This paper mainly introduces broadband light sources and its function.
With the development of technology and process, the semiconductor laser diodes currently in practical use have a complicated multilayer structure.
Fiber lasers refer to lasers that use rare-earth-doped glass fibers as gain media. 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 working material. The energy level "number inversion" can form laser oscillation output when a positive feedback loop (form a resonant cavity) is properly added.
This article mainly describes the characteristics and concepts of FP lasers and DFB lasers
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