Recent technological advances have allowed network users to transfer large files. This has increased the network traffic in Telecom and Data centres. Optical fibre communication has large bandwidth and channel capacity to meet the demands. Silicon photonics aims in improving the data transfer with efficiency on chip. Modulators play potent role in the process. The work deals in the analysis on improving the favoured Mach-Zehnder modulator (MZM). The results show the number of ring resonators that can be used with respect to the wavelength to improve the extinction ratio. Extinction ratio is very important when it comes to processing valuable data and that is improved with the help of the ring resonators in MZM. © 2018, Springer Nature Singapore Pte Ltd.