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Fragkos A.,National and Kapodistrian University of Athens | Bogris A.,Technological Educational Institute of Athens | Syvridis D.,National and Kapodistrian University of Athens | Phelan R.,Eblana Photonics
IEEE Photonics Technology Letters | Year: 2012

An efficient phase preserving amplitude noise limiter suitable for constant envelope phase-modulated signals is experimentally demonstrated for 10-Gb/s differential phase-shift-keying (DPSK) signals exploiting injection locking in Fabry-Pérot lasers. The limiter operates successfully over a 16.4-nm tuning range leading to 12 dB of power penalty reduction for $10 - 3 of bit-error-rate (BER) performance. © 2006 IEEE. Source

Kakande J.,University of Southampton | Slavik R.,University of Southampton | Parmigiani F.,University of Southampton | Bogris A.,Technological Educational Institute of Athens | And 6 more authors.
Nature Photonics | Year: 2011

The exponentially increasing capacity demand in information systems will be met by carefully exploiting the complementary strengths of electronics and optics1,2. Optical signal processing provides simple but powerful pipeline functions that offer high speed, low power, low latency and a route to densely parallel execution3. A number of functions such as modulation and sampling4-7, complex filtering8 and Fourier transformation have already been demonstrated. However, the key functionality of all-optical quantization has still not been addressed effectively. Here, we report an all-optical signal processing architecture that enables, for the first time, multilevel all-optical quantization of phase-encoded optical signals. A four-wave-mixing process is used to generate a comb of phase harmonics of the input signal, and a two-pump parametric process to coherently combine a selected harmonic with the input signal, realizing phase quantization. We experimentally demonstrate operation up to six levels. © 2011 Macmillan Publishers Limited. All rights reserved. Source

Fragkos A.,National and Kapodistrian University of Athens | Bogris A.,Technological Educational Institute of Athens | Bogris A.,National and Kapodistrian University of Athens | Syvridis D.,National and Kapodistrian University of Athens | Phelan R.,Eblana Photonics
Journal of Lightwave Technology | Year: 2012

In this study, a phase-preserving limiter based on injection locking a semiconductor laser is fully investigated as an amplitude limiter for 10 Gb/s constant envelope phase encoded signals. A theoretical analysis on the modulation bandwidth and the modulation transfer function of the injection locked laser is carried out targeting to identify the operational characteristics and the regeneration properties of the proposed amplitude limiter. The theoretical analysis demonstrates the potential of the specific limiter to amplify 25 Gbaud phase modulated signals with simultaneous regeneration of its amplitude properties. Subsequently an experimental investigation demonstrates the performance of the proposed regenerator and addresses its potential exploitation in future optical networks. The specific limiter exhibits significant amplitude noise squeezing capability and extreme implementation simplicity. © 2011 IEEE. Source

Agency: Cordis | Branch: H2020 | Program: SME-1 | Phase: ICT-37-2014-1 | Award Amount: 71.43K | Year: 2014

Video, mobile and cloud have driven network bandwidth to grow at astonishing rates, estimated at about 40% growth year over year. Between 2000 and 2009 channel data rates in commercial optical fibre networks were peaking at 10Gb/s. Introduction of coherent technology caused a step change and around 2011 rates jumped to 100Gb/s for long haul transmission. It was enabled by advances in digital signal processing, narrow linewidth lasers, coherent receivers and optical modulators. Such modulators are used to control both the level and phase of the optical signal to send data and are the main topic of this proposal. State of the art modulators are based on a common optical transmitter circuit (a Mach-Zehnder Modulator) to encode the data. In 2012 researchers at the Univ. Southampton invented a new device and applied for a patent on the concept. It is based on optical injection locking (OIL) and allows directly modulated lasers to be used to encode the data. Demonstration systems were developed in partnership with Eblana Photonics who provided the OIL laser devices and is the exclusive licensee to the patent IP. Eblana, established in Dublin in 2001, provides laser sources for sensing and high volume comms applications. The technique has received strong interest from the scientific community and, significantly, network system manufacturers who have stated eagerness to trial prototypes. Differentiators are that the output is linear, drive electronics are fundamentally simpler and uses half the number of high speed connections compared to the competition. Key advantages include low cost, low power consumption and amenable to miniaturisation to very small sizes. Coherent 100G transmission will migrate to shorter reach and wider usage in metropolitan networks (60-800km range) and in enterprise and access at shorter distances and these are the market focus. Eblana Photonics will exploit this technology to become the highest volume supplier of such modulators in the world.

Agency: Cordis | Branch: FP7 | Program: CP | Phase: ICT-2007.3.5 | Award Amount: 4.02M | Year: 2008

The PHASORS project targets the development and applications of fibre based Phase Sensitive Amplifier (PSA) technology in 40Gbit/s broadband core networks, and seeks to provide Europe with a lead in this important yet relatively unexplored area. PSAs have the potential to be a disruptive technology within future optical communications, enabling ultra-low noise amplifiers and a host of important ultrafast optical processing functions for networks employing high spectral efficiency phase encoded signals.\n \nSpecifically PHASORS will:\n\n(1) Develop a reliable technology base for the realisation of practical, cost effective, PSAs and will advance the state-of-the-art in phase-locked pump systems, narrow linewidth lasers, high power amplifiers and lasers, and high performance nonlinear fibres.\n\n(2) Investigate both interferometric and non-interferometric fibre based approaches to PSA. \n\n(3) Demonstrate a PSA with a record noise figure of less than 1dB.\n\n(4) Demonstrate the benefits of the low noise properties of PSA for transmission applications.\n\n(5)Demonstrate the use of PSAs within two different application spaces:\n\tPhase sensitive optical sampling at data rates of > 40 Gb/s; \n\tOptical regeneration of phase modulated data signals at data rates >40 Gb/s.\n\nPHASORS is therefore fully aligned with the objectives of ICT-2007.3.5: Photonic components and subsystems and directly addresses several of its target outcomes by developing high performance lasers and using them together with optical fibres for high performance within specific applications in phase-sensitive parametric amplification. If successful, the PHASORS technology will have a significant impact in enabling scalable, future-proof and cost effective broadband core networks at 40Gb/s or beyond per channel. The high performance components developed will also have applications in a range of other non telecom applications including sensing, aerospace, metrology and medicine amonst others.

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