We propose a convenient method for achieving highly birefringent (HiBi) elliptic microfibers by use of the -laser machining and the flame-brushing techniques. With optimization of fabrication process, a high birefringence of up to is experimentally obtained. Especially, within a polarization Sagnac interferometer acting as a refractive index (RI) sensor, both positive and abnormal negative sensitivity is measured, dependent on the geometrical variables of the HiBi microfiber. The maximum RI sensitivity is around , which is the highest among the microfiber devices as reported, to our knowledge.
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