Why is there a small difference in the attenuation coefficient of optical fibers when testing the same model OTDR?
The difference in fiber attenuation coefficient during OTDR testing of the same model is mainly due to various factors. Firstly, there is a positive and negative range for the nominal wavelength value of EXFO OTDR testing, with most models having a nominal value of ± 20nm, such as 1550nm.
Wavelength deviation may slightly affect the results. Because the attenuation coefficient of optical fibers is closely related to wavelength, the absorption and scattering characteristics of optical fibers are different at different wavelengths, and wavelength deviation can change the measured attenuation value.
The following table shows the changes in nominal loss and loss when the wavelength of the light source changes by 20nm.
Different testing environment conditions can also cause differences. Environmental factors such as temperature and humidity can affect the performance of optical fibers and the working state of OTDRs, thereby interfering with the measurement of attenuation coefficients. Furthermore, the quality and uniformity of the optical fiber itself are not completely consistent, and there may be local small defects or parameter fluctuations, which can also result in different attenuation coefficients obtained when testing the same type of OTDR at different positions. In addition, operational factors such as OTDR calibration and test parameter settings can also have a certain impact on the final attenuation coefficient test results.
Why is there a small difference in the attenuation coefficient of optical fibers when testing the same model OTDR?
The difference in fiber attenuation coefficient during OTDR testing of the same model is mainly due to various factors. Firstly, there is a positive and negative range for the nominal wavelength value of EXFO OTDR testing, with most models having a nominal value of ± 20nm, such as 1550nm.
Wavelength deviation may slightly affect the results. Because the attenuation coefficient of optical fibers is closely related to wavelength, the absorption and scattering characteristics of optical fibers are different at different wavelengths, and wavelength deviation can change the measured attenuation value.
The following table shows the changes in nominal loss and loss when the wavelength of the light source changes by 20nm.
Different testing environment conditions can also cause differences. Environmental factors such as temperature and humidity can affect the performance of optical fibers and the working state of OTDRs, thereby interfering with the measurement of attenuation coefficients. Furthermore, the quality and uniformity of the optical fiber itself are not completely consistent, and there may be local small defects or parameter fluctuations, which can also result in different attenuation coefficients obtained when testing the same type of OTDR at different positions. In addition, operational factors such as OTDR calibration and test parameter settings can also have a certain impact on the final attenuation coefficient test results.
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