IdealPhotonics' fiber-to-fiber coupler (adjustable optical path) is a coupling device that dynamically controls the fiber spacing and angle through a precision mechanical adjustment mechanism (such as a translation stage/rotation module). It supports continuous loss adjustment (0-20dB) within a millimeter-level travel range (resolution ≤1μm), making it suitable for optical device testing, sensor calibration, and adaptive optical path systems."Millimeter-level precision travel control + online loss optimization" utilizes a high-resolution mechanical module (0.5μm steps) to adjust the fiber axial spacing and lateral offset in real time, achieving a highly flexible optical path system with dynamically adjustable coupling ratio (0-100% continuously adjustable) and insertion loss <1dB. This provides a crucial debugging method for optical device aging testing and multi-channel sensor calibration.'