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Optical Time Domain Reflectometer-OTDR
วันที่: 2016-07-27 22:35:15.0view 2508reply 0
OTDR Product User Manual.pdf|
Optical Time Domain Reflectometer Optical Time Domain Reflectometer is the full name of OTDR. OTDR is accurate optoelectronic integrated instrument made according to back scattering that generated from Rayleigh scattering and Fresnel reflection when lights are transmitted in the optical fiber. It is widely used in the maintenance, construction and monitoring of cable line. It can measure the optical fiber length, transmission attenuation of optical fiber, attenuation of splice, and failure location, etc. When the pulse being transmitted downwards along with the optical fiber, and some small changes (such as changes of refractivity and discontinuity) in the material make the lights scatter to different directions, Rayleigh scattering occurs. Partial lights are scattered back along with the direction that opposite to pulse, therefore, it is called Rayleigh back scattering. Back scattering light shows attenuation details that related to the length. Information related to length is gained through time (i.e.: origin of domain of Optical Time Domain Reflectometer). These back scattering signal indicates the attenuation (loss/distance) degree caused by optical fiber. The curve formed is a downwards curve, which reflects the transmission characteristics of the optical fiber. When lights transmitted downwards along with the optical fiber encountering sudden change of material density, Fresnel reflection occurs. Material density change may occur at the connection or fracture parts where air gap existed. This phenomenon is used by OTDR to accurately confirm the position of discontinuity point along with the length of optical fiber. Compared to Rayleigh scattering, Fresnel reflection will reflect quite a lot of lights. The power of Fresnel reflection is tens of thousands times of that of back scattering. The reflection strength is ascertained according to the change degree of refractivity. |
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