Photonics Research, Volume. 11, Issue 10, 1733(2023)

Highly efficient on-chip erbium–ytterbium co-doped lithium niobate waveguide amplifiers

Yuqi Zhang1, Qiang Luo1, Dahuai Zheng1,3, Shuolin Wang2, Shiguo Liu1, Hongde Liu1、*, Fang Bo1,4, Yongfa Kong1,5, and Jingjun Xu1,6
Author Affiliations
  • 1MOE Key Laboratory of Weak-Light Nonlinear Photonics, TEDA Institute of Applied Physics and School of Physics, Nankai University, Tianjin 300457, China
  • 2School of Science, Jiangsu University of Science and Technology, Zhenjiang 212100, China
  • 3e-mail: dhzheng@nankai.edu.cn
  • 4e-mail: bofang@nankai.edu.cn
  • 5e-mail: kongyf@nankai.edu.cn
  • 6e-mail: jjxu@nankai.edu.cn
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    Figures & Tables(6)
    Schematic of the fabrication process for Er3+/Yb3+ co-doped LNOI waveguides.
    SEM images of the (a) cross section and (b) longitudinal section of Er3+/Yb3+ co-doped LN waveguide. Simulated electric field distribution of single mode in the LN waveguide at (c) λ=974 nm and (d) λ=1531 nm.
    Schematic of the experimental setup for characterization of Er3+/Yb3+ co-doped LNOI waveguide amplifiers.
    Optical transmission spectra of Er3+/Yb3+ co-doped LNOI microring resonators on the same chip in (a) 980 nm band and (b) 1550 nm band. The Lorentz fit (red line) shows 2.03×105 and 1.43×105 loaded quality factors near 974 and 1531 nm, respectively. (The inset shows the SEM image of a microring resonator with a radius of 100 μm used for testing in the 1550 nm band.)
    (a) Measured signal spectra at ∼1531.31 nm with increasing pump powers of 0, 0.21, 0.46, 2.96, and 6.20 mW. (b) Dependence of net internal gain on pump power at a fixed on-chip input signal power of ∼28 nW. (c) Net internal gain as a function of increasing signal power at a fixed pump power of ∼6.20 mW. (d) The measured internal conversion efficiency (purple dot) is used as a function of signal power. The red dashed line shows a linear trend based on small signal gain.
    (a) Infrared absorption spectra of Er3+/Yb3+ co-doped, Er3+ doped, and Yb3+ doped LN. (b) Infrared emission spectra of Er3+/Yb3+ co-doped, Er3+ doped, and Yb3+ doped LN under 980 nm excitation at high pump power. The inset shows the infrared emission spectra of Er3+/Yb3+ co-doped and Er3+ doped LN at lower pump power. (c) Decay curves of the Yb3+ emission at 1062 nm in Er3+/Yb3+ co-doped and Yb3+ doped LN, excited under 980 nm. (d) Decay curves of the Er3+ emission at 1531 nm in Er3+/Yb3+ co-doped and Er3+ doped LN, excited under 980 nm.
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    Yuqi Zhang, Qiang Luo, Dahuai Zheng, Shuolin Wang, Shiguo Liu, Hongde Liu, Fang Bo, Yongfa Kong, Jingjun Xu. Highly efficient on-chip erbium–ytterbium co-doped lithium niobate waveguide amplifiers[J]. Photonics Research, 2023, 11(10): 1733

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    Paper Information

    Category: Integrated Optics

    Received: Jun. 14, 2023

    Accepted: Jul. 30, 2023

    Published Online: Sep. 27, 2023

    The Author Email: Hongde Liu (liuhd97@nankai.edu.cn)

    DOI:10.1364/PRJ.497947

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