Design and performance investigation of Gaussian apodized FBG as hybrid dispersion compensation module for long-haul optical link

Abstract A hybrid dispersion compensation module design, using Gaussian apodized fiber Bragg grating and 11 km long dispersion compensation fiber, is proposed for a 111 km long optical link. The proposed module is examined successively with four different chirping techniques. Further, the design is investigated thoroughly in pre-, post- and symmetrical-compensation modes. The performance characteristics of the optimized links are evaluated orderly by quality-factor (Q-factor) values, Eye-diagram and pulse width reduction percentage (PWRP). To further enhance the Q-factor value, optimal parameters of FBG are determined comprehensively by varying the effective refractive index and grating length values. The results show that the proposed dispersion compensation module using Gaussian apodized fiber Bragg grating works well for the quadratic chirping technique. The Q-factor values attained in pre-, post- and symmetrical-compensation modes are 40.5, 49 and 50, respectively, far higher than the values proposed in the literature to date. Thus the proposed technique is best suited for symmetrical and post-compensation modes. The workability of the proposed system is verified using OptiSystem software.