Vernier-effect-based fiber microcoupler for highly sensitive liquid refractive index sensing
Hanchao Sun,
Jixuan Wu,
Binbin Song
et al.
Abstract:An orthogonal mode interferometer (OMI) is proposed and experimentally demonstrated for liquid refractive index sensing using the optical Vernier effect. The OMIs are based on weakly fiber microcouplers, which are fabricated by fusing single mode fiber and coreless fiber together. Owing to the birefringent characteristic of the hybrid coupler, the optical Vernier effect is dependent on the overlap of mode interference between the x and y polarizations. Compared to the response of the individual resonance dip, … Show more
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