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).
household income. Total income from all people living in a particular household. Income refers not only to the salaries and benefits received but also to receipts from any personal business, investments, dividends and other income. Furthermore, household members do not need to be related to be part of a household.