Multiple Optical Orthogonal Code-based Optical Label And Experimental Study

As the next-generation optical network development goal, optical packet switching (OPS) network bear the weight of data services by the form of optical packet. Payload transmission and switching in the optical domain, while the proceesing and controlling of label are completed in the electronic domain. The technology of optical label processing is a key technology and implementation for optical packet switching. In this thesis, the optical label processing based on optical orthogonal code (OOC) are analysed and the controlling circuit and FBG encoder/decoder are designed. The optical processing technology based on triple-OOC are experimented in the optical packet switching system.Non-coherent OCDMA system use optical intensity to carry the information. It is very easy to achievement.The requirement of the device performance is loose. Optical orthogonal code become address code of Non-coherent OCDMA system for its excellent performance. OCDM-based optical packet switching systems use the optical orthogonal codes to encode the label . It can be restored through optical decoder .The payload signal is restrained by the decoder. The quantity of label with a single OOC is limited by the code length and code weight of OOC. So the Multiple Optical Orthogonal Code(MOOC) is put forward to increase the quantity of label largely. The scale of network would be enlarged. The key technologies of MOOC lable are encoding/decoding and identity. Those technologies will be researched in this thesis.The encoding module of MOOC consists of FPGA controling circuit, optical switching, encoder, optical fiber delay line (FDL), light sources and modulator. FPGA controlling circuit and encoder of the system are designed by the required function. The FPGA controling circuit include the optical switching configuration interface module, routing information processing module, eccoding pulse producing module and the RS232 interface. The different delay of OOC encoding on time-domain is carried out by the optical switching configuration different access. The router information is received and processed by the router in formation processing module. Encoding pulse transmitter produce the high speed pulse. The RS232 interface module complete the computer and FPGA communication. Encoder and decoder use Fiber Bragg Grating (FBG) tandem structure, relatively easy to achieve.The experiment consists of single OOC encoding/decoding, triple OOC label encoding/decoding, optical packet signal producing, label receiving ,label recognition and label erasure have been done. Some issues encountered in the experiment have been analysise. And experiment is improved base on the analysise.