Optical light sources simulate the optical voice, video and data signals of real-life service applications, making them an essential component of a thorough testing process. An optical light source (laser, LED, etc.) is used to emit electromagnetic radiation in order to perform a specific task, whether detecting faults, breaks and microbends, characterizing link-loss or certifying LAN/WANs. As recommended by the ITU-T (G.983.3), optical light sources are also used to test PON networks at three different wavelengths (1310/1490/1550 nm).
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