A Novel Design Of Bidirectional Fiber Optic Rotary Connection System With High Signal Transmission Rate

Signals and energy often need to be transmitted from stationary platform to rotary platform in many fields, e.g. radar system, navigation system and naval vessels, etc. In the past, signal between stationary platform and rotary platform transmitted by electronic slip ring in order to realize remote control. As transmission capacity and band width of signal are increasing, performance of electronic slip ring could not meet the requirement of applied system. A kind of fiber optic rotary transmission technology, which is based on optic fiber signal transmission, is proposed and replace electronic slip ring. Researchers more and more focus on this kind of technology because of its properties of optic signal transmission, e.g. high transmission capacity, broad band-width, electromagnetic compatibility, low insertion loss, etc.In this paper, a kind of fiber optic rotary connection system with high signal transmission rate is presented and realized, which is based on fiber optic rotary connection and composed of optic-electronic transceiver modular, line code modular and bi-directional channel of fiber optic rotary. The results of measurement and analysis indicates that system possess maximum transmission rate of 2.5Gbps, low variation of insertion loss and total insertion loss, excellent EMC, etc. The method of bi-directional transmission is designed by using optic calculator, isolation degree, insertion loss and reliability of system by this way are better than other methods.A new type of fiber optic rotary joint is also proposed in the paper. Low loss connection of fiber optic rotary is realized by direct coupling of fiber, which is photon crystal fiber (PCF). The results of analysis of coupling theory indicates that the method of direct coupling of PCF decrease obviously accuracy of machining and assembly. The PCF joint posses low insertion loss of 0.5dB. It could be manufactured depend on the machining condition in domestic. The PCF joint could effectively suppress non-linear effect of S₁O₂ fiber. Therefore...