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We present an all-fiber Mach–Zehnder modal interferometer based on a special photonic crystal fiber taper and its performance as a transducer for biological sensing. The sensor showed refractive index sensitivity around 722.3 nm/RIU for measurements between 1.30864 and 1.32014 RIU We investigated the interferometer as a transducer for an immunosensor system after immobilization of an antigen over...