Problems created by optical USB cables

Optical USB cables are composed by an optical cable, which is completely free of electromagnetic emissions, and two terminals at the ends of the cable, which do the electro-optical conversion, and these terminal actually produce quite a lot of electromagnetic radiation, though of a lower frequency than the optical HDMI cable .

In addition to the emissions of the electro-optical converters, the terminal at the desk needs also a 5V DC power source, and the commercial products use the typical small power adapter that is plugged in a mains socket. These power adapters are another source of very strong EMF.

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