Applications of Prime Codes on Optical Networks

• Main Authors: Rong-Hou Wu, 吳榮厚
• Other Authors: Fun Yu
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/92077326702247390944

博士 === 淡江大學 === 電機工程學系 === 91 === The modified prime code has been widely adopted in the optical code-division multiple access (CDMA) system. Although the capacity of synchronous CDMA is P2, P is a prime number, it is limited for the fiber optical communication networks. In this dissertation, we propose a novel structure, namely the Different Prime Codes System Division Multiple Access (DCSDMA) to increase the system capacity by combining various modified prime code sequences in the system access. An optimal design method is proposed which has the capability to provide the simultaneous system capacity from X% * P72 to X% * P72 + Y% * 5 * P32, where P7 and P3 are prime number 7 and 3, respectively. X% and Y% are the successful rate determined from simulation results. Four multiplexing techniques: vertical sequence model (VSM), parallel sequence model (PSM), random permutation model (RPM), and optimal insertion model (OIM) are proposed to implement the multiplexing operation. Consequently a smart optical multiplexer (SOM) is designed. An optical encoder structure combines several modified prime code sequences is proposed. An algorithm is then developed to determine optimally the scheme of combining prime codes. An optical switch photonic code division switch (PCDS) by using the proposed modified prime code in the implementation of switching operation in the system is proposed. Following the transmission route of selecting a prime code it forms a three-layer network architecture. The detailed components of a PCDS, the way of data routing, the optimal connection method, and modularized design are explained in detail. Moreover, a PCDS using variable decoder and encoder to replace the regular demultiplexer and multiplexer during transmitting process can simplify the structure of the network and consequently reduces the cost of network. This network code switching arrangement provides one to one, one to multiple and broadcast transmission characteristics.