Md Ashadi Md JohariAminah AhmadMohd HafizJaliHaziezol Helmi Mohd YusofMohamad Haniff HarunFarina Saffa Mohd SamsamnunMuhammad Imran Mustafa Abdul KhudusSulaiman Wadi Harun2026-10-162026-10-162025-0810.1002/mop.70373https://dspace-cris.utar.edu.my/handle/123456789/11769This experimental paper explored the potential of the microbottle resonator (MBR) as a sensor with different structures and conditions. The silica fiber SMF-28 is used to form the bottle structure by a method known as “soften-and-compress.” Three different MBR structures with similar length (Formula presented.), stem diameter of (Formula presented.), and bottle diameter of (Formula presented.) are formed, classed as single, cascade and cascade coating MBR. The cascade coating MBR was used to apply polyvinyl alcohol (PVA) for the coating procedure. The transmitted power was observed in all MBR conditions, where the structure and coating may influence the resonator to have a low power value, ? 20 dBm. The performance of the MBRs as sensors is then represented by four parameters: sensitivity, linearity, stability, and repeatability from wavelength shift and transmitted spectral evaluation. Even though the cascade-coating MBR showed the lowest power value, it may influence to have remarkable performance through an evaluated parameter. © 2025 Wiley Periodicals LLC.en-USoptical fiber sensoroptical microbottle resonator sensoroptical microfiber resonatorCoatingsData communication equipmentFiber optic sensorsOptical fibersResonatorsSilicaConditionFiber SensorLow PowerMicro-fiberOptical microbottle resonator sensorOptical microfiber resonatorOptical-Resonator sensorsBottlesjournal-article