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A memoryless interference network model is introduced that is based onnon-linear phenomena observed when transmitting information over optical fiberusing wavelength division multiplexing. The main characteristic of the model isthat amplitude variations on one carrier wave are converted to phase variationson another carrier wave, i.e., the carriers interfere with each other throughamplitude-to-phase conversion. For the case of two carriers, a new techniquecalled interference focusing is proposed where each carrier achieves thecapacity pre-log 1, thereby doubling the pre-log of 1/2 achieved by usingconventional methods. The technique requires neither channel time variationsnor global channel state information. Generalizations to more than two carriersare outlined.

Interference Focusing for Mitigating Cross-Phase Modulation in a Simplified Optical Fiber Model