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).
Personal income in the United States. Personal income is an individual's total earnings from wages, investment interest, and other sources. The Bureau of Labor Statistics reported a median personal income of $865 per week for all full-time workers in 2017.