Broadband tuning of polarization modulation instability in microstructured optical fibers

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2020
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Abstract
The wideband tuning of strong bands generated through polarization modulation instability (PMI) in microstructured optical fibers (MOFs) is reported. Tunability is achieved by exploiting the dependence of the phase-matching condition on the fiber’s chromatic dispersion and birefringence, which is particularly sensitive when the fiber is pumped near the zero dispersion wavelength. MOFs designed to accomplish PMI phase-matching when they are infiltrated with ethanol and pumped at 1064 nm were designed and fabricated. Taking advantage of the large thermo-optic coefficient of ethanol, both chromatic dispersion and birefringence were varied through temperature. Wavelength shifts from 937 nm to 863 nm (anti-Stokes) and from 1231 nm to 1387 nm (Stokes) are demonstrated. Such a tuning range corresponds to a frequency shift between the pump and a PMI sideband ranging from 1274cm−1 to 2189cm−1.
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A. Loredo-Trejo, A. Díez, E. Silvestre, and M. V. Andrés, "Broadband tuning of polarization modulation instability in microstructured optical fibers", Optics Letters, Vol. 45, pp. 4891-4894, 2020.
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