A subwavelength multimode y-branch waveguide

Abstract

The invention belongs to the field of integrated photonic devices, provides a sub-wavelength multimode Y-branch waveguide, and aims to solve the problem of mode mismatch due to the fact that the minimum gap width of a branch waveguide based on an existing photoetching process is not zero. The sub-wavelength multimode Y-branch waveguide comprises an input main waveguide and two output branch waveguides, the minimum gap width of each output branch waveguide is not zero, the input main waveguide comprises a straight waveguide and a chirped sub-wavelength slit waveguide which are connected, and each output branch waveguide comprises two S-shaped waveguides. The chirped slit structure is introduced into the main waveguide, and the slit structure is composed of N sections of different one-dimensional sub-wavelength gratings. The equivalent width or the equivalent material refractive index of the N sections of sub-wavelength gratings is optimized in design to equivalently realize the branch waveguide whose gap width is changed gradually from zero heat radiation, the problem of mode mismatch is solved, additional loss and crosstalk of a device are reduced, and the performance of the multimode Y branch waveguide is improved.

Description

technical field [0001] The invention belongs to the field of integrated photonic devices, and more specifically relates to a sub-wavelength multimode Y-branch waveguide. Background technique [0002] Mode division multiplexing is the most concerned emerging multiplexing technology after wavelength division multiplexing, and it is expected to significantly improve single-wavelength communication capacity by introducing multiple orthogonal modes. For mode-division multiplexing systems, due to the inclusion of multiple modes, the design of related photonic integrated devices is more complicated, and both fundamental and higher-order modes need to be considered, so it is also necessary to study multi-mode photonic devices for multi-mode optical interconnection links . Since silicon photonics has attracted much attention due to its CMOS compatibility, the research on silicon-based multimode photonic integrated devices has become a new hotspot. Due to its simple and flexible mod...

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Problems solved by technology

[0004] Aiming at the defects of the prior art, the purpose of the present invention is to provide a sub-wavelength multimode Y-branch waveguide, aiming to solve the mode problem caused by the fact that the minimum gap width of the conventional multimode Y-branch waveguide in the existing photolithography process cannot be zero. mismatch problem

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