Research Of Optical Fiber Bus Systems And Burst-Mode Optical Transceiver Design & Test

With the rapid improvement of optical fiber communication technology, the information life of people has been realized and the communication is becoming more and more convenient and fast. The advantages of optical fiber communication, such as huge capacity, high speed, low cost, and high quality of service, are obvious. In order to bring these advantages into other application areas, for instance, local area network in airplane, ship and car control systems, an optical bus system based on Mil-Std-1553 is proposed in this paper. The predominant performance of data bus control system can be realized well by the combination of optical fiber communication and Mil-Std-1553 protocol, which has high security, quick response and good controllability.This paper discusses the communication process in the 1553 bus. All the communications are implemented under the control of BC (Bus Control). High efficiency and quick response is guaranteed by the time division command/response mechanism. The general communication between BC and RT (Remote Terminal) or RT and RT can be started by the simple send/receive command from BC. Some other control functions, including the RTs resetting, dynamic bus controlling, synchronizing and enabling/disabling the transmitter, etc., can be implemented by using the mode command and broadcast command. Then, the cooperation between all nodes in the miniature bus LAN's control system is accomplished.After analyzing the working process of optical bus system based on Mil-Std-1553 and defining the relationship between message slots on the bus, a burst-mode optical transceiver module suitable for the optical bus is designed considering the special request about the delay of transmitting and receiving. In transmitter section, a laser driver with digital APC (Automatic Power Control) loop is provided to drive the DFB laser diode, maintain the output optical power high and spectrum narrow. In the receiver section, trans-impedance amplifier and limiting amplifier with reset function are used to amplify the electronic signal from APD photodiode, provide differential output. Consequently, the short enabling/disabling delay and receiving delay can be achieved. The test of the transmitting delay such as receiving delay, output optical power, extinction ratio, receiving sensitive is implemented to validate the design can guarantee the message interval short than 400ns, which meet the request of the optical fiber bus system based on Mil-Std-1553.