Abstract
The present work discusses the development and simulative investigation of a high-capacity wavelength division multiplexed free space optics (FSO) transmission system. A novel 3-D orthogonal modulation scheme is proposed, which simultaneously capitalizes on different signal properties of an optical laser beam, i.e., intensity, phase, and state of polarization to transmit three independent 40 Gb/s data streams on a single optical carrier signal, realizing a net 120 Gb/s transmission rate per wavelength channel. 32 such independent wavelength channels are multiplexed in the proposed FSO system and its performance is numerically investigated over different climate conditions with respect to range, Quality factor, bit error rate, and eye diagrams of the information signal using Optisystem simulation software. Through numerical simulations, we report faithful 3.84 Tb/s transmission over free space channel with maximum link range varying from 1.6 to 40 km depending on the external climate conditions.
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