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Www.tyndall.ie Photonics Systems Group Photonics Systems Group Projects R.J. Manning Fatima Gunning...
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www.tyndall. ie Photonics Systems Group Photonics Systems Group Projects R.J. Manning Fatima Gunning Cleitus Antony Giuseppe Talli [email protected]
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Transcript of Www.tyndall.ie Photonics Systems Group Photonics Systems Group Projects R.J. Manning Fatima Gunning...
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Photonics Systems Group
Photonics Systems Group Projects
R.J. ManningFatima GunningCleitus AntonyGiuseppe Talli
www.tyndall.ie
Photonics Systems Group
Photonics Systems Group (PSG) State-of-the-art photonics laboratory Internationally recognised research Uses an enormous range of
disciplines, from basic Physics to applied Electrical Engineering
www.tyndall.ie
Projects
Project 1: Chirp Characterisation of Optical Modulators Dr Giuseppe Talli and Dr Cleitus Antony (12 weeks)
Project 2: Raman Amplification for Fibre-to-the-home networks Dr Giuseppe Talli and Dr Cleitus Antony (6 weeks)
Project 3: Characterisation of 2mm lasers Dr Fatima Gunning and Dr Hongyu Zhang (12 weeks)
Project 4: Optical frequency shifter based on a semiconductor optical amplifier Dr Bob Manning (6 or 12 weeks)
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Today’s Telecommunication Networks
Fibre
Copper
Optical access network (i.e. “fibre broadband”) is currently being deployed across the world in different flavours
Access Network(Last/First mile)
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t
Project 1:Chirp in Optical Modulators
• Chirp in optical modulators changes the frequency (hence wavelength) of the optical signal
• Due to chromatic dispersion in fibre the different frequencies travel at different speeds
LASER
t
Optical Modulator
Optical Fibre
Photo-detector
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Chirp in Optical Modulators
t
• Chirp in optical modulators changes the frequency (hence wavelength) of the optical signal
• Due to chromatic dispersion in fibre the different frequencies travel at different speeds
• Pulse broadening or compression
LASER Optical Modulator
Optical Fibre
Photo-detector
t
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Optical Modulators Chirp Characterisation
Project Description:• Characterise experimentally the chirp of different modulators:
– Mach-Zehnder Modulator– Electro-absorption Modulator– Integrated Semiconductor Optical Amplifier Electro-absorption
Modulator• Analyse the performance of the modulators in a fibre communication
systems– Numerical modelling using commercial software tools – Experimental characterisation of fibre transmission
• No. of Students:– 1 or 2
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Optically Amplified Links
• The signal is amplified in the optical domain– No high-speed electronics is required
• Multi channel• Bit rate independent
Tx Rx
~80 km N × 80 kmOptical Amplifier
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Raman Optically Amplified Links
• The same optical fibre used for transmission can be used to provide optical gain– Raman Amplification
• Very attractive as it can reduce the equipment deployed in the field
Tx Rx
~80 km N × 80 kmRaman Pump
Laser
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Raman Amplification for Fibre to the Home Applications
Tx Rx
60 kmRaman Pump
Laser• Explore the use of Raman
amplification for fibre to the home (FTTH) communication links– Different wavelength from long
reach systems (1.3mm)– Newly developed pump lasers
Project Description:• Experimental characterisation of the Raman gain • Analyse the overall performances of the FTTH communication link
– Numerical modelling using commercial software tools • No. of Students:
– 1
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Project 3:Characterisation and applications of 2µm lasers
4th year project (12 weeks)
Fatima Gunning, Hongyu Zhang
Photonic Systems GroupTyndall National Institute
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Can 2µm be the 4th transmission window?
fibre
lasers
detectors
filters
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Full optical high-speed systems tesbed
MODEGAP meeting, Aston, 3rd/4th October 2013
4th year project:Characterisation and applications of 2µm lasers(slotted Fabry-Perot lasers)
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2µm systems – 2013Selecting Eblana lasers
1800 1900 2000 2100 22000
25
50
75
100
Loss
(dB
/km
)
Wavelength (nm)
PBGF-72
-48
-24
0
TDFA
Pow
er (
dBm
) s availables requestedold lasers
MODEGAP meeting, Aston, 3rd/4th October 2013
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Typical laser characterisation
MODEGAP meeting, Aston, 3rd/4th October 2013
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Objectives
• Understanding operational principle of slotted Fabry-Perot lasers
• Analysis of threshold current
• Tuneability against temperature
• High speed data characterisation
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Project 4: Optical frequency shifter
Semiconductor Optical Amplifiers (SOA)
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Project description
SOAs are very NONLINEARWhen subject to high intensity light, their refractive index changesThis can be used to impart a time-dependent phase change (or frequency shift) on a continuous wave (cw) light beamThis can the be the basis of a frequency shifter
Project consists of :1) Modelling of phase and frequency shifts using Fourier theory2) Experimental measurements to directly observe achievable phase
shifts
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