Large mode-area all-solid anti-resonant fiber based on chalcogenide glass for mid-infrared transmission

• Published in: Optics express 2023-02, Vol.31 (5), p.8975-8986
• Main Authors: He, Lelu, Liang, Yachen, Guan, Yongnian, Gu, Zhengxiang, Xia, Kelun, Wang, Xunsi, Dai, Shixun, Shen, Xiang, Liu, Zijun
• Format: Article
• Language: English
• ISSN: 1094-4087; 1094-4087
• DOI: 10.1364/OE.480504

A large mode-area chalcogenide all-solid anti-resonant fiber has been designed and successfully prepared for the first time. The numerical results show that the high-order mode extinction ratio of the designed fiber can reach 6000, and the maximum mode-area is 1500 um . The fiber possesses a calculated low bending loss of less than 10 dB/m as the bending radius is larger than 15 cm. In addition, there is a low normal dispersion of -3 ps/nm/km at 5 μm, which is beneficial for the transmission of high power mid-infrared laser. Finally, a completely structured all-solid fiber was prepared by the precision drilling and two-stage rod-in-tube methods. The fabricated fibers transmit in the mid-infrared spectral range from 4.5 to 7.5 μm with the lowest loss of 7 dB/m @ 4.8 μm. Modeling suggests that the theoretical loss of the optimized structure is consistent with that of the prepared structure in the long wavelength band.