Function and sensitivity of signal processing systems based on addition followed by limiting

Erik Johnson*, Edward H. Sargent

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We show for the first time that signal processing schemes based on noncoherent signal addition will require signal transfer characteristics exhibiting high degrees of curvature. We quantify this by proposing a set of single-input, dual-output, power-conserving transfer functions and generating designs based on these characteristics. We then analyze the sensitivity of such a design scheme to nonidealities in the signal level and device behavior, and show that a sampling operation is only possible for transfer characteristics with residual "low" output of less than about 10% and low intensity reflectivity higher than 98%. For single device signal loss of up to 0.1 dB, we show that the best possible crosstalk-to-noise ratio in a packet forwarder (27 dB), is limited by the availability of the sampling operation.

Original languageEnglish (US)
Pages (from-to)1388-1396
Number of pages9
JournalJournal of Lightwave Technology
Issue number8
StatePublished - Aug 2002


  • Nonlinear circuits
  • Optical data processing
  • Optical limiters
  • Optical switches
  • Packet switching

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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