Ultra-High-Capacity Optical Communications and Networking: Towards 100 Tb/s Communication on a Single Optical Fiber

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We propose to develop technologies which will enable communication on a singleoptical fiber at rates in excess of 100 Tb/s within a few years. To accomplish this in thelow-loss window of silica fibers (1200-1700 nm), there will be a need for novel verywideband devices, particularly optical amplifiers. In addition, modulation techniques withspectral efficiencies well in excess of unity will be needed. Our research activities will becentered in these two areas. We will investigate modulation techniques, and associated detection schemes,suitable to obtain a spectral efficiency of 4 b/s/Hz by the end of the project. Thetechniques will be designed to be resistant to impairments due to PMD and fibernonlinearities. In particular, we will investigate novel techniques using appropriatecombinations of PSK, QAM, and polarization-based techniques. Coherent detection willbe utilized where indicated to boost spectral efficiency.We will investigate fiber optical parametric amplifiers (OPAs) and discreteRaman amplifiers made from novel highly-nonlinear fibers. These fibers will havenonlinearity coefficients exceeding those of today's most nonlinear fibers by severalorders of magnitude. These fibers will enable the development of novel nonlinearamplifiers , with gain bandwidth of a single device covering most of the 1200-1700 nmwindow. These devices will also use shorter fibers and lower pump powers than theircurrent versions, and may thus lead to practical applications in a relatively short time.