Abstract
In this paper, we comprehensively analyze the impact of four wave mixing (FWM) on the performance of incoherent multi-wavelength optical code-division multiple-access (MW-OCDMA) systems. We also consider many other interferences and noises, including multiple access interference, optical beating interference, and receiver noise, in the analysis. From the numerical results, we can find the power ranges of different MW-OCDMA systems, in which the impact of FWM is dominant and consequently results in an increase in the bit-error rate of the systems. We also find that the impact of FWM becomes more severe when the frequency spacing is small and/or dispersion-shifted fiber is used. In addition, we quantitatively discuss the impact of FWM on the number of supportable users and power penalty in the MW-OCDMA systems.
Highlights
Optical communication systems have been playing an important role in telecommunication networks in general and access networks in particular
We have theoretically analyzed the impact of four wave mixing (FWM) on the performance of MW-optical code-division multiple-access (OCDMA) systems considering many other noises and interferences
We presented a quantitative discussion about the impact of FWM on various aspects of MW-OCDMA system performance, including the bit-error rate (BER), the number of users, and the power penalty
Summary
Optical communication systems have been playing an important role in telecommunication networks in general and access networks in particular. In order to make use of the vast bandwidth provided by optical fiber, multiple-access techniques have been proposed, such as time-division multiple-access (TDMA), wavelength-division multiple-access (WDMA), and optical code-division multiple-access (OCDMA). First and the most important one is that OCDMA allows users to access the network asynchronously and simultaneously without strict timing synchronizations and wavelength managements as in the cases of TDMA and WDMA, respectively. In OCDMA systems, transmitted signal can be encoded using either time or frequency domain. Incoherent multi-wavelength OCDMA (MW-OCDMA) is the class of OCDMA technique that uses the spectral amplitudes of carrier signal to encode data offers better spectral efficiency than that of the time-domain counterpart [2,3]. For design and deployment of MW-OCDMA in access networks, it is necessary to investigate the effects of physical layer impairments on the performance of MW-OCDMAbased systems. Though there have been many works devoted to this endeavor, including system performance analysis considering various noise, interferences such as receiver noise, multiple access interference (MAI), optical beating interference (OBI), and dispersion [5,6,7,8,9,10,11,12], the impact of four wave mixing (FWM), a nonlinear effect related to multi-wavelength transmission, has not been considered
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