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Fedotov A, Ustimchik V, Rissanen J, et al. Active tapered double-clad fiber with low birefringence. Opt Express. 2021;29(11):16506-16519doi: 10.1364/OE.421958.
Fedotov, A., Ustimchik, V., Rissanen, J., Kolosovskii, A., Voloshin, V., Vorob'ev, I., Gumenyuk, R., Chamorovskiy, Y., & Filippov, V. (2021). Active tapered double-clad fiber with low birefringence. Optics express, 29(11), 16506-16519. https://doi.org/10.1364/OE.421958
Fedotov, Andrei, et al. "Active tapered double-clad fiber with low birefringence." Optics express vol. 29,11 (2021): 16506-16519. doi: https://doi.org/10.1364/OE.421958
Fedotov A, Ustimchik V, Rissanen J, Kolosovskii A, Voloshin V, Vorob'ev I, Gumenyuk R, Chamorovskiy Y, Filippov V. Active tapered double-clad fiber with low birefringence. Opt Express. 2021 May 24;29(11):16506-16519. doi: 10.1364/OE.421958. PMID: 34154212.
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Opt Express. 2021 May 24;29(11):16506-16519. doi: 10.1364/OE.421958.

Active tapered double-clad fiber with low birefringence.

Optics express

Andrei Fedotov, Vasilii Ustimchik, Joona Rissanen, Alexander Kolosovskii, Victor Voloshin, Igor Vorob'ev, Regina Gumenyuk, Yuri Chamorovskiy, Valery Filippov

PMID: 34154212 DOI: 10.1364/OE.421958

Abstract

We addressed the problem of a state of polarization (SOP) drift caused by heating under intense clad pumping in different types of active tapered double-clad fibers. We investigated experimentally the variations of the SOP and degree of polarization (DOP) under clad pumping in polarization-maintaining (PANDA type) and regular (non-PM) Yb-doped double-clad large mode area tapered fibers. We discovered that the birefringence of active fibers is highly dependent on the launched pump power. To solve the problem of the SOP drift in active large mode are fibers, we, for the first time to the best of our knowledge, presented an active double-clad fiber with low intrinsic birefringence as a gain medium. An Yb-doped spun tapered double-clad fiber (sT-DCF) with intrinsic birefringence as low as 1.45×10

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