Summary
A combination of bends and twists can rotate the state of polarisation of light in standard single mode optical fibre [1]. It has previously been proposed to use the effect to measure rotation angle [2], but there were practical difficulties due in part to the need for a linearly polarised optical input. By incorporating the rotator in a fibre loop reflector [3], an elegant angle sensor has now been designed which is independent of input polarisation state and which delivers the output as optical intensity. The paper describes the theory of operation and an experiment to verify the sensor design.
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References
J.N. Ross, The rotation of the polarisation in low birefringence monomode optical fibers due to geometric effects Optical & Quantum Electronics 16 pp 455–461 (1984)
K. Itoh, T. Saitoh and Y. Ohtsuka, Optical rotation sensing by geometric effect of fiber-loop twisting J. Lightwave Technol. 5(7) (1987) pp 916–919
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D.A. Chapman and D.W. Faulkner, Use of reflected light for low data rate upstream signalling in a single mode passive optical network, IEE Proc. Pt J 137(2) pp108–114 (1990)
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© 1995 Springer Science+Business Media New York
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Chapman, D.A., Gorham, D.A., Dickinson, G. (1995). Angle Measurement by Geometric Polarisation Rotation in a Fibre Loop Reflector. In: Lampropoulos, G.A., Chrostowski, J., Measures, R.M. (eds) Applications of Photonic Technology. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-9247-8_68
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DOI: https://doi.org/10.1007/978-1-4757-9247-8_68
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4757-9249-2
Online ISBN: 978-1-4757-9247-8
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