公开(公告)号：US06333806B1

公开(公告)日：2001-12-25

申请号：US09154278

申请日：1998-09-16

申请人： Hiroshi Onaka ,  Nobuhiro Fukushima

发明人： Hiroshi Onaka ,  Nobuhiro Fukushima

IPC分类号： G02F109

CPC分类号： G02F1/09 ,  G02F1/093 ,  G02F2203/48

摘要： An apparatus which attenuates a light signal polarized in a first direction. The apparatus includes a polarization rotation unit and an output unit. The polarization rotation unit rotates the polarization of the light signal to produce a polarization rotated light signal having a polarization component in the first direction and a polarization component in a second direction which is substantially 90 degrees with respect to the first direction. The output unit passes, as an output signal, the polarization component in the second direction of the polarization rotated light signal and blocks the polarization component in the first direction. The polarization rotation unit includes an electromagnet and a permanent magnet which apply magnetic fields in specific directions with respect to the light path. Various yoke constructions are provided for the electromagnet and the permanent magnet. A control circuit maintains the output power of the output signal at a constant level, or maintains a constant ratio between the power level of the output signal and the power level of the light signal before the polarization is rotated. The apparatus can have a wavelength dependent attenuation which compensates for the wavelength dependent gain of an optical amplifier.

摘要翻译： 一种衰减在第一方向上偏振的光信号的装置。 该装置包括偏振旋转单元和输出单元。 偏振旋转单元旋转光信号的偏振，以产生具有第一方向的偏振分量和相对于第一方向基本上为90度的第二方向的偏振分量的偏振旋转光信号。 输出单元将偏振旋转光信号的第二方向上的偏振分量作为输出信号传递，并阻止第一方向的偏振分量。 偏振旋转单元包括在相对于光路在特定方向上施加磁场的电磁体和永磁体。 为电磁铁和永久磁铁提供各种轭结构。 控制电路将输出信号的输出功率维持在恒定水平，或者在偏振旋转之前保持输出信号的功率电平和光信号的功率电平之间的恒定比率。 该装置可以具有波长相关的衰减，其补偿光放大器的与波长相关的增益。

公开(公告)号：US06275314B1

公开(公告)日：2001-08-14

申请号：US09066860

申请日：1998-04-27

申请人： George Ishikawa ,  Hideyuki Miyata ,  Hiroshi Onaka ,  Motoyoshi Sekiya ,  Kazue Otsuka

发明人： George Ishikawa ,  Hideyuki Miyata ,  Hiroshi Onaka ,  Motoyoshi Sekiya ,  Kazue Otsuka

IPC分类号： H04J1402

CPC分类号： G02B6/29377 ,  G02B6/4215 ,  H04B10/25133 ,  H04B10/2525 ,  H04B10/25253 ,  H04B10/255 ,  H04B10/2563 ,  H04B2210/252 ,  H04B2210/254 ,  H04B2210/258 ,  H04J14/02 ,  H04J14/0224

摘要： The invention provides an optical wavelength multiplex transmission method wherein a band in the proximity of a zero dispersion wavelength of an optical fiber is used and optical signals are disposed at efficient channel spacings taking an influence of the band, the wavelength dispersion and the four wave mixing into consideration to realize an optical communication system of an increased capacity which is not influenced by crosstalk by FWM. When optical signals of a plurality of channels having different wavelengths are to be multiplexed and transmitted using an optical fiber, a four wave mixing suppressing guard band of a predetermined bandwidth including the zero-dispersion wavelength &lgr;0 of the optical fiber is set, and signal light waves of the plurality of channels to be multiplexed are arranged on one of the shorter wavelength side and the longer wavelength side outside the guard band.

公开(公告)号：US5973821A

公开(公告)日：1999-10-26

申请号：US154280

申请日：1998-09-16

申请人： Hiroshi Onaka ,  Nobuhiro Fukushima

发明人： Hiroshi Onaka ,  Nobuhiro Fukushima

IPC分类号： G02B26/02 ,  G01R33/02 ,  G02F1/09 ,  G02F1/35 ,  H04B10/079 ,  H04B10/516 ,  H04B10/61

CPC分类号： G02F1/09 ,  G02F1/093 ,  G02F2203/48

摘要： An apparatus which attenuates a light signal polarized in a first direction. The apparatus includes a polarization rotation unit and an output unit. The polarization rotation unit rotates the polarization of the light signal to produce a polarization rotated light signal having a polarization component in the first direction and a polarization component in a second direction which is substantially 90 degrees with respect to the first direction. The output unit passes, as an output signal, the polarization component in the second direction of the polarization rotated light signal and blocks the polarization component in the first direction. The polarization rotation unit includes an electromagnet and a permanent magnet which apply magnetic fields in specific directions with respect to the light path. Various yoke constructions are provided for the electromagnet and the permanent magnet. A control circuit maintains the output power of the output signal at a constant level, or maintains a constant ratio between the power level of the output signal and the power level of the light signal before the polarization is rotated. The apparatus can have a wavelength dependent attenuation which compensates for the wavelength dependent gain of an optical amplifier.

摘要翻译： 一种衰减在第一方向上偏振的光信号的装置。 该装置包括偏振旋转单元和输出单元。 偏振旋转单元旋转光信号的偏振，以产生具有第一方向的偏振分量和相对于第一方向基本上为90度的第二方向的偏振分量的偏振旋转光信号。 输出单元将偏振旋转光信号的第二方向上的偏振分量作为输出信号传递，并阻止第一方向的偏振分量。 偏振旋转单元包括在相对于光路在特定方向上施加磁场的电磁体和永磁体。 为电磁铁和永久磁铁提供各种轭结构。 控制电路将输出信号的输出功率维持在恒定水平，或者在偏振旋转之前保持输出信号的功率电平和光信号的功率电平之间的恒定比率。 该装置可以具有波长相关的衰减，其补偿光放大器的与波长相关的增益。

公开(公告)号：US5886804A

公开(公告)日：1999-03-23

申请号：US627722

申请日：1996-04-01

申请人： Hiroshi Onaka ,  Hideyuki Miyata ,  Kazue Otsuka

发明人： Hiroshi Onaka ,  Hideyuki Miyata ,  Kazue Otsuka

IPC分类号： G02F2/00 ,  H04B10/2507 ,  H04B10/2525 ,  H04B10/2557 ,  H04B10/54 ,  H04B10/548 ,  H04B10/58 ,  H04B10/00

CPC分类号： H04B10/2525 ,  H04B2210/256

摘要： In an optical transmission system for intensively modulating an optical wavelength with a sending signal to be transmitted and optically amplifying a modulated optical signal, a wavelength dispersion characteristic of a single mode optical transmission line can be suitably compensated. The optical transmission system comprises a modulating circuit for modulating optical phases or frequencies of the optical wavelength with the sending signal to set a chirping parameter .alpha. to -0.65 to -1.3, and outputting an modulated signal; an optical transmission line having wavelength residual dispersion value of 16 to 21 ps/nm/Km for transmitting the modulated signal; and a dispersion compensating circuit for compensating wavelength dispersion value, of the optical transmission line, which is set to approximately +500 to +1200 ps/nm when an input optical power is more than -5 dBm.

摘要翻译： 在利用要发送的发送信号和光学放大调制的光信号来集中调制光波长的光传输系统中，可以适当地补偿单模光传输线的波长色散特性。 光传输系统包括调制电路，用于利用发送信号调制光学相位或光波长的频率，以将啁啾参数α设置为-0.65至-1.3，并输出调制信号; 具有用于发送调制信号的波长残留色散值为16〜21ps / nm / Km的光传输线路; 以及用于补偿光传输线的波长色散值的色散补偿电路，当输入光功率大于-5dBm时，其被设置为大约+500至+1200ps / nm。

公开(公告)号：US5856881A

公开(公告)日：1999-01-05

申请号：US903894

申请日：1997-07-31

申请人： Kazue Otsuka ,  Hiroshi Onaka

发明人： Kazue Otsuka ,  Hiroshi Onaka

IPC分类号： G02B6/00 ,  G02B6/02 ,  G02F1/35 ,  H04B10/25 ,  H04B10/2525 ,  H04B10/2537 ,  H04B10/2563 ,  H04B10/12

CPC分类号： H04B10/85 ,  H04B10/2525 ,  H04B10/2563

摘要： An optical fiber transmission line capable of suppressing the generation efficiency of four wave mixing in transmitting wavelength multiplex signal light. The transmission line employs a single mode optical fiber in which a zero dispersion wavelength is varied in the longitudinal direction of the optical fiber more largely than manufacturing variations in manufacturing conditions of the optical fiber. The use of this optical fiber as the transmission line suppresses the generation efficiency of four wave mixing in transmitting the wavelength multiplex signal light to allow the transmission of the wavelength multiplex signal light with a reduced crosstalk.

摘要翻译： 一种能够抑制发送波长多路复用信号光中的四波混频的发生效率的光纤传输线。 传输线采用单模光纤，其中零色散波长在光纤的纵向方向上变化大于制造光纤的制造条件的变化。 使用该光纤作为传输线抑制了发射波长多路复用信号光时的四波混频的产生效率，以允许以串扰减小的波长多路复用信号光的传输。

公开(公告)号：US5737118A

公开(公告)日：1998-04-07

申请号：US601244

申请日：1996-02-14

申请人： Yasushi Sugaya ,  Susumu Kinoshita ,  Hiroshi Onaka ,  Terumi Chikama

发明人： Yasushi Sugaya ,  Susumu Kinoshita ,  Hiroshi Onaka ,  Terumi Chikama

IPC分类号： H01S3/094 ,  H01S3/06 ,  H01S3/067 ,  H01S3/0941 ,  H01S3/10 ,  H01S3/13 ,  H01S5/042 ,  H01S5/06 ,  H01S5/068 ,  H01S5/0683 ,  H01S5/50 ,  H04B10/03 ,  H04B10/07 ,  H04B10/079 ,  H04B10/293 ,  H04B10/90 ,  H01S3/00

CPC分类号： H01S3/1301 ,  H01S5/0683 ,  H01S5/0617 ,  H01S5/06808 ,  H01S5/50

摘要： A computer-controlled optical amplifying apparatus, which includes an optical amplifying unit including an optical amplifying medium and an optical amplifying control unit controlling the optical amplifying unit under the control of a computer. This optical amplifying control unit is constituted by a status monitoring unit for monitoring the status, an optical output control unit for controlling the optical amplifying unit in accordance with the result of monitoring of status; and a status restoring unit for initializing the control status of the optical output control unit by initializing the computer when detecting an occurrence of the abnormal status by the result of monitoring of status and restoring the optical output control unit to the control status before occurrence of the related abnormal status within a relaxation time inherent in the optical amplifying medium occurring accompanied with this initialization.

摘要翻译： 一种计算机控制的光学放大装置，其包括具有光放大介质的光放大单元和在计算机的控制下控制光放大单元的光放大控制单元。 该光放大控制单元由用于监视状态的状态监视单元，根据状态监视的结果控制光放大单元的光输出控制单元构成; 以及状态恢复单元，用于通过初始化计算机的初始化来初始化光输出控制单元的控制状态，该状态恢复单元通过状态监视的结果检测到异常状态的发生，并且在发生之前将光输出控制单元恢复到控制状态 在与该初始化相关的光放大介质中固有的弛豫时间内的相关异常状态。

公开(公告)号：US5696859A

公开(公告)日：1997-12-09

申请号：US534726

申请日：1995-09-27

申请人： Hiroshi Onaka ,  Hideyuki Miyata ,  Nobuhiro Fukushima

发明人： Hiroshi Onaka ,  Hideyuki Miyata ,  Nobuhiro Fukushima

IPC分类号： G02B6/12 ,  G02B6/34 ,  H01S5/0687 ,  H01S5/40 ,  H04B10/00 ,  H04B10/079 ,  H04B10/25 ,  H04B10/2507 ,  H04B10/54 ,  H04B10/548 ,  H04B10/564 ,  G02B6/293

CPC分类号： G02B6/2937 ,  G02B6/12007 ,  G02B6/29317 ,  G02B6/29352 ,  G02B6/29362 ,  G02B6/29395 ,  G02B6/4246 ,  H04B10/503 ,  H04B10/506 ,  G02B2006/12107 ,  G02B2006/12109 ,  G02B2006/12164 ,  H01S5/0687 ,  H01S5/4025 ,  H01S5/4087

摘要： An optical transmitter provided by the present invention comprises: a light source; a band-pass filter for filtering a light generated by the light source; a light splitting means for splitting a light output by the band-pass filter into at least two split lights; an optical receiving unit for converting one of the split lights into an electrical signal having a level proportional to the intensity of the split light; and a control means for receiving the electrical signal for use in controlling the wavelength of the light source so as to sustain the intensity of the split light at a fixed value. With the configuration described above, fluctuations in wavelength occurring on the transmitter side can be reduced. On the top of that, by applying this optical transmitter to a WDM system, a system cold start can be done with ease.

摘要翻译： 本发明提供的光发射机包括：光源; 用于对由光源产生的光进行滤波的带通滤波器; 分光装置，用于将由带通滤光器输出的光分成至少两个分光; 光接收单元，用于将分光中的一个转换成具有与分光的强度成比例的电平的电信号; 以及控制装置，用于接收用于控制光源的波长的电信号，以将分裂光的强度维持在固定值。 利用上述配置，可以减少在发送器侧发生的波长波动。 最重要的是，通过将该光发射机应用于WDM系统，可以轻松完成系统冷启动。

公开(公告)号：US5596448A

公开(公告)日：1997-01-21

申请号：US492899

申请日：1995-06-20

申请人： Hiroshi Onaka ,  Motoyoshi Sekiya

发明人： Hiroshi Onaka ,  Motoyoshi Sekiya

IPC分类号： G02F1/35 ,  G02B6/34 ,  H01S3/067 ,  H01S3/23 ,  H01S3/00 ,  G02B6/26

CPC分类号： G02B6/274 ,  G02B6/278 ,  G02B6/29374 ,  H01S3/06758 ,  H01S3/06712 ,  H01S3/06725 ,  H01S3/2333

摘要： A dispersion compensator of the present invention includes a dispersion compensation fiber and a polarization conversion mirror. The dispersion compensation fiber has color dispersion of a sign opposite to the sign of the color dispersion of the optical fiber transmission line, and the length thereof is set so as to conform to the value of the color dispersion of the optical fiber transmission line. Light propagating in the optical fiber transmission line then propagates in the dispersion compensation fiber from a first end toward a second end of it and is supplied to the polarization conversion mirror. The light supplied to the polarization conversion mirror is converted into light of a polarization condition orthogonal and time-reversed to the polarization condition of the light supplied to the polarization conversion mirror, and propagates in the dispersion compensation fiber from the second end toward the first end of it. This enables compensation not only for color dispersion but also for polarization mode dispersion.

摘要翻译： 本发明的色散补偿器包括色散补偿光纤和偏振转换镜。 色散补偿光纤具有与光纤传输线的色散符号相反的符号的色散，并且其长度被设定为符合光纤传输线的色散值。 然后在光纤传输线中传播的光在色散补偿光纤中从第一端向第二端传播，并被提供给偏振转换镜。 提供给偏振转换镜的光被转换为与提供给偏振转换镜的光的偏振状态正交并时间反转的偏振条件的光，并且在色散补偿光纤中从第二端向第一端传播 的。 这不仅可以补偿色散，还可以进行偏振模色散。

公开(公告)号：US5426502A

公开(公告)日：1995-06-20

申请号：US138083

申请日：1993-10-20

申请人： Hideyuki Miyata ,  Hiroshi Onaka ,  Yoshihto Onoda

发明人： Hideyuki Miyata ,  Hiroshi Onaka ,  Yoshihto Onoda

IPC分类号： G01J9/00 ,  G01J9/02 ,  G01B9/02

CPC分类号： G01J9/02

摘要： The invention provides an optical wavelength/frequency detection apparatus for detecting a wavelength of a frequency of a laser source, which is improved in that it eliminates a movable element to achieve a high degree of long term reliability and can detect a wavelength or a frequency of light with a high degree of accuracy with a high resolution while it is small in size. The optical wavelength/frequency detection apparatus comprises a pair of optical fibers for individually propagating two optical outputs of a measurement light splitting optical coupler, a driver for varying the relative difference between optical path lengths of two beams of light propagated in the optical fibers, a light receiver for receiving interference light of the measurement light from a measurement light combining optical coupler, and a counter for counting the number of interference pulses of the measurement light received by the light receiver. Measurement light information from the counter and reference light information are processed by comparison calculation processing to calculate a wavelength or a frequency of the measurement light.

摘要翻译： 本发明提供了一种用于检测激光源频率的波长的光波长/频率检测装置，其改进在于消除可移动元件以实现高度的长期可靠性，并且可以检测波长或频率 光线具有高精度，高分辨率，而体积小。 光波长/频率检测装置包括用于分别传播测量分光光耦合器的两个光输出的一对光纤，用于改变在光纤中传播的两束光的光路长度之间的相对差的驱动器， 用于接收来自测量光组合光耦合器的测量光的干涉光的光接收器，以及用于对由光接收器接收的测量光的干扰脉冲数进行计数的计数器。 通过比较计算处理来处理来自计数器的测量光信息和参考光信息，以计算测量光的波长或频率。

公开(公告)号：US5050176A

公开(公告)日：1991-09-17

申请号：US540284

申请日：1990-06-19

申请人： Takao Naito ,  Terumi Chikama ,  Shigeki Watanabe ,  Tetsuya Kiyonaga ,  Hiroshi Onaka ,  Yoshihito Onoda

发明人： Takao Naito ,  Terumi Chikama ,  Shigeki Watanabe ,  Tetsuya Kiyonaga ,  Hiroshi Onaka ,  Yoshihito Onoda

IPC分类号： H01S3/10 ,  H04B10/516 ,  H04B10/556 ,  H04B10/61 ,  H04L27/20 ,  H04L27/22 ,  H04L27/227 ,  H04L27/233

CPC分类号： H04L27/2331 ,  H04B10/50 ,  H04B10/504 ,  H04B10/5561 ,  H04B10/60 ,  H04B10/64 ,  H04L27/2096 ,  H04L27/223 ,  H04L27/2276

摘要： A direct modulation PSK system and method, in a coherent optical fiber transmission system, in which an injection current supplied to a laser diode is adapted to be directly varied is disclosed. In this system or method, a modulating current pulse is superposed on a bias current for the laser diode so that a specified phase condition may be satisfied. Thereby, a differential coding circuit and an external modulator being indispensable for a DPSK system become unnecessary and, in addition, the system becomes less susceptible to the influence of wavelength dispersion than the DPSK system and able to reproduce the carrier.