Highly polarization-dependent periodic coupling in mechanically induced long period grating over air-silica fibers.
A very flexible and versatile tunable mechanical grating platform is introduced, with which highly polarization-dependent mode coupling is observed for three types of air-silica microstructured fibers: hollow core fiber, hexagonal-boundary holey fiber (HHF), and circular-boundary holey fiber. The resonances of gratings showed highly polarization-dependent broadband coupling compared with conventional single-mode fibers due to their unique beat-length dispersions between the core and the cladding modes, which could find applications in wideband polarization-dependent loss compensation. We further present significance of the spatial symmetry of HHF in distinct mode coupling for different rotation angles around the fiber axis.
Department of Information and Communications, Gwangju Institute of Science and Technology, South Korea.
D
D
Lee
Y
Y
Jung
Y S
YS
Jeong
K
K
Oh
J
J
Kobelke
K
K
Schuster
J
J
Kirchhof