Rare Earth Doped Optical Fibers with Multi-section Core

• Main Authors: Chongyuan Huang, Jihong Geng, Tao Luo, Jiali Han, Qing Wang, Rongguang Liang, Shanhui Fan, Shibin Jiang
• Format: Article
• Language: English
• Published: Elsevier 2019-12-01
• Series: iScience
• Online Access: http://www.sciencedirect.com/science/article/pii/S2589004219304675

Summary: The gain bandwidth of a single-mode fiber is limited by the atomic transitions of one rare earth gain element. Here we overcome this long-standing challenge by designing a new single-mode fiber with multi-section core, where each section is doped with different gain element. We theoretically propose and experimentally demonstrate that this configuration provides a gain bandwidth well beyond the capability of conventional design, whereas the inclusion of multiple sections does not compromise single-mode operation or the quality of the transverse modal profile. This new fiber will be beneficial in realizing all fiber laser systems with few-cycle pulse duration or octave tunability. : Optics; Fiber Optics; Optical Materials Subject Areas: Optics, Fiber Optics, Optical Materials