Evgeniy V. Sergeev's scientific contributions

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Publications (1)

Fig. 2. Calculation of Si3N4 effective index of modes excited in a waveguide as a function of waveguide width (a), Fundamental mode excited in the waveguide with 220×1200 nm cross section (b), Calculation of the taper length at different width for different fiber types with wavelength 1550 nm (c-f), Calculation of the taper width with fixed length of taper (360 um) for different fiber types with wavelength 1550 nm (g) and simulation of mode propagation for lensed fiber (h).
Fig. 3. Si3N4 PICs with edge coupling fabrication process.
Fig. 5. Schematic of the measurement setup for cut-back characterization (a); Propagation losses measured by the cut-back calculated: * = + , -' .; + = 12314546738 93::;:, . = =3>19785 93::;: for wavelength 1550 nm (b); Schematic of the measurement setup for OFDR characterization (c) and OFDR characterization along the waveguide. The dashed line shows the linear fit of the waveguide reflections (d)
Si3N4 taper coupling losses overview
Tutorial on Silicon Photonics Integrated Platform Fiber Edge Coupling
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May 2024

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Evgeniy V. Sergeev

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Photonic integrated circuits (PICs) play a crucial role in almost every aspect of modern life, such as data storage, telecommunications, medical diagnostics, green energy, autonomous driving, agriculture, and high-performance computing. To fully harness their benefits, an efficient coupling mechanism is required to successfully launch light into waveguides from fibers. This study introduces low-loss coupling strategies and their implementation for a silicon nitride integrated platform. Here we present an overview of coupling technologies, optimized designs, and a tutorial on manufacturing techniques for inverted tapers, which enable effective coupling for both transverse-magnetic and transverse-electric modes. The optimized coupling losses for the UHNA-7 fiber and the inverted taper Si3N4 coupler reached -0.81 dB at 1550 nm per connection for single-mode waveguides with 220x1200 nm cross section. The measured coupling losses in the inverted taper coupler with a standard single-mode fiber were -3.28 dB at 1550 nm per connection for the same platform.

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