What are reflective and non-reflective events in otdr?
January 21 , 2022
1. The height of each point in the OTDR curve represents the backscattered light intensity at that location. When looking at the OTDR curve, you can see that the reflected signal is raised in some places, as if the optical power at the back is stronger than the front, which is impossible. Generally, this situation is the backscattering peak caused by the Fresnel reflection at the splicing, breaking, and end point of the optical fiber. Such places are also called reflection events.
2. Fiber splicing and multiple bending will cause large losses. These places are simply Rayleigh scattering of the signal after attenuation. This position is called a non-reflection event. 3. The optical time domain reflectometer is an instrument that understands the uniformity, defects, fractures, joint coupling and other properties of the optical fiber through the analysis of the measurement curve.
It is made according to the principle of backscattering of light and Fresnel inversion. It uses the backscattered light generated when light propagates in the fiber to obtain attenuation information. It can be used to measure fiber attenuation, splice loss, fiber fault location and understanding. The loss distribution of optical fibers along the length, etc., is an indispensable tool in the construction, maintenance and monitoring of optical cables.
4. The optical time domain reflectometer will enter a series of optical bursts into the fiber for inspection. The inspection method is to receive the light signal from the same side of the incoming surge, because the incoming signal will be scattered and reflected back when encountering media with different refractive indices. The intensity of the reflected light signal is measured as a function of time, so it can be converted to the length of the fiber.
Optical time domain reflectometry can be used to measure the length and attenuation of optical fibers, including the fusion and transition of optical fibers. It can also be used to measure the interruption point when the fiber is broken.
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