Study And Design Of The Remote USB Optical Fiber Transmission System

Universal Serial Bus (USB) is a newly-emerged computer peripheral communication interface standard. With the rapid development of computer and digital technology, and the evolution of USB 2.0 and USB OTG Specifications, the USB technology is becoming more widely used than ever before. USB has the advantage of flexibility, convenience, stability, broad application, and low cost. It has become a standard interface of computer nowadays. However, the transmission distance of USB is restricted to several meters on a single cable, and at most tens of meters even cascaded, which is a main obstacle that confines its application. Therefore it becomes significant to development a remote USB transmission system.This thesis provides a solution that utilizes optical fiber to transparently transmit USB signals. It supports full-speed remote USB transmission by adding a pair of optical transceivers on both sides of local host and remote device, which are linked by a pair of single-mode optical fiber. The hardware designing and software programming are introduced in detail. Circuit scheme for each part of the system, kernel codes in Verilog HDL, and debugging results are provided. Malfunctions and failures during the debugging and running periods are analyzed, and solutions to existing problems are presented. Suggestions to the upcoming work, which will support high-speed USB transmission, are given in the end.