15-09-2017, 01:34 PM
Optical code division multiple access (OCDMA) combines the high bandwidth of the fiber medium with the flexibility of the CDMA technique to achieve high speed connectivity. OCDMA has the potential to support both asynchronous and explosive communications. The establishment of OCDMA needs to overcome the cardinality problem of 1-D codes. In order to increase the number of users, unipolar codes with greater capacity must be designed. In this paper we have analyzed the performance of an incoherent OCDMA scheme based on the wavelength / time codes.
TDMA, WDMA and CDMA are available the main multiple access techniques. Both the TDMA system and the WDMA system require a time or frequency management system, however the CDMA system does not require any centralized control and therefore reduces the complexity of the system. The Code Division Multiple Access (CDMA) technique allows multiple users to access the network simultaneously and asynchronously by assigning a specific code to each user. CDMA systems offer simplified network control and high bandwidth efficiency at low cost. The successful achievements and widespread applications of the CDMA in the wireless area have renewed interest in investigating its application in optical communication systems. CDMA (OCDMA) has long been the subject of research because of its inherent ability to support asynchronous burst communications. Initially OCDMA was used for the local area, then for access network applications and currently for emerging optical networks such as multi-protocol, FTTH or FTTC (fiber-to-the-curb).
TDMA, WDMA and CDMA are available the main multiple access techniques. Both the TDMA system and the WDMA system require a time or frequency management system, however the CDMA system does not require any centralized control and therefore reduces the complexity of the system. The Code Division Multiple Access (CDMA) technique allows multiple users to access the network simultaneously and asynchronously by assigning a specific code to each user. CDMA systems offer simplified network control and high bandwidth efficiency at low cost. The successful achievements and widespread applications of the CDMA in the wireless area have renewed interest in investigating its application in optical communication systems. CDMA (OCDMA) has long been the subject of research because of its inherent ability to support asynchronous burst communications. Initially OCDMA was used for the local area, then for access network applications and currently for emerging optical networks such as multi-protocol, FTTH or FTTC (fiber-to-the-curb).