High Datarate in Multimode Fiber Using Vector Intensity Modulation

Abstract: Multimode fibers(MMFs) are generally used for transmission of light signals over optical fiber for small distance. Here multimode fibers are used for long haul transmission using vector intensity modulation. By using this method we can obtain higher datarates over multimode fibers.The use of channel feedback preserves the full multiplexing gain and avoid the losses of datarates. This is preffered because the ultimate aim is to improve the robustness of links as well as to increase data rates. Precoding is used for pre processing the signals so that the effective transmission modes can be identified. The vector intensity modulation technique with multiple sources and detectors and post processing minimizes the modal dispersion. The compensation methods improve the bandwidth and the wavelength product of MMFs. By using the above methods a 50% increase over the single laser and detector is obtained.

Keywords: MMFs, precoding, post processing, OFDM.