The depressed-index dual core PCF-based broadband directional coupler is designed by using semivectorial finite
difference method. We study the influence of the structural parameters on the coupling characteristics in the dual core
PCF. The results show that once the structural parameter of the cladding of the dual core PCF and the doping degree in
the dual core region are optimised, the broadband coupling can be realised: in the wavelength range of 1.22~1.65μm, the value of the coupling length is stabilized at 26637nm±235nm and when the couplers are designed as two kinds
of couple with coupling ratio of 50% and 10%, the coupling ratios of (50±0.702)% and (10±0.664)% are realized,
respectively.
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