In this study, power splitters with different lattice configurations are investigated. First a Y-splitter in a square lattice is presented and compared with its counterpart in hexagonal lattice. Then in order to minimize backward reflections and to obtain equal distribution of power we present heterostructure built on hybrid 2-D photonic crystal (PhC) lattice, this structure is a combination of square and hexagonal lattices. Our numeric simulation with finite-difference time-domain (FDTD) technique shows that the heterostructure has better performances. By this structure we achieve an overall throughput efficiency of 94%. Then by applying theoretical approach (Couple Mode theory) transmission properties of T-junctions are optimized and physical mechanism behind them are explained. Also two optimized 90° bend with high transmission efficiency are proposed At last, based on these optimized T-junctions and 90° bends we propose new 1x4 optical power splitter schemes in PhC with high transmission efficiency and equal splitting ratio over a large bandwidth in third communication window.