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Hello, welcome to the lab session of introduction to photonics, I am Bhagat. Today I will be demonstrating to you the experiment of Mach-Zehnder modulator. So through the theory classes, we have been learning about modulation of light and density by modifying different aspects of light such as phase polarization, etc. So this modulator which I am going to demonstrate today is based on the nonlinearity property, which is nothing but the Pockels effect of light and it is Chi 2 effect. We are giving a high voltage across the nonlinear crystal, it will effectively add a delay in the light phase. And what I am handling is a Mach-Zehnder modulator here which is nothing but an electro optical device. So the main aim for today is to first to characterize this Mach-Zehnder modulator, then I will show you what all operation points it can be biased on and how we can give a modulation signal. And I will show you how the modulation frequency varies and the frequency modulation principleof the Mach