Нанофизика и наноэлектроника. Труды XXVIII Международного симпозиума (Нижний Новгород, 11–15 марта 2024 г.). В 2 томах. Том 2-й

Т. 2. Н. Новгород : -, 2024.

Ивашенцева И. В., Третьяков И. В., Уэрдан Г. Д., Каурова Н. С., Голиков А. Д., Goltsman G.

Just as optical fiber has replaced electrical cables thanks to its much higher data transfer rates, photonic integrated circuits (PICs) will replace electronic integrated circuits in the foreseeable future.
Single-mode optical fibers are used to connect PICs to external devices, including other PICs.
In our work, we study how radiation from a single-mode optical fiber is coupled into the PIC's dielectric Si3N4
waveguide. The PIC's input and output Si3N4 waveguides were fabricated as 300-µm-long waveguide sections tapering to 0.15–0.3 µm toward the PIC's crystal ends, known as end-face inverted tapers.
The end-face input/output method is highly efficient compared to input/output using diffraction gratings. The inverted taper adiabatically transforms the fundamental mode of a rectangular
Si3N4 waveguide into the fundamental mode of a single-mode optical fiber. In this study, we experimentally achieved a matching efficiency of -0.65 dB per endface of the Si3N4 waveguide, which is one of the best results
among competitors on the Russian market.

Keywords: фотонная интегральная схема, оптическое волокно, торцевые инвертированые тейперы, эффективность согласования