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A Fast Vector Analysis Method for Multicore Waveguide Transmission Characteristics

A technology of transmission characteristics and vector analysis, applied in optical components, instruments, optics, etc., can solve problems such as mode field evolution of difficult-to-length multi-core waveguides, and achieve the effect of saving computing costs

Active Publication Date: 2021-08-24
NANKAI UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problem that the current traditional numerical simulation method is difficult to quickly and accurately calculate the mode field evolution in the long multi-core waveguide under the complex vector mode field input, and propose a fast vector Analytical method

Method used

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  • A Fast Vector Analysis Method for Multicore Waveguide Transmission Characteristics
  • A Fast Vector Analysis Method for Multicore Waveguide Transmission Characteristics
  • A Fast Vector Analysis Method for Multicore Waveguide Transmission Characteristics

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Embodiment Construction

[0030] Below in conjunction with the accompanying drawings, the present invention will be further described by taking a mode division multiplexing coupler based on a multi-core waveguide to realize multiplexing of 16 orbital angular momentum (OAM) modes as an example. The accompanying drawings are only for illustrative purposes, not limitations Scope of application of the present invention.

[0031] First, the eigenmodes of the multi-core waveguide are solved by numerical calculation method. In this example, we build in the finite element analysis software figure 2 The model of the mode division multiplexing coupler to be analyzed is shown. The mode division multiplexing coupler is a 9-core waveguide structurally, and the refractive index distribution of the annular core 9 located in the center of the section is expressed by the following formula

[0032]

[0033]

[0034] R and W in the formula are geometric parameters, which are 7.6 microns and 3.8 microns respectiv...

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Abstract

A fast vector analysis method for the transmission characteristics of multi-core waveguides. Including: calculating the mode field distribution of all eigenmodes and the propagation constants of all eigenmodes of the multi-core waveguide by numerical calculation or analytical solution; analyzing the mode components of the incident mode field by calculating the overlap integral, and decomposing the incident mode field It is the form of coherent superposition of eigenmode mode fields; calculate the phase change of each eigenmode after a certain transmission length, and obtain the phase of each eigenmode after a certain distance of transmission; the eigenmode mode field is calculated according to the phase and amplitude Coherent superposition is carried out to obtain the mode field after a certain distance transmission. The method of the invention only needs to perform eigenmode analysis on the cross section of the waveguide, which greatly saves the calculation cost; at the same time, the invention only includes the error of the eigenmode calculation method itself, and has the advantage that the calculation error does not accumulate with the increase of the waveguide length. The invention is an efficient and accurate analysis method for multi-core waveguides with complex shapes.

Description

technical field [0001] The invention relates to a fast vector analysis method for transmission characteristics of a multi-core waveguide, which is widely used in space division multiplexing optical fiber communication systems and integrated optical design. Background technique [0002] Multicore waveguides are one of the most common basic structures in optical communication systems. In the space division multiplexing optical fiber communication system, the multi-core optical fiber is a strong competitor of the next-generation optical fiber communication medium; on the other hand, the mode coupling phenomenon formed when multiple independent waveguides approach each other makes the multi-core waveguide have rich transmission characteristics. It can be used for mode regulation and wavelength division multiplexing, etc. The geometric characteristics of different cores, the distance between the cores and the refractive index of the cores in a multi-core waveguide have a signifi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/00
CPCG02B27/0012
Inventor 刘艳格郭慧毅张红伟毛百威王志刘波张昊
Owner NANKAI UNIV
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