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Next-generation Optical Access Subsystems Print
The application notes listed below are the result of the Joint Experimental Activities performed by the 17 members of EURO-FOS consortium and Network, during the 4 years of the duration of the project. They formulate an extremely useful source of on-hands information and consolidated laboratory know-how to the researchers in the domain of photonics communications.

Contributing Institutions: IT, UPC
Summary: This is an Application Note resulting from the JEA1.2 Mobility Action: Impairment monitoring subsystems in WDM?PON access networks. The objective was to study the characteristics and limitations of a wavelength tuneable OTDR subsystem-prototype fabricated as a cost-effective monitoring solution for PONs. It is based on the addition of reflective components to create reference reflective events in critical points of the network, for application in long reach WDM-PON access networks, without disrupting normal network operation. In this application note the following topics are addressed: 
I. The basics of OTDR monitoring techniques 
II. The application of this cost reduced tuneable OTDR prototype and its implementation in WDM-PON network scenarios.
Contributing Institutions: Tyndall National Institute, UCC
Summary: This application note presents a novel technique using Semiconductor Optical Amplifiers  (SOAs) to create burst optical packets that emulate optical data transmission over  Passive Optical Networks (PONs). High dynamic loud/soft ratio between packets (up to  30dB) and  low inter-packet gaps (<25ns) are some key properties of such burst mode  data arriving at the receiver in the other end of the PON transmission system. Here we  exploit the fast excited state recovery and ns-electrical switching characteristics of SOAs to achieve high dynamic range packets without any measureable impairment. 
Contributing Institutions: Tyndall National Institute, UCC
Summary: Optical system performance is typically characterized by measuring power penalties,  which in the case of a TDMA-PON (Time division multiple access, passive optical  network) requires a burst mode receiver (BMRx). However, a BMRx itself has penalties,  preventing accurate discrimination of penalties from other burst mode components of  the network. This application note demonstrates the technique of using a Semiconductor Optical Amplifier (SOA) based packet equalizer with a conventional  continuous mode Rx as a measurement scheme to evaluate system performance free of  BMRx penalty. Besides offering an interim test solution for PONs until the availability of  a suitable burst mode receiver, the concept of using an SOA as a packet equaliser and at  the same time as a preamplifier to receiver can simplify the future design of the BM-Rx.
Contributing Institutions: Universidad Politécnica de Valencia (UPVLC) and  University of Essex (UoEssex)
Summary: This application note includes the description of error vector magnitude measurements for the performance evaluation of OFDM signals.
Contributing Institutions: Universidad Politécnica de Valencia (UPVLC) and  University of Essex (UoEssex)
Summary: This application note includes the description of error vector magnitude measurements for the performance evaluation of OFDM signals. 
Contributing Institutions: Technische Universiteit Eindhoven (TU/e), Yan Shi, Chigo Okonkwo, and Eduward Tangdiongga
Summary: This application note describes the main issues and challenges which must be considered for the correct configuration of a point-to-point 1-mm core diameter polymethylmetacrylate (PMMA) plastic optical fibre (POF) system. The main sub-systems culminating in a typical end-to-end POF system is discussed. Due to POF attenuation profile, red light at around 650 nm is the most common working wavelength window for POF. POF components are selected regarding the loss, their influence on the system bandwidth and complexity. 
Contributing Institutions: ICCS/NTUA
Summary:  Data remodulation is an elegant way to recycle incoming optical signals and avoids extra seed light sources for remote modulation. Electronic approaches for wavelength reuse in optical broadband access networks are constrained by limited electro-optical bandwidth. All-optical approaches have proven themselves to be reliable and beneficial. The performance of all-optical carrier/clock recovery schemes is reviewed and practical examples are provided. 
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