Spot size converter based on long-period grating

Abstract

The invention discloses a spot size converter based on a long-period grating. The spot size converter is applied to the field of optical communication and optical waveguide devices, realizes the conversion of the spot size of an optical wave mode, and comprises a substrate, a buffer layer, a high-refractive-index waveguide core, the long-period grating and a low-refractive-index upper cladding strip waveguide, wherein one surface of the buffer layer is fixedly connected with the substrate, and the other opposite surface of the buffer layer is fixedly connected with one surface of the high-refractive-index waveguide core; the other opposite surface of the high-refractive-index waveguide core is used for etching to obtain the long-period grating; and the other opposite surface of the high-refractive-index waveguide core and the long-period grating are fixedly connected with the low-refractive-index upper cladding strip waveguide. According to the invention, the problems of complex structure, high manufacturing difficulty, high technical cost and poor long-term stability of a traditional nanometer photonic waveguide end face coupling spot size converter are solved.

Description

technical field [0001] The invention relates to the fields of optical communication and optical waveguide devices, in particular to a mode-spot converter based on a long-period grating. Background technique [0002] Optical communication technology provides strong technical support for the construction of an information society, and optical waveguide devices are essential core components for the realization of optical communication technology. , more flexible, and more reliable technological evolution plays a crucial role. In the past 10 years, silicon photonics technology and lithium niobate thin film photonics technology are regarded as two key technologies to promote the further development of optical communication technology. However, the size of the waveguides of the above two photonic chips is small, and the thickness and width of the waveguides are usually less than 1 micron, which are often called micro-nano waveguides. When these photonic chips are packaged, the l...

AI Technical Summary

Problems solved by technology

[0003]Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a mode speckle converter based on a long-period grating to solve the traditional nanophotonic waveguide end-face coupling mode speckle The converter has complex structure, difficult manufacture, high technical cost and poor long-term stability

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