1. 16 maggio 20081 Advanced Technologies for Service- Integrated Optical In-Building Networks Serena Caruso Bavisotto

2. 16 maggio 20082 More services and a single network Optical fiber is bringing high capacity to the user's residences in Fiber-to-the-Home networks There is a variety of in-building networks, each optimized to deliver a particular set of services (CATV, telephony, high speed data, control and monitoring signals, etc.) A single converged in-building network would considerably ease the introduction and upgrading of services, as well as the creation of relations between them The signal transparency of optical fiber makes it an ideal medium to realize such converged network

3. 16 maggio 20083 POF-based multiservice in-building network Standard silica fibers need delicate handling and accurate installation Large-core multimode fibers (i.e. Polymer Optical Fiber) is much easier to install, but bandwidth is strongly reduced by multimodal dispersion (especially SI fibers) Multiple services in an in-building network: –Advanced signal processing and multiplexing techniques Multi-standard wireless services in the POF network: –Radio-over-fiber techniques

4. 16 maggio 20084 Outline Mode Group Diversity Multiplexing (MGDM) for service integration Techniques for high-speed data transfer over highly dispersive polymer optical fiber –EVM vs carrier frequency for QAM system Optical Frequency Multiplication (OFM) for dinamically providing high-capacity wireless services over fiber Conclusions

5. 16 maggio 20085 MGDM (1) Several subset of guided modes employed in parallel by selectively exciting them with different signals Indipendent multiplexing of a number of services on a single multimode fiber infrastructure Signal processing at both ends of the link is applied to counteract mode mixing which inherently is incurred in the fiber and it is aided by pilot tone monitoring

6. 16 maggio 20086 MGDM (2) Each laser diode (i.e. VCSEL) excite a subset of modes in the fiber link Each photodiode detect a (differently composed) subset of modes Signal processing similar with MIMO in multiple- antenna wireless communication system Good stability under environmental temperature changes

7. 16 maggio 20087 High-capacity POF links using QAM PMMA POF bandwidth severely limited because of large multimodal dispersion QAM increase the information content per symbol and thus reduce the bandwidth requirements on the fiber link QAM chip sets consist of quadrature modulator/demodulator circuits, as well as a Baseband Processor (BBP) which converts the serial binary input data stream into the multi-level I- and Q-signals

8. 16 maggio 20088 Options for QAM transmission over a POF link Consider two options: direct QAM Wavelength-sliced QAM 0.7R/log 2 N 1.4R/log 2 N

9. 16 maggio 20089 EVM vs carrier frequency for direct QAM system over 100 m SI-POF EVM= Error Vector Magnitude

10. 16 maggio 200810 High-capacity fiber-wireless network Optical routing may improve the flexibility and the efficiency with which the network resources can be used In-building (polymer) optical fiber network provide reconfigurable connectivity between broadband wireless pico- cells confined to rooms HCC: Home Communication Controller

11. 16 maggio 200811 OFM Connections between rooms are established by an optical crossconnect in the central HCC, which switches the analog radio-over-fiber signals transparently between its fiber ports – support multiple wireless standards (WiFi, WiMAX, etc.) Optical Frequency Multiplication (OFM) is very robust against modal dispersion in multimode fibers

12. 16 maggio 200812 Conclusions The wealth of bandwidth offered by fiber in the metro and access network may be effectively unleashed inside buildings by advanced yet low-cost multimode fiber network techniques, enabling to integrate various types of services into a single fiber network infrastructure MGDM allows service integration by deploying several mode groups in parallel Using QAM, high-capacity data services can be transported in highly-dispersive optical fibers, and using the OFM technique also high-capacity wireless services can be delivered through such a fiber Optical routing techniques may be deployed for increasing the flexibility of the network, and for improving the efficiency with which the equipment is used

13. 16 maggio 200813 Bibliography Advanced Technologies for Service-Integrated Optical In-Building Networks Koonen, A.M.J.; Larrode, M.G.; Yang, J.; Urban, P.J.; Yang, H.; Ng'oma, A.; Rijckenberg, G.J.; van den Boom, H.P.A.; Transparent Optical Networks, 2007. ICTON '07. 9th International Conference on Volume 1, 1-5 July 2007 Page(s): 122-127