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).
DEFINITION of 'Worldwide Income'. The aggregation of a taxpayer's domestic and foreign income. Worldwide income is income earned anywhere in the world and is used to determine taxable income.In the U.S., citizens and resident aliens are subject to tax on worldwide income.Next Up.oney that is paid to U.S. citizens or resident aliens as wages, independent contractor payments or unearned income from pensions, rents, royalties and investments may all be subject to tax by the IRS. There are some exceptions for U.S. taxpayers who live abroad. See IRS Publication 525 for more information.