With the image compression technology, it can greatly reduce the signal transmission bandwidth, in order to occupy less resources to transmit the image signal. At the same time, because of the standard interface of N * 2Mbps, the communication of the existing telecommunication transmission equipment can be used to transmit the monitoring images, which brings convenience for engineering applications. However, the image compression digital optical transceiver has its inherent disadvantage. Its fatal weakness is that it can't guarantee the real time of image transmission. Because the image compression and decompression need a certain time, so it will generally be transmitted to the image generated by the 1-2S delay. Therefore, the device is only suitable for use in places with high requirement of real-time. In addition, after the compressed image produced a certain degree of distortion and the optical machine price is on the high side.