The Type axis of the Optical Fiber Biomedical Sensors and Device market classifies products by transduction principle, primarily into Fiber Bragg Grating (FBG) sensors, interferometric sensors, fluorescence‑based sensors, and surface plasmon resonance (SPR) sensors. FBG sensors, leveraging wavelength shift detection, dominate the segment due to their high multiplexing capability and robustness, contributing an estimated 40% of the market value. Interferometric sensors—such as Mach‑Zehnder and Michelson configurations—offer sub‑nanometer resolution, capturing about 25% of sales, especially in high‑precision biomedical imaging. Fluorescence‑based sensors, which convert biochemical interactions into optical signals, hold a 20% share, driven by their sensitivity in molecular diagnostics. SPR sensors, exploiting evanescent wave interactions for label‑free detection, account for the remaining 15%, finding niche adoption in biosensing platforms. This type‑based taxonomy clarifies how each technology’s performance attributes and cost structures shape its contribution to the overall market size.