Method for detecting coupling crosstalk of high-nonlinearity optical fiber

Abstract

The invention discloses a high-nonlinearity optical fiber coupling crosstalk detection method, which comprises the following steps: dividing an optical fiber into equal-length sections, determining the electric field amplitude of each section, obtaining the electric field amplitude of the tail end of each section of the optical fiber, obtaining the coupling power of each section, evaluating the inter-core crosstalk of the whole optical fiber, determining the section length value through simulation, and introducing the nonlinearity characteristic; and observing the crosstalk change during the period, solving to obtain the electric field amplitude of each section where the nonlinear characteristic is introduced, calculating the threshold power and the critical power of the nonlinear coupler, and calculating the length of the nonlinear interaction according to the threshold power and the critical power of the nonlinear coupler. According to the method, the coupling mode theory is expanded to the nonlinear field from the sectional idea, the solution of the coupling mode equation of the nonlinear directional coupler (NLDC) is provided, and the inhibition effect of nonlinearity on linear coupling crosstalk is verified in a numerical solution simulation mode.

Description

technical field [0001] The invention relates to a detection method of crosstalk, in particular to a detection method of highly nonlinear optical fiber coupling crosstalk, which belongs to the field of optical communication. Background technique [0002] When the Shannon limit of single-core fiber is reached, the growth rate of channel capacity slows down. In this case, to overcome the capacity limitation of a single-core fiber, the space-division multiplexing (SDM) technology using multi-core fiber (MCF) is an attractive solution to overcome this capacity limitation. In SDM transmission using MCF media, a major physical defect is the mode coupling between fiber cores, the so-called inter-core crosstalk (IC-XT) phenomenon. In recent years, the inter-core crosstalk IC-XT in linear coupling has been considered The perturbation factors such as bending and torsion in the external environment of the optical fiber have been extensively studied. According to the coupling mode theor...

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Problems solved by technology

Existing technology In the study of nonlinear coupling, most of the existing experimental fibers are the switching effect in the short fiber. For the entire optical fiber transmission system, the influence of nonlinearity on the linear coupling crosstalk is only the power staying in the incident fiber core. The reservation and discussion of coupling to another fiber core have not yet involved the suppression of crosstalk in long-distance linear coupling

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