Research Article
Free Space Optical MIMO System Using PPM Modulation and a Single Optical Amplifier
@INPROCEEDINGS{10.1109/CHINACOM.2007.4469440, author={Qianling Cao and Maite Brandt-Pearce and Stephen G. Wilson}, title={Free Space Optical MIMO System Using PPM Modulation and a Single Optical Amplifier}, proceedings={2nd International ICST Conference on Communications and Networking in China}, publisher={IEEE}, proceedings_a={CHINACOM}, year={2008}, month={3}, keywords={MIMO Optical amplifiers Optical modulation Optical noise Optical receivers Optical transmitters Pulse amplifiers Pulse modulation Semiconductor optical amplifiers Stimulated emission}, doi={10.1109/CHINACOM.2007.4469440} }- Qianling Cao
Maite Brandt-Pearce
Stephen G. Wilson
Year: 2008
Free Space Optical MIMO System Using PPM Modulation and a Single Optical Amplifier
CHINACOM
IEEE
DOI: 10.1109/CHINACOM.2007.4469440
Abstract
The use of an optical pre-amplifier in a multiple laser multiple receive aperture system for atmospheric line-ofsight optical communications is investigated. Multiple transmitreceive paths serve to fight channel fading due to clear air scintillation. Using orthogonal polarization and repetition coding cross two lasers is shown to provide transmitter diversity. Receiver diversity can be obtained by using optical phase shifters to counter channel phase offsets. Binary pulse position modulation (PPM) is proposed and analyzed in the presence of background radiation and amplified spontaneous emission noise. Using an optical pre-amplifier in a multiple-input/multiple-output channel results in significantly better performance than using an electrical amplifier.