This thesis presents several advances in the technology and applications of
photonic crystal �bres achieved over the last three years. Chapters 1 and 2
give the background material important to understand the results presented
in chapters 3, 4 and 5.
In chapter 1, linear properties of optical �bres are described. This chapter
focuses particularly on how the engineering of the cladding structure of solid
core photonic crystal �bres can be used to vary the �bre properties, most
importantly the group index and dispersion. Propagation in all-solid photonic
bandgap �bres is also discussed in terms of the anti-resonant re
Chapter 2 introduces the nonlinear optical e�ects that are important to understand
the work presented in chapters 4 and 5.
In chapter 3, a method to reduce bend losses in all-solid photonic bandgap
�bres is outlined. The reduction of these losses is achieved by redesigning
the high-index inclusions in the cladding structure to suppress cladding modes
that strongly couple to the fundamental core-guided mode when the �bre is
In chapter 4, a method of tapering photonic crystal �bres in order to decrease
the dispersion along their length is described. The tapers are used to compress solitons via adiabatic soliton compression and a combination of adiabatic
soliton compression and soliton e�ect compression, achieving a factor
of 15 compression of a transform-limited pulse to below 50 fs.
Chapter 5 describes how engineering the cladding structure of photonic crystal
�bres can be used to generate shorter frequencies in supercontinuum generation.
The method by which this achieved is experimentally veri�ed and then
exploited to generate a continuum incorporating the entire visible spectrum
using low cost, low maintenance pump sources.
|Date of Award||1 Apr 2009|
|Supervisor||Jonathan Knight (Supervisor)|
- Photonic crystal fibres
- nonlinear optics