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Basic Test Instruments for FTTx GEPON and GPON networks

Main equipment for measurement and testing of FTTx GEPON and GPON networks are:


  • optical power meters
  • lights sources with different wavelengths (1310, 1490 and 1550 nm)
  • visual fault indicators
  • optical time domain reflectometers
  • optical return loss testers

Devices will require operator to input parameters and measurement range and will output a variety of statistical measurements.
Instruments vary in size and precision. Small handheld units are used for field measurement in extreme conditions of temperature, humidity, dust and mechanical stress. Large briefcase-sized bench-top or rack-mountable instrument is used for factory or central office applications, have highly precise measurement capabilities.

Table 1. Shows some testing equipment used for the deployment, operation and maintenance of a FTTP network.


Table 1 Some widely used optical system test instruments for PONs and their functions


Test Instrument


Optical power meter

Measures optical power over a selected wavelength band

Visual fault indicator

Uses visible light to give a quick indication of a break in an optical fiber

Test-support lasers (multiple wavelength)

Assist in tests that measure the wavelength-dependent response of an optical component or link

Optical power attenuator

Reduces power level to prevent instrument damage or to avoid overload distortion in the measurements

OTDR (field instrument)

Measures attenuation, length, connector/splices losses, and reflectance levels; helps locate fiber breaks

Multifunctional optical test system

Factory or field instruments with exchangeable modules for performing a variety of measurements

Optical return loss tester

Measures optical power as a function of wavelength

Optic Spectrum Analyzer (OSA)

Measures optical power as a function of wavelength

BER test equipment

Uses standard eye-pattern masks to evaluate the data handling ability of an optical link


Lomoveishiy – Finland

I needed those to connect my PC on the third floor to have internet access in that room, and ISP installed their modem on the first floor only. After dropping fiber patch cables, plugged in all cables into these media converters at both sides, and link came up instantly. Was much easier than I thought!

Raymond – USA

Great experience – units worked straight out of the box – just needed plug in cables and we were done. I also like the possibility to enable jumbo frames, while we do not have a need for this feature at the current moment it’s great to have this option.

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