Fiberoptic technologies used in high-speed telecommunication systems have changed radically in the last 15 years, driven primarily by the emergence of low-loss single-mode fibers, highly sensitive receivers, high-speed semiconductor laser diodes, and fiber amplifiers. Though impressive transmission capacities have been achieved through these advances, today`s systems use only a fraction of the few terahert¥bandwidth offered by optical fibers, due to the limitations on the operating speed of

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