Chaotic signal has drawn much attention in secure communication for its characteristics of wideband

noise-like and long-term unpredictable.In this paper

chaotic optical communication is proposed to solve the secure problem of transmission in power communication network.We first study the traditional chaotic optical encryption scheme experimentally

and then investigate the secure problems of chaotic optical communication in power communication network.The scheme of time delay concealment is proposed to solve the secure problem

while the time delay concealment is experimentally demonstrated.Moreover

the security of chaotic optical communication is analyzed for parameter estimate attack

and the key space is proved to be enlarged significantly by analysis

which proves the difficulty of brute force attack

and ensures the transmission security in power communication network.