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Realization of chirped fibre Bragg gratings by strain gradients and their applications for fibre dispersing compensation

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dc.contributor.advisor Prof. S.J. Spammer en_US
dc.contributor.author Zhu, Yinian
dc.date.accessioned 2012-09-05T12:44:25Z
dc.date.available 2012-09-05T12:44:25Z
dc.date.issued 2012-09-05
dc.date.submitted 1998
dc.identifier.uri http://hdl.handle.net/10210/7040
dc.description M.Phil. en_US
dc.description.abstract Linearly chirped fibre Bragg gratings can be used to compensate dispersions in a fibre transmission system. Various methods have been developed to chirp fibre gratings. It is proposed that a uniform period grating can be chirped by applying an axially linear strain gradient. In this project, we shall demonstate a novel method for making chirped fibre Bragg gratings, which involves bonding an unchirped fibre Bragg grating of 5cm length to the surface of a tapered stainless steel plate which is strained by bending or dilating. This allows a strain gradient to be formed along the grating length through the transferring of strains from the plate to the fibre. The profiles of tapered stainless steel plates have been determined by means of the finite element method and computer simulations to establish the strain gradient during loading. Ten conventional resistive strain gauges are also bonded on the other surface for strain measurements. Because of the strain gradient, the local Bragg wavelength is a function of the position along the length of the fibre grating so that the grating chirp is an automatic consequence of the strain gradient. This method provides the dynamic control of Bragg wavelength shift, peak reflectivity and spectral bandwidth, and its tunability is also suitable for optimising pulse compression and optical fibre dispersion compensation. Using couple-mode equations, we have also calculated the reflection response of a chirped fibre grating. It is shown that the close agreement between the theoretical and the experimental results suggests that the strain gradient technique provides good control of the Bragg grating chirp and the center wavelength of a chirped fibre Bragg grating. en_US
dc.language.iso en en_US
dc.subject Optical fibers en_US
dc.subject Optical detectors en_US
dc.subject Diffraction gratings en_US
dc.title Realization of chirped fibre Bragg gratings by strain gradients and their applications for fibre dispersing compensation en_US
dc.type Thesis en_US

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