![](https://d3ilqtpdwi981i.cloudfront.net/R-5nNZ1e3Skh7y-rSl0MIXxv6S4=/425x550/smart/https://bepress-attached-resources.s3.amazonaws.com/uploads/1c/f0/65/1cf065b5-33eb-4779-8efb-6b60100cf487/thumbnail_bdb007c3-f19e-41e4-aeb8-dfd7e1858552.jpg)
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.
- 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
Available at: http://works.bepress.com/jie-huang/87/