Research On The Characteristics Of Ultra-Wideband Fluorescent Light Sources Based On Bismuth-Doped Fiber

With the rise of emerging technologies such as big data and cloud computing,the amount of information has dramatically increased,putting forward higher requirements on the transmission capacity of optical fiber communication systems.Since erbium-doped(Er3+)fiber mainly operates at 1530-1610 nm,the currently widely used optical fiber communication system is limited to work in the C + L band.The water free silica optical fiber has low loss in the wide range of 1100?1700 nm,providing the possibility of the full-band optical fiber communication.Recently,bismuth-doped glasses and fibers have been reported to have ultra-wideband fluorescence of about 500 nm with luminescence centers around 1.3 ?m.In particular,Bismuth/Erbium Co-Doped Fiber(BEDF)with ultra-wideband fluorescence of 1000 to 1570 nm is a promising active material for ultra-wideband broadband and tunable fiber lasers.Broadband light sources have very wide and important applications in many fields such as optical communication,light sensing and spectrum analysis.The study of ultra-wideband light sources not only plays a great role in the application and development of full band optical fiber communication in 1100?1600 nm,but also can promote the development of large-capacity optical fiber sensing,ultra-wideband optical spectrum measurement,optical information processing and other fields.Therefore,the research of bismuth-doped fibers and ultra-wideband fluorescent light sources has attracted much attention at home and abroad.In this paper,the near infrared fluorescence characteristics of bismuth/erbium co-doped fiber and the ultra-wideband light source based on bismuth/erbium co-doped fiber were studied.The main work includes:(1)Fluorescence characteristics of a bismuth erbium co-doped fiber at room temperature and low temperature were studied in detail,including the influence of different pump wavelength and pump power on the fluorescence characteristics of BEDF,especially the fluorescence of BEDF at low temperature.The main differences at low temperature and normal temperature were analyzed and compared.The energy transfer process of the luminescent center of BEDF by 830 nm laser pumping was studied by comparing with EDF at low temperature.(2)Theconfiguration influence upon the fluorescence power of broadband light source is studied.It is found that forward structure and one-way structure has some advantages over backward structure and two-way structure.The main reason is due to the lack of the ultra-wideband device,and thehe large insertion loss of the optical device itself has a great impact on the result.(3)In the case of 830 nm laser pumping,the ultra-wideband fiber source was fabricated by using bismuth erbium co-doped fiber,and the ultra-wideband radiation characteristics of the light source were systematically studied.The result demonstrates that BEDF has great potential for ultra-wideband applications.