Progressive Scattering Enhancement is a fiber design approach in which optical backscattering is gradually increased along the length of the fiber, typically by introducing controlled variations in refractive index or dopant concentration. This spatially varying scattering profile compensates for signal attenuation over distance, maintaining more uniform backscatter intensity. It improves the performance of distributed sensing systems by extending sensing range, enhancing signal-to-noise ratio, and enabling more consistent measurement sensitivity along the fiber.
We report a record long 200.6 km distributed acoustic sensing (DAS) link without inline ampli-fication, 28.6% improvement of sensing range has been achieved by using three segments of enhanced-scattering fibre (ESF) with progressively higher scattering enhancements.
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