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Writing your thesis
March 2nd 2011Faisal Rafiq Mahamd Adikan
Department of Electrical Engineering
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Outline
Before you begin
Good practices
Bad practices
Assessment
Questions and Answers
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Before you begin
One writer – many readers
Burden on writer to communicate efficiently
Make a calculated judgment on how basic/advanced the thesiswill be
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Before you begin
Do the homework
Pick up a good thesis and see how things are done
Masters or PhD thesis should be OK
Start early
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Before you begin
Tell a story
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Before you begin
No limit to number of chapters, and how long a chaptershould be
Should fit into a nicely told story
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Good practices
Abstract : should be quantitative where possible
Describe results obtained
Do not put anything introductory in nature. Perhaps a sentenceor two would do
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Good practices
This thesis describes a series of experimental studies concerning waveguide structures based on the direct UV and direct grating
writing fabrication techniques. The latter approach allows simultaneous definition of waveguide structures and Bragg gratings.
The first result of this work describes the fabrication and characterisation of small angle X-couplers that exhibit low polarisation
and wavelength dependence. Maximum and minimum coupling ratios of 95% (±0.8%) and 1.9% (±1%) respectively with typical
excess loss of 1.0dB (±0.5dB) were recorded. Device modelling using Beam Propagation Method (BPM) and an analytical model
showed good agreement with experimental results over a broad crossing angle and wavelength range.
By introducing refractive index asymmetry in 2° X-couplers, it was possible to tune the response to give a 50:50 coupling ratio.
Multiple UV exposure experiments investigated the 'proximity effect' and provided further proof of the ability of UV writing to
produce raised waist index X-couplers.
A first order Bragg grating electrically tunable via liquid crystal index modification with a maximum tunability of 141 GHz at
1562nm (TM polarised) and 114 GHZ at 1561.8nm (TE polarised) using electro-patterned ITO coated glass electrodes is also
presented. The 141GHz tuning range effectively covers up to five 25 GHz WDM channel spacing and was achieved with 170Vpp
sinusoidal 1 kHz supply voltage. Hysteretic behaviour of the tuning curves was observed and is believed to be related to thedynamics of the disclination line formed along the waveguide axis with increase or decrease in supply voltage.
Finally, a description of the successful demonstration of UV-written single channels, y-splitters, and Bragg gratings into a novel
flat fibre substrate is provided. Utilising a series of Bragg gratings enabled assessment of the core layer uniformity and
birefringence.
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Good practices
Introduction : should introduce
The setting - overview
What is the problem you wish to solve
Objective(s) – those you need to fulfill to solve the above
problems
Thesis structure
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Good practices
The chapter previously known as ‘Literature Review’
There should NOT be any chapters called Literature Review
Should be ‘Introduction to ..’, or ‘Flat Fibres: A Brief Overview’
Should be scientifically thick
Show that you have read a lot
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Good practices
The chapter previously known as ‘Literature Review’
Use tables
Material
(typical refractive
index )+
Index
contrast n Waveguide fabrication
Typical propagation
loss Refs.
SiO2:Si
(SiO2 1.4 - 1.5,
Si 3.3 – 3.5)
5 - 7 (x 10-3)i. photolithography & etching
i i. direct UV writing 0.03 - 0.1dB/cm [4-6]
Lithium niobate
(LiNbO3 2.2) 10-3
i. zinc/titanium in-diffusion
ii. proton exchange0.1 – 1dB/cm [7]
Indium phosphide
(InP 3.3)Up to 0.1 i. photolithography & etching > 1dB/cm [3]
Polymers
(n 1.3 – 1.6)Up to 10-3
i. photolithography & etching
ii. laser ablation
iii. moulding/embossing
0.01dB/cm (= 840nm)
0.1dB/cm ( = 1550nm)[8]
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Good practices
The chapter previously known as ‘Literature Review’
Use flow diagrams (to indicate technology placing)
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Good practices
The chapter previously known as ‘Literature Review’
Use diagrams
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Good practices
Experimental configurations
Use diagrams and images : bring readers there
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Good practices
To indicate dynamic behaviors
Use composite graphs
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Good practices
To show dynamic behaviors
Use composite graphs
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Assessment
How your thesis will be assessed
Limit to 50-pages long (including diagrams, and tables)
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