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Chip-fiber vertical coupling structure based on double-layer grating

A technology of vertical coupling and coupling structure, which is applied in the coupling of optical waveguides, light guides, optics, etc., to achieve the effects of simple structure, favorable packaging design, and high optical coupling efficiency

Active Publication Date: 2018-03-06
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For this reason, the present invention provides a vertical coupling structure based on double-layer gratings, which solves the problem of realizing efficient coupling of light between chips and optical fibers

Method used

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  • Chip-fiber vertical coupling structure based on double-layer grating
  • Chip-fiber vertical coupling structure based on double-layer grating
  • Chip-fiber vertical coupling structure based on double-layer grating

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Embodiment Construction

[0019] The coupling structure of the present invention is as figure 1 As shown, from bottom to top are the substrate, the transmission medium, the lower grating, the epitaxial medium, and the upper grating. Diffraction occurs when the incident light is incident on the upper grating, the energy of the beam is mainly concentrated in the +1 and -1 order diffracted light, the propagation direction of the light is deflected, and the diffracted beam is randomly incident on the lower grating, making the light happen again Diffraction, so that the direction of propagation of the final light changes by 90 degrees. Because of the sequential diffraction of the double-layer grating, the coupling efficiency of light between the fiber and the chip has been improved to a certain extent compared with the previous structure using a custom single grating.

[0020] Under incident light of different wavelengths and modes, the structural parameters of the grating can be selected to make the coupl...

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Abstract

The invention discloses a chip-fiber vertical coupling structure based on a double-layer grating. The coupling structure comprises a substrate, a transmission dielectric layer, a lower grating, an epitaxial dielectric layer and an upper grating, the upper grating and the lower grating enable the zero-order diffraction intensity of incident light to be the lowest, the incident light passes the coupling structure, and the propagation direction deflects for 90 degrees. According to the chip-fiber vertical coupling structure, high-efficiency coupling of fiber-chip vertical incidence can be realized by employing the double-layer grating structure; compared with the conventional coupling grating structure, the design structure is advantaged by complete vertical incidence, simple structure, easymachining and high efficiency; and by employing the structure, 48% of the coupling efficiency between the fiber and an SOI waveguide in a communication waveband (1300-1700 nm) can be realized.

Description

technical field [0001] The invention relates to a double-layer grating structure for realizing chip-fiber vertical coupling. Background technique [0002] The development trend of the chip is the photoelectric hybrid integration of electricity-optic-electricity. The micro-optoelectronic integrated chip integrates integrated circuits and photonic integrated devices to realize an optoelectronic integrated system with practical value. It has important significance and broad application prospects in optical interconnection, optical switching, optical signal processing and other aspects. With the development of silicon-based optoelectronic technology, the large refractive index of silicon enables devices to be made smaller and smaller, and more optoelectronic functional devices can be integrated on the same chip. [0003] Since silicon-based light source is difficult to realize at present, the general light source chooses an external laser. Therefore, a coupler is needed to cou...

Claims

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Application Information

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IPC IPC(8): G02B6/42
CPCG02B6/4204
Inventor 刘晓平王鹏
Owner NANJING UNIV
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