Resonant directional coupling of hollow Bragg fibers.
Coupling between the lowest-loss TE01 modes of two touching hollow-core Bragg fibers is considered with a view to designing a directional coupler. We have found that for fibers with core radii larger than 10 microm one can identify broad frequency ranges in which intermodal coupling strength exceeds supermode radiation losses by an order of magnitude, thus opening the possibility of building a directional coupler. We attribute such unusually strong intermode coupling both to the resonant effects in the intermirror cavity and a proximity interaction between the leaky modes localized in the mirror.
Skorobogatiy
Maksim
M
Ecole Polytechnique de Montreal, Genie Physique, C.P. 6079, succ. Centre-Ville Montreal, Quebec H3C 3A7, Canada. maksim.skorobogatiy@polymtl.ca
Saitoh
Kunimasa
K
Koshiba
Masanori
M