Doped fiber amplifier (The typical representative: EDFA) Erbium-doped fiber amplifier (EDFA) is the most widely used fiber-optic amplifiers, mainly made of Erbium-doped fiber (EDF), pump light source, optical couplers, optical isolators, optical filters and other components.
Noun. 1. national income-the total value of all income in a nation (wages and profits and interest and rents and pension payments) during a given period (usually 1 yr).
What is 'Household Income'. Household income is the combined gross income of all the members of a household who are 15 years or older. Individuals do not have to be related in any way to be considered members of the same household. Household income is an important risk measure used by lenders for underwriting loans, as well as a useful economic indicator of an area's standard of living.