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An enhancement of data networks security using a hybrid WDM and SAC/Optical CDMA System is proposed. Secure transmission for dedicated users is achieved by overlaying a covert channel onto a multichannel WDM network. The covert channel is spectrally encoded using spectral amplitude coding (SAC) with unipolar Modified Double Weight (MDW) as the signature address code. OCDMA improves service availability...
This paper presents the security enhancement for spectral amplitude coding optical CDMA. The eavesdropper probability of error-free code detection based on hybrid code system is investigated. Enhancement Double Weight (EDW) optical CDMA scheme and M-sequence codes are used as a hybrid code system. The eavesdropper performance is based on observing the authorized transmitted signal based on classical...
This paper presents security performance for incoherent unipolar and bipolar Optical CDMA Network Systems. The eavesdropper performance is investigated, by simulation, based on Modified Double Weight (MDW) Spectral Amplitude Optical CDMA. Our results show that using unipolar OCDMA code schemes based on MDW code system enhances the security with a low cost implementation in comparison to the bipolar...
In this paper, we present a theoretical analysis of the noise resulting from cross-phase modulation in an optical WDM transmission system. Analytical approach has been used to evaluate the bit error rate (BER) performance limitation of a WDM transmission system imposed by crosstalk due to cross-phase modulation and the influence of changing channel spacing for various fiber types on the (BER) and...
We conducted a experimental simulation study to assess the effects of stimulated Brillouin scattering (SBS) on an incoherent optical code division multiple access OCDMA (enhanced double weight EDW-code) system of one and two user at 1 Gb/s over optical fiber with two different transmission distances 30 km and 50 km. SBS causes backward scattering of pump light and this in turn causes a reduction of...
OXADMs reliability and also survivability of the trunk-line optical network used for data communication. This paper describes the analytical modeling of OXADMs and studies their performance as compared to conventional OXC devices. With two restoration schemes, the OXADM prototype system focuses on providing survivability through restoration against failures by means of linear/multiplex and ring protection...
This paper introduces a new optical device model named as an optical cross add and drop multiplexer (OXADM) which has potential use in CWDM metro area networks. The device uses the concepts of combination of optical add/drop multiplexing and optical cross connect between two main transmission lines in order to implement the wavelength routing operation [10]. MEMS optical switches are integrated in...
We present a comprehensive theoretical study of four-wave mixing in optical fiber with exploring four fiber types. The four-wave mixing induced crosstalk noise is described by an expression that is based on NLS equation, and it describes the mutual channel interference optical losses in multi channel optical communications system. The corresponding system of equations has then been numerically integrated,...
We present a comprehensive theoretical study of cross-phase modulation in optical fiber with exploring four fiber types. The cross-phase modulation induced crosstalk noise is described by a system of coupled equations, which describes mutual channel interference optical losses in multi channel optical communications system. The corresponding system of equations has then been numerically integrated,...
Performance analysis is carried out to evaluate the bit error rate (BER) performance limitation of a WDM transmission system imposed by crosstalk due to stimulated Raman scattering. Power penalty evaluated at a BER of 10-9 shows a significant impact of Raman induced crosstalk on the number of wavelengths that can be transmitted. Penalty is higher at higher input power, higher number of channels and...
Performance analysis is carried out to evaluate the bit error rate (BER) performance limitation of a wavelength division multiplexing (WDM) network transmission system imposed by crosstalk due to waveguide grating router (AWG) router. The analysis shows that penalty is higher at higher input power, higher number of wavelengths, larger number of nodes, and higher bit rates, while the BER graphs for...
This paper describes our recent approach toward advanced optical layer networks through the development of optical cross add and drop multiplexing (OXADM). The OXADM node focuses on providing functionally such as transport, multiplexing, routing, supervision, terminating and survivability in optical layer with ring and mesh topologies. OXADM provide survivability through restoration against failures...
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