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Fiber Bragg gratings (FBGs) are one of the most effective technologies because of their suitability in many applications of the fiber techniques. Moreover, it can be utilized in sensing elements and estimating the physical parameters of the optical fiber. In the current research, various fiber bragg lengths are considered and a comparative investagtion is made for the performance of the refractive index modulation at two different apodization profiles namely: Gaussian index profiles and uniform index profiles. Also, a comparative study of the optical communication system performance has been carried out of refractive indexes with two apodization functions. A comprehensive comparison in terms of gain, noise figure, OSNR, quality factor, bit error rate and power has been performed where the performance of the optical system is studied under various optical channel lengths (from 25 km to 100 km) with various FBG lengths, which are ranged from 4 mm to 14 mm in both apodization profiles, i.e. uniform profile and Gaussian profile. In order to carry out the simulation of the performance RZ, the optisystem version 9 is used for single channel based on over single mode fiber. The results showed that the maximum Q.F. as the performance parameter is obtained at the FBG length of 8 mm at all optical lengths. Moreover, the varation effect of optical fiber channel length was greater than the varation effect of refractive index for all the studied parameters (gain, noise figure, OSNR, quality factor, BER, and power) for two apodization functions.

Assessment of optimal Bragg grating length for optical performance using two apodization functions