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Photonics Systems Group

Photonics Systems Group. Photonics Systems Group Projects R.J. Manning Fatima Gunning Cleitus Antony Giuseppe Talli bob.manning@tyndall.ie. Photonics Systems Group. Photonics Systems Group (PSG) State-of-the-art photonics laboratory Internationally recognised research

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Photonics Systems Group

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  1. Photonics Systems Group Photonics Systems Group Projects R.J. Manning Fatima Gunning Cleitus Antony Giuseppe Talli bob.manning@tyndall.ie

  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 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)

  4. Today’s Telecommunication Networks Optical access network (i.e. “fibre broadband”) is currently being deployed across the world in different flavours Fibre Access Network (Last/First mile) Copper

  5. 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 Optical Modulator Photo-detector Optical Fibre t t

  6. 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 • Pulse broadening or compression Optical Modulator LASER Photo-detector Optical Fibre t 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. The signal is amplified in the optical domain No high-speed electronics is required Multi channel Bit rate independent Optically Amplified Links Optical Amplifier N × 80 km ~80 km Tx Rx

  9. 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 Raman Optically Amplified Links Raman Pump Laser N × 80 km ~80 km Tx Rx

  10. Raman Amplification for Fibre to the Home Applications 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 60 km Tx Rx 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 lasers4th year project (12 weeks) Fatima Gunning, Hongyu Zhang Photonic Systems Group Tyndall National Institute

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

  13. Full optical high-speed systems tesbed 4th year project: Characterisation and applications of 2µm lasers (slotted Fabry-Perot lasers) MODEGAP meeting, Aston, 3rd/4th October 2013

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

  15. Typical laser characterisation MODEGAP meeting, Aston, 3rd/4th 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 : Modelling of phase and frequency shifts using Fourier theory Experimental measurements to directly observe achievable phase shifts

  19. Please Visit! • For further information or if you would like to visit our labs giuseppe.talli@tyndall.ie cleitus.antony@tyndall.ie bob.manning@tyndall.ie fatima.gunning@tyndall.ie

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