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Periodically poleddomain reverse lithium niobate optical waveguide

A technology of periodic polarization inversion and lithium niobate, applied in the field of optical waveguides, can solve the problems that the mode fields cannot be well matched, affect the wavelength conversion efficiency, and the transmission loss of the waveguide is large, and achieves strong optical field confinement effect and high efficiency. Conducive to the conversion efficiency, the effect of improving the conversion efficiency

Inactive Publication Date: 2013-01-02
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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.

Method used

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  • Periodically poleddomain reverse lithium niobate optical waveguide
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Embodiment Construction

[0014] The periodic polarization inverted lithium niobate optical waveguide suitable for all-optical signal processing according to the present invention includes a waveguide layer 1, a substrate 2, an upper photonic crystal 3 and a lower photonic crystal 4, and the lower photonic crystal 4 is grown on the substrate 2 , directly bond it with the waveguide layer 1 , and grow the photonic crystal 3 on the waveguide layer 1 . Wherein the upper photonic crystal 3 and the lower photonic crystal 4 can be the same structure, also can be different structures, they can be one-dimensional photonic crystal (such as figure 1 shown), two-dimensional photonic crystals (such as figure 2 As shown, it is prepared by punching holes at the upper and lower ends of the waveguide layer or by other means) or a three-dimensional photonic crystal.

[0015] The present invention needs to design the structure of the upper photonic crystal 3 and the lower photonic crystal 4 (i.e. high and low refractiv...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/122G02F1/355
Inventor 孙军强周钰杰冯力群
Owner HUAZHONG UNIV OF SCI & TECH
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