All-fiber multimode-interferende-based refractometer sensor: design and characterization / Nooraini Yusoff

All-fiber refractometer sensor is based on multimode interference in the multimode fiber core section sandwiched between the two single-mode fibers. An eigenmode expansion method in the cylindrical coordinate is employed as the modeling tool for simulation and design of the refractometer sensor. From the design, the characterization of the refractometer can be identifying by change the length of MMF core with varying refractive indices. The refractomer design shows that it would have an estimated resolution of 5.4*10"5 for refractive indices from 1.38 to 1.45 through the choice of an appropriate length of the multimode fiber core section with 1550 nm of wavelength.