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<p>Dense wavelength division multiplexing (DWDM) is regarded as a revolutionary solution that significantly enhances transmission capacity. However, DWDM in electro-optic (EO) material platforms faces bottlenecks including limited channel numbers, large insertion losses (ILs), and limited spectral efficiency. Here, an 8×240 Gbps DWDM transmitter at O band is demonstrated on a lithium-tantalate-on-insulator platform through proposing a robust flat-top optical filter based on a novel coupled Fabry-Perot&#xa0;(FP) cavity. The flat-top optical filter shows overall high performance of a low IL of ~0.1–0.4 dB, a large free spectral range of 12 nm, a high extinction ratio (ER) of ~26 dB, and a large fabrication tolerance. The 8-channel DWDM transmitter is further realized with uniform channel spacings of 200 GHz and a total data capacity of 8×240 Gbps. Therefore, it offers a critical strategy for enhancing the capacity of optical links, holding significant promise for widespread application in fields like data centers and artificial intelligence.</p>

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An 8×240 Gbps dense wavelength division multiplexing transmitter with lithium tantalate

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月27日

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  • Mingyu Zhu,
  • Dajian Liu,
  • Weihan Wang,
  • Hongjian Zhong,
  • Fei Huang,
  • Shi Zhao,
  • Aoyun Gao,
  • Jiaxuan Gan,
  • Weike Zhao,
  • Chun Gao,
  • Daixin Lian,
  • Huan Li,
  • Zejie Yu,
  • Daoxin Dai

摘要

Dense wavelength division multiplexing (DWDM) is regarded as a revolutionary solution that significantly enhances transmission capacity. However, DWDM in electro-optic (EO) material platforms faces bottlenecks including limited channel numbers, large insertion losses (ILs), and limited spectral efficiency. Here, an 8×240 Gbps DWDM transmitter at O band is demonstrated on a lithium-tantalate-on-insulator platform through proposing a robust flat-top optical filter based on a novel coupled Fabry-Perot (FP) cavity. The flat-top optical filter shows overall high performance of a low IL of ~0.1–0.4 dB, a large free spectral range of 12 nm, a high extinction ratio (ER) of ~26 dB, and a large fabrication tolerance. The 8-channel DWDM transmitter is further realized with uniform channel spacings of 200 GHz and a total data capacity of 8×240 Gbps. Therefore, it offers a critical strategy for enhancing the capacity of optical links, holding significant promise for widespread application in fields like data centers and artificial intelligence.