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Initial mode power distributions in multimode optical fibers: impact on modal noise

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Modal noise is a significant system limitation in laser-based multimode fiber links, especially at long wavelengths. The mode power distribution (MPD), which specifies the amount of power flowing in each mode of a multimode fiber, influences the level of modal noise in these systems. A number of authors have pointed out that the level of modal noise should decrease as the number of fiber modes which are excited Nex increases.1-3 These calculations show that the noise level should be proportional to Nex1/2. Generally, previous work has assumed that power in multimode fibers was distributed uniformly among the fiber modes.2,3

© 1984 Optical Society of America

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