Ms. Etty J. Lee Profile

Etty J. Lee

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Proceedings Article | 25 September 2007 Paper

Performance of diversity coherent and diversity incoherent receivers for optical communication over the clear turbulent atmosphere in the presence of an interferer

Etty Lee, Vincent Chan

Proceedings Volume 6709, 67090O (2007) https://doi.org/10.1117/12.733399

KEYWORDS: Homodyne detection, Receivers, Optical communications, Photons, Signal detection, Telecommunications, Atmospheric optics, Interference (communication), Modulation, Atmospheric turbulence

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The fades and background noise that are seen by the receiver(s) in clear atmospheric optical communication can be mitigated with diversity and coherent receivers. However, in certain applications, one may need to be concerned with not only fades/outages, but also with an interferer that may be actively trying to interfere with our communication by sending his own optical signal towards our receiver(s). It is important to understand how our optical system performs in the presence of such an interferer. In this paper, we describe two potential interferer strategies when our communication system uses Diversity Direct Detection and two potential strategies when our system uses Diversity Homodyne Detection. We also derive and plot the performance of our systems in these scenarios, both in the absence of and in the presence of clear atmospheric turbulence. We find that if the interferer optimizes the fraction of bits over which it spreads its power, it degrades the performance of our Diversity Direct Detection or Diversity Homodyne Detection significantly more than if it were simply on all the time. Moreover, we find that the performance of Homodyne Detection with no diversity and Direct Detection with no diversity are almost the same in the presence of analogous interferers, and that diversity improves Homodyne Detection's performance while worsening Direct Detection's performance.

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