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Abstract
Splicing is an essential technique for optical microfibers. In this letter, we report on low-loss splicing of evanescent-wave-coupled microfibers by coating them with a low-index polymer named high-substituted hydroxypropyl cellulose (H-HPC). The polymer coating can significantly increase the overlap of mode fields and effectively enhance the coupling strength. As a result, the transmission ratio can reach 94% over a wavelength range of 100 nm by controlling the coating thickness and length. H-HPC coating also enables a high mechanical strength at the joint segment. The coated microfibers can stand a pulling force up to 1 N. Compared with existing techniques, the present splicing method offers a great operation convenience and easiness.
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