单向导通二极管是一种重要的光子器件.在一维光子晶体中非对称位置引入非线性缺陷层实现缺陷模单向导通功能.采用时域有限差分法模拟光脉冲在该光子晶体中传输,发现在通信波段光强较低的脉冲入射时缺陷模双向导通,而光强较大时缺陷模单向导通,其能实现全光单向导通二极管功能. Unidirectional diode is an important photonic device.It introduces non-linear defect layer in asymmetric position in one-dimensional photonic crystal to realize the function of unidirectional conduction of defect mode.The finite-difference time-domain method is used to simulate the optical pulse transmission in the photonic crystal, It is found that the defect mode is bidirectionally turned on when the pulse with lower intensity is in the communication band, and the defect mode is unidirectionally conducted when the light intensity is larger, which can realize the function of the all-optical one-way conduction diode.