Abstract
Fiber lasers have developed rapidly in recent years and play an important role in many fields. The L band refers to a wavelength range in fiber optic communications, usually between 1570 nanometers and 1625 nanometers. At present, research on L-band fiber lasers mainly focuses on improving their output power, enhancing spectral purity, and reducing costs. In this article, the author discusses the research progress and development trends based on the development of fiber lasers in the 1570 nm to 1650 nm band at home and abroad. Through investigation and research, it can be concluded that after 30 years of rapid development of single-frequency fiber lasers, the average power is hundreds of watts, the peak power is several kilowatts, the laser line width is 100 Hz, the intensity noise is close to the quantum noise limit, and the wavelength tuning range is tens of nanometers. Despite great progress, there are still some deficiencies in basic research and applied technology that need more development.
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