Normalized pulsed energy thresholding in a nonlinear optical loop mirror

M. A. Nahmias, B. J. Shastri, A. N. Tait, M. Eder, Nicole Rafidi, Yue Tian, P. R. Prucnal

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


We demonstrate for the first time, to the best of our knowledge, that a Sagnac interferometer can threshold the energies of pulses. Pulses below a given threshold T are suppressed, while those above this threshold are normalized. The device contains an in-loop tunable isolator and 10.4 m of a highly doped silica fiber. We derive an analytical model of the nonlinear optical loop mirror's pulse energy transfer function and show that its energy transfer function approximates a step function for very high phase shifts (>φ). We reveal some limitations of this approach, showing that a step-function transfer function necessarily results in pulse distortion in fast, nonresonant all-optical devices.

Original languageEnglish (US)
Pages (from-to)3218-3224
Number of pages7
JournalApplied Optics
Issue number11
StatePublished - Apr 10 2015

All Science Journal Classification (ASJC) codes

  • Engineering (miscellaneous)
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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