Blogs that things an OTDR

What is an OTDR


OTDR Basics and techniques of use Roberto Noris Rertech

What is an OTDR

  • OTDR: optical reflectometer in the time domain
  • Same principle as radar: it emits pulses into the optical fibre network and 'listens' for reflections along the network.
  • Allows you to generate a map of the entire optical network, to determine the distance, any connectors or joints present, breaks, bends in the fibre, etc.....
  • Its use requires in-depth knowledge of the operating principle and the main setting parameters.

Rayleigh backscattering operating principle

  • This is a physical phenomenon of the optical fibra: while light propagates from A to B, a small portion (about 1 millionth, --60 dB) propagates in the opposite direction from B to A.
  • The larger the cross-section of the core, the lower the backscattering

Fresnel reflections

In addition to backscattering, which is intrinsic to the optical fibra, reflections are generated in general when there is a sudden change in the transmission index through which the light flow passes. These are called 'Fresnel reflections'. For example:

  • In the event of fire failure (sudden passage to air), e.g. fire failure or breakage
  • In the case of a pair of optical connectors (fire/air gap/fire) or a mechanical coupling
  • In special cases of small imperfections in the optical fibra core
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