A fibre-optic frequency shifter utilizing travelling flexure waves in birefringent fibre
作者:
C.N.Pannell,
R.P.Tatam,
J.D.C.Jones,
D.A.Jackson,
期刊:
Journal of the Institution of Electronic and Radio Engineers
(IET Available online 1988)
卷期:
Volume 58,
issue 5S
页码: 92-98
年代: 1988
DOI:10.1049/jiere.1988.0042
出版商: IERE
数据来源: IET
摘要:
A fibre-optic frequency shifter based on the use of flexure waves to produce a travelling perturbation which couples the polarization modes of birefringent optical fibre is described. In experiments, frequency shifts of about 790 kHz were produced. A dispersion relation for the flexure waves in the fibre has been derived and was shown to be valid in experiments. The device is described using coupled mode theory, and it is shown that optimum mode coupling will occur when the wavelength of the flexure waves is twice the birefringent beat length of the fibre.
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