This article is cited in 6 papers

Fibre optics

Phase delay of polarisation modes in elastically twisted spun fibres

S. K. Morshnev, Yu. K. Chamorovsky, I. L. Vorob'ev

Kotelnikov Institute of Radioengineering and Electronics, Fryazino Branch, Russian Academy of Sciences

Abstract: The evolution of the phase delay between linearly polarised orthogonal modes in a spun fibre elastically twisted around its axis has been studied experimentally and theoretically using a model for a helical structure of the built-in linear birefringence axes. The phase delay is a sinusoidal function of elastic twist angle, with an amplitude and period dependent on fibre parameters: spin pitch and built-in linear birefringence beat length. It is shown that, at a known spin pitch, phase delay versus elastic twist angle data can be used to determine the beat length of built-in linear birefringence in the range 0.01 to 100 mm. The theoretical analysis results are supported by experimental data for conventional and microstructured spun fibres.

PACS: 42.81.Cn, 42.81.Gs, 42.81.Pa

Received: 03.02.2011

 English version: Quantum Electronics, 2011, 41:5, 469–474

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