How to select and use an OTDR?

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How to select and use an OTDR?

2023-05-26

OTDR (Optical Time Domain Reflectometer) Overview

An optical time-domain reflectometer or OTDR is an instrument that characterizes an optical fiber. There are two categories of an OTDR, namely bench-top and hand-held. Depending on the power source of the reflectometer, the two categories differ from one another. In a bench-top OTDR, the power source is direct AC, while in the case of hand-held OTDRs, the power comes from a sourced battery.

Selecting parameters

Optical time domain reflectometers have an area of usage in the fields and organizations that directly involve the functionalities of optical fiber. They use it to certify the performing ability of the new fiber-optic links and identify any existing problem of the already in use fiber-optic links. The fields requiring the OTDR are - 5G testing, photonic integrated circuit testing in 400G/800G labs. As it performs critical testing tasks, choosing the right OTDR depends on various aspects and parameters that need inspecting before selection.

1.Measurement range

Various application field needing the instrument to carry their functioning has a requirement of varied ranges of measurement. Depending on the limit of the applicant field, you should choose the right OTDR. The maximum attenuation of the instrument is the highest range in dB units between the placed instrument and the event in measure, which reflects accuracy to understand the acceptable limit of it.

2.Dynamic range values

It is essential to be aware of the dynamic range values representing the maximum distance for which the OTDR can provide a display. Depending on the wavelength expressed in decibels, you can identify the number of kilometers to which the OTDR can function. The commonly in use ranges are 35db denoting 80 to 125km, 40dB denoting 95 to 150km, 50dB denoting 125 to 225km, etc. Remember that the actual OTDR measurement actual fiber and event loss happening in the network.

3.Dead zones

An important characteristic while selecting the correct OTDR for your use is the dead zone that determines its ability to detect and measure the two closely spaced events on the fiber links. The two aspects of dead zone testing carried out by the selectors are the Event dead zone or EDZ and Attenuation dead zone or ADZ. By inspecting EDZ, they identify the minimum distance where OTDR can distinguish two consecutive pairs of connectors. In ADZ, they find the minimum distance after a reflective event that OTDR can measure a splice non-reflective event.

4.Other factors

Apart from the factors mentioned above, the other aspects worth keeping in mind while choosing an OTDR to exhibit maximum practical usability are

Size and weight
Display size should be at least 5 inches
Battery life
Device connectivity; especially wireless connectivity for better result exportation
Post-processing software availability for better convenience

X-2100 series tester is a comprehensive optical fiber measuring instrument to solve the measurement of various parameters of optical fiber. It mainly USES OTDR function and has other common measuring functions. Really reflected: ONE MACHINE, TESTING ALL!