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22 I ICT TODAY transparent to wavelength and can operate in the O-band (1300 nm window) or C-band (1500 nm window) range with standard singlemode transceivers at 1 Gb/s, 10 Gb/s or even higher. Intrinsic loss of such a modal adapter is less than 2 dB and does not add transmission power penalty. Considering the linear losses of optical fibers at these high wavelengths and the sensitivity of single- mode standard transceivers, the overall optical budget of the link remains sufficient to transmit information over long distances and to cover the requirements for all types of LANs that need their legacy multimode fiber cabling infrastructure upgraded. CASE STUDY: UPGRADING THE CONNECTIVITY OF FRATERNITY HOUSES AT GEORGIA TECH The Georgia Institute of Technology, also known as Georgia Tech, is a public research university located in Atlanta, Georgia. This university strives to provide high- speed connection to fraternity houses on campus in order to provide students with high quality services, such as robust Wi-Fi coverage with increased wireless access points (WAPs); high quality wired internet access in the face of increased data traffic in the era of bring complete light shaping with very little loss through a succession of transverse phase profiles similar to very complex optical lenses. The technology shapes a laser beam (light from a transceiver) in such a way that each mode within the multimode optical fiber can be inde- pendently and precisely excited. Today, MPLC technology is used to increase the transmission capacity and to achieve bandwidth gains of existing multimode fibers by performing perfect center launching on legacy multimode fibers (Figure 4). By overcoming speed and distance limita- tions, up to 100 Gb/s can be carried over an existing multi- mode infrastructure up to several kilometers. There are solutions adapted to different topologies that allow for a progressive and flexible evolution of the legacy network optical infrastructure, compatible with any 62.5/125 μm or 50/125 μm multimode fiber types (i.e., OM1 to OM5). Because this technology consists solely of optical elements, the solutions are passive (e.g., no energy consumption, no supervision) and operate at the physical layer level, which makes them transparent to the commu- nication protocol and modulation format used. There is no need for EDC or complex digital processing at the reception of the transmission; simple detection systems, such as direct detection, are sufficient. This technique is MPLC enables flexible and complete light shaping with very little loss through a succession of transverse phase profiles similar to very complex optical lenses. Exposed cables easily disrupted Temporary new projector distance too great for passive HDMI cable FIGURE 4: Multimode Fiber (MMF) bandwidth gain comparison between perfect center launching (MPLC) and offset launching. Theoretical MMF bandwidth gain according to launching conditions (extract from IEEE 802.3aq study) Perfect center launching (Multi-Plane Light Conversion) Offset launching (Mode conditioning patchcord + Electronic Dispersion Compensation) Light launching conditions 0 MMF Bandwidth gain