Abstract
In this work, polarization property of Vertical Cavity Surface Emitting Laser (VCSEL) is investigated for 5 Gbps optical data transmission in a combined link comprising of Single Mode Fiber (SMF) and Free Space Optic (FSO) channel. The VCSEL considered for simulation is biased just above threshold with RZ current pulses to emit narrow polarized optical pulses. After 20 km SMF link, the received power is launched into two different paths using an optical splitter. It is received by an InGaAs PIN photodiode in one path and a coupling lens in other. A split ratio of 2%, provides the minimum power required for the SMF link to maintain a BER ≤10−12, based on the VCSEL considered in the study. The remaining 98 % of power is utilised for FSO transmission beyond the SMF link. The maximum FSO link distances under various loss combinations were found for the two polarized optical pulses, separately. For BER≤10−12, under the combined influence of all losses, an FSO link length of 130 m and 119 m, for x and y polarizations are predicted.
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