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Few-mode optical fiber space mode field detection method based on interference theory

A technology of few-mode optical fiber and detection method, which is applied in the field of space division multiplexing optical fiber communication system and integrated optics, can solve the problem of difficulty in accurately measuring few-mode optical fiber-degenerate spatial mode, etc., and achieves a low-cost, high-precision mode Simple effects of ingredients and experimental equipment

Active Publication Date: 2020-07-10
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 spatial mode field detection method is difficult to accurately measure the most basic unit in the few-mode optical fiber—the degenerate spatial mode, and propose a detection method for the spatial mode field of the few-mode optical fiber based on interference theory

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  • Few-mode optical fiber space mode field detection method based on interference theory
  • Few-mode optical fiber space mode field detection method based on interference theory
  • Few-mode optical fiber space mode field detection method based on interference theory

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Embodiment Construction

[0030] Hereinafter, the present invention will be further described by taking a two-mode optical fiber as an example in conjunction with the accompanying drawings. The accompanying drawings are only for illustration purposes, and do not limit the scope of application of the present invention.

[0031] A few-mode optical fiber spatial mode field detection method based on interference theory, the brief process can be found in figure 1 . We first introduce the lower half of the flowchart, the theoretical part. Based on the few-mode fiber with given geometric parameters (including the shape and size of the few-mode fiber) and optical characteristic parameters (including the refractive index distribution and other physical parameters that affect its optical properties), calculate the number of modes it can support, and get Mode field distributions and propagation constants of these spatial eigenmodes. For simple optical fibers that can obtain analytical solutions, use analytical ...

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Abstract

The invention discloses a few-mode optical fiber space mode field detection method based on an interference theory. The method comprises the following steps: firstly, obtaining a mode component whichcan be supported by a to-be-tested optical fiber at a related wavelength through simulation software; then, based on the interference theory, extracting measurable characteristic parameters reflectingthe complex intensity of the degenerate mode; secondly, by establishing an equation set of the characteristic parameters and the degenerate mode complex intensity, obtaining the complex intensity ofeach degenerate mode from a physical image through algorithm processing, and designing a related algorithm to realize the idea. On the experimental level, a set of optical device for detecting an optical fiber emergent mode field is built, and a space image detector is used for recording mode spots; on the image detected by the space image detector, the complex intensity of the corresponding degenerate mode of each order can be obtained by applying the mode recovery algorithm. According to the method, the complex amplitude for restoring the degenerate mode can be calculated, and the method ismore accurate compared with a traditional method that only the module strength can be obtained.

Description

technical field [0001] The invention relates to a method for detecting the spatial mode field of a few-mode optical fiber based on interference theory, and belongs to the fields of space-division multiplexing optical fiber communication systems and integrated optics. Background technique [0002] Spatial mode is a specific spatial light field distribution that can exist stably in an optical fiber, and is divided into different angular orders and radial orders. Each spatial mode of different orders is orthogonal to each other and can be regarded as an independent transmission channel to increase the multiplexing dimension, thereby further improving the capacity of optical communication transmission. To make a certain mode an independent channel, the recovery and detection of the transmission signal in the channel should be realized at the output. In the space division multiplexing system, researchers at home and abroad have proposed a variety of light field detection methods...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/079H04B10/075
CPCH04B10/079H04B10/075
Inventor 刘艳格毛百威郭慧毅张红伟王志刘波张昊
Owner NANKAI UNIV
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