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A vortex beam mode conversion coupler and its manufacturing method

A technology of mode conversion and vortex beam, which is applied in the coupling of optical waveguide, instrument, optics, etc., can solve the problem of changing process without involving mode conversion, mode energy and mode field, conversion efficiency, high manufacturing process requirements, high wavelength dependence, etc. problems, to achieve good promotion and use value, small size, and high conversion efficiency

Active Publication Date: 2020-10-16
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Optical fiber mode coupler is a fiber optic device that transmits, distributes, and converts signal modes. The more common photonic crystal fiber mode converters can achieve high extinction ratio mode conversion, but the production process requires high
There is also a mode conversion coupler based on fiber gratings. Although the structure of this device is relatively simple, it has a high dependence on wavelength and a narrow working bandwidth. The converted high-order mode and fundamental mode are transmitted in the same optical fiber, so the mode large crosstalk
In 2014, Ismaeel et al. proposed a mode conversion coupler based on a weakly fused tapered method to convert the fundamental mode in a single-mode fiber to a higher-order mode in a few-mode fiber, but its research was relatively preliminary and did not involve Research on the change process of mode energy and mode field and conversion efficiency in the mode conversion process

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  • A vortex beam mode conversion coupler and its manufacturing method
  • A vortex beam mode conversion coupler and its manufacturing method
  • A vortex beam mode conversion coupler and its manufacturing method

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Embodiment 1

[0060] Such as figure 1 As shown, an implementation case model of the present invention includes a single-mode fiber 2, a few-mode fiber 3 and packaging materials. This mode conversion coupler is a directional coupler. The single-mode fiber 2 adopts a standard single-mode fiber. The refractive index difference between the cladding layers in the few-mode fiber 3 is 0.013. The refractive index of the few-mode fiber core 31 is the inner few-mode Half of the refractive index of the cladding 32 , the diameter of the few-mode core 31 is 5 μm, the diameter of the inner few-mode cladding 32 is 15 μm, and the diameter of the outer few-mode cladding 33 is 125 μm. The signal light is input from the input end of the single-mode fiber 2, passes through the coupling part 1, outputs the fundamental mode beam from the output end of the single-mode fiber 2, and outputs the high-order mode beam from the output end of the few-mode fiber 3.

[0061] according to the above figure 1 As shown in t...

Embodiment 2

[0064] The manufacturing method steps of the vortex beam mode conversion coupler are as follows:

[0065] 1) A few-mode optical fiber 3 with a high refractive index ring is produced by the modified chemical vapor deposition method (MCVD), and its parameter requirements are: the core diameter is 5 μm, the inner cladding diameter is 15 μm, and the outer cladding diameter is 125 μm. The refractive index difference between the inner cladding and the cladding of the few-mode fiber 3 is 0.027, and the refractive index of the core is the same as that of the outer cladding.

[0066] 2) According to the drawn few-mode fiber 3 and the beam propagation method, the theoretical calculation and modeling simulation of the fiber mode conversion coupler are carried out.

[0067] 3) According to the simulation results, the mode conversion coupler is drawn. At this time, the drawing parameters are: twist and number of turns per turn, diameter of single-mode optical fiber 2 after pre-drawing is ...

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Abstract

The invention provides a vortex light beam mode conversion coupler and a manufacturing method thereof. A single-mode fiber is fused with a few-mode fiber in a certain area, and a fundamental mode in the single-mode fiber can be accurately controlled to be coupled to a high-order model in the few-mode fiber. Through adjusting the polarization state of input fundamental mode light in the single-modefiber, a specific high-order OAM mode can be generated in the few-mode fiber and a fused biconical taper type vortex light beam mode conversion coupler is formed. The coupler has advantages that thesize is small; consumed materials are less; the coupler is easy to produce; stability is high; and a suitable wave band is wide and conversion efficiency is high and so on. The coupler is the important part of all-fiber communication, can be taken as the front-end device of die division multiplexing, can be taken as the mode conversion device of a vortex laser and a vortex amplifier and can also be taken as one part of a fiber sensing device, and has a good popularization and usage value.

Description

technical field [0001] The invention belongs to the technical field of optical fiber communication, and in particular relates to a vortex beam mode conversion coupler and a manufacturing method thereof. Background technique [0002] Nowadays, with the rapid development of the information age, technologies such as wavelength division multiplexing, time division multiplexing, space division multiplexing, polarization multiplexing and coherent reception have been adopted successively, and people's research on the capacity of communication systems has reached the Shannon limit. , The huge amount of information brought by communication has forced us to make efforts in a new direction. In order to further improve communication capacity, space division multiplexing systems based on mode division multiplexing and core division multiplexing have been proposed and studied in depth in recent years. The mode multiplexing theory utilizes the orthogonality of each mode in the few-mode fi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/14G02B6/255
CPCG02B6/14G02B6/2551
Inventor 文建湘王廷云邢建飞贺心雨董艳华庞拂飞曾祥龙陈振宜
Owner SHANGHAI UNIV