Periodically poleddomain reverse lithium niobate optical waveguide

Abstract

The utility model provides a periodically poleddomain reverse lithium niobate optical waveguide which comprises a substrate, a waveguide layer arranged on the substrate, an upper photonic crystal and a lower photonic crystal; the lower photonic crystal is grown between the substrate and the waveguide layer; the upper photonic crystal is grown on the waveguide layer; the upper photonic crystal andthe lower photonic crystal can lead both the fundamental frequency light-wave length and the frequency doubling light-wave length of the periodically poleddomain reverse lithium niobate optical waveguide in a photonic forbidden band; and one-dimensional, two-dimensional or three-dimensional photonic crystals are adopted as the upper photonic crystal and the lower photonic crystal. As the photoniccrystals are both prepared on an upper coating and a lower coating of the waveguide layer, and the periodically poleddomain reverse lithium niobate optical waveguide is combined with the photonic crystals, the optical waveguide loss is low and the conversion efficiency is high.

Description

technical field [0001] The invention relates to an optical waveguide, in particular to a periodic polarization inversion lithium niobate optical waveguide. Background technique [0002] Periodically polarized lithium niobate optical waveguide (PPLN) has double frequency (SHG), sum frequency (SFG), difference frequency (DFG), cascaded frequency double and difference frequency (cSHG / DFG), cascaded sum frequency The second-order and cascaded second-order nonlinear effects such as difference frequency (cSFG / DFG) have great application potential in all-optical wavelength conversion, all-optical switches, all-optical logic gates, and all-optical code conversion. It has received more and more attention in recent years. [0003] So far, the main structures of periodically polarized lithium niobate waveguides include convex strip waveguides, buried waveguides, ridge waveguides, strip carrier waveguides, and diffuse strip waveguides. These waveguides have simple structures and can be...

AI Technical Summary

Problems solved by technology

[0003] So far, the main structures of periodically polarized lithium niobate waveguides include convex strip waveguides, buried waveguides, ridge waveguides, strip carrier waveguides, and diffuse strip waveguides. These waveguides have simple structures and can be fabricated using these structures. The periodic polarization inversion lithium niobate optical waveguide has weak confinement on the optical field, and the transmission loss in the waveguide is relatively large, which has a great influence on the improvement of conversion efficiency.

At the same time, the optical waveguide prepared by using these structures cannot match the mode fields of the signal light and the pump light well when performing all-optical wavelength conversion, thus affecting the wavelength conversion efficiency.

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