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Fabrication of micro-ridge long-period gratings inscribed on polarization-maintaining fibers

Oh-Jang Kwon, Myungjun Shin and Young-Guen Han*

Author Affiliations

Department of Physics, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791, South Korea

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Nanoscale Research Letters 2014, 9:39  doi:10.1186/1556-276X-9-39

Published: 20 January 2014


We experimentally investigated a simple and new technique for the fabrication of micro-ridge long-period gratings (MRLPGs) based on polarization-maintaining fibers (PMFs). The cladding region of the PMFs was etched periodically using a wet etching technique resulting in the periodic formation of micro-ridges on the surface of the PMF. The PMF-based MRLPGs has two resonant peaks because of the birefringence of the PMF. The extinction ratios of two resonant peaks of the PMF-based MRLPGs were effectively improved by increasing the applied strain because of the photoelastic effect.

Long-period fiber gratings; Strain sensor; Polarization-maintaining fiber