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For spectral synthesis technology, increasing the number of synthesized laser sub-beams is one of the important ways to increase the synthesis power. Expanding the spectral range of fiber lasers will help increase the number of spectral synthesis laser sub-beams and increase the spectral synthesis power [44-45]. At present, the commonly used spectrum synthesis range is 1050～1072 nm. Further expanding the wavelength range of narrow linewidth fiber lasers to 1030 nm is of great significance to the spectrum synthesis technology. Therefore, many research institutions have focused on short wavelength (wavelength less than 1040 nm) narrow line Wide fiber lasers were studied. This paper mainly studies the 1030 nm fiber laser, and extends the wavelength range of the spectrally synthesized laser sub-beam to 1030 nm.

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.

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The main function of EDFA in the optical fiber communication system is to extend the relay distance. When it is combined with wavelength division multiplexing technology and optical arc technology, it can realize ultra-large capacity and ultra-long distance transmission.