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).
National Income. The income earned in a period of time by a country&#039;s factors of production. It must equal the country&#039;s GNP for that same period. - To calculate over a given time, must subtract from GNP the depreciation of capital over the period.GNP less depreciation is called net national product.ross National Product (GNP). The value of all final goods and services produced by a country&#039;s factors of production and sold on the market in a given time period. - Basic measure of a country&#039;s output-Calculated by adding up the market value of all expenditures on a final output.