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).
Other sources of funds â including investment gains â are usually labeled as such but also included as revenue. (Occasionally, youâll see this number referred to as âgross income.â) âNet incomeâ is the phrase commonly used to refer to a companyâs âprofit.â It represents how much money the company has left over, if any, after itâs paid the costs of doing business â payroll, raw materials, taxes, interest on loans, etc.. The real issue is what goes into that income number.