公开(公告)号：US5965874A

公开(公告)日：1999-10-12

申请号：US807870

申请日：1997-02-26

申请人： Osamu Aso ,  Isamu Ohshima ,  Haruki Ogoshi

发明人： Osamu Aso ,  Isamu Ohshima ,  Haruki Ogoshi

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

CPC分类号： G01J4/00 ,  G01J4/04 ,  G01M11/336 ,  G01M11/337 ,  G01N21/21

摘要： 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.

摘要翻译： 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。

公开(公告)号：US06377390B1

公开(公告)日：2002-04-23

申请号：US09486562

申请日：2000-03-03

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

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

IPC分类号： H01S300

CPC分类号： H04B10/2941 ,  H01S3/06754 ,  H01S3/06758 ,  H01S3/10023 ,  H01S2301/04 ,  H04J14/0221

摘要： 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.

摘要翻译： 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：US07061664B2

公开(公告)日：2006-06-13

申请号：US10688197

申请日：2003-10-17

申请人： Osamu Aso ,  Shu Namiki ,  Kouki Sato ,  Hijiri Nimura

发明人： Osamu Aso ,  Shu Namiki ,  Kouki Sato ,  Hijiri Nimura

IPC分类号： G02F1/365 ,  G02F1/39

CPC分类号： H04B10/299 ,  G02F1/3536 ,  G02F2/004 ,  H04B10/2563 ,  H04J14/02 ,  H04J14/0201 ,  H04J14/0213

摘要： A wavelength converter using difference frequency generation (DFG) is disclosed. In one embodiment, the wavelength converter comprises (a) a first optical filter configured to filter out one or more lightwaves requiring wavelength conversion from wavelength-division multiplexed (WDM) lightwaves, and (b) a broadband multi-channel simultaneous wavelength conversion portion comprising a pump source that generates pump light for use in the process of the DFG, a first optical combiner for combining said pump light with said filtered lightwaves, a high non-linear medium configured to generate wavelength converted lightwaves from said filtered lightwaves using the DFG, and a second optical filter for filtering said wavelength converted from said filtered lightwaves.

摘要翻译： 公开了使用差频产生（DFG）的波长转换器。 在一个实施例中，波长转换器包括（a）第一滤光器，被配置为从波分复用（WDM）光波滤出需要波长转换的一个或多个光波，以及（b）宽带多通道同时波长转换部分，包括 产生用于DFG过程中的泵浦光的泵浦源，用于将所述泵浦光与所述经滤波的光波组合的第一光合并器，配置为使用所述DFG从所述滤波的光波产生波长转换的光波的高非线性介质， 以及第二滤光器，用于对从所述滤波光波转换的所述波长进行滤波。

公开(公告)号：US06459525B1

公开(公告)日：2002-10-01

申请号：US09656755

申请日：2000-09-07

申请人： Osamu Aso ,  Shu Namiki

发明人： Osamu Aso ,  Shu Namiki

IPC分类号： G02F135

CPC分类号： G02F1/39 ,  G02F1/3536 ,  G02F2/004

摘要： A wavelength of pump is set to an anomalous dispersion area of an optical fiber for wavelength conversion and pump power is set to be larger than a predetermined threshold of MI so that wavelength conversion capable of flattening conversion efficiency spectrum within a wide bandwidth is permitted. A pumping source can oscillate a lightwave having a wavelength in the anomalous dispersion region of the optical fiber for wavelength conversion and intensity which can flatten the conversion efficiency spectrum over the wide bandwidth. By causing the DFWM by setting the wavelength of the pump to a wavelength &lgr;p with respect to an optical signal having a center wavelength &lgr;s, the optical signal is converted to a wavelength &lgr;c=(&lgr;s·&lgr;p)/(2&lgr;s−&lgr;p), and by previously seeking the wavelength &lgr;s of the optical signal before conversion and the wavelength &lgr;c of the optical signal after conversion, the wavelength of the pump is set to the wavelength &lgr;p=2(&lgr;s·&lgr;c)/(&lgr;s+&lgr;c), and the wavelength of the pump can flatten the conversion efficiency.

摘要翻译： 将波长的波长设定为用于波长转换的光纤的异常色散区域，并将泵浦功率设定为大于MI的预定阈值，从而允许能够在宽带宽内变换转换效率频谱的波长转换。 泵浦源可以振荡具有用于波长转换的光纤的异常色散区域中的波长的光波和可以在宽带宽上平坦化转换效率光谱的强度。 通过将泵的波长相对于具有中心波长的光信号设定为波长lambdp来引起DFWM，光信号被转换成波长lambdc =（lambds.lambdp）/（2lambds-lambdp），并且 通过先前寻求转换之前的光信号的波长和转换后的光信号的波长lambdc，泵的波长被设置为波长lambdp = 2（lambds.lambdc）/（lambds + lambdc），并且 泵的波长可以平坦化转换效率。

公开(公告)号：US06665113B2

公开(公告)日：2003-12-16

申请号：US09750535

申请日：2000-12-28

申请人： Osamu Aso ,  Shu Namiki ,  Kouki Sato ,  Hijiri Nimura

发明人： Osamu Aso ,  Shu Namiki ,  Kouki Sato ,  Hijiri Nimura

IPC分类号： G02F200

CPC分类号： H04B10/299 ,  G02F1/3536 ,  G02F2/004 ,  H04B10/2563 ,  H04J14/02 ,  H04J14/0201

摘要： Solely lightwaves required to be wavelength converted are filtered out from the input broadband WDM lightwaves and are wavelength converted by use of FWM. Not only the broadband simultaneous wavelength conversion that is studied by many researchers, but also more flexible, sub-band wavelength conversion is realized. Frequency interval of the input WDM lightwaves is broadened or reduced in comparison of the frequency interval of the WDM lightwaves inputted to the wavelength converter. The frequency interval variation techniques using the wavelength converter, it can be realized to transfer from a transmission line less influenced by inter-channel crosstalk due to FWM to the different transmission lines strongly influenced by inter-channel crosstalk due to FWM, and vice versa.

摘要翻译： 需要进行波长转换的唯一光波从输入宽带WDM光波中滤出，并通过使用FWM进行波长转换。 不仅实现了许多研究人员研究的宽带同时波长转换，而且实现了更灵活的子带波长转换。 与输入到波长转换器的WDM光波的频率间隔相比，输入WDM光波的频率间隔变宽或减小。 使用波长转换器的频率间隔变化技术可以实现从由于FWM而受到由信道间串扰的较少影响的传输线传输到由FWM引起的由信道间串扰强烈影响的不同传输线路，反之亦然。

公开(公告)号：US06384964B1

公开(公告)日：2002-05-07

申请号：US09492007

申请日：2000-01-27

申请人： Kazuyo Mizuno ,  Shoichi Ozawa ,  Osamu Aso ,  Shu Namiki ,  Yuichiro Irie

发明人： Kazuyo Mizuno ,  Shoichi Ozawa ,  Osamu Aso ,  Shu Namiki ,  Yuichiro Irie

IPC分类号： H01S300

CPC分类号： H01S3/10023 ,  H01S3/06754 ,  H01S2301/04

摘要： The present invention effectively compensates gain wavelength dependency of optical amplifiers by a simple method. That is, a value smaller than the minimum value of gain, in the range of usage wavelengths, of gain wavelength dependency data of the optical amplifiers is predetermined as a reference gain value. A loss wavelength characteristic which counterbalances the gain greater than the reference gain value is provided as an ideal loss wavelength characteristic which completely compensates the gain wavelength dependency.

摘要翻译： 本发明通过简单的方法有效地补偿光放大器的增益波长依赖性。 也就是说，将光放大器的增益波长依赖性数据的使用波长范围内的增益的最小值小的值作为基准增益值进行预定。 将增益大于参考增益值的平衡的损耗波长特性提供为完全补偿增益波长相关性的理想损耗波长特性。