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    • 6. 发明授权
    • Measuring method and measuring apparatus of wavelength dispersion distribution characteristics of optical fiber
    • 光纤波长色散分布特性的测量方法和测量装置
    • US06781678B2
    • 2004-08-24
    • US10279268
    • 2002-10-24
    • Shoichi AokiYoshimitsu AsahinaTakao Suzuki
    • Shoichi AokiYoshimitsu AsahinaTakao Suzuki
    • G01N2100
    • G01M11/39G01M11/3127G01M11/338
    • A wavelength dispersion distribution measuring apparatus of an optical fiber includes light signal generation section 1, 2 for generating two light signals with different wavelengths, section 3, 4 for combining the signals and shaping a light pulse signal, directional coupling section 6 for inputting the light pulse signal to one end or the other end of a measured optical fiber and also branching total back-scattered light from the measured optical fiber, wavelength extraction section 9 for passing only a wavelength component of one of four-wave mixed light generated by interaction of two wavelengths launched, measuring section 10 for measuring wavelength dispersion distribution data, changeover section 12-1 to 12-3 for switching the input side and the terminal side of the light pulse from one end to the other end of the measured optical fiber, and calculation section 11 for performing superimposition processing of two measured results associated with the switching.
    • 光纤的波长色散分布测量装置包括用于产生具有不同波长的两个光信号的光信号产生部分1,2,用于组合信号和整形光脉冲信号的部分3,4,用于输入光的定向耦合部分6 脉冲信号到测量光纤的一端或另一端,并且还分支来自测量光纤的总反向散射光,波长提取部分9仅通过由相互作用产生的四波混合光之一的波长分量 发射两个波长,用于测量波长色散分布数据的测量部分10,用于将光脉冲的输入侧和终端侧从测量光纤的一端切换到另一端的切换部分12-1至12-3;以及 计算部分11,用于执行与切换相关联的两个测量结果的叠加处理。
    • 7. 发明授权
    • Frequency spectrum method and frequency spectrum analyzer
    • 频谱法和频谱分析仪
    • US06496134B1
    • 2002-12-17
    • US09665403
    • 2000-09-20
    • Yoshimitsu Asahina
    • Yoshimitsu Asahina
    • H03M112
    • G01R23/165
    • The problem is solved by converting each radio frequency of a plurality of communications systems to tested signals as digital signals via single A/D conversion means; inputting the one A/D-converted tested signal to Fourier transform means 16 for frequency spectrum analysis; converting the other A/D-converted tested signal and a local frequency LO2 via a tested signal converter 13; filtering the converted tested signals S13 to convert them to tested signals S14 containing necessary signal components; and decimating the filtered tested signals S14 and performing frequency spectrum analysis on the decimated tested signals S15 via the Fourier transform means 16.
    • 通过经由单个A / D转换装置将多个通信系统的每个射频转换为经测试的信号作为数字信号来解决问题; 将一个A / D转换的测试信号输入到用于频谱分析的傅里叶变换装置16; 通过测试信号转换器13转换经过其他A / D转换的测试信号和本地频率LO2; 对转换的测试信号S13进行滤波,将其转换为包含必要信号分量的测试信号S14; 对滤波后的测试信号S14进行抽取,并通过傅里叶变换装置16对抽取的测试信号S15进行频谱分析。