提出了在完整三角晶格光子晶体中引入两线缺陷构成的耦合型波导结构。通过分析谱带形对不同结构参数的依赖关系，在最优化的光子晶体耦合波导中，找到了一种独特的、群速近似为零的谱带。通过对波导宽度的啁啾实现了不同频率光的色散补偿，最终得到了带宽为13.24 nm、平均群折射率为28的宽带理想慢光，并进一步采用二维时域有限差分(FDTD)算法进行了验证。数值分析结果表明，高斯脉冲在耦合波导中传输后的相对时域展宽低于10%。

A photonic-crystal coupled waveguide is proposed by introducing two line-defects to perfect triangular lattice. By analyzing the dependence of band shape on various structure parameteral, unique band with approximate zero group velocity can be obtained in an optimized photonic-crystal coupled waveguide. Moreover, by chirping the widths of the photonic-crystal waveguides in the optimized structure, a perfect wideband slow light is obtained, it possesses the bandwidth of 13.24 nm and the average group index of 28, which is verified by means of two-dimensional finite-difference time-domain (FDTD) simulations, and our numerical analysis shows that Gaussian pulses passing through the coupled waveguide have a relative temporal spreading below 10%.