Performance Evaluation of Various Dispersion Compensation Modules

Pulse broadening is prominent performance degrading factor which limits total speed and distance coverage of optical communication systems (OCS). In order to compensate the effects of pulse broadening, two techniques are reported widely such as dispersion compensation fiber (DCF), and Fiber Bragg Gratings (FBGs). However, DCF is expensive and FBGs are shown less efficiency of pulse width reduction (PWR). Therefore, a cost effective and highly efficient PWR module is required to cope up with pulse broadening issue. In this research article, various PWR techniques are considered and assessed to investigate an economical method having significant PWR. In this proposed work different chirp functions are applied to FBG, DCF, combined technique using DCF with optimized-linearly-chirped-tanh FBG and two FBGs along with a DCF module. System is evaluated and studied with a 10 GB/s. optical link over a 100 km SMF-28 optical fiber. FBG with square root chirping, cube root chirping, exhibit 72.41%, 65.5% PWRE respectively. Linear chirping performed best out of three chirping profiles of FBG with the PWRE of 75.86%. DCF alone yields an improved efficiency of 93.7%; however, the use of DCF makes system costly. Further the joint method of DCF and FBG is analyzed and enhanced the PWRP to 95.8% (approx. 96%) and provides the good pulse shape with economical cost. Finally, two linearly chirped and tanh apodized FBGs are joined with a DCF and the results achieved are 97.9% (approx. 98%) PWRE with low cost. FBG + FBG + DCF modules is found out to be best performing in terms of efficiency and also provide low cost. The sequence of performance of different modules inquired is given as: FBG + FBG + DCF > FBG + DCF > DCF > Linearly chirped FBG > Square root FBG > Cube root chirped FBG.