In this work, tunable full waveband and adjustable spacing multi-wavelength erbium-doped fiber laser (EDFL) based on the interferometric filtering performance of a bent single-mode fiber (SMF) is experimentally demonstrated. The tunable full waveband EDFL operation with a wide wavelength-tunable range of 11.9 nm was realized by gradually varying the bent diameter of the interferometric filter structure, formed by bending a standard SMF into a balloon shape. Also, when the launched diode pump power was enhanced from 110 to 195 mW, the central wavelength of the EDFL was shifted from 1562.9 nm to 1559.5 nm. Moreover, by adjusting the polarization state inside the cavity, the wavelength operation was switched from a single to multi-wavelength operation. Dual-, triple-, and quadruple- wavelength emissions were achieved. To the best of our knowledge, this is the first time that a bending SMF into a balloon-like MZI has been employed as an all-fiber filter to manipulate the spectral output characteristic of EDFL. The proposed EDFL output characteristics of tunability and switchability can provide great potential in diverse photonics applications.

在这项工作中，实验证明了基于弯曲单模光纤 (SMF) 的干涉滤波性能的可调谐全波段和可调间距多波长掺铒光纤激光器 (EDFL)。通过逐渐改变干涉滤光器结构的弯曲直径，实现了具有 11.9 nm 宽波长可调范围的可调全波段 EDFL 操作，该结构是通过将标准 SMF 弯曲成气球形状而形成的。此外，当发射的二极管泵浦功率从 110 mW 增强到 195 mW 时，EDFL 的中心波长从 1562.9 nm 移动到 1559.5 nm。此外，通过调整腔内的偏振态，波长操作从单波长操作切换到多波长操作。实现了双、三和四波长发射。据我们所知，这是第一次将 SMF 弯曲成气球状 MZI 作为全光纤滤波器来操纵 EDFL 的光谱输出特性。提出的可调谐性和可切换性的 EDFL 输出特性可以在各种光子学应用中提供巨大的潜力。