The Research On Wide-band Luminescent Glass And Fiber Based On Nanoporous Silica Glass

With the popularization of mobile terminals and the upgrade of 4G network,the demand for data communications has showed explosive growth.The dense wavelength division multiplexing system is faced with enormous pressure for capacity expansion.Erbium-doped fiber amplifiers,a key component,has always limited the communication bandwidth of the system to 38nm.The gain bandwidth of Erbium-doped fiber amplifiers depends on Erbium-doped fibers.At present,Erbium-doped fibers is fabricated by improved chemical vapor deposition method.There is no mature preparation technology which is larger than 38nm for ultra wide-band Erbium-doped optical fibers.Therefore,the study of ultra wide-band and high gain Erbium-doped glasses and fibers have great scientific significance and wide application prospect.In this paper,Erbium-doped glass fiber was prepared based on nanoporous silica glass and its broadband amplification performance was tested and analyzed.The Bismuth-Aluminum codoped porous glasses were prepared by adjusting the H₂ flow rate,sintering temperature,etc.And its fluorescence properties were investigated.In terms of preparation and performance analysis of nanoporous silica glass,the method of preparing nanoporous silica glass was introduced.Several important steps such as heat treatment phase separation,thermal acid leaching and solution doping were analyzed.Nanoporous silica glass with better properties was prepared by optimizing and improving the process.Methods for characterizing the properties of nanoporous silica glass were also described.In terms of preparation and performance study of Ebium-doped silica glass fiber,the energy level structure of Erbium ion,the basic structure of Erbium-doped fiber amplifiers and the performance parameters of amplifiers were introduced.Sch as gain,bandwidth,noise figure,etc.The Erbium-doped silica glass fiber was prepared based on nanoporous silica glass.The testing platform was built.The absorption,gain,loss and other parameters were tested and analyzed.We report on a new kind of Bismuth-Aluminum codoped porous glass,which was prepared by sintering of nanoporous silica glass,passing into a small amount of H₂.Finally,a series of compact silica glass with reddish-brown color were fabricated.The nanopore morphology of the glass samples was observed by field emission scanning electron microscopy.The nano-pore size was 2.5nm-7.5nm.A suitable H₂ flow was investigated under the condition of 0.25Bi-0.44Al.The absorption spectra,1.2?m fluorescence spectra and fluorescence lifetimes were measured and investigated,along with the analyses of a broad full width at half maximum.The obtained bandwidth and fluorescence lifetimes with0.15Bi-2.0Al porous glass were 240nm and 641?s,respectively.The Bismuth ion content in the glass was 3200ppm.It can be seen from the X-ray diffraction pattern that the glass is suitable to be drawn fiber.The results indicate that Bismuth-Aluminum codoped porous glass is a potential material for new ultra-wideband fiber amplifiers in the near-infrared band.