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Optical waveguide mode converter used for improving optical waveguide transmission characteristic

A technology of mode converter and transmission characteristics, applied in the direction of optical waveguide light guide, optical waveguide coupling, light guide, etc., can solve problems such as large scattering loss

Active Publication Date: 2018-09-04
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to propose a kind of optical waveguide mode converter that improves optical waveguide transmission characteristic in view of the defect existing in the prior art, to solve single-mode fiber-optical waveguide coupling, due to the multimode structure of optical waveguide caused relatively Large scattering loss (affected by roughness) and mode crosstalk (multiple modes carry energy) to improve communication quality

Method used

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  • Optical waveguide mode converter used for improving optical waveguide transmission characteristic
  • Optical waveguide mode converter used for improving optical waveguide transmission characteristic
  • Optical waveguide mode converter used for improving optical waveguide transmission characteristic

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Embodiment 1

[0044] see Figure 4 , this embodiment proposes an optical waveguide mode converter that improves the transmission characteristics of the optical waveguide. The converter includes a single-mode optical fiber (1), a section of coreless optical fiber with a ball lens (2) and a rectangular optical waveguide (3), and the end face of the single-mode optical fiber (1) is connected with a section of coreless optical fiber with a ball lens (2) , keep an effective distance L between the end face of the optical waveguide (3) and the ball lens 2 . The axial centers of the single-mode optical fiber (1), the axial centers of the coreless optical fiber (2) and the optical waveguide (3) are kept on the same horizontal straight line. Its working principle: almost all the optically transformed Gaussian beams are coupled into the fundamental mode of the optical waveguide, which can not only reduce the scattering loss of the optical waveguide due to roughness, but also solve the problem of mod...

Embodiment 2

[0046] This embodiment is basically the same as Embodiment 1, and the special features are as follows:

[0047] The mode converter parameter is, the length of the coreless fiber (2) is L 1 , the radius of the fiber optic ball is R, and the refractive index of the ball lens material is n 1 , the distance between the end face of the optical waveguide (3) and the ball lens is L 2 , the refractive index of the gap material between the ball lens and the optical waveguide (3) is n 2 , n 1 >n 2 , the value range of the parameter: L 1 200-236μm, R is 125-140μm, L 2 It is 947-1200μm.

[0048] join Image 6 , the coreless fiber with ball lens is packaged into a specially designed adapter (4), the width of the adapter is greater than 2 times the radius R of the ball lens, the incident end of the adapter has a stepped groove (5), and the size of the groove is the same as The size of the fiber jumper matches, so that the flat end of the fiber ball and the output end of the fiber ju...

Embodiment 3

[0051] see Figure 4 , this embodiment proposes a structural schematic diagram of an optical waveguide mode converter for improving optical waveguide transmission characteristics and its working principle.

[0052] An optical waveguide mode converter for improving the transmission characteristics of the optical waveguide, comprising a single-mode optical fiber (1), a section of coreless optical fiber with a ball lens (2) and a rectangular optical waveguide (3). The flat end of the coreless fiber (2) can be parallel-jointed or fused with the output end of the single-mode fiber (1), and the length of the coreless fiber is L 1 , the vertex of the spherical surface is facing the input end of the optical waveguide (3) and the distance L 2 , the spherical radius is R, and the refractive index of the spherical lens material is n 1 , the refractive index of the gap material between the ball lens and the optical waveguide is n 2 . The axis of the single-mode fiber, the axis of the ...

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Abstract

The invention relates to an optical waveguide mode converter used for improving an optical waveguide transmission characteristic. The converter comprises a single-mode optical fiber, a segment of coreless optical fiber with a ball lens and a rectangular optical waveguide. The end surface of the single-mode optical fiber is connected to one segment of coreless optical fiber with the ball lens. A segment of effective distance is kept between an optical waveguide end surface and the ball lens. The axis center of the single-mode optical fiber, the axis center of the coreless optical fiber and theaxis center of the optical waveguide are kept at a same horizontal straight line. Through the mode converter, the single-mode optical fiber can be converted to output a Gaussian light beam, and lightenergy is almost coupled to an optical waveguide base model so that an optical waveguide mode conversion function is reached; and optical waveguide scattering losses and mode crosstalk are reduced, and communication quality is increased.

Description

technical field [0001] The invention relates to the technical field of optical backplane interconnection, and provides an optical waveguide mode converter for improving the transmission characteristics of the optical waveguide. Background technique [0002] In recent years, with the urgent demand for high-speed bandwidth (above 50Gbps) in the fields of broadband communications, supercomputers, and big data centers, the optical backplane technology based on optical waveguide interconnection has become a research hotspot at home and abroad because of its high bandwidth, low energy consumption, With the advantages of no electromagnetic interference and low cost, it is very likely to become the mainstream communication method between sub-boards and backplanes, inside the backplane, and between modules in the future. [0003] In the existing technology, a multimode rectangular optical waveguide with a core diameter of 50 μm×50 μm is a commonly used structure, which is due to its ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/26G02B6/255G02B6/14
CPCG02B6/14G02B6/2552G02B6/262
Inventor 王廷云刘琳琳邓传鲁赵静轩张小贝董艳华庞拂飞
Owner SHANGHAI UNIV
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