Measurement of chromatic dispersion in optical fibres using a common path polarisation interferometer

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Measurement of chromatic dispersion in optical fibres using a common path polarisation interferometer

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A technique is presented for accurately measuring the dispersion in single-mode fibres about a kilometre in length. It uses a polarisation interferometer and is simpler and less expensive than techniques currently being used. The interferometer incorporates a phase modulator and a test fibre. The dispersion is determined from the interference fringe seen when a sweep RF signal is applied to the modulator. The equipment is less bulky than that currently used for testing, so it can easily be carried into the field. Chromatic dispersion was measured with ps resolution in a 1 km-long single-mode fibre at wavelengths from 1.50–1.58 μm.

Inspec keywords: optical fibre testing; optical fibre polarisation; phase modulation; light interferometers; optical fibre dispersion; optical modulation

Other keywords: 1.50 to 1.58 micron; phase modulator; chromatic dispersion measurement; common path polarisation interferometer; sweep RF signal; optical fibres; single-mode fibres; 1 km; test fibre; measurement resolution; interference fringe

Subjects: Optical propagation, dispersion and attenuation in fibres; Optical fibre testing and measurement of fibre parameters; Fibre optics; Other fibre optical properties; Optical interferometry

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