![]() ![]() There are many different test modules, it can help clients to verify the performance of their Ethernet. For example, if the light source operates at the 1310nm wavelength, the optical power meter should also be set to 1310nm testing. The Ethernet test engine XGT 200 provide a comprehensive test for next generation Ethernet solution. Since optical fiber loss varies with wavelength, optical power meters should use the same wavelength as the one used by the light source. At the other end of the cable, the power meter reads that light, or optical power level, and determines the amount of signal loss. The light source sends a wavelength of light down the fiber. To test the end-to-end performance of a fiber optic system, two pieces of handheld equipment are needed – an OPM tester and a light source. Most meters have an uncertainty of +/-5% or approximately 0.2dB, no matter what the resolution of the display may be. ![]() In addition, the measurement uncertainty of practically all fiber optic power meters is the same, limited by the physical constraints of transferring standards with optical connectors. For example, laboratory networks usually need OPM testers with a resolution of 0.01dB, and a resolution of 0.001dB is available on a few specialized fiber optic power meters. One should choose an appropriate resolution for measurement according to the test need. There are various OPM testers due to different resolutions varying from 0.001dB to 0.1dB.
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