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Acta Optica Sinica, Volume. 43, Issue 13, 1306001(2023)

Diagonal Core Reflection Coupler on Multi-Core Fiber

Shitai Yang1,2, Dawei Chen3, Shaochen Duan3, Yijian Chen3, Hongchang Deng3, Chuanxin Teng3, and Libo Yuan1,3、*
Author Affiliations
  • 1Key Laboratory of In-Fiber Integrated Optics, Ministry of Education, Harbin Engineering University, Harbin 150006, Heilongjiang, China
  • 2College of Physics and Optoelectronic Engineering, Harbin Engineering University, Harbin 150006, Heilongjiang, China
  • 3School of Optoelectronic Engineering, Guilin University of Electronic Technology, Guilin 541004, Guangxi, China
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    Figures & Tables(11)
    Multicore optical fibers with centrosymmetric core distribution. (a)-(d) Diagrams of fiber structure; (e)-(h) micrographs of end face

    Fig. 1. Multicore optical fibers with centrosymmetric core distribution. (a)-(d) Diagrams of fiber structure; (e)-(h) micrographs of end face

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    45° cone frustum at seven-core fiber end and its simulation results (d=38 μm). (a) 3D diagram of 45° frustum; (b) axial section of 45° frustum along fiber core a and b; (c) 3D simulation model; (d)-(h) optical field distributions obtained by monitor M1-M5

    Fig. 2. 45° cone frustum at seven-core fiber end and its simulation results (d=38 μm). (a) 3D diagram of 45° frustum; (b) axial section of 45° frustum along fiber core a and b; (c) 3D simulation model; (d)-(h) optical field distributions obtained by monitor M1-M5

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    Optimized 45° arc cone frustum at seven-core fiber end and its simulation results (d=38 μm). (a) 3D diagram of 45° arc frustum; (b) axial section of 45° arc frustum along fiber core a and b; (c) 3D simulation model; (d)-(h) optical field distributions obtained by monitor M1-M5

    Fig. 3. Optimized 45° arc cone frustum at seven-core fiber end and its simulation results (d=38 μm). (a) 3D diagram of 45° arc frustum; (b) axial section of 45° arc frustum along fiber core a and b; (c) 3D simulation model; (d)-(h) optical field distributions obtained by monitor M1-M5

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    Simulation results of 45° frustum and parabolic optimized frustum with d=42 μm. (a) 3D simulation model and optical field distributions obtained by monitor M1-M5 before optimization; (b) 3D simulation model and optical field distributions obtained by monitor M1-M5 after optimization

    Fig. 4. Simulation results of 45° frustum and parabolic optimized frustum with d=42 μm. (a) 3D simulation model and optical field distributions obtained by monitor M1-M5 before optimization; (b) 3D simulation model and optical field distributions obtained by monitor M1-M5 after optimization

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    Fabrication of 45° cone frustum. (a) Schematic of preparation procedure; (b) seven-core fiber end fused with a 40 μm coreless fiber; (c) 45° cone frustum after grinding; (d) 45° cone frustum with metal film; (e) schematic of fiber end grinding device

    Fig. 5. Fabrication of 45° cone frustum. (a) Schematic of preparation procedure; (b) seven-core fiber end fused with a 40 μm coreless fiber; (c) 45° cone frustum after grinding; (d) 45° cone frustum with metal film; (e) schematic of fiber end grinding device

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    Fabrication of 45° arc cone frustum. (a) Schematic of preparation procedure; (b) schematic of multi-angle cone frustum; (c) micrograph of multi-angle cone frustum after grinding; (d) micrograph of arc cone frustum after arc optimization and metal filming

    Fig. 6. Fabrication of 45° arc cone frustum. (a) Schematic of preparation procedure; (b) schematic of multi-angle cone frustum; (c) micrograph of multi-angle cone frustum after grinding; (d) micrograph of arc cone frustum after arc optimization and metal filming

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    Comparison between contour curve of 45° arc cone frustum and optimization function curve

    Fig. 7. Comparison between contour curve of 45° arc cone frustum and optimization function curve

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    Test principle of seven-core fiber diagonal core reflection coupler

    Fig. 8. Test principle of seven-core fiber diagonal core reflection coupler

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    Coupling efficiency tolerance analysis of multi-core fiber diagonal reflection coupler. (a)(b) Offsets of fiber core in x and y directions; (c) variation curves of coupling efficiency with fiber core deviation error; (d)(e) base angle preparation error of 45° cone frustum and arc cone frustum; (f) variation curves of coupling efficiency with base angle deviation error

    Fig. 9. Coupling efficiency tolerance analysis of multi-core fiber diagonal reflection coupler. (a)(b) Offsets of fiber core in x and y directions; (c) variation curves of coupling efficiency with fiber core deviation error; (d)(e) base angle preparation error of 45° cone frustum and arc cone frustum; (f) variation curves of coupling efficiency with base angle deviation error

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    • Table 1. Insertion loss of each channel for seven-core fiber fan-in/fan-out device

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      Table 1. Insertion loss of each channel for seven-core fiber fan-in/fan-out device

      Core number1234567（CC）
      Insertion loss /dB0.780.670.830.980.730.740.51

    • Table 2. Insertion loss test results of optimized and unoptimized diagonal core reflection couplers of 45° cone frustum

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      Table 2. Insertion loss test results of optimized and unoptimized diagonal core reflection couplers of 45° cone frustum

      Core number1-44-12-55-23-66-3Average
      Insertion loss of 45° cone frustum /dB2.052.092.162.122.202.232.14
      Insertion loss of arc cone frustum /dB1.321.351.401.441.421.391.39
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    Shitai Yang, Dawei Chen, Shaochen Duan, Yijian Chen, Hongchang Deng, Chuanxin Teng, Libo Yuan. Diagonal Core Reflection Coupler on Multi-Core Fiber[J]. Acta Optica Sinica, 2023, 43(13): 1306001

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    Paper Information

    Category: Fiber Optics and Optical Communications

    Received: Jan. 11, 2023

    Accepted: Feb. 24, 2023

    Published Online: Jul. 12, 2023

    The Author Email: Yuan Libo (lbyuan@vip.sina.com)

    DOI:10.3788/AOS230465

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology