Title :
Polarization-Insensitive Tunable LPFGs Using Magnet-Induced Microbend Under Torsional Stress
Author :
Sakata, Hajime ; Wakamiya, Kouji ; Sasaki, Satoshi
Author_Institution :
Dept. of Electr. & Electron. Eng., Shizuoka Univ., Hamamatsu, Japan
Abstract :
Polarization-insensitive operation in magnet-induced long-period fiber gratings is presented by circulating the polarization axis in the fiber under a coil spring. The polarization-dependent loss is reduced <;0.4 dB around the resonance wavelength. The loss amplitude is controlled up to 20 dB by positioning a Nd-Fe-B magnet under the fiber. The band-rejection filter response does not deteriorate during the loss-tunable operation in torsion fibers.
Keywords :
band-stop filters; boron alloys; diffraction gratings; iron alloys; neodymium alloys; optical fibre filters; optical fibre losses; optical fibre polarisation; torsion; NdFeB; band-rejection filter response; coil spring; loss amplitude; loss-tunable operation; magnet-induced long-period fiber gratings; magnet-induced microbend; polarization axis; polarization-dependent loss; polarization-insensitive operation; polarization-insensitive tunable LPFG; resonance wavelength; torsion fibers; torsional stress; Magnetic resonance; Magnetic separation; Magnetomechanical effects; Optical fiber devices; Optical fiber dispersion; Optical fiber polarization; Springs; Permanent magnet; long-period fiber gratings; microbending; polarization-insensitive;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2014.2309701
