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    Optical pulse position detecting circuit and an optical pulse generating apparatus and their methods
    2.
    发明授权
    Optical pulse position detecting circuit and an optical pulse generating apparatus and their methods 失效
    光脉冲位置检测电路及光脉冲发生装置及其方法

    公开(公告)号：US06236488B1

    公开(公告)日：2001-05-22

    申请号：US09052072

    申请日：1998-03-31

    申请人： Katsuhiro Shimizu ,  Takashi Mizuochi ,  Takeshi Komiya ,  Kiwami Matsushita ,  Tadayoshi Kitayama ,  Masatoshi Suzuki ,  Hidenori Taga ,  Shu Yamamoto ,  Noboru Edagawa ,  Itsuro Morita

    发明人： Katsuhiro Shimizu ,  Takashi Mizuochi ,  Takeshi Komiya ,  Kiwami Matsushita ,  Tadayoshi Kitayama ,  Masatoshi Suzuki ,  Hidenori Taga ,  Shu Yamamoto ,  Noboru Edagawa ,  Itsuro Morita

    IPC分类号： H04B1004

    CPC分类号： G02F1/0327 ,  G01J11/00 ,  G02F2203/26 ,  H04J14/08

    摘要： Detection of an optical pulse position uses an optical pulse string with a determined repetitive ratio and an electric clock signal with a same frequency as the repetitive ratio of the optical pulse string. A phase of the electric clock signal oscillator is shifted and supplied to an optical modulator. The optical modulator modulates the optical pulse string based on the electric clock signal and outputs a modulated optical signal. A photo detector converts the modulated optical signal output from the optical modulator to an electric signal. The phase shift amount of the electric clock signal is controlled to maximize an output from the photo detector. Additionally, a dither signal may be used in the control of the phase shift, more than the optical modulator may be employed, and/or more than color light source may be employed. The use of at least one of feed forward and feedback control provided by maximizing an output of the photo detector allows an optical pulse having a short width to be realized.

    摘要翻译： 光脉冲位置的检测使用具有确定的重复比率的光脉冲串和具有与光脉冲串的重复比相同频率的电时钟信号。 电时钟信号振荡器的相位移位并提供给光调制器。 光调制器基于电时钟信号调制光脉冲串，并输出调制光信号。 光检测器将从光调制器输出的调制光信号转换为电信号。 控制电时钟信号的相移量使光检测器的输出最大化。 另外，抖动信号可以用于相移的控制，可以采用多于光调制器，和/或多于彩色光源。 使用通过使光检测器的输出最大化而提供的前馈和反馈控制中的至少一个允许实现具有短宽度的光脉冲。

    Optical amplifying-repeating transmission system
    3.
    发明授权
    Optical amplifying-repeating transmission system 失效
    光放大重复传输系统

    公开(公告)号：US5629795A

    公开(公告)日：1997-05-13

    申请号：US521973

    申请日：1995-08-31

    申请人： Masatoshi Suzuki ,  Itsuro Morita ,  Shu Yamamoto ,  Noboru Edagawa ,  Hidenori Taga ,  Shigeyuki Akiba

    发明人： Masatoshi Suzuki ,  Itsuro Morita ,  Shu Yamamoto ,  Noboru Edagawa ,  Hidenori Taga ,  Shigeyuki Akiba

    IPC分类号： H04B10/2507 ,  H04B10/2525 ,  H04B10/29 ,  H04B10/291 ,  H01S3/00 ,  H04B10/02

    CPC分类号： H04B10/25253

    摘要： An optical amplifying-repeating transmission system is disclosed which is composed of an optical fiber for transmitting a lightwave signal with digital information added to return-to-zero lightwave pulses and a plurality of optical amplifying repeaters inserted in the optical fiber for transmission use. The mean value of wavelengths at which the wavelength dispersion of the optical fiber is zero is smaller than the wavelength of the lightwave signal which is transmitted over the system. The accumulated wavelength dispersion value of the optical fiber tends to increase with the distance of transmission, from a macroscopic viewpoint. The optical fiber for transmission is divided into a plurality of sections. In accordance with the accumulated wavelength dispersion value of the optical fiber in each section except at least the last one, a wavelength dispersion medium, which locally changes the wavelength dispersion in a manner to cancel the accumulated wavelength dispersion in the section at the wavelength of the lightwave signal, is inserted in the section to eliminate the accumulation of the timing jitter.

    摘要翻译： 公开了一种光放大重复传输系统，其由用于传输光波信号的光纤与添加到归零光波脉冲的数字信息以及插入光纤中的多个光放大中继器组成，用于传输使用。 光纤的波长色散为零的波长的平均值小于在系统上传输的光波信号的波长。 从宏观的观点来看，光纤的累积波长色散值随着透射距离而增加。 用于传输的光纤被分成多个部分。 根据除了至少最后一个部分之外的每个部分中的光纤的累积波长色散值，波长色散介质以局部改变波长色散的方式来消除在波长的波长处的部分中的累积波长色散 光波信号，插入该部分以消除定时抖动的累积。

    Optical transmission system
    4.
    发明授权
    Optical transmission system 失效
    光传输系统

    公开(公告)号：US5642215A

    公开(公告)日：1997-06-24

    申请号：US521952

    申请日：1995-08-31

    申请人： Masatoshi Suzuki ,  Itsuro Morita ,  Noboru Edagawa ,  Hidenori Taga ,  Shu Yamamoto ,  Shigeyuki Akiba

    发明人： Masatoshi Suzuki ,  Itsuro Morita ,  Noboru Edagawa ,  Hidenori Taga ,  Shu Yamamoto ,  Shigeyuki Akiba

    IPC分类号： G02F1/35 ,  H01S3/10 ,  H04B10/2507 ,  H04B10/508 ,  H04B10/524 ,  H04B10/58 ,  H04B10/00

    CPC分类号： H04B10/25077

    摘要： An optical transmission system which permits long-distance, ultrafast, high-capacity optical soliton transmission by suppressing timing jitter with simple means. In an optical transmission system which uses a transmission line composed of an optical fiber for transmitting therethrough a lightwave signal having digital information added to a return-to-zero lightwave pulse and a plurality of optical amplifying repeaters for compensating for losses by the optical fiber and in which the pulse compression effect by the nonlinear optical effect on the optical pulse and the pulse expansion effect by the dispersion effect are compensated, at least one optical band limited element which has a flat group delay characteristic near the center frequency is disposed in the transmission line at intervals of a period Z equal to the soliton period Z.sub.sol and the product, aB.sub.sol.spsb.2, of the curvature a of the product of the intensity transfer funtions of the optical band limited elements in the vicinity of the center frequency in the soliton period and the square of the full width at half maximum, B.sub.sol, of the spectrum of the lightwave pulse to be transmitted is set to a value in the range of 2.1.times.10.sup.-2 to 8.3.times.10.sup.-2.

    摘要翻译： 一种光传输系统，通过简单的手段抑制定时抖动，允许长距离，超快速，高容量的光孤子传输。 在光传输系统中，使用由光纤组成的传输线通过其传输具有添加到归零光波脉冲的数字信息的光波信号和用于补偿光纤损耗的多个光放大中继器，以及 其中通过非线性光学效应对光脉冲的脉冲压缩效应和由色散效应产生的脉冲扩展效应被补偿，至少一个在中心频率附近具有平坦组延迟特性的光学带限制元件设置在透射 以等于孤子周期Zsol的周期Z的间隔和在孤子周期中的中心频率附近的光学带限制元件的强度转移功率的乘积的曲率a的乘积aBsol2，以及 要发送的光波脉冲的频谱的半峰全宽Bsol被设定为t o在2.1×10-2至8.3×10-2的范围内的值。

    Optical amplifying transmitting system
    5.
    发明授权
    Optical amplifying transmitting system 失效
    光放大传输系统

    公开(公告)号：US5574590A

    公开(公告)日：1996-11-12

    申请号：US521838

    申请日：1995-08-31

    申请人： Noboru Edagawa ,  Masatoshi Suzuki ,  Hidenori Taga ,  Itsuro Morita ,  Shu Yamamoto ,  Shigeyuki Akiba

    发明人： Noboru Edagawa ,  Masatoshi Suzuki ,  Hidenori Taga ,  Itsuro Morita ,  Shu Yamamoto ,  Shigeyuki Akiba

    IPC分类号： G02F1/35 ,  H04B10/2507 ,  H04B10/2513 ,  H04B10/29 ,  H04B10/291 ,  H04B10/508 ,  H04B10/524 ,  H04B10/58 ,  H04B10/16 ,  H04B10/12

    CPC分类号： H04B10/2935 ,  H04B10/25253

    摘要： An optical amplifying transmission system is disclosed in which a large quantity of optical fiber whose zero dispersion wavelength is longer than the wavelength of the lightwave signal is introduced to provide an RZ lightwave signal transmission system. In this system, the average zero dispersion wavelength by the optical fiber is shorter than the wavelength of the lightwave signal, the zero dispersion wavelength by the optical fiber whose length is in the range of one-thirds to two-thirds of the entire length of the optical fiber is longer than the wavelength of the lightwave signal, and the absolute value of the wavelength dispersion is larger than one-half the absolute value of the average wavelength dispersion value over the entire length of the optical fiber.

    摘要翻译： 公开了一种光放大传输系统，其中引入了零色散波长比光波信号的波长长的大量光纤，以提供RZ光波信号传输系统。 在该系统中，光纤的平均零色散波长比光波信号的波长短，其长度为全长的三分之一到三分之二的光纤的零色散波长 光纤比光波信号的波长长，波长色散的绝对值大于光纤的整个长度上的平均波长色散值的绝对值的一半。

    Gain-controllable optical amplifier and optical gain-control method
    7.
    发明授权
    Gain-controllable optical amplifier and optical gain-control method 失效
    增益可控光放大器和光增益控制方法

    公开(公告)号：US5710660A

    公开(公告)日：1998-01-20

    申请号：US606653

    申请日：1996-02-26

    申请人： Shu Yamamoto ,  Hidenori Taga ,  Noboru Edagawa ,  Shigeyuki Akiba ,  Kuniaki Motoshima ,  Katsumi Takano ,  Tadayoshi Kitayama

    发明人： Shu Yamamoto ,  Hidenori Taga ,  Noboru Edagawa ,  Shigeyuki Akiba ,  Kuniaki Motoshima ,  Katsumi Takano ,  Tadayoshi Kitayama

    IPC分类号： G02F1/35 ,  H01S3/06 ,  H01S3/067 ,  H01S3/07 ,  H01S3/13 ,  H01S3/131 ,  H01S3/00 ,  C02B6/00

    CPC分类号： H04B10/2931 ,  H01S3/06758 ,  H01S3/1301

    摘要： This invention provides an optical amplifier which has low noise characteristics for a wide range of input signal electric power. The optical amplifier has a plurality of cascaded optical amplifying units, a signal level detector, and a pump-source controller. The pump-source controller changes controlling objects from a pump-source corresponding to a first one of the optical amplifying units to a pump-source corresponding to a second one of the optical amplifying units according to a detection level of the signal level detector from a low level to a high level. When the detection level is outside of a control object range, the optical amplifier controls an output from the pump-source to stabilize. When the detection level is within the control object range, the optical amplifier controls an output from a pump-source of each of optical amplifying units according to the detection level.

    摘要翻译： 本发明提供一种对于宽范围的输入信号电力具有低噪声特性的光放大器。 光放大器具有多个级联的光放大单元，信号电平检测器和泵源控制器。 泵源控制器根据来自信号电平检测器的检测电平，将对应于第一光放大单元的泵浦源的控制对象改变为对应于第二光放大单元的泵浦源 低水平到高水平。 当检测电平超出控制对象范围时，光放大器控制泵源的输出稳定。 当检测水平处于控制对象范围内时，光放大器根据检测水平控制每个光放大单元的泵浦源的输出。

    Optical pulse generator
    10.
    发明授权
    Optical pulse generator 失效
    光脉冲发生器

    公开(公告)号：US5898714A

    公开(公告)日：1999-04-27

    申请号：US783589

    申请日：1997-01-13

    申请人： Itsuro Morita ,  Noboru Edagawa ,  Masatoshi Suzuki ,  Shu Yamamoto ,  Shigeyuki Akiba

    发明人： Itsuro Morita ,  Noboru Edagawa ,  Masatoshi Suzuki ,  Shu Yamamoto ,  Shigeyuki Akiba

    IPC分类号： G02F1/35 ,  H01S3/30 ,  H04B10/2507 ,  H04B10/2525 ,  H04B10/29 ,  H04B10/293 ,  H04B10/508 ,  H04B10/524

    CPC分类号： H01S3/302 ,  H01S2301/085

    摘要： An optical pulse generator, capable of generating ultrashort optical pulses suitable for optical soliton transmission, includes a DFB laser 10 for continuous laser oscillation, an electroabsorbtion modulator 12 for creating a sequence of optical pulses of the pulse width 14.6 ps from optical output of the laser 10. Output from an optical modulator 12 enters into a dispersion decreasing fiber 16 via an optical isolator 14. The dispersion decreasing fiber 16 has chromatic dispersion that decreases from 13.7 ps/nm/km to 2.3 ps/nm/km with distance, and its fiber length is 15 km. Pump laser beams from pump lasers 20, 24 are introduced to the dispersion decreasing fiber 16 by optical couplers 18, 22, and the fiber 16 functions as a Raman amplifier. When the Raman gain is 2.4 dB, the pulse width is compressed from 14.6 ps to 5.8 ps, approximately, even when the power of input pulses to the dispersion decreasing fiber 16 complies with the soliton condition.

    摘要翻译： 能够产生适用于光孤子传输的超短光脉冲的光脉冲发生器包括用于连续激光振荡的DFB激光器10，用于从激光器的光输出产生脉冲宽度为14.6ps的光脉冲序列的电吸收调制器12 来自光调制器12的输出经由光隔离器14进入色散减小的光纤16.色散减小光纤16具有从距离13.7ps / nm / km降低到2.3ps / nm / km的色散，并且其色散 纤维长度为15公里。 来自泵浦激光器20,24的泵浦激光束通过光耦合器18,22引入到色散减小光纤16，并且光纤16用作拉曼放大器。 当拉曼增益为2.4dB时，即使当色散减小的光纤16的输入脉冲的功率符合孤子条件时，脉冲宽度也从大约14.6ps压缩到5.8ps。