Photonic crystals with linear defects can be used for designing photonic micro devices with light control propagation in such structures. In this case special attention is given to schemes, providing active management of a propagating light. Two dimensional photonic crystals were used to provide in-plane confinement for in-plane propagation. As an example, planar waveguides [1, 2] have been used to efficiently guide electromagnetic waves through a line defect in a PhC. To this end, a single line defect introduced to a photonic crystal resembled a waveguide, for which careful design of waveguide parameters such as width and thickness, number of propagating modes can be controlled [3]. Defects can be introduced in PhCs by locally breaking the translational symmetry. They create states inside the PBG that are spatially localized in the defect regions. This fact has important applications for integrated-optical devices, in reducing their size and increasing the packaging density. A line defect can represent a waveguide that transfers light around sharp corners with high efficiency Here we report experimental results and numerical simulation of properties of two-dimensional semiconductor photonic crystals, as well as passive photonic crystal devices (waveguides) on their basis. Numerical simulation was conducted with the assistance of a software package CST Microwave Studio. Using the method of numerical modeling the optical properties of structures (reflection and transmission spectra) depends on the structures parameters were investigated. Distribution of the electromagnetic field in the structures of photonic crystal - waveguide, depends on the structure parameters and wavelength. Following the simulations, photonic crystals and waveguide structures was made using focused ion beam etching (see Fig.1). Experimental study of parameters of transmission of electromagnetic radiation 1550 nm through the FC and structure were performed. Investigated structures may find application in photonics devices, as well as elements of optical integrated circuits.figureFig.1. Image of photonic crystal – waveguide structure made by ion beam microscopy.