The Preparation And Investigation Of Er Doped Antimony-silica Glass And Fiber

With the widely commercial use of the 5G technology,the demand for high-capacity and high-speed optical fiber communication network is increasing.As an important part of the modern optical fiber communication network,the gain bandwidth of the fiber amplifier plays an important part of improving communication capacity.But the gain bandwidth of the fiber amplifier is limited by the narrowband luminescence of Er³⁺ions.The other optical amplifiers are difficult to replace EDFA to be used in optical fiber communication networks at present.Among the materials for broadband gain,the transition metal ion-doped material and the Bi-doped materials exhibit broadband near-infrared emission,but the emission efficiency is relatively low.In this thesis,we focus on developing a novel antimony-silicide glass and fiber with broadband infrared luminescence of Er³⁺ion,and explores the relationship between the structure and performance,discussing the mechanism of spectral evolution.The main research results of this paper are summarized as follows:(1)The Er-doped antimony-silica glass and fiber have been prepared.It has been found that Sb replaces Si in the glass network structure and forms the glass network structure with Si,thereby reducing the phonon energy of the glass system.The emission intensity of the glass can be enhanced,and the full-width at half-maximum can be expanded from 61 nm to82 nm.Under irradiation with electron beam,phase separation can be observed.The results provide the evidence about the origin of the observed phase separation in antimony-silica glass.The antimony-silica glass fiber has been prepared by a core melting method.The fiber shows the structure with core-cladding configuration,and the boundary between core and cladding is clear.Compared with the commercial L-band fibers,antimony-silica fibers show a higher gain and broadband gain,and it indicates that the antimony-silica glass fiber is a good gain medium material.(2)The Er-doped lanthanum-antimony-silica glass with high temperature stability has been prepared.It has been found that La can destroy the network structure of antimony-silica glass,and effectively improve the rare earth doping concentration,enhancing the lifetime of Er³⁺:⁴I_13/2 energy level.However,the emission spectrum of the lanthanum-antimony-silica glass is narrowed compared to the antimony-silica glass,and the full-width at half-maximum of near infrared is reduced.The thermal stability of the glass has been verified by heat-treatment.The results indicate that the addition of La may increase the stability of the glass which offers the feasibility for preparation of lanthanum-antimony-silica glass fibers.The fiber exhibits the core-cladding configuration,and the boundary between core and cladding is clear.The ratio of core diameter and cladding diameter is the same as that of the preform.The lanthanum-antimony-silica glass fiber exhibits a wider near-infrared emission compared with P/Al co-doped silica fiber and the signal enhancement phenomenon has been achieved in fiber.(3)Er-doped potassium-antimony-silica glass with flat L-band luminescence characteristics has been prepared.It can be found that the phonon energy of the glass is increased,and the near-infrared emission spectrum is red-shifted.The luminescence spectrum of glass is narrowed,but the L-band emission at 1640 nm is flat.The addition of K ions increases the rare earth doping concentration of the glass to 3.5%,and the lifetime increases from 2.5 ms to 6.6 ms.The near-infrared emission feature change of glass is mainly associated with the energy level splitting induced by K ion with the large ion.The near-infrared spectra of antimony-silica glass doped with various elements has been investigated.With the increasing of the ion radius of alkali metal,the spectral change becomes clear.In contrast,the spectrum does not exhibit notable change with the alkaline earth metal ions with the same ionic radius.It might be associated with the fact that the large charge number of alkaline earth metal ions weaken the force between alkaline earth metal ions and oxygen ions by increasing the ionic radius.