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Intense green upconversion emission in Tb^3+/Yb^3+ codoped alumino-germano-silicate optical fibers
Lin, Aoxiang,Liu, Xueming,Watekar, Pramod R.,Guo, Haitao,Peng, Bo,Wei,Lu, Min,Han, Won-Taek,Toulouse, Jean The Optical Society 2010 Applied optics Vol.49 No.9
<P>We observed intense green upconversion emission from Tb(3+) centered at 546 nm due to transition D(4)5-->F(5)7 in Tb(3+)/Yb(3+) codoped alumino-germano-silicate optical fibers by direct excitation of Yb(3+) ions with a laser diode at 976 nm. A two-photon cooperative energy transfer upconversion among a pair of Yb(3+) donor ions and a Tb(3+) acceptor ion are responsible for the observed green emission. Appropriately increasing the concentration of Tb(3+) relative to Yb(3+) was found to facilitate the energy transfer upconversion process from Yb(3+) to Tb(3+), while an excess of Tb(3+) ions inversely introduced more of the concentration quenching effect and phonon-assistant backward energy transfer from Tb(3+) to Yb(3+) and, therefore, damaged the observed green emission. The intensity of the observed green emission was found optimum for a concentration ratio of Tb(3+) to Yb(3+) of 2:1 in alumino-germano-silicate optical glass fibers.</P>
Transmission Over 1050-km Few-Mode Fiber Based on Bidirectional Distributed Raman Amplification
Esmaeelpour, Mina,Ryf, Roland,Fontaine, Nicolas K.,Haoshuo Chen,Gnauck, Alan H.,Essiambre, Rene-Jean,Toulouse, Jean,Yi Sun,Lingle, Robert IEEE 2016 Journal of Lightwave Technology Vol.34 No.8
<P>We characterize the distributed Raman amplification in a 70-km three spatial-mode few-mode fiber with different pump configurations and demonstrate bidirectional pumped Raman amplification and 1050 km combined wavelength-division and spatial-division multiplexed transmission in the same fiber with a zero net gain fiber span.</P>
Tellurium-enhanced nonresonant third-order optical nonlinearity in a germanosilicate optical fiber.
Lin, Aoxiang,Liu, Xueming,Watekar, Pramod R,Zhao, Wei,Peng, Bo,Lu, Min,Wei, Wei,Sun, Chuandong,Wang, Yishan,Han, Won-Taek,Toulouse, Jean Optical Society of America 2009 Applied Optics Vol.48 No.26
<P>A tellurium-doped germanosilicate optical fiber was developed by modified chemical vapor deposition and solution doping techniques. Using the continuous-wave self-phase modulation method, the nonresonant nonlinear refractive index, n2, was measured to be 5.52 x 10(-20) m2/W, which is 2 to 3 times that of the undoped germanosilicate glass fiber. Polyhedron structures TeO3 and TeO4 with GeO4 and SiO4 are believed responsible for lower phonon energy, more nonbridging oxygens, and a larger hyperpolarization, leading to the observed higher nonresonant optical nonlinearity.</P>