Spectrum Characteristic Of Tm³⁺-doped Materials

ABSTRACT:There has been an ever growing demand for optical fiber communication capacity and system integration, driven mainly by the rapid growth of the Internet. Erbium-doped fiber amplifier (EDFA) and wavelength-division multiplexing (WDM) technology enable the transmission of information in long distance and great capacity. However, with the further development of the Internet, conventional silica-based Erbium-doped fiber amplifiers, most of which work in the C-band (1530nm～1565nm), cannot meet the requirement of the growing fiber system any more. Consequently, much more attention has been paid to light amplification in the S-band and S+-band (1450nm～1520nm). Since it is impractical to achieve the above amplification using Erbium ions, investigating other rare earth ions' luminescence properties is becoming increasing important.There is little research into telluride-based fiber, compared to large amount of that into the silica-based fiber. In this paper, both theory and experiment are analyzed about the luminescence properties of telluride-based fibers doped with neodymium, erbium and thulium respectively. This work has laid a solid foundation for the future rare earth doped fiber's research. Main work of the paper is summarized as follows:(1) Theoretically analyzed the Amplified Spontaneous Emission (ASE) of Tm3+ in the 1900nm band. First in the time the paper suggested a theoretical model of the ASE of Tm3+ doped fiber in the 1900nm band. By solving rate equations and propagation equations, the paper analyzed the distribution of pump and ASE light's power along the fiber. Besides, the relation between ASE's spectrum energy with fiber length and pump energy has been investigated.(2) The spectrum properties of different rare earth ion doped telluride-based fibers have been investigated using pump light at 808nm and 980nm respectively. Analysis of the resulting spectrum shows that an obvious blue light is generated and upper level energy conversion is confirmed.(3) The performance of Thulium and Ytterbium co-doped telluride-based is studied. Approaches are suggested for solving frailty of telluride-based fibers and difficulty of splicing with conventional silica-based fibers. Besides, the placement and connection of telluride-based fibers is investigated. The paper has also studied the different performances between fiber and bulk materials under the same pump wavelength.(4) The optimal pump wavelength in the 1064nm range for the Tm3+ doped fiber amplifier in the 1470nm band is investigated using a theoretical model. This provides a good reference for future research into the S-band amplifiers.