Operation of a passive optical network with subcarrier multiplexing in the presence of optical beat interference

  • Wood T
  • Shankarnarayanan N
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When two lasers carrying subcarrier-multiplexed data operate with
very closely spaced wavelengths, beating between the lasers can occur
which increases the noise at the detector. This effect, optical beat
interference (OBI), can greatly interfere with the operation of these
systems. The authors have observed OBI with DFB lasers in a system
carrying two 155.5-Mb/s data streams. With an optical modulation index
of m=0.8, a bit-error rate floor of approximately 10-2 was
observed due to OBI, which is consistent with the noise measured by an
RF power meter. When m is increased to 1.8, a significant reduction in
OBI was observed, and it was possible to achieve transmission at the 10
-9 level with a penalty of only 1.8 dB due to the presence of

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  • T. H. Wood

  • N. K. Shankarnarayanan

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