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Never confuse dB with dBm when measuring power in fiber optics. dBm is always relative to 1milliwatt of power. So zero dBm is always equal to 1milliwatt. dB is the quantity of loss or gain relative to a reference, so you have to know what your reference point is. Otherwise dB on its own is meaningless. Check out Tempo's Fiber Tools HERE: OTDR ...
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