Performance Improvement of OOK Free-Space Optical Communication Systems by Coherent Detection and Dynamic Decision Threshold in Atmospheric Turbulence Conditions

Author

Wang, Zixiong ; Zhong, Wen-De ; Yu, Changyuan

Author_Institution

Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore, Singapore

Volume

24

Issue

22

fYear

2012

Firstpage

2035

Lastpage

2037

Abstract

In this letter, we analyze the performance improvement of on-off-keying free-space optical communication systems in atmospheric turbulence conditions due to coherent detection and the dynamic decision threshold (DDT) scheme. Our analytical results show that the DDT scheme provides a 5.7-dB power reduction for achieving a bit error rate of 10^-3 compared with the conventional fixed decision threshold scheme. In addition, the improvement achieved by the DDT scheme is related to the strength of amplitude and phase fluctuations, not to the power of the local oscillator.

Keywords

amplitude shift keying; atmospheric light propagation; atmospheric turbulence; optical links; optical modulation; OOK; amplitude fluctuation; atmospheric turbulence conditions; coherent detection; dynamic decision threshold; free space optical communication systems; on-off keying; phase fluctuation; Adaptive optics; Bit error rate; Coherence; Fading; Optical polarization; Optical receivers; Silicon; Atmospheric turbulence; coherent detection; dynamic decision threshold; free-space optical (FSO);

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2012.2218652

Filename

6301682