Abstract
This paper proposes a coherent multilevel polarization shift keying (MPOLSK)
modulation scheme using the spatial diversity detection in a free-space optical (FSO)
turbulence channel. The symbol error probability (SEP) analysis for the proposed MPOLSK
system under various turbulence regimes has been carried out. The power penalty caused
by the phase tracking error has been investigated. For instance, the error floors of
1.3× 10<sup>-5</sup> and 3.4× 10<sup>-3</sup> are observed for 8POLSK with the phase
tracking variances of σ<sub>Δ</sub> = 0.3 and 0.5, respectively. The maximum ratio
combining technique has been applied in the MPOLSK receiver in order to improve the SEP
performance. To achieve a SEP of 10<sup>-9</sup>, the spatial diversity gains required for a
16POLSK-FSO employing four detectors are ~5.8, ~15.8, and ~13.7
dB in weak, moderate, and strong turbulence regimes, respectively.
© 2012 IEEE
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription