The enhancement of secure data transmission through images on optical communication has been demonstrated experimentally and studied. The tolerance to the dispersion of Optical steganography has been improved. In recent years, the rapid growth of optical communication has become very important to secure information transmission between the sender and receiver. Therefore steganography is introduced, which is used to conceal a secret data in an histogram enhanced image through an optical channel. The dispersion effect is deployed in order to improve the security of the stealth data. In this paper, an algorithm called LSB replacement algorithm is used to conceal a large amount of secret data into the pixels of gray scale image. The dispersion effect due to the larger length of the optical channel used is reduced by increasing the PSNR. The extra dispersion at the transmitter and the receiver functions as a key pair for the optical communication. Eavesdropping is completely eliminated by this method. Finally the performance of this proposal in image through anoptical channel will be evaluated based on the parameters such as Mean Square Error (MSE), Peak Signal to Noise Ratio (PSNR).
