Optical CDMA with Embedded Spectral-Polarization Coding over Double Balanced Differential-Detector
نویسندگان
چکیده
A spectral-polarization coding (SPC) optical code-division multipleaccess (OCDMA) configuration structured over arrayed-waveguide grating (AWG) router is proposed. The polarization-division double balanced detector is adopted to execute difference detection and enhances system performance. The signal-to-noise ratio (SNR) is derived by taking the effect of PIIN into account. The result indicates that there would be up to 9-dB SNR improvement than the conventional spectral-amplitude coding (SAC) structures with WalshHadamard codes. Mathematical deriving results of the SNR demonstrate the system embedded with the orthogonal state of polarization (SOP) will suppress effectively phase-induced intensity noise (PIIN). In addition, we will analyze the relations about bit error rate (BER) vs. the number of active users under the different encoding schemes and compare them with our proposed scheme. The BER vs. the effective power under the different encoding scheme with the same number of simultaneous active user conditions are also revealed. Finally, the polarization-matched factor and the difference between simulated and experimental values are discussed.
منابع مشابه
Hybrid WDM and Optical Spectral Amplitude Coding with Array Waveguide Gratings over Fiber-to-the-Home Network
The hybrid wavelength-division multiplexing and optical code-division multiple-access scheme for EPON (called WDM/OCDMA-EPON) is presented over fiber-to-the-home (FTTH) network. In this study, each ONU (optical network unit) group is assigned the maximal-length sequence (M-sequence) code which is popularly used for spectral amplitude coding in OCDMA network. Hence, the proposed scheme is suitab...
متن کاملDesign of Multiweight Unipolar Codes for Multimedia Optical CDMA Applications Based on Pairwise Balanced Designs
A novel class of constant-length variable-weight optical orthogonal codes is proposed that can support multimedia services with different data rates and quality-of-service requirements. The construction is based on the pairwise balanced designs, or more specifically, on an incidence structure defined on an integer lattice. Proposed codes are suitable for spectral-amplitude coding, fast-frequenc...
متن کاملExperimental Analysis of Receiver Performance of Optical CDMA System Using DPSK and OOK Modulation Through Balanced Detection and Optical Thresholding Techniques
In this paper, the performance of optical code division multiple access (OCDMA) system is studied using differential phase shift keying (DPSK) with balanced detection (BD) and optical thresholding. For the OCDMADPSK receiver, the performance parameters (i) bit error rate (BER), (ii) receiver sensitivity and (iii) spectral efficiency for asynchronous multiple access network are evaluated and com...
متن کاملHybrid MQC/M-Matrices Coding over Non-Coherent Spectral/Spatial Optical CDMA Networks
By combining Modified quadratic congruence (MQC) codes with M-sequence codes, a hybrid MQC/M-matrices coding over spectral and spatial domains is proposed for spectral-amplitude coding optical code-division multiple-access network. The system performance evaluation shows better result than the one of the previous system using M-matrices coding scheme.
متن کاملNonlinear Multiuser Receiver for Optimized Chaos-Based DS-CDMA Systems
Chaos based communications have drawn increasing attention over the past years. Chaotic signals are derived from non-linear dynamic systems. They are aperiodic, broadband and deterministic signals that appear random in the time domain. Because of these properties, chaotic signals have been proposed to generate spreading sequences for wide-band secure communication recently. Like conventional DS...
متن کامل