OPTICAL FIBRE AND METHOD OF MEASURING POLARISATION MODAL DISPERSION OF OPTICAL FIBRE Russian patent published in 2008 - IPC G02B6/02 G01M11/02 

FIELD: physics.

SUBSTANCE: length of beats L_bt is measured when optical fibre is wound on a coil. The average bond length L_b is measured when the optical fibre is in form of an optical cable. Polarisation modal dispersion (PMD) is calculated when the optical fibre is in form of optical cable, using equation (1) for the section of the optical fibre for which there is no connection between polarisation modes, and using equation (2) for all lengths of optical fibre; where λ - is the optical wavelength and C - is speed of light. The optical fibre has a core and a fibre shield around the core, in which polarisation modal dispersion, measured using the method of measuring polarisation modal dispersion (PMD) of optical fibre, is equal to or less than The fibre optical cable, in which there are several covered optical fibres, has a protective layer around the optical fibre and is placed side by side. The covered optical fibres are put into the cable shield.

EFFECT: design of a method of measuring polarisation modal dispersion of optical fibre, through which polarisation modal dispersion of optical fibre can be evaluated after assembling into an optical cable, when the fibre is wound into a coil for transportation.

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