Broadband silicon grating couplers with high efficiency and a robust design

Daniil S. Zemtsov, Denis M. Zhigunov, Sergey S. Kosolobov, Anastasia K. Zemtsova, Marius Puplauskis, Ivan A. Pshenichnyuk, Vladimir P. Drachev

Research output: Contribution to journalArticlepeer-review


A record-high efficiency and bandwidth for a fiber-to-chip grating coupler have been achieved with a robust design and cost-effective fabrication on a silicon-on-insulator platform. The design optimization involves the usual geometrical parameters, period, and fill factor, and a mode matching for the fiber output and grating. The measured coupling efficiency for TE polarization and 1 dB bandwidth are −2.64 dB (54 %) per grating and 67 nm, respectively. The 3 dB bandwidth exceeds 100 nm, fully covering the C + L band. The results fill the gap between theory and experimental realization in the existing literature.

Original languageEnglish
Pages (from-to)3339-3342
Number of pages4
JournalOptics Letters
Issue number13
Publication statusPublished - 1 Jul 2022


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