An 8×240 Gbps dense wavelength division multiplexing transmitter with lithium tantalate.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 41309630.
- Also identified by DOI 10.1038/s41467-025-66370-y and PMC identifier 12728223.
- Licence recorded as CC BY-NC-ND.
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Abstract
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.