DW-ZCC code based on SAC–OCDMA deploying multi-wavelength laser source for wireless optical networks

Abstract

In this paper, double weight zero cross correlation (DW-ZCC) code is proposed for spectral amplitude coding optical code division multiple access (SAC-OCDMA) system. DW-ZCC takes the advantages of two previously proposed SAC-codes namely modified double weight (MDW) and zero-cross correlation (ZCC) codes, while providing optimized code length and maximum cross-correlation of zero. Although the proposed code can be utilized in SAC-OCDMA system with any optical medium, this research work focuses on outdoor wireless optical networks (WON) deploying multi-wavelength laser (MWL) source, where optical bandwidth is much limited. The mathematical and simulation analysis of proposed system employing direct decoding (DD) is developed, considering the influences of turbulence and system noises including relative intensity noise, optical beat interference (OBI) and receiver noises. It is shown that employing DD detection; it is possible to completely avoid OBI which enhances system capability. The results show that SAC-OCDMA-WON system is noticeably improved using DW-ZCC in term of transmission distance by at least 200 m in comparison with MDW and conventional ZCC codes.

Integrating Ultra-Wideband and Free Space Optical Communication for Realizing a Secure and High Throughput Body Area Network Architecture Based on Optical Code Division Multiple Access

“…where T , K B , and R L represents the temperature, Boltzmann constant, and load resistance, respectively. The total variance of the noise power becomes [10]:…”

Integrating ultra-wideband and free space optical communication for realizing a secure and high-throughput body area network architecture based on optical code division multiple access

“…SAC-OCDMA technique is adapted to provide robust transmission and mitigation of the various adverse effects between the transmitter and receiver modules. Working principle of SAC-OCDMA system encompasses the translation of binary 1s or 0s into spectral domain by allowing or blocking desired bits through special arrangement of filters in the encoder module [10,11]. This generates multiple carriers to communicate the user information with relatively high spectral efficiency and built-in security [10].…”

“…Working principle of SAC-OCDMA system encompasses the translation of binary 1s or 0s into spectral domain by allowing or blocking desired bits through special arrangement of filters in the encoder module [10,11]. This generates multiple carriers to communicate the user information with relatively high spectral efficiency and built-in security [10]. The family of spectral amplitude codes primarily includes two types of codes namely (i) zero-cross correlation (ZCC) and (ii) fixed in-phase cross correlation codes [11,12].…”

“…The family of spectral amplitude codes primarily includes two types of codes namely (i) zero-cross correlation (ZCC) and (ii) fixed in-phase cross correlation codes [11,12]. Both are developed to mitigate the effects of multiple access interference (MAI) along with the associated phase induced intensity noise (PIIN) for non-coherent sources and optical beat interference for coherent sources at the receiving photo-detector through an efficient combination of code length, weight and cross-correlation [11,10]. The prior offers efficient performance for low cardinality systems by completely removing the effects of MAI with relatively simple architecture at the encoder and decoder modules.…”

Nonlinear Effect and MAI Impact on SAC-OCDMA System Based on 2D Multi-Diagonal Code and Laser Array

“…For instance, LED is used mainly in fiber to the home (FTTH) and Local Area Network (LAN) [14], whereas laser source is employed in long-haul applications such as Metropolitan Area Network (MAN) [18]. In the state-of-the-art, many authors consider coherent source for SAC-OCDMA systems for various applications such as Passive Optical Network (PON) [18][19][20][21], Free Space Optical (FSO) [22] and wireless optical networks [23].…”