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A butt-coupled low dispersion slow light photonic crystal waveguide has been proposed in this paper. It is comprised of
two types of photonic crystal waveguides which have opposite dispersion curve. These two types of photonic crystal
waveguides have been solely adjusted the radius of air-holes rather than change its position. Based upon our analysis, the
average group index achieves 35 with Δ λ=6nm and this scope can be enlarged by fine adjustment. Finite-different timedomain
method has been adopted to execute the simulation and the result demonstrates that the pulse has been modified
when it propagates in this butt-coupled photonic crystal waveguide.