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Abstract:In this paper, dispersion compensating fibers (DCF) are used to compensate the positive dispersion accumulated over the length of the fiber at 10Gbits/sec and 250 km of optical fiber with 50 km of DCF. Three schemes (Pre-compensation, post-compensation and symmetrical-compensation) of dispersion compensation with DCF are proposed. The simulated transmission system has been analyzed on the basic of different parameters by using OptiSystem 7.0 simulator. The results of three dispersion compensation methods are compared in terms of four parameter, which are Q-factor, BER, Eye height and threshold value, investigated at the receiver end. Further, it has been observed that the system needs proper matching between EDFA gain and the length of the fiber for the optimum performance.

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Spectral amplitude coding optical code division multiple access (SAC-OCDMA) is a promising innovation for burst and asynchronous environment. This paper endeavors to analyze the efficacy of the proposed optimum SAC-OCDMA system by utilizing enhanced double-weight (EDW) code for six users operating at a bit rate of 60 Gb/s (10×6 Gb/s). Also, an algorithm is designed for EDW code with mapping technique for any weight that can be greater than two. The EDW code is analyzed for bit error rate (BER) and Q-factor using direct detection technique. Further, the system is compared with three dispersion compensating techniques (pre, post and symmetrical). The results indicate that by using symmetrical compensation the maximum usable distance increases to more than twice as compared to without compensation for the targeted BER (10−9), whereas by using p- and post-compensation the BER value increases to 10−13 as compared to without compensation whose BER value is 10−5. The comparison results show acceptable performance improvement.

Fiber Bragg Grating (FBG) is one of the applicable and important components in optical communication system. In this paper, chirped FBG has been studied as a dispersion compensator in an optical communication system for the different lengths of grating and apodization functions. All the simulations are done in OPTISYSTEM 7.0 simulation software at 10 Gbits/sec and 210 km of transmission fiber. The simulated transmission system has been analyzed on the basic of different parameters, which are BER, Q-factor, Output power and Eye height.

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