公开(公告)号：US07769298B2

公开(公告)日：2010-08-03

申请号：US12238065

申请日：2008-09-25

Applicant: Koji Igarashi ,  Yoshihiro Emori ,  Atsushi Oguri ,  Shu Namiki ,  Osamu Aso ,  Masateru Tadakuma

Inventor： Koji Igarashi ,  Yoshihiro Emori ,  Atsushi Oguri ,  Shu Namiki ,  Osamu Aso ,  Masateru Tadakuma

IPC: H04B10/12

CPC classification number: G02F1/365 ,  G02F1/3513 ,  G02F2203/17 ,  G02F2203/26 ,  H01S5/0623 ,  H04B10/25077 ,  H04B10/291

Abstract: The present invention provides a pulse train generator comprising: a dual-frequency signal light source for generating a dual-frequency signal; a soliton shaper for soliton-shaping output light from the dual-frequency signal light source; and an adiabatic soliton compressor for performing adiabatic soliton compression on output light from the soliton shaper, and also provides a waveform shaper used in this pulse train generator, including a plurality of highly nonlinear optical transmission lines and a plurality of low-nonlinearity optical transmission lines which has a nonlinearity coefficient lower than that of the plurality of highly nonlinear optical transmission lines and which has a second-order dispersion value of which an absolute value is different from that of the plurality of highly nonlinear optical transmission lines. Further, the present invention provides a light source comprising a plurality of continuous light sources of which at least one oscillates in a multimode; a multiplexer for multiplexing output light from the continuous light sources; and a nonlinear phenomenon producer for producing a nonlinear phenomenon on output light from the multiplexer so as to suppress SBS (Stimulated Brillouin Scattering).

Abstract translation: 本发明提供一种脉冲串发生器，包括：用于产生双频信号的双频信号光源; 用于孤子整形的孤子整形器来自双频信号光源的输出光; 以及用于对来自孤子整形器的输出光进行绝热孤子压缩的绝热孤子压缩器，并且还提供在该脉冲串发生器中使用的波形整形器，包括多个高度非线性的光传输线和多个低非线性光传输线 其具有比多个高度非线性光传输线的非线性系数低的非线性系数，并且具有绝对值与多个高度非线性光传输线的绝对值不同的二阶色散值。 此外，本发明提供了一种光源，其包括至少一个以多模振荡的多个连续光源; 多路复用器，用于复用来自连续光源的输出光; 以及用于在来自多路复用器的输出光上产生非线性现象以抑制SBS（受激布里渊散射）的非线性现象产生器。

公开(公告)号：US07408701B2

公开(公告)日：2008-08-05

申请号：US11407141

申请日：2006-04-20

Applicant: Osamu Aso ,  Shunichi Matushita ,  Misao Sakano ,  Masateru Tadakuma

Inventor： Osamu Aso ,  Shunichi Matushita ,  Misao Sakano ,  Masateru Tadakuma

IPC: G02F1/35 ,  G02F1/39 ,  H04J14/02

CPC classification number: G02F1/3536 ,  G02F2/004 ,  G02F2201/16 ,  G02F2203/58 ,  H01S5/041 ,  H01S5/50 ,  H01S5/5054 ,  H04B10/29 ,  H04B10/505 ,  H04B10/506 ,  H04B10/572 ,  H04J14/02

Abstract: A multi-frequency light producing method and apparatus multiplies the number of optical channels present in an incident wavelength division multiplexed (WDM) signal light source by four-wave mixing (FWM) the WDM signal with at least one pump lightwave at least one time. By FWM the WDM light and a pump lightwave multiple times, wherein each FWM process is executed with a pump lightwave having a different frequency, either in series or parallel, the number of optical channels produced as a result of FWM effectively increases the number of optical channels present in addition to those from the WDM signal. The light producing method and apparatus can be employed in a telecommunications system as a an inexpensive light source producing a plurality of optical frequencies.

Abstract translation: 多频光产生方法和装置通过四波混频（FWM）将入射波分复用（WDM）信号光源中存在的光通道的数量与至少一个泵浦光波至少一次相乘。 通过FWM WDM光和泵浦光波多次，其中每个FWM处理都是以具有不同频率的泵浦光波串联或并联执行的，由FWM产生的光通道数量有效地增加了光学数 除了来自WDM信号的信道之外还存在通道。 该光产生方法和装置可以用在电信系统中，作为产生多个光频率的廉价光源。

公开(公告)号：US07146085B2

公开(公告)日：2006-12-05

申请号：US11249808

申请日：2005-10-13

Applicant: Masateru Tadakuma ,  Yu Mimura ,  Misao Sakano ,  Osamu Aso ,  Takeshi Nakajima ,  Katsutoshi Takahashi

Inventor： Masateru Tadakuma ,  Yu Mimura ,  Misao Sakano ,  Osamu Aso ,  Takeshi Nakajima ,  Katsutoshi Takahashi

IPC: G02B6/00 ,  G01N21/00

CPC classification number: G01M11/3172 ,  G01M11/31 ,  G01M11/3181 ,  G01M11/319 ,  G01M11/39

Abstract: A method of simultaneously specifying the wavelength dispersion and nonlinear coefficient of an optical fiber. Pulsed probe light and pulsed pump light are first caused to enter an optical fiber to be measured. Then, the power oscillation of the back-scattered light of the probe light or idler light generated within the optical fiber is measured. Next, the instantaneous frequency of the measured power oscillation is obtained, and the dependency of the instantaneous frequency relative to the power oscillation of the pump light in a longitudinal direction of the optical fiber is obtained. Thereafter, a rate of change in the longitudinal direction between phase-mismatching conditions and nonlinear coefficient of the optical fiber is obtained from the dependency of the instantaneous frequency. And based on the rate of change, the longitudinal wavelength-dispersion distribution and longitudinal nonlinear-coefficient distribution of the optical fiber are simultaneously specified.

Abstract translation: 一种同时指定光纤的波长色散和非线性系数的方法。 首先引入脉冲探头光和脉冲泵浦光，进入要测量的光纤。 然后，测量在光纤内产生的探测光或空载光的背散射光的功率振荡。 接下来，获得测量的功率振荡的瞬时频率，并且获得瞬时频率相对于光纤在纵向方向上的功率振荡的依赖性。 此后，根据瞬时频率的依赖性，获得相位不匹配条件和光纤的非线性系数之间的纵向变化率。 并且基于变化率，同时规定了光纤的纵向波长色散分布和纵向非线性系数分布。

公开(公告)号：US20060002715A1

公开(公告)日：2006-01-05

申请号：US11134275

申请日：2005-05-23

Applicant: Koji Igarashi ,  Yoshihiro Emori ,  Atsushi Oguri ,  Shu Namiki ,  Osamu Aso ,  Masateru Tadakuma

Inventor： Koji Igarashi ,  Yoshihiro Emori ,  Atsushi Oguri ,  Shu Namiki ,  Osamu Aso ,  Masateru Tadakuma

IPC: H04B10/00

CPC classification number: G02F1/365 ,  G02F1/3513 ,  G02F2203/17 ,  G02F2203/26 ,  H01S5/0623 ,  H04B10/25077 ,  H04B10/291

Abstract: The present invention provides a pulse train generator comprising: a dual-frequency signal light source for generating a dual-frequency signal; a soliton shaper for soliton-shaping output light from the dual-frequency signal light source; and an adiabatic soliton compressor for performing adiabatic soliton compression on output light from the soliton shaper, and also provides a waveform shaper used in this pulse train generator, including a plurality of highly nonlinear optical transmission lines and a plurality of low-nonlinearity optical transmission lines which has a nonlinearity coefficient lower than that of the plurality of highly nonlinear optical transmission lines and which has a second-order dispersion value of which an absolute value is different from that of the plurality of highly nonlinear optical transmission lines. Further, the present invention provides a light source comprising a plurality of continuous light sources of which at least one oscillates in a multimode; a multiplexer for multiplexing output light from the continuous light sources; and a nonlinear phenomenon producer for producing a nonlinear phenomenon on output light from the multiplexer so as to suppress SBS (Stimulated Brillouin Scattering).

Abstract translation: 本发明提供一种脉冲串发生器，包括：用于产生双频信号的双频信号光源; 用于孤子整形的孤子整形器来自双频信号光源的输出光; 以及用于对来自孤子整形器的输出光进行绝热孤子压缩的绝热孤子压缩器，并且还提供在该脉冲串发生器中使用的波形整形器，包括多个高度非线性的光传输线和多个低非线性光传输线 其具有比多个高度非线性光传输线的非线性系数低的非线性系数，并且具有绝对值与多个高度非线性光传输线的绝对值不同的二阶色散值。 此外，本发明提供了一种光源，其包括至少一个以多模振荡的多个连续光源; 多路复用器，用于复用来自连续光源的输出光; 以及用于在来自多路复用器的输出光上产生非线性现象以抑制SBS（受激布里渊散射）的非线性现象产生器。

公开(公告)号：US06831775B2

公开(公告)日：2004-12-14

申请号：US10053231

申请日：2002-01-17

Applicant: Shunichi Matsushita ,  Osamu Aso ,  Misao Sakano

Inventor： Shunichi Matsushita ,  Osamu Aso ,  Misao Sakano

IPC: G02F202

CPC classification number: H01S5/50 ,  G02F1/3536 ,  G02F2/004 ,  H01S5/041 ,  H01S5/5054 ,  H04B10/2563 ,  H04B10/29

Abstract: A wavelength converting method and apparatus which converts wavelength division multiplexed (WDM) signal light, having a plurality of channels, by four-wave mixing the WDM signal light with at least one pump lightwave. Wavelength conversion of the WDM signal is accomplished without producing noise by FWM the WDM signal with a pump lightwave, wherein the pump lightwave frequency is separated from the WDM signal by an interval equal to or greater than the bandwidth of the WDM signal. Two pump lightwaves can be used instead of one, wherein one of the pump lightwaves has a frequency on one side of the bandwidth of the WDM signal, and the average frequency of the two pump lightwaves is on the other side of the WDM signal bandwidth.

Abstract translation: 一种波长转换方法和装置，其通过将WDM信号光与至少一个泵浦光波进行四波混频来转换具有多个通道的波分复用（WDM）信号光。 WDM信号的波长转换通过FWM产生具有泵浦光波的WDM信号的噪声，其中泵浦光波频率与WDM信号分离等于或大于WDM信号的带宽的间隔。 可以使用两个泵浦波，而不是一个泵浦光波，其中一个泵浦光波在WDM信号的带宽的一侧具有频率，并且两个泵浦光波的平均频率在WDM信号带宽的另一侧。

公开(公告)号：US06522818B1

公开(公告)日：2003-02-18

申请号：US09536713

申请日：2000-03-28

Applicant: Osamu Aso ,  Masateru Tadakuma ,  Shu Namiki

Inventor： Osamu Aso ,  Masateru Tadakuma ,  Shu Namiki

IPC: G02B600

CPC classification number: G02B6/29376 ,  G02B6/278 ,  G02F1/3536 ,  G02F2201/02

Abstract: The present invention provides a method for generating four-wave mixing to obtain idler light with high efficiency, in which the range of lengths of an optical fiber is appropriately set, and probe light and pumping light, having different frequencies, are launched into the optical fiber. When the nonlinear coefficient of the optical fiber, the loss per unit distance, and the wavelength and intensity of the probe light and pumping light are set to certain values, the idler light conversion efficiency at the output end of the optical fiber is a periodic function with respect to optical fiber length having a maximal value and a minimal value. The maximum length of the optical fiber to be used to obtain four-wave mixing is set to be equal to or less than the length Lmax (Lmax=Lm+&Dgr;L) which is given by adding the length of the optical fiber Lm, at which the idler light conversion efficiency takes on the first maximal value in the aforementioned periodic function and distance &Dgr;L or 10% of Lm.

Abstract translation: 本发明提供了一种用于产生四波混频的方法，以高效率获得惰性光，其中适当地设置光纤的长度范围，并且将具有不同频率的探测光和泵浦光发射到光学 纤维。 当光纤的非线性系数，每单位距离的损耗以及探测光和泵浦光的波长和强度被设置为一定值时，光纤输出端的惰轮光转换效率是周期性函数 相对于具有最大值和最小值的光纤长度。 用于获得四波混频的光纤的最大长度被设定为等于或小于通过将光纤Lm的长度相加给出的长度Lmax（Lmax = Lm + DELTAL），其中 空转光转换效率在上述周期函数和距离DELTAL或Lm的10％中具有第一最大值。

公开(公告)号：US06377390B1

公开(公告)日：2002-04-23

申请号：US09486562

申请日：2000-03-03

Applicant: Kazuyo Mizuno ,  Shyoichi Ozawa ,  Osamu Aso ,  Shu Namiki ,  Ikuo Ohta ,  Yuichiro Irie

Inventor： Kazuyo Mizuno ,  Shyoichi Ozawa ,  Osamu Aso ,  Shu Namiki ,  Ikuo Ohta ,  Yuichiro Irie

IPC: H01S300

CPC classification number: H04B10/2941 ,  H01S3/06754 ,  H01S3/06758 ,  H01S3/10023 ,  H01S2301/04 ,  H04J14/0221

Abstract: In an optical gain equalizer according to the present invention, a plurality of etalon filters 1 and one ore more fiber gratings 2 or dielectric multilayer filters 3 are arranged in line, and a beam of light externally applied is passed through the etalon filters 1 and the fiber gratings 2 or dielectric multilayer filters 3 and outputted to the outside, and the etalon filters 1 have sinusoidal wave loss characteristic of the same amplitude and period as those of the term obtained by Fourier series expansion of the loss wavelength characteristic for gain flattening, and the one or more fiber gratings 2 or dielectric multilayer filters 3 compensate the ripple component remaining as the difference between the loss wavelength characteristic for gain flattening and the loss wavelength characteristic owing to the etalon filters 1. An optical amplifying device 14 is constituted by combining an optical amplifier 5 with the optical gain equalizer 4. A wavelength-division multiplex transmitter is constituted by using the optical amplifying device 14.

Abstract translation: 在根据本发明的光学增益均衡器中，多个标准具滤光器1和一个以上的光纤光栅2或电介质多层滤光器3排列成一列，外部施加的光束通过标准具过滤器1和 光纤光栅2或电介质多层滤波器3并输出到外部，并且标准具滤波器1具有与通过用于增益平坦化的损耗波长特性的傅立叶级数扩展获得的项相同的振幅和周期的正弦波损耗特性， 一个或多个光纤光栅2或电介质多层滤波器3补偿作为增益平坦化的损耗波长特性与由标准具滤波器1引起的损耗波长特性之间的差异剩余的纹波分量。光放大装置14是将 具有光学增益均衡器的光放大器5 通过使用光放大装置14构成。

公开(公告)号：US07424191B2

公开(公告)日：2008-09-09

申请号：US11580473

申请日：2006-10-13

Applicant: Masateru Tadakuma ,  Yu Mimura ,  Misao Sakano ,  Osamu Aso ,  Takeshi Nakajima ,  Katsutoshi Takahashi

Inventor： Masateru Tadakuma ,  Yu Mimura ,  Misao Sakano ,  Osamu Aso ,  Takeshi Nakajima ,  Katsutoshi Takahashi

IPC: G02B6/00 ,  H04B10/08 ,  H04B17/00 ,  G01N21/00

CPC classification number: G01M11/3172 ,  G01M11/31 ,  G01M11/3181 ,  G01M11/319 ,  G01M11/39

Abstract: A method of simultaneously specifying the wavelength dispersion and nonlinear coefficient of an optical fiber. Pulsed probe light and pulsed pump light are first caused to enter an optical fiber to be measured. Then, the power oscillation of the back-scattered light of the probe light or idler light generated within the optical fiber is measured. Next, the instantaneous frequency of the measured power oscillation is obtained, and the dependency of the instantaneous frequency relative to the power oscillation of the pump light in a longitudinal direction of the optical fiber is obtained. Thereafter, a rate of change in the longitudinal direction between phase-mismatching conditions and nonlinear coefficient of the optical fiber is obtained from the dependency of the instantaneous frequency. And based on the rate of change, the longitudinal wavelength-dispersion distribution and longitudinal nonlinear-coefficient distribution of the optical fiber are simultaneously specified.

Abstract translation: 一种同时指定光纤的波长色散和非线性系数的方法。 首先引入脉冲探头光和脉冲泵浦光，进入要测量的光纤。 然后，测量在光纤内产生的探测光或空载光的背散射光的功率振荡。 接下来，获得测量的功率振荡的瞬时频率，并且获得瞬时频率相对于光纤在纵向方向上的功率振荡的依赖性。 此后，根据瞬时频率的依赖性，获得相位不匹配条件和光纤的非线性系数之间的纵向变化率。 并且基于变化率，同时规定了光纤的纵向波长色散分布和纵向非线性系数分布。

公开(公告)号：US20050058417A1

公开(公告)日：2005-03-17

申请号：US10832875

申请日：2004-04-27

Applicant: Masateru Tadakuma ,  Yu Mimura ,  Misao Sakano ,  Osamu Aso ,  Takeshi Nakajima ,  Katsutoshi Takahashi

Inventor： Masateru Tadakuma ,  Yu Mimura ,  Misao Sakano ,  Osamu Aso ,  Takeshi Nakajima ,  Katsutoshi Takahashi

IPC: G01M11/00 ,  G02B6/02 ,  H04B10/08 ,  H04B10/18

CPC classification number: G01M11/3172 ,  G01M11/31 ,  G01M11/3181 ,  G01M11/319 ,  G01M11/39

Abstract: A method of simultaneously specifying the wavelength dispersion and nonlinear coefficient of an optical fiber. Pulsed probe light and pulsed pump light are first caused to enter an optical fiber to be measured. Then, the power oscillation of the back-scattered light of the probe light or idler light generated within the optical fiber is measured. Next, the instantaneous frequency of the measured power oscillation is obtained, and the dependency of the instantaneous frequency relative to the power oscillation of the pump light in a longitudinal direction of the optical fiber is obtained. Thereafter, a rate of change in the longitudinal direction between phase-mismatching conditions and nonlinear coefficient of the optical fiber is obtained from the dependency of the instantaneous frequency. And based on the rate of change, the longitudinal wavelength-dispersion distribution and longitudinal nonlinear-coefficient distribution of thee optical fiber are simultaneously specified.

Abstract translation: 一种同时指定光纤的波长色散和非线性系数的方法。 首先引入脉冲探头光和脉冲泵浦光，进入要测量的光纤。 然后，测量在光纤内产生的探测光或空载光的背散射光的功率振荡。 接下来，获得测量的功率振荡的瞬时频率，并且获得瞬时频率相对于光纤在纵向方向上的功率振荡的依赖性。 此后，根据瞬时频率的依赖性，获得相位不匹配条件和光纤的非线性系数之间的纵向变化率。 并根据变化率，同时规定了光纤的纵向波长色散分布和纵向非线性系数分布。

公开(公告)号：US5965874A

公开(公告)日：1999-10-12

申请号：US807870

申请日：1997-02-26

Applicant: Osamu Aso ,  Isamu Ohshima ,  Haruki Ogoshi

Inventor： Osamu Aso ,  Isamu Ohshima ,  Haruki Ogoshi

IPC: G01J4/00 ,  G01J4/04 ,  G01M11/00 ,  G01N21/21 ,  G02F1/01

CPC classification number: G01J4/00 ,  G01J4/04 ,  G01M11/336 ,  G01M11/337 ,  G01N21/21

Abstract: A method to obtain polarization characteristics of an optical transmission medium is disclosed. Sequentially plural different states of polarized light are launched into the optical transmission medium. Intensities of light emerging from the optical transmission medium through combinations of optical elements are measured to obtain Stokes parameters from which Stokes vectors describing the emerging light corresponding to each of the plural sequentially launched states of polarization are obtained; for at least three different launched states of polarization, descriptors are used of these launched states of polarization and the Stokes vectors describing the corresponding emerging light to calculate a Jones matrix which mathematically models the changes that the launched light when described in terms of a Jones vector is subject to when passing through the optical transmission medium; and, the Jones matrix is used to describe the polarization characteristics of the optical transmission medium.

Abstract translation: 公开了一种获得光传输介质的偏振特性的方法。 顺序地将多个不同的偏振光状态发射到光传输介质中。 测量通过光学元件的组合从光传输介质出射的光的强度，以获得斯托克斯参数，从其中获得描述与多个顺序发射的极化状态中的每一个相对应的出射光的斯托克斯矢量; 对于至少三种不同的发射极化状态，使用这些发射的极化状态的描述符，并且描述相应的出射光的斯托克斯矢量来计算琼斯矩阵，该矩阵在以Jones矢量描述时对发射的光进行数学模拟 经过光传输介质时经受; 并且，Jones矩阵用于描述光传输介质的偏振特性。