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).
Gross national income Gross national income (GNI) per capita, in $ â Measures resources available for consumption and investment â Informs about economically productive activities Single indicator â¢ Past levels of GNI matter â¢ Economic growth matters â¢ Exchange rate matters â¢ Population matters