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<p>Lithium niobate on insulator (LNOI), with its excellent electro-optic properties, high transparency, and stability, has been widely used in high-speed photonic integrated circuits (PICs). Waveguide crossings are one of the most fundamental and critical interconnect structures in PICs. They enable efficient, low-loss, and low-crosstalk transmission of optical signals at waveguide intersections, thereby facilitating complex optical routing in two-dimensional planes. We demonstrate an improved broadband, low-loss, compact LNOI waveguide crossing covering portions of the S-band and fully spanning the C, L, and U bands. Using the adjoint algorithm, the design achieves &lt;0.12 dB insertion loss and &lt; −40 dB crosstalk over 180 nm bandwidth, with best-case values of 0.05 dB and −50 dB. Its 16 × 16 <i>μ</i>m<sup>2</sup> footprint is smaller than comparable designs. This work demonstrates the viability of high-performance, compact inverse-designed devices on the LNOI platform, advancing possibilities for high-density photonic applications in data centers and quantum photonics.</p>

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Broadband, high-efficient and compact inverse-designed crossing on thin-film lithium niobate platform

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月7日

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  • Linye He,
  • Houling Ji,
  • Fuyong Yue,
  • Xiaoyan Zhang,
  • Lei Wang,
  • Feng Gao

摘要

Lithium niobate on insulator (LNOI), with its excellent electro-optic properties, high transparency, and stability, has been widely used in high-speed photonic integrated circuits (PICs). Waveguide crossings are one of the most fundamental and critical interconnect structures in PICs. They enable efficient, low-loss, and low-crosstalk transmission of optical signals at waveguide intersections, thereby facilitating complex optical routing in two-dimensional planes. We demonstrate an improved broadband, low-loss, compact LNOI waveguide crossing covering portions of the S-band and fully spanning the C, L, and U bands. Using the adjoint algorithm, the design achieves <0.12 dB insertion loss and < −40 dB crosstalk over 180 nm bandwidth, with best-case values of 0.05 dB and −50 dB. Its 16 × 16 μm2 footprint is smaller than comparable designs. This work demonstrates the viability of high-performance, compact inverse-designed devices on the LNOI platform, advancing possibilities for high-density photonic applications in data centers and quantum photonics.