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Chinese Optics  > 2025  > Accepted Manuscript
XIA Yong-tao, HOU Shang-lin, FENG Yun-long, XIE Cai-jian, LEI Jing-li, WU Gang, YAN Zu-yong. Broadband high-coherence supercontinuum in Al0.24Ga0.76As photonic crystal fibers[J]. Chinese Optics. doi: 10.37188/CO.EN-2025-0011
Citation: XIA Yong-tao, HOU Shang-lin, FENG Yun-long, XIE Cai-jian, LEI Jing-li, WU Gang, YAN Zu-yong. Broadband high-coherence supercontinuum in Al0.24Ga0.76As photonic crystal fibers[J]. Chinese Optics. doi: 10.37188/CO.EN-2025-0011
shu

Broadband high-coherence supercontinuum in Al0.24Ga0.76As photonic crystal fibers

cstr: 32171.14.CO.EN-2025-0011
  • 1.

    School of Science, Lanzhou University of Technology, Lanzhou 730050, China

  • 2.

    College of Information Science and Technology, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China

Funds:  Supported by National Natural Science Foundation of China (No. 61665005); Natural Science Foundation of Gansu Province (No. 24JRRA208)
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  • Author Bio:

    XIA Yong-tao (1998—), male, born in Tianshui, Gansu Province, master student. He received his bachelor's degree from Lanzhou University of Technology in 2020. He is mainly engaged in research on guided-wave optics and optical fiber communication technologies. E-mail：15117207213@163.com

    HOU Shang-lin (1970—), male, born in Tianshui, Gansu Province, Ph.D., professor and doctoral supervisor. He received his Ph.D. from Beijing University of Posts and Telecommunications in 2008. He is mainly engaged in research on novel optical fibers and high-speed optoelectronic devices, next-generation high-speed all-optical communication networks, as well as fiber optic sensors and sensing network technologies. E-mail: houshanglin@vip.163.com

  • Corresponding author: houshanglin@vip.163.com
  • Received Date: 26 Feb 2025
  • Accepted Date: 29 Apr 2025
    • Available Online: 27 Sep 2025
    Abstract

  • An alternative elliptical and circle air-hole-assisted Al0.24Ga0.76As photonic crystal fiber (PCF) was proposed for generating broadband high-coherence mid-infrared supercontinuum, and the dispersion, effective mode area and nonlinear coefficient were investigated by using finite element method (FEM), the evolution of optical pulses propagating along the fiber was simulated, and the supercontinuum and the coherence were analyzed and evaluated under different pumping conditions. The results show that a supercontinuum spectrum with a spectral width of 4.852 μm can be obtained in the proposed fiber with d1/Λ of 0.125, d2/Λ of 0.583 and the zero-dispersion wavelength of 3.228 μm by pumping with a Gaussian pulse with a peak power of 800 W and a full width at half maximum (FWHM) of 20 fs at wavelength of 3.3 μm. When the fiber is pumped by the pulse with the peak power of 2000 W, the FWHM of 80 fs at the wavelength of 4.0 μm in the in the anomalous dispersion region, the modulation instability is obviously suppressed, and the high-coherence supercontinuum spectrum spanning from 1.1 μm to 8.99μm is observed. A part of the pulse energy is transferred to the anomalous dispersion region when pumped at the wavelength of 2.8 μm in the normal dispersion region and a broadband high-coherence supercontinuum spectrum extending from 0.8 μm to 9.8 μm is generated in the 10 mm proposed fiber. This paper introduces elliptical air holes in the Al0.24Ga0.76As photonic crystal fiber, which enhances flexibility for tailoring the performance of supercontinuum, ultimately achieving the broadest supercontinuum spectrum with the shortest fiber length to date.

     

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