Abstract
All-optical relaying techniques are proposed to improve the error
performance and overall distance coverage of free-space optical (FSO)
communication systems. An all-optical amplify-and-forward (OAF) relaying
technique is presented where the received optical field is amplified at each
relay. A novel channel model is developed including field distributions and
weak turbulence. Simulation results indicate that OAF significantly enhances
the BER performance, but is severely degraded by background light. In order
to remove the impact of background noise, an optical regenerate-and-forward
(ORF) relaying technique is also presented. At a bit rate of 10 Gbps, using
two equally-spaced OAF relays under a turbulence-free atmospheric condition
increases the total communicating distance by 0.9 km over direct
transmission at a BER of 10<sup>-5</sup>, while using two ORF
relays provides an additional gain in range of 1.9 km. In general, replacing
OAF relays by ORF relays extends the total communicating distance at a cost
of implementation complexity.
© 2011 IEEE
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