Abstract
We investigate the effect of a bidirectional erbium-doped fiber amplifier on the reduction of the differential phase noise in long-range distributed acoustic sensing by coherent detection. We succeeded in reducing the differential phase noise at the fiber position after the amplifier over a distance of 100 km by adjusting the gain of the bidirectional amplifier considering the amplified spontaneous emission. This will effectively improve the accuracy of strain measurement over long distances.
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