40-Gb/s DWDM free-space optical transmission link over 4.4 km

We simultaneously transmit 16 separate 2.5 Gb/s wavelength data channels, with a 200 Ghz channel spacing, error-free, over a horizontal free space distance of 4.4 km. We believe this result represents the largest bandwidth transmitted at one time over such a distance, without the use of optical transmission fiber

Yb{sup 3+},Er{sup 3+} codoped silica-based glasses for planar optical waveguide amplifiers

Spectroscopic properties of Er{sup 3+}-doped and Yb{sup 3+},Er{sup 3+}-codoped sodium- and alumino-silicate glasses, potential planar optical waveguide amplifier materials for 1.55 {mu}m, are investigated. With the exception of {sup 4}I{sub 1 3/2}, multiphonon relaxation is dominant for all Er{sup 3+} excited-state multiplets, allowing efficient population of the emitting {sup 4}I{sub 1 3/2} state by {sup 4}I{sub 1 1/2} excitation around 980 nm. In both glasses, multiphonon relaxation from {sup 4}I{sub 1 3/2} is negligible up to 678 K, and the respective 300 K absolute quantum yields are {similar_to}0.9 for 0.05 mol% Er{sup 3+}-doped samples under low- power {sup 4}I{sub 1 1/2} excitation. OH{sup {minus}} impurities are able to efficiently quench {sup 4}I{sub 1 3/2} excitation. Absolute {sup 4}I{sub 1 3/2} quantum yields are used to predict an optimum Yb{sup 3+},Er{sup 3+} concentration range for sensitization. Yb{sup 3+} codotation strongly enhances pump-light absorption and increases {sup 4}I{sub 1 3/2} population by almost two orders of magnitude in some samples. Relative {sup 2}H{sub 1 1/2}/{sup 4}S{sub 3/2} upconversion luminescence intensities are shown to be a sensitive measure for the substantial internal sample heating observed in Yb{sup 3+} codoped glasses

Optical fiber amplifiers for space-division multiplexing

Recently, space-division multiplexing (SDM) techniques using multi-core fiber (MCF) and few-mode fiber (FMF) have been introduced into optical fiber communication to increase transmission capacity. Two main types of optical fiber amplifiers based on the Erbiumdoped fiber (EDF) and the Raman effect have been developed to amplify signals in the MCF and FMF. In this paper, we reviewed the principles and configurations of these amplifiers. © 2012 Higher Education Press and Springer-Verlag Berlin Heidelberg

PLuminescence properties of Er3+ doped SiO2-ZrO2 prepared using Er-Zr double alkoxide

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