Performance Comparison among Different Chirping Methods of Fiber Bragg Grating for Dispersion Compensation

In this paper, different Fiber Bragg Grating chirping methods are compared. Fiber Bragg Grating, which is a well-known dispersion compensation component, is utilized to propose a new system model for dispersion compensation. It has been used with the Tanh apodization function and different chirp functions to provide a Chirped Fiber Bragg Grating. In addition, a low-pass Gaussian filter is added to the model to enhance its performance in terms of Q-factor, BER, and eye diagram. The comparison is made via Optisystem, whereas some results were analyzed via Python. Simulation and analytical results confirm that the Q-factor, BER, and eye diagrams of the proposed system with linear chirping show superior performance compared to other chirpings for 28km and more fiber lengths. The values of Max Q-factor and Min-BER with 40km fiber length were 29.5524 and $\mathbf{9.3407}^{\ast}\mathbf{10}^{\wedge}-\mathbf{182}$ for the proposed system with linear chirping, 26.897 and $\mathbf{5.410}^{\ast}\mathbf{10}^{\wedge}-\mathbf{135}$ with quadratic chirping, 25.263 and $\mathbf{3.531}^{\ast}\mathbf{10}^{\wedge}$- 141 with square root chirping, and 22.582 and $\mathbf{5.236}^{\ast} \mathbf{10}^{\wedge}$- 105with cubic root chirping. Finally, as 40km is the maximum link length proposed between Base-Stations and Base-Band Unit pool in C-RAN 5G networks, therefore linear chirping is the best candidate compared to other methods.