Characterization of structural irregularities in highly birefringent photonic crystal fiber using torsional acoustic polarization coupling

Hong, Kee Suk, Lee, Kwang Jo, Yeom, Dong-IL and Kim, Byoung Yoon (2010) Characterization of structural irregularities in highly birefringent photonic crystal fiber using torsional acoustic polarization coupling. Optics Communications, 283 (20), 4094-4098. (doi:10.1016/j.optcom.2010.05.072).

Abstract

We demonstrate a novel method to characterize structural irregularities in a highly birefringent photonic crystal fiber (HB PCF) with high accuracy based on polarization coupling by torsional acoustic wave. Birefringence variation induced by the irregularities of air-hole structure in the fiber cross-section is analyzed via the transmission spectra of the acousto-optic coupling between two orthogonal polarization modes propagating along the fiber. The estimated maximum birefringence variation of two sections in the same batch of the HB PCF is 3 x 10^-6 and 10^-5, respectively, from nominal birefringence value of 4.86 x 10^-4). The comparison between the experimental results and the numerical simulation resulted in the estimation of few tens of nm variation in the air-hole structure in the PCF.

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