When the upper state population is not reversed, the channel with greater ratio of emission and absorptioncross-section has greater competitive advantage.
Studying the absorption characteristic of SO2 flue gas is the base of online monitoring. The temperature and pressure have different effect on absorptioncross-section.
The relationship between the temperature dependence of Erbium-doped Fiber Amplifier(EDFA) gain and emission and absorptioncross-section of Erbium fiber is analyzed theoretically.