Open AccessCoupling in dual-core photonic bandgap fibers: theory and experiment
Author(s) -
Z Wang,
Toshiki Taru,
T.A. Birks,
Jonathan C. Knight,
Y Liu,
Jiangbing Du
Publication year - 2007
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.15.004795
Subject(s) - cladding (metalworking) , photonic crystal , optics , rod , materials science , photonics , maxima , core (optical fiber) , coupling (piping) , refractive index , maxima and minima , band gap , photonic crystal fiber , coupled mode theory , coupling constant , decoupling (probability) , optical fiber , physics , optoelectronics , medicine , art , alternative medicine , pathology , performance art , metallurgy , art history , mathematical analysis , mathematics , particle physics , control engineering , engineering
We have theoretically and experimentally investigated dual-core photonic bandgap fibers (PBGFs), which consist of a cladding with an array of high-index rods and two cores formed by omitting two nearby rods. We find novel features in their coupling characteristics such as maxima and minima in coupling length, complete decoupling of the cores, and an inversion of the usual ordering of supermodes so that the odd supermode has the higher propagation constant. This behavior is understood by considering the field distribution in the rods between the cores.