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Bragg grating filters for optical networks

Bragg grating filters for optical networks
Bragg grating filters for optical networks
This thesis focuses on the exploitation of fibre Bragg gratings in optical communication networks. New designs, as well as procedures for dynamically altering grating characteristics are proposed for several important functions. We begin with designing gratings for flattening the gain profile of an erbium-doped fibre amplifier. The design process uses an alternative method to the inverse scattering method, but produces a similar spectral response quality. These
gratings have either modulated refractive index or chirp rate. Then, we propose a
reconfigurable phase-code encoder. The device is composed of a uniform grating,
with a number of equidistant fine wires for the purpose of modulating the phase
via the thermo-optic effect. Error free data transmission is demonstrated in
several optical code-division multiple access architectures. The characteristics of
the device are also theoretically modelled. Next, we construct a simple package
for continuous tuning of fibre gratings, which adopts the beam bending technique.
It demonstrates over 110 nm tuning range and the operational wavelength can be
accurately predicted. Its spectral response and limitations are also studied. This
device has been incorporated into several optical systems, which include tunable
distributed feedback fibre laser, add-drop multiplexer and high power fibre laser.
Finally, we present a package for varying the dispersion of a fibre grating. The
package deforms a beam into a cubic function shape with a contra-flexure point
at the middle. Consequently, this allows changes in the grating delay
characteristic without shifting its centre wavelength. This device has achieved
dispersion compensation of an 80 km non-zero dispersion-shifted fibre in a 10
Gb/s system. Additionally, since its bandwidth also changes with the stress
gradient, it has also been utilised as a bandwidth-variable bandpass filter at the
receiving terminal of a spectrum-sliced wavelength-division multiplexed system.

Mokhtar, Mohd Ridzuan
4cf286e4-bfb9-422b-9236-2567dd6e88dc
Mokhtar, Mohd Ridzuan
4cf286e4-bfb9-422b-9236-2567dd6e88dc

Mokhtar, Mohd Ridzuan (2005) Bragg grating filters for optical networks. University of Southampton, Faculty of Engineering and Applied Science, Optoelectronics Research Centre, Doctoral Thesis, 162pp.

Record type: Thesis (Doctoral)

Abstract

This thesis focuses on the exploitation of fibre Bragg gratings in optical communication networks. New designs, as well as procedures for dynamically altering grating characteristics are proposed for several important functions. We begin with designing gratings for flattening the gain profile of an erbium-doped fibre amplifier. The design process uses an alternative method to the inverse scattering method, but produces a similar spectral response quality. These
gratings have either modulated refractive index or chirp rate. Then, we propose a
reconfigurable phase-code encoder. The device is composed of a uniform grating,
with a number of equidistant fine wires for the purpose of modulating the phase
via the thermo-optic effect. Error free data transmission is demonstrated in
several optical code-division multiple access architectures. The characteristics of
the device are also theoretically modelled. Next, we construct a simple package
for continuous tuning of fibre gratings, which adopts the beam bending technique.
It demonstrates over 110 nm tuning range and the operational wavelength can be
accurately predicted. Its spectral response and limitations are also studied. This
device has been incorporated into several optical systems, which include tunable
distributed feedback fibre laser, add-drop multiplexer and high power fibre laser.
Finally, we present a package for varying the dispersion of a fibre grating. The
package deforms a beam into a cubic function shape with a contra-flexure point
at the middle. Consequently, this allows changes in the grating delay
characteristic without shifting its centre wavelength. This device has achieved
dispersion compensation of an 80 km non-zero dispersion-shifted fibre in a 10
Gb/s system. Additionally, since its bandwidth also changes with the stress
gradient, it has also been utilised as a bandwidth-variable bandpass filter at the
receiving terminal of a spectrum-sliced wavelength-division multiplexed system.

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Published date: 2005
Organisations: University of Southampton

Identifiers

Local EPrints ID: 15462
URI: https://eprints.soton.ac.uk/id/eprint/15462
PURE UUID: f7bff0b9-8dab-4bb8-9909-214ab574bb1c

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Date deposited: 19 Apr 2005
Last modified: 17 Jul 2017 16:49

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