Two-dimensional (2D) diffractive gratings offer a polarization-independent coupling solution between optical fibers and photonic integrated circuits, with advantages including placement flexibility, ease of fabrication, and tolerance to alignment errors. This technology relies on periodic structures within optical fibers that modify the propagation of light, enabling a myriad of applications ranging from telecommunications to environmental. 📦 For purchasing, use the RP Photonics Buyer's Guide for fiber Bragg gratings. It provides an expert-curated supplier directory, buyer-focused technical background information, and structured selection criteria to support professional procurement decisions. What is a Fiber Bragg Grating? What is a. A fiber Bragg grating (FBG) is a periodic structure inscribed in the core of an optical fiber, where the refractive index varies along its length, transitioning between higher and lower values. In this work, we proposed and experimentally.