Fiber optic networks are highly resistant to external electromagnetic interference. This is because signals propagate through light rather than electrical current inside the fiber. This method of data transmission has gained substantial significance in modern communication networks due to its capacity to deliver high-speed internet and other forms of. Electromagnetic waves in the optical spectrum propagate as guided modes within the core of the optical fiber through the process of total internal reflection. Light as electromagnetic waves Light is a form of electromagnetic radiation and, as such, exhibits wave-like behavior. Fiber is preferred. upling is realized generally by means of optical fiber. Under influence of these fields the polarization plane of light.