Abstract
Novel highly birefringent photonic bandgap fibres (PBGFs) are obtainedby filling of a high index material in the air holes of total internalreflection birefringent photonic crystal fibres. Theeffect of the filling high index material on the transmissioncharacteristics has been theoretically investigated. The photonicbandgap has been achieved by using plane-wave method. Moreover,the phase and group modal birefringence have been studied by afull-vector finite-element method. Numerical results show thatvery high group and phase modal birefringence with magnitude of orderof 10−2 and 10−3 has been respectively acquired, which ismuch higher than those of the non-filled fibres. Furthermore, strongcoupling between surface modes and the fundamental modes has been foundin the bandgap of the birefringent PBGFs, whose effect on thebirefringence and confinement loss has also been discussed.
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