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Optical waveguide coupling method based on optical fiber taper

A technology of optical waveguide coupling and fiber taper, which is applied in the field of high-efficiency coupling of optical waveguides, can solve the problems of low coupling efficiency, achieve the effects of reducing coupling loss, improving optical information transmission efficiency and processing speed

Inactive Publication Date: 2020-07-03
EAST CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Both methods have the problem of low coupling efficiency

Method used

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  • Optical waveguide coupling method based on optical fiber taper
  • Optical waveguide coupling method based on optical fiber taper
  • Optical waveguide coupling method based on optical fiber taper

Examples

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Embodiment 1

[0067] refer to Figure 3-7 In this embodiment, the present invention is described by taking the coupling of a single optical fiber taper and the input end of a lithium niobate single-mode waveguide on-chip as an example.

[0068] Preparations before coupling the mode-field-matched fiber taper to the light waveguide input port:

[0069] The cross-sections of the incident end and the output end of the single-mode optical waveguide 3 are as follows image 3 As shown, a lithium niobate ridge waveguide 11 is located on a silicon dioxide layer 10 with a thickness of 2 μm, and a lithium niobate substrate 4 is underneath. The crystal orientation of lithium niobate is the z direction, and the wave guiding direction of the ridge waveguide 11 is along the y direction. The ridge waveguide 11 has a top width of 0.5 μm, a bottom width of 0.5 μm, and a thickness of 500 nm. The single-mode waveguide is prepared by chemical mechanical polishing (see literature 7: R. Wu, et al., Nanomateria...

Embodiment 2

[0082] refer to Figure 3-6 and Figure 8-9 In this embodiment, the present invention is illustrated by taking the coupling of the optical fiber tapers arranged in an array and the incident end and output end of the on-chip lithium niobate single-mode waveguide array as an example.

[0083] Preparations before coupling the mode-field-matched fiber taper to the light waveguide input port:

[0084] The cross-sections of the incident end and the output end of the single-mode optical waveguide 3 are as follows image 3 As shown, a lithium niobate ridge waveguide 11 is located on a silicon dioxide layer 10 with a thickness of 2 μm, and a lithium niobate substrate 4 is underneath. The crystal orientation of lithium niobate is the z direction, and the wave guiding direction of the ridge waveguide 11 is along the y direction. The ridge waveguide 11 has a top width of 0.5 μm, a bottom width of 0.5 μm, and a thickness of 500 nm. The single-mode waveguide is prepared by the chemical ...

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Abstract

The invention relates to an optical waveguide coupling method based on an optical fiber taper. The method comprises steps that the size of the optical fiber taper matched with a mode field is designedaccording to mode field distribution of an optical waveguide; the optical fiber taper with a required size is prepared; and coupling and packaging of the optical fiber taper in array distribution andthe optical waveguide array are performed. The waveguide suitable for coupling comprises an optical waveguide and an optical waveguide device, wherein material types of the waveguides include but notlimited to lithium niobate waveguides, silicon-based waveguides, fused quartz waveguides and the like, and the geometrical configuration of the optical waveguide comprises but is not limited to a ridge-shaped waveguide, a circular waveguide, a strip-shaped waveguide and the like. The method is advantaged in that highest coupling efficiency can be over 90 percent, and the method has the characteristic of low-loss coupling.

Description

technical field [0001] The invention relates to efficient coupling of optical waveguides, in particular to a method for efficient coupling of optical waveguides based on fiber tapers. Background technique [0002] The expansion of the information transmission capacity of the communication system has significantly promoted the development of high technologies such as big data, data centers, and unmanned driving. These application requirements in turn require the communication system to have higher rate, lower loss, and lower delay performance. To achieve such ideal performance, the key to technological innovation lies in the innovation of optical devices. [0003] An optical waveguide is generally composed of a cladding with a lower refractive index wrapped around a core with a higher refractive index. The total internal reflection of light is used to confine photons in the optical waveguide for transmission and manipulation. Optical waveguides have strong spatial confineme...

Claims

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Application Information

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IPC IPC(8): G02B6/30
CPCG02B6/305
Inventor 程亚林锦添周俊霞高仁宏
Owner EAST CHINA NORMAL UNIVERSITY
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