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Alignment tolerance measurement using a DFB laser based on degradation of signal-to-noise ratio owing to speckle noise for short distance multimode optical fibre communication

Alignment tolerance measurement using a DFB laser based on degradation of signal-to-noise ratio owing to speckle noise for short distance multimode optical fibre communication

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A method is proposed for measuring the alignment tolerance between multimode fibres including the effect of speckle noise for short distance high speed optical fibre-communications. The alignment tolerance in the step-index-type multimode optical fibre with a core diameter of 80 µm was found to decrease by ~50% compared to that calculated under conditions of uniform excitation with a coupling loss change of 2 dB.

References

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