METHOD OF MONITORING CHARACTERISTICS OF OPTICAL FIBERS OF FIBER-OPTIC COMMUNICATION LINES AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2024 - IPC G01M11/02 H04B10/00 

FIELD: measuring equipment.

SUBSTANCE: invention relates to measurement equipment in fiber-optic transmission systems with spectral division of channels. Technical result is achieved by the fact that when monitoring characteristics of fiber-optic communication line (FOCL) optical fiber (OF), phase shift φ(γ) is measured at each selected for measurement nominal wavelengths λ_a, ..., λ_d, recorded measured values of phase shift are compared with dependence of average value of chromatic dispersion coefficient on wavelength D_cp(λ), functional dependence φ(γ) is selected, calculating the relative delays for all wavelengths λ₁, λ₂, ..., λ_j, ..., λ_k, clarifying the functional dependence φ(γ) by using the results of measuring the phase shift at nominal wavelengths λ_f, ..., λ_l ∈ λ_i, ..., λ_j and λ_a, ..., λ_d ≠ λ_f, ..., λ_i at subsequent time intervals T_z, wherein the FOCL OF characteristics monitoring device consists of three optical and one electrical switch, an optical multiplexer and a demultiplexer, a pulse generator, two sinusoidal signal generators, two optical splitters, two attenuators, five photodiodes, three amplifiers, a phase meter and a controller.

EFFECT: improving control accuracy and reducing time expenditures for switching to a standby optical fiber (OF) with the best parameters from a group of standby OF of fiber-optic communication lines (FOCL) at deterioration of quality of information signals transmission along the main OF.

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