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Methodology About Excellence Reviews for a Cause. All Rights Reserved. Are You a Service Provider. The minimum optical reflectance is limited by where the signal is too small relative to the noise to be detected. Likewise, ORL is limited when any part of the signal saturates or the entire trace is not captured such as when there is insufficient dynamic range.
The limits listed are typical. The range for measuring optical reflectance depends on a number of factors wavelength, pulse width, backscatter coefficient, attenuation, and dynamic range. The limits listed in the table are based on using the default FOTP-8 values for backscatter coefficient. Using different values should not affect the maximum limits much if the backscatter coefficient value is accurate for the fiber being tested and the backscatter level is at least 2 dB below the saturation level top of the trace.
For the minimum limit of the reflectance, the backscatter coefficient has a direct impact, as can be seen by comparing However, as the backscatter level nears the noise floor bottom of the trace , increased noise limits the detection of small reflections. The term near-end implies negligible fiber attenuation, which is expected for reflections near the OTDR port say, within meters with good connections and low insertion loss and little fiber attenuation.
At longer distances, higher reflectances can be measured. To support the ongoing work of this site, we display non-personalized Google ads in EEA countries which are targeted using contextual information only on the page.
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