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).
At this equilibrium national income of $250 billion, the firms have neither the tendency to increase output nor the tendency to decrease output. Hence, $250 billion is the equilibrium level of national income.The equilibrium output, in this simple Keynesian analysis, does not mean full employment.ccording to J. M. Keynes, the equilibrium level of national income is that situation in which aggregate demand (C+ I) is equal to aggregate supply (C + S). The aggregate demand (C+ I) refers to the total spending in the economy.