通过对非线性包层三层平板波导典型实例的理论研究和数值计算,发现存在5种波导结构,当光功率合适时,芯区场能够实现均匀分布,此时包层场分布呈指数衰减.分别给出5种结构的场分布曲线.波导芯区中存在均匀场分布,对于波导、光电子及光子器件具有潜在的应用前景. Through the theoretical research and numerical calculation of typical examples of the nonlinear cladding three-layer slab waveguide, we find that there are five kinds of waveguide structures. When the optical power is suitable, the core field can be uniformly distributed, and the distribution of the cladding field decays exponentially. The field distribution curves of five kinds of structures are given respectively.The distribution of the uniform field in the waveguide core region has potential applications for waveguide, optoelectronics and photonic devices.