Abstract
This paper presents an efficient tree-based hybrid spectral amplitude coding optical code division multiple access (SAC-OCDMA) system that is able to provide high capacity transmission along with fault detection and restoration throughout the passive optical network (PON). Enhanced multidiagonal (EMD) code is adapted to elevate system’s performance, which negates multiple access interference and associated phase induced intensity noise through efficient two-matrix structure. Moreover, system connection availability is enhanced through an efficient protection architecture with tree and star-ring topology at the feeder and distribution level, respectively. The proposed hybrid architecture aims to provide seamless transmission of information at minimum cost. Mathematical model based on Gaussian approximation is developed to analyze performance of the proposed setup, followed by simulation analysis for validation. It is observed that the proposed system supports 64 subscribers, operating at the data rates of 2.5 Gbps and above. Moreover, survivability and cost analysis in comparison with existing schemes show that the proposed tree-based hybrid SAC-OCDMA system provides the required redundancy at minimum cost of infrastructure and operation.
Highlights
Adaptation of passive optical network (PON) requires an efficient multiple access technology that can support maximum number of subscribers at high data rates and extended reach
The time required by optical network units (ONUs) medium access control (MAC) layer for fault detection and switching operation is to be given by Tdg + 2Tcycle + 2Tcycle + 2Tcycle + 2Tcycle + Tswitching
This paper proposes a novel tree-based hybrid spectral amplitude coding (SAC)-optical code division multiple access (OCDMA) system with Enhanced multidiagonal (EMD) code and two-tier protection
Summary
Adaptation of passive optical network (PON) requires an efficient multiple access technology that can support maximum number of subscribers at high data rates and extended reach. Wavelength division multiplexed (WDM) technology is adapted to enhance network capacity in terms of data and the number of subscribers. Among all OCDMA systems for the access domain, spectral amplitude coding (SAC) family has gained significant attention because of the desirable correlation properties, flexibility of implementation, and support for high transmission capacity [5]. An optimal SAC-OCDMA coding scheme is one that provides desirable BER, ≤10−9, by reducing multiaccess interference (MAI) and associated phase induced intensity noise (PIIN) through suitable correlation properties, minimum length, large weights, flexibility of implementation, and reduced hardware complexity. Several coding algorithms have been designed in SAC family to provide high capacity along with extended reach; Security and Communication Networks
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