Experimental study on activating bismuth active centers in bismuth/erbium co-doped optical fiber by ionizing radiations

Luo, Yanhua; Yan, Binbin; Stancălie, Andrei; Ighigeanu, Daniel; Neguţ, Daniel; Sporea, Dan; Wei, Shuen; Fu, Xinghu; Wen, Jianxiang; Wang, Tingyun; Sun, Xiaohong; Peng, Gang-Ding

doi:10.1016/j.optmat.2024.115456

Cited by 1 publication

(1 citation statement)

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“…So far, many mechanisms for bismuthrelated NIR luminescence have been shown, which included different oxidation states of bismuth, the presence of Bi clusters and the presence of BiO or Bi 2 dimers [3], [7], [8], [9], [10]. Recently, most scienti c teams have considered that the cause of broadband luminescence is due to the existence of bismuth active centers (BACs), where multiple BACs can be mutually excited in different types of glasses [11], [12], [13], [14], [15]. Interestingly, the spectral properties can be tuned by changing the structural network of the glass, and consequently, by the glass composition.…”

Section: Introductionmentioning

confidence: 99%

Gain determination of new erbium - bismuth doped germanium silicate optic glass for double-band optical amplification

Mareš,

Jeřábek,

Šmejcký

et al. 2024

Preprint

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This research focuses on the gain measurement and modeling of optical silica-germanium glass doped by erbium and bismuth activators to implement a two-band planar optical amplification. Using two activators, bismuth active centers with germanium (BAC-Ge) expand the amplification of the near-infrared bandwidth up to 1650 nm, where the optical attenuation of telecommunication fibers is less than 0.3 dB/km. We described the amplification mechanism based on the luminescence spectral response of the activators. We determined the differential amplification gain of the fabricated active glasses using a pulse measurement method and the calculation of the authentic model using waveguide propagation equations. A single source with a wavelength of 1480 nm was used for pumping in both optical bands. The emission and absorption cross-section coefficients were determined from the luminescence spectrum of the glasses by the Füchtbauer-Ladenburg equation with a Gaussian approximation and McCumber's theory. The calculated differential gain values are in good agreement with the measurement results. Our research leads to the conclusion that BAC-Ge optical activity is conditioned by the location of Bi atoms in the germano-silicate glass matrix with high GeO2 content.

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