DC balance of 8B10B optical fiber communication
2017-12-10
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In the high-speed serial data transmission, the transmitted data is encoded into a self synchronous data stream, that is, the data and clock are combined into a single signal for transmission, so that the receiver can easily and accurately separate the data and clock, and to achieve a satisfactory bit error rate, the key technology is the data coding method in the serial transmission. At present, most high-speed serial standards adopt 8B / 10B coding scheme, such as fibre channel 1, PC I - Express, serial ATA, Ethernet, XAU I, in2 fin IB and and serial connected SCS I, etc. Using 8B / 10B coding technology, the following problems are solved. (1) conversion density: ensure enough signal conversion in data stream. Using 8B / 10B coding method, the number of continuous "1" or continuous "0" in the data stream is not more than 5, so that the PLL at the receiving end can work normally and avoid the data loss caused by clock drift or synchronization loss at the receiving end. (2) DC compensation: in high-speed data transmission lines, differential signal is generally used, and the DC component is required to be as small as possible. 8B / 10B has DC compensation function, that is, DC offset will not appear in the link with the passage of time. (3) Error detection: 8B / 10B code adopts redundancy mode, which encodes 8-bit data and some special characters into 10 bit data according to specific rules. According to these rules, error information in the transmission process can be detected.
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