LNOI-based spot-size converter directly coupled with single-mode fiber
A single-mode fiber and converter technology, applied in the field of integrated optics, can solve the problems of difficulty in achieving high coupling bandwidth and polarization independence, lack of encapsulation solutions for grating coupling, limited alignment tolerance, etc., which is conducive to large-scale optical circuit integration, The overall structure is compact and the coupling efficiency is improved
Pending Publication Date: 2021-11-12
BEIJING UNIV OF TECH
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The invention discloses an LNOI-based spot size converter directly coupled with a single-mode optical fiber and a method, relates to the field of integrated optics, and aims to solve the problem of efficient coupling between an optical fiber and an LNOI chip. The structure is composed of a substrate, a buffer layer and a waveguide layer from bottom to top, the waveguide layer can be divided into two parts in the light field transmission direction, the first part is a double-layer forward conical area made of low-refractive-index waveguides and used for mode field conversion between an input light field and a reverse conical area, and the second part is a reverse conical region formed by etching the top layer lithium niobate and is used for final mode field transformation with the LNOI chip waveguide. Through the design of the double-layer forward conical area, the transition effect between the reverse conical region and an external input light field is achieved, the coupling between the reverse conical region and a larger input mode field can be achieved, the conversion efficiency is further improved, the whole structure is more compact and efficient, and large-scale light path integration is better achieved.
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Property | Measurement | Unit |
Thickness | 500.0 ~ 600.0 | µm |
Thickness | 2.0 ~ 3.0 | µm |
Thickness | 400.0 | nm |
tensile | MPa | |
Particle size | Pa | |
strength | 10 |
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