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 x 10-4 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 stressinduced 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.
L. Yuan et al., "Stress-Induced Birefringence and Fabrication of In-Fiber Polarization Devices by Controlled Femtosecond Laser Irradiations," Optics Express, vol. 24, no. 2, pp. 1062-1071, Optical Society of America, Jan 2016.
The definitive version is available at https://doi.org/10.1364/OE.24.001062
Electrical and Computer Engineering
National Science Foundation (U.S.)
Keywords and Phrases
Birefringence; Diffraction gratings; Fibers; Light polarization; Optical communication; Optical fiber fabrication; Polarization; Single mode fibers; Ultrashort pulses, Fiber-optic sensing; Long period fiber grating; Optical birefringence; Polarization devices; Polarization extinction ratio; Quarter wave-plate; Resonant wavelengths; Stress induced birefringence, Optical fiber communication
International Standard Serial Number (ISSN)
Article - Journal
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