Low temperature spectrum of a fiber loop laser

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Fiber-based multi-wavelength lasers have a variety of important applications in telecommunication and meteorology. We experimentally study a fiber loop laser with an integrated Erbium doped fiber (EDF). The output optical spectrum is measured as a function of the EDF temperature. We find that below a critical temperature of about [Formula presented] the measured optical spectrum exhibits a sequence of narrow and unequally-spaced peaks. An intriguing connection between the peaks' wavelengths and the sequence of prime numbers is discussed. An hypothesis, which attributes the comb formation to intermode coupling, is explored.

Original languageEnglish
Article number128591
JournalPhysics Letters, Section A: General, Atomic and Solid State Physics
StatePublished - 15 Jan 2023


  • Erbium
  • Fiber
  • Laser

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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