Stress-induced birefringence and fabrication of in-fiber polarization devices by controlled femtosecond laser irradiations

Optics Express
Lei YuanHai Xiao

Abstract

Optical birefringence was created in a single-mode fiber by introducing a series of symmetric cuboid stress rods on both sides of the fiber core along the fiber axis using a femtosecond laser. The stress-induced birefringence was estimated to be 2.4 × 10<sup>-4</sup> at the wavelength of 1550 nm. By adding the desired numbers of stressed rods, an in-fiber quarter waveplate was fabricated with a insertion loss of 0.19 dB. The stress-induced birefringence was further explored to fabricate in-fiber polarizers based on the polarization-dependent long-period fiber grating (LPFG) structure. A polarization extinction ratio of more than 20 dB was observed at the resonant wavelength of 1523.9 nm. The in-fiber polarization devices may be useful in optical communications and fiber optic sensing applications.

References

Aug 6, 2009·Optics Express·Haifeng XuanYanbiao Liao
Apr 1, 1987·Optics Letters·R B DyottV A Handerek
Feb 18, 2010·Optics Letters·Felipe Beltrán-MejíaCristiano M B Cordeiro
Nov 29, 2012·Optics Express·Luís A FernandesPaulo V S Marques
Mar 5, 2013·Optics Letters·Karima ChahChristophe Caucheteur

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