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Photonics Systems Group Photonics Systems Group Projects R.J. Manning Fatima Gunning Cleitus Antony Giuseppe Talli

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Presentation on theme: "Photonics Systems Group Photonics Systems Group Projects R.J. Manning Fatima Gunning Cleitus Antony Giuseppe Talli"— Presentation transcript:

1 Photonics Systems Group Photonics Systems Group Projects R.J. Manning Fatima Gunning Cleitus Antony Giuseppe Talli

2 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

3 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 2  m 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)

4 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)

5 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

6 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

7 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

8 Optically Amplified Links The signal is amplified in the optical domain –No high-speed electronics is required Multi channel Bit rate independent TxRx ~80 km N × 80 km Optical Amplifier

9 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 TxRx ~80 km N × 80 km Raman Pump Laser

10 Raman Amplification for Fibre to the Home Applications TxRx 60 km Raman 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

11 Project 3: Characterisation and applications of 2µm lasers 4 th year project (12 weeks) Fatima Gunning, Hongyu Zhang Photonic Systems Group Tyndall National Institute

12 Can 2µm be the 4 th transmission window? fibre lasers detectors filters

13 Full optical high-speed systems tesbed MODEGAP meeting, Aston, 3 rd /4 th October th year project: Characterisation and applications of 2µm lasers (slotted Fabry-Perot lasers)

14 2µm systems – 2013 Selecting Eblana lasers s available s requested old lasers MODEGAP meeting, Aston, 3 rd /4 th October 2013

15 Typical laser characterisation MODEGAP meeting, Aston, 3 rd /4 th October 2013

16 Objectives Understanding operational principle of slotted Fabry-Perot lasers Analysis of threshold current Tuneability against temperature High speed data characterisation

17 Project 4: Optical frequency shifter Semiconductor Optical Amplifiers (SOA)

18 Project description SOAs are very NONLINEAR When subject to high intensity light, their refractive index changes This can be used to impart a time-dependent phase change (or frequency shift) on a continuous wave (cw) light beam This can the be the basis of a frequency shifter Project consists of : 1)Modelling of phase and frequency shifts using Fourier theory 2)Experimental measurements to directly observe achievable phase shifts

19 Please Visit! For further information or if you would like to visit our labs


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