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ASE broadband light generated by erbium-doped fiber is amplified spontaneous emission light generated by short-wavelength laser pumping erbium-doped fiber. As shown in the following diagram, the pumped rare earth ions transition between upper and lower energy levels to generate spontaneous emission light, which is amplified in the stimulated emission process. This process is repeated continuously, and even a fairly high output power can be achieved under sufficient pumping conditions. (ASE=Amplified Spontaneous Emission, amplified spontaneous emission light)

Fiber Laser refers to a laser that uses rare earth-doped glass fiber as the gain medium. Fiber lasers can be developed on the basis of fiber amplifiers. High power density is easily formed in the fiber under the action of pump light, resulting in laser The laser energy level of the working substance is "population inversion", and when a positive feedback loop (to form a resonant cavity) is properly added, the laser oscillation output can be formed.

Raman fiber amplifier (RFA) is an important part of dense wavelength division multiplexing (DWDM) communication system. In many nonlinear optical media, the scattering of pump light with a shorter wavelength causes a small part of the incident power to be transferred to another beam whose frequency is shifted down. The amount of frequency shift down is determined by the vibration mode of the medium. This process is called pulling Mann effect. If a weak signal and a strong pump light wave are simultaneously transmitted in the fiber, and the weak signal wavelength is placed within the Raman gain bandwidth of the pump light, the weak signal light can be amplified. This mechanism is based on stimulated Raman scattering The optical amplifier is called RFA.

This paper mainly introduces broadband light sources and its function.

At present, China has become the world's largest manufacturing country, and the domestic market has an increasingly strong demand for laser technology products. Since 2010, thanks to the continuous expansion of the laser processing application market, China's laser industry has gradually entered a period of rapid development. In 2018, the scale of China's laser equipment market reached 60.5 billion yuan, a year-on-year increase of 22.22%, and the compound growth rate from 2011 to 2018 reached 26.45%. China Business Industry Research Institute predicts that China's laser equipment market will reach 98.8 billion yuan in 2021.