All optical fiber polarization controlling devices fabricated by femtosecond laser irradiation

Lei Yuan; Baokai Cheng; Jie Liu; Jie Huang; Hai Xiao

doi:10.1117/12.2211744

9 March 2016 All optical fiber polarization controlling devices fabricated by femtosecond laser irradiation

Lei Yuan, Baokai Cheng, Jie Liu, Jie Huang, Hai Xiao

Proceedings Volume 9740, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XVI; 97400M (2016) https://doi.org/10.1117/12.2211744
Event: SPIE LASE, 2016, San Francisco, California, United States

Abstract

This paper reports the stress-induced birefringence generated in an optical fiber using femtosecond laser (fs) irradiations and the fabrication of in-fiber waveplates and polarizers. 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 and along the fiber axis using a femtosecond laser. The stress-induced birefringence was estimated to be 2.4×10^-4 at the optical wavelength of 1550 nm. By controlling the length of the stress rods, waveplates of the desired retardance can be fabricated. The stress-induced birefringence was further explored to fabricate in-fiber polarizers based on the polarization-dependent long-period fiber grating (LPFG) structure. For the in-fiber polarizer based on low order mode LPFG, a polarization extinction ratio of more than 25 dB was observed at the wavelength of 1527.8 nm. A high order mode LPFG based in-fiber polarizer, with a broad bandwidth of 100 nm near 1550 nm, was investigated as well. The in-fiber polarization devices with low insertion loss may be useful in optical communications and fiber optic sensing applications.

Citation Download Citation

Lei Yuan, Baokai Cheng, Jie Liu, Jie Huang, and Hai Xiao "All optical fiber polarization controlling devices fabricated by femtosecond laser irradiation", Proc. SPIE 9740, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XVI, 97400M (9 March 2016); https://doi.org/10.1117/12.2211744

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