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    • 5. 发明申请
    • OPTICAL TIME DOMAIN REFLECTOMETER SYSTEMS AND METHODS USING WIDEBAND OPTICAL SIGNALS FOR SUPPRESSING BEAT NOISE
    • 光学时域反射仪系统和使用宽带光信号抑制BEAT噪声的方法
    • US20140003821A1
    • 2014-01-02
    • US13922177
    • 2013-06-19
    • Daniel M. JoffeLeif SandstromGeorge Elliott Bekken
    • Daniel M. JoffeLeif SandstromGeorge Elliott Bekken
    • H04B10/2507
    • H04B10/2507G01M11/3118H04B10/071
    • A correlation optical time domain reflectometer (OTDR) provides a correlation sequence that is continuously transmitted along a fiber for testing the fiber for anomalies. Such continuous transmission can result in beat noise that degrades the quality of the measured returns. In this regard, each sample is composed of backscatter returns from many points along the fiber that arrive at the OTDR at the same time. When a subset of these returns have frequency differences that appear in the passband of the OTDR receiver, the constructive and destructive interference of these returns at the OTDR receiver can cause significant low-frequency beat noise in the OTDR signal. An optical transmitter is configured to transmit the correlation sequence through the fiber using a wideband optical signal such that the beat noise is suppressed within the passband of the OTDR receiver, thereby improving the quality of the returns measured by the OTDR.
    • 相关光时域反射计(OTDR)提供了沿光纤连续传输的相关序列,用于测试光纤的异常。 这种连续传输可能导致差拍噪声降低测量回报的质量。 在这方面,每个样本由沿同一时间到达OTDR的光纤的许多点的反向散射返回组成。 当这些返回的子集具有出现在OTDR接收机的通带中的频率差时,在OTDR接收机处的这些返回的建构性和相消干扰可以在OTDR信号中引起显着的低频差拍噪声。 光发射器被配置为使用宽带光信号通过光纤发送相关序列,使得在OTDR接收机的通带内抑制拍频噪声,从而提高由OTDR测量的返回质量。