Pokorný J, Aubrecht J, Kamrádek M, Švejkarová B, Vařák P, Grábner M, Peterka P. Depressed-cladding thulium-doped fiber for applications below 1800 nm.
OPTICS EXPRESS 2024;
32:17966-17976. [PMID:
38858964 DOI:
10.1364/oe.523168]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2024] [Accepted: 04/12/2024] [Indexed: 06/12/2024]
Abstract
We present a thulium-doped silica fiber, featuring a depressed cladding, for applications at wavelengths below 1800 nm. The depressed cladding is used as a distributed filter suppressing amplified spontaneous emission at longer wavelengths, which helps promote emission at shorter wavelengths. We describe the fiber design process that was carried out by using a combination of numerical methods. The fiber was prepared in-house by a combination of the standard modified chemical vapor deposition method and nanoparticle doping. We demonstrate the effectiveness and tunability of ASE filtering, which is influenced by fiber bend radius and its variation.
Collapse