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ORIGINAL RESEARCH article

Front. Phys.
Sec. Optics and Photonics
Volume 12 - 2024 | doi: 10.3389/fphy.2024.1515157

High-Efficiency Spot Size Converter for Photonic Crystal Fiber-to-Waveguide Using Composite Waveguide Structures

Provisionally accepted
Haoyu Li Haoyu Li Baoshuai Li Baoshuai Li *Xingang Zhuang Xingang Zhuang Lingyun Chen Lingyun Chen Bin Wu Bin Wu Luo Zhao Luo Zhao Xingbang Zhu Xingbang Zhu Hengkui Wu Hengkui Wu
  • The 41th Research Institute of China Electronics Technology Group Corporation, Qingdao, China

The final, formatted version of the article will be published soon.

    This paper presents the design of a high-efficiency spot size converter (SSC) for photonic crystal fiber (PCF) to silicon-based waveguides, utilizing composite optical waveguide structures. The SSC is composed of a series of waveguide cores, with one core progressively widening to enable all cores to collectively serve as a composite input port, while the broader core functions as the output port. Simulation results reveal that the proposed design efficiently facilitates mode and energy transfer between the waveguide and the PCF, achieving a coupling efficiency of up to 93.99% over a length of 66μm. Additionally, the SSC exhibits polarization insensitivity, with the high circularity of the output beam enhancing vertical alignment tolerance, and maintaining excellent performance over a wide wavelength range. In sum, this SSC demonstrates excellent coupling efficiency and holds significant promise for applications in optical communication systems and optical integrated circuit systems.

    Keywords: Spot size converter, Photonic crystal fiber, Coupling efficiency, Silicon waveguide, photonic integrated circuit

    Received: 22 Oct 2024; Accepted: 15 Nov 2024.

    Copyright: © 2024 Li, Li, Zhuang, Chen, Wu, Zhao, Zhu and Wu. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence: Baoshuai Li, The 41th Research Institute of China Electronics Technology Group Corporation, Qingdao, China

    Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.