Synchronous cascade using random number modulation in Phi-OTDR systems
Optics & Laser Technology（2023）
Abstract
•Random coding method can bring SNR enhancement without loss of the sensing bandwidth.•The coding gain and system SNR can be further optimized by using SCM modulation.•The sensing distance can be further extended to 62.440 km with a 4.4 m spatial resolution.
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Key words
random number modulation,synchronous cascade,phi-otdr
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