Common unit definitions for fiber optics
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nDefinition of commonly used units in optical fiber communications: 1. dB = 10 log10 ( Pout / Pin ) Pout: output power; Pin: input power 2. dBm = 10 log10 ( P / 1mw) is a unit widely used in communication engineering ； Typically expressed as optical power referenced to 1 milliwatt ； example: –10dBm means that the optical power is equal to 100uw. 3. dBu = 10 log10 ( P / 1uw)
1. dB = 10 log10 ( Pout / Pin ) Pout: output power; Pin: input power 2. dBm = 10 log10 ( P / 1mw) is a unit widely used in communication engineering； Typically expressed as optical power referenced to 1 milliwatt ； example: –10dBm means that the optical power is equal to 100uw. 3. dBu = 10 log10 ( P / 1uw)
In addition to light, communication also includes signal lines. Is there anything else? Is there any difference?