公开(公告)号：US5978122A

公开(公告)日：1999-11-02

申请号：US672071

申请日：1996-06-26

申请人： Toshio Kawazawa ,  Koji Goto ,  Tomohiro Otani ,  Haruo Abe ,  Masando Tanaka

发明人： Toshio Kawazawa ,  Koji Goto ,  Tomohiro Otani ,  Haruo Abe ,  Masando Tanaka

IPC分类号： H04J14/00 ,  H04B10/2507 ,  H04B10/294 ,  H04J14/02 ,  H04B10/16

CPC分类号： H04B10/25253

摘要： A method of suppressing noise and improving the optical transmission characteristic of a wavelength division multiplexing transmission system provides lights for suppressing noise from the light sources (NS1 and NS2) which are multiplexed on the wavelength division multiplexed signal. Consequently, the S/N ratio of each channel of a wavelength division multiplexed signal which propagates through the optical path can be improved.

摘要翻译： 抑制噪声并提高波分复用传输系统的光传输特性的方法提供了用于抑制来自在波分复用信号上复用的光源（NS1和NS2）的噪声的光。 因此，可以提高通过光路传播的波分复用信号的每个通道的信噪比。

公开(公告)号：US07009693B2

公开(公告)日：2006-03-07

申请号：US10455869

申请日：2003-06-06

申请人： Kiyoaki Takashina ,  Toshio Kawazawa ,  Koji Goto

发明人： Kiyoaki Takashina ,  Toshio Kawazawa ,  Koji Goto

IPC分类号： G01N21/00

CPC分类号： H04B10/079 ,  H04B10/071

摘要： To control a gain profile in an optical fiber line to become a desirable form, a C-OTDR measuring apparatus (36) outputs a probe pulse light having a wavelength λm for an optical fiber line (14). A power level on the input or output side of a variable gain equalizer (22) can be measured according to a C-OTDR waveform of a return light of the probe pulse light entered through a C-OTDR path (20c) and an optical fiber line (16). By sweeping the measurement wavelength λm, the gain file is measured. The equalizing characteristics of the variable gain equalizer (22) are remotely controlled so that the gain profile becomes a desirable form according to the measured result.

摘要翻译： 为了控制光纤线路中的增益曲线成为期望的形式，C-OTDR测量装置（36）输出具有用于光纤线路（14）的波长长度的探针脉冲光。 可变增益均衡器（22）的输入或输出侧的功率电平可以根据通过C-OTDR路径（20c）和光学器件（20c）输入的探针脉冲光的返回光的C-OTDR波形来测量 纤维线（16）。 通过扫描测量波长lambdam，测量增益文件。 可变增益均衡器（22）的均衡特性被远程控制，使得增益分布根据测量结果变为期望的形式。

公开(公告)号：US06433865B1

公开(公告)日：2002-08-13

申请号：US09975557

申请日：2001-10-12

申请人： Eiji Kimura ,  Motoki Imamura ,  Toshio Kawazawa ,  Satoru Nagumo

发明人： Eiji Kimura ,  Motoki Imamura ,  Toshio Kawazawa ,  Satoru Nagumo

IPC分类号： G01N2100

CPC分类号： G01M11/335 ,  G01M11/333 ,  G01M11/338

摘要： To provide an apparatus for measuring chromatic dispersion when modulating frequency of a variable wavelength light source is different from modulating frequency of a fixed wavelength light source for reference. This apparatus is provided with a variable wavelength light phase comparator 24 for obtaining a phase difference &phgr;x-&phgr;x′ between a variable wavelength light component and a signal having the first modulating frequency fmx, a fixed wavelength light phase comparator 25 for obtaining a phase difference between a phase difference &phgr;0-&phgr;0′ between a fixed wavelength light component and an electrical signal having the second modulating frequency fm0, a phase difference converter 26 for converting the phase difference &phgr;0-&phgr;0′ calculated by the fixed wavelength light phase comparator 25 into &phgr;ex, which corresponds to the first modulating frequency fmx, and a true phase difference calculator 27 for measuring a true phase difference &phgr; between the phase difference &phgr;x-&phgr;x′ calculated by the variable wavelength light phase comparator 24, and the converted result &phgr;ex of phase difference converter 26, and obtains the true phase difference &phgr; from which an affect of contraction/extension of a DUT 30 is removed when the first modulating frequency fmx and the second modulating frequency fm0 are different, thereby measuring wave dispersion.

摘要翻译： 提供一种用于测量可变波长光源的调制频率时的色散的装置与用于参考的固定波长光源的调制频率不同。该装置设置有可变波长光相位比较器24，用于获得相位差phix- 可变波长光分量和具有第一调制频率fmx的信号之间的“phix”，固定波长光相位比较器25，用于获得固定波长光分量与具有第一调制频率fmx的电信号之间的相位差phi0-phi0'之间的相位差 第二调制频率fm0，用于将由固定波长光相位比较器25计算出的相位差phi0-phi0'转换成对应于第一调制频率fmx的phiex的相位差转换器26和用于测量 相位差phix-phix'ca之间的真相位差phi 由可变波长光相位比较器24计算的相位差转换器26的转换结果phix，并获得当第一调制频率fmx和 第二调制频率fm0不同，从而测量波分散。