Order of magnitude; power in dBm

Order of magnitude in power

 

Orders of magnitude are generally used to make very approximate comparisons. If two numbers differ by one order of magnitude, on is about tem times larger than the other. Two numbers of the same order of magnitude have roughly the same scale. It widely used in optics, when measuring the power of laser. Power in watts produced by various of energy. They usually grouped by order of magnitude, and each of the group covers three orders of magnitude, or a factor of 1000.

 

Femtowatt (10^-15)

10 fW is -110 dBm

Picowatt (10^-12 watt)

1 pW is -90 dBm

Nanowatt (10^-9 watt)

100 nW is -40 dBm

Microwatt (10^-6 watt)

1 μW is -30 dBm

Milliwatt (10^-3 watt)

1 mW is 0 dBm

 

Watt

 

Kilowatt (10³ watt)

1 kW is 60 dBm

Megawatt (10⁶ watt)

1 MW is 90 dBm

10 MW is 100 dBm

Gigawatt (10⁹ watt)

 

Terawatt (10¹² watt)

 

Petawatt (10¹⁵ watt)

 

http://en.wikipedia.org/wiki/Orders_of_magnitude_(power)

 

 

dBm convert to watts

 

dBm is an abbreviation for the power ratio id dB of the measured power referenced to 1 milliwatt (1 mW). In fibre optic networks, it is a convenient measure of absolute power because of its capability to express both very large and very small values in a short form.

Where P is the power in W and x is the power in dBm.