OptimizedDesigning of Optical Local Area Network WithOptical Code Division MultipleAccess Incorporating Forward Error Correction

摘要

Optical Code-Division Multiple-Access (OCDMA) have flourished as successful schemes for expanding thetransmission capacity as well as enhancing the security for OCDMA. Optical code-division multiple-access is proposed as a natural solution to achievingasynchronous, high-speed connectivity in a local area network environment. OpticalCDMA is shown to be competitive with other networking technologies such asWDMA and TDMA, but has the benefit of more flexibility, simpler protocols, and noneed for centralized network control. The purpose of this paper is toreview the literature on OCDMAoverlay systems, including our approach of onedimensionalcoding of SAC OCDMA. Furthermore, an essential background of OCDMA, recent coding techniquesand security issues are also presented. The limitations of one-dimensional opticalorthogonal codes for CDMA have motivated the idea of spectral spreading in boththe temporal and wavelength domains. If the constraints on constant weight in thesetwo-dimensional codes are relaxed, differentiated levels of service at the physicallayer become possible. Areas for further research are suggested which may allowquality of service levels to be guaranteed at the physical layer.