Optical fiber displacement sensors have evolved from laboratory interferometers into a multi-vertical industrial technology — now converging with AI, IoT, and distributed sensing architectures capable of centimetre-scale spatial resolution. This perspective article delves into the current performance limitations of distributed optical fiber sensors and proposes avenues for future advancements, as envisioned by the author, whose four-decade-long career has been dedicated to this transformative field. TL;DR: In this paper, a review of the advanced fiber optic displacement sensing techniques that have been developed in the past two decades is presented, including the working principle, sensor design, and performance measures of fiber Bragg grating (FBG)-based, interferometers-based, microwave. Product Type Outlook (Revenue, USD Million, 2024 – 2034) ( Fiber Bragg Grating Sensors, Interferometric Sensors, Capacitive Sensors, Others), Application Outlook (Revenue, USD Million, 2024 – 2034) ( Automotive, Aerospace, Healthcare, Manufacturing, Others), End-Use Outlook (Revenue, USD Million.
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