CEIS School Seminar 22/02/12 Improving the Data Rates of Organic Light Emitting Diodes Andrew...
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CEIS School Seminar 22/02/12
Improving the Data Rates of Organic Light Emitting Diodes
Andrew Burton, Yr 2
Supervisors
Dr. Hoa Le Minh
Prof. Z. Ghassemlooy
CEIS School Seminar
What are Organic LEDs?
Substrate (Glass, plastic)
Anode (+’ve)
Conductive Layer (Organic Molecules or Polymers)
Emissive Layer (Organic Molecules or Polymers)
Cathode (-’ve)
CEIS School Seminar
OLED Electrical Model
R d
R p
C
Rp = Contact resistance of electrodesRd = Diode resistanceC = Diode capacitance
CEIS School Seminar
OLED testing and Characterisation
Test 2: Device Linearity
0 2 4 6 8 100
2
4
6
8
10
12
14Vrec with Vtx for the OSRAM OLED
Vtx (V pk-pk)
Vrx
(m
V p
k-p
k)
IDC=100mAIDC=150mAIDC=200mAIDC=250mAIDC=300mA
Test 1: Illumination Test 3: Bandwidth
101
102
103
-10
-8
-6
-4
-2
0System Bandwidth
Frequency (kHz)
No
rm
alis
ed
am
pli
tud
e (
dB
)
Test 4: Bit Error Rate
100 200 300 400 50010
-2
10-1
100 BER of OSRAM OLED
Rb (kbps)
BE
R
0 100 200 300 400 5000
100
200
300
400
500
600
700
800
Bias Current (mA)
Illu
min
an
ce (
Lu
x)
Illuminance at 10 cm for OSRAM OLED
CEIS School Seminar
Post Analogue RC Equalization
101
102
103
-10
-8
-6
-4
-2
0System Bandwidth
Frequency (kHz)
No
rm
ali
se
d a
mp
litu
de
(d
B)
CEIS School Seminar
RC Equalisation Results
100 200 300 400 50010
-2
10-1
100 BER of OSRAM OLED
Rb (kbps)
BE
R
Eq1Eq2Raw
CEIS School Seminar
Conclusions
RC analogue equalisation is not suitable for systems running at low data rates
With DFE equalization we can achieve error free communications up to 500 kbps
With OFDM we can achieve error free communications in excess of 3 Mbps
The financial support received from the schoolof Computing, Engineering and Information Sciences at the University of Northumbria
CEIS School Seminar
Acknowledgements
Fellow author and researcher Paul Anthony Haigh
MATLAB Guru Dr. Sujan Rajbhandari
CEIS School Seminar
PublicationsJournal1. H. Le Minh, Z. Ghassemlooy, A. Burton, P.A. Haigh, S.K. Liaw, “Experimental Study of
the equalisation for Organic Light Emitting Diodes in Visible Light Communications”, 2011.
Conferences 2. A. Burton, C. Amiot, H. Le Minh and Z. Ghassemlooy, “Design of an integrated optical
receiver for mobile visible light communications” 12th Annual Symposium on the Convergence of Telecommunications, Networking and Broadcasting, Liverpool, 2011, pp.286-289
3. H. Le Minh, Z. Ghassemlooy, A. Burton, and P. A. Haigh, "Equalization for organic Light Emitting Diodes in Visible Light Communications," IEEE Global Communications Conference 2011 (IEEE GLOBECOM 2011), Workshop on Optical Wireless Communications in Houston, USA, 5-9 December, 2011.
Posters 4. A. Burton, “Smart White LED based Lighting and Communications”, Northumbria
Research forum, Newcastle upon Tyne, 2011 5. A. Burton, “Visible Light Communications using Organic Light Emitting Diodes”, EPRSC
Photonics Communications Workshop, Oxford, 2011
CEIS School Seminar
Publications (under review & writing)
Conferences 6. A. Burton, H. Le Minh , Z. Ghassemlooy, S. Rajbhandari ,P. A. Haig “Smart Receiver for
Visible Light Communications: Design and Analysis” CSNDSP 2012, Poland7. A. Burton, H. Le Minh, Z. Ghassemlooy “Smart Visible Light Communications Receiver ”
IEEC 2012, Vietnam
Journal8. A. Burton, P.A. Haigh, H. Le Minh, Z. Ghassemlooy , S. Rajbhandari and S.K. Liaw,
“Increasing Data Rates in Organic Light Emitting Diodes for Visible Light Communications” , IEEE Journal of Light wave Technology
9. A. Burton, H. Le Minh, Z. Ghassemlooy , S. Rajbhandari and S.K. Liaw, “The Full Design and analysis of a Smart Receiver for Visible Light Communications”, IET- Communications
CEIS School Seminar
Awards
1. Full Studentship from the School of Computing, Engineering and information Sciences Northumbria University to carry out my Ph.D.
2. Awarded best performing first year PhD student for the School of Computing, Engineering and information Sciences, May 2011
3. IEEE UK & RI Communications Chapter Tutorial grant for “Protection Switching in Communication Networks”, 16th European Conference on Networks and Optical Communications, 2011
4. IEEE Travel grant for Wavelet transform workshop, Northumbria University, 2011