Abstract
This article investigates the impact of a two-segment Quantum Cascade Laser (QCL) based repeater on the performance of a Free Space Optical (FSO) communication link. The transmitter side of the FSO link consists of a single section QCL which emits short optical pulses at 9 μm into the free space. An optical repeater unit comprising of a Quantum Well Infrared Photodetector (QWIP), high-gain, low-noise transimpedance amplifier and two-segment QCL (gain section and saturable absorber section) regenerates the pulses with increased power levels. The link parameters namely Signal-to-Noise ratio (SNR), Bit Error Rate and Channel Capacity are computed for the FSO link in the presence and absence of repeater. It is found that the two-segment QCL based repeater improves the range of the FSO link by 640.2 m for a BER of 10−9. Further, an SNR enhancement of 28.53 dB is observed in the FSO link due to the introduction of repeater. The link also provides a maximum capacity of 9.48bps/Hz.
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