a signal level of a second difference detection signal; a second current detecting circuit for converting the second load current into a second voltage corresponding to the second load current, and outputting a second current detection signal; a first difference detecting circuit for calculating the first difference detection signal to make zero a difference between the first current detection signal and an input voltage; a second difference detecting circuit for detecting a difference voltage between the first current detection signal and the input voltage, and outputting a third difference detection signal; and a third difference detecting circuit for detecting a difference voltage between the third difference detection signal and the second current detection signal, and outputting the second difference detection signal.

摘要翻译： 用于向负载电路提供恒定电流的恒流驱动电路包括：具有脉冲宽度转换电路的第一驱动电路，用于将第一差分检测信​​号转换成具有对应于第一差的信号电平的脉冲宽度的脉冲信号 检测信号，基于脉冲信号接通/断开的开关;以及平滑电路，用于向所述负载电路提供平滑的第一负载电流; 第一电流检测电路，用于将第一负载电流转换成对应于第一负载电流的第一电压，并输出第一电流检测信号; 第二驱动电路，用于根据第二差分检测信​​号的信号电平向负载电路提供第二负载电流; 第二电流检测电路，用于将第二负载电流转换成与第二负载电流对应的第二电压，并输出第二电流检测信号; 第一差分检测电路，用于计算第一差分检测信​​号，使得第一电流检测信号和输入电压之间的差值为零; 第二差分检测电路，用于检测第一电流检测信号和输入电压之间的差分电压，并输出第三差分检测信​​号; 以及第三差分检测电路，用于检测第三差分检测信​​号和第二电流检测信号之间的差分电压，并输出第二差分检测信​​号。

公开(公告)号：US20050157976A1

公开(公告)日：2005-07-21

申请号：US10829367

申请日：2004-04-22

申请人： Hiroyuki Furukawa ,  Tomoyuki Otsuka

发明人： Hiroyuki Furukawa ,  Tomoyuki Otsuka

IPC分类号： G02B6/26 ,  G02B6/28 ,  H04B10/07 ,  H04B10/2507 ,  H04B10/27 ,  H04B10/29 ,  H04B10/40 ,  H04B10/50 ,  H04B10/60 ,  H04B10/66 ,  H04J14/00 ,  H04J14/02

CPC分类号： H04B10/296 ,  H04J14/0221

摘要： The optical receiver includes: an optical input port for receiving WDM signals; a transmittable-wavelength-variable filtering unit which transmits, of the received WDM signals, a light signal in a predetermined transmittable wavelength bandwidth with a desired central wavelength of λi (i=1 to n: n is an integer number greater than 2); an optical output port which outputs the remaining light signals at wavelengths (λi) (k=1 to n; k≠i) untransmittable through the transmittable-wavelength-variable filtering unit; and a control unit which controls the central wavelength so that the level of the light signal passing through the transmittable-wavelength-variable filtering unit is the maximum. It is whereby possible to flexibly accommodate changes in number of channels combined in a WDM system, and to adaptively minimize ASE light leaking into the photoreceptor of the optical receiver even in a CWDM system with wide channel spacing.

摘要翻译： 光接收机包括：用于接收WDM信号的光输入端口; 可发射波长可变滤波单元，其以所需的中心波长（i = 1至n：n为大于2的整数）传输所接收的WDM信号中预定可发射波长带宽的光信号; 输出通过可透射波长可变滤波单元不可透射的波长（lambdai）（k = 1至n; k