Research On Ultra Wideband Light Source Based On Bismuth-erbium Co-doped Fiber

As a key instrument for scientific research and social application,the technical progress of light source is of great significance.In recent years,the rapid development of superfluorescent optical fiber source has been widely used in optical communication and sensing systems due to its advantages of high power,large spectral linewidth,long service life and good wavelength stability.At present,ultra-wideband fiber light sources generally have the defects that the luminous intensity,spectral bandwidth and flatness are difficult to coordinate,which cannot fully meet the practical application requirements.In this paper,based on the principle of amplified spontaneous emission of Bismuth and Erbium ions,A new type of Bismuth-Erbium co-doped fiber with a novel BismuthErbium ion concentration doping formula has been adopted.The feedback research method is used to test and analyze the influence of light source structure,fiber length,pump power,ion doping concentration and other factors on the ultra-wideband light source based on the novel Bismuth-Erbium co-doped fiber,and optimize the ion concentration ratio in the Bismuth-Erbium co-doped fiber.A number of fibers with different ion doping concentrations were fabricated for horizontal comparison experiments.Finally,a high-brightness ultra-wideband light source covering the wavelength from 1400 to 1700 nm is obtained.The 5 d B bandwidth is 51 nm near the wavelength of 1550 nm,and the total output power of the fiber source can reach 1.95 milliwatt.In this paper,the bending stability and temperature stability of the ultra-wideband light source based on the novel Bismuth-Erbium co-doped fiber are also experimentally explored.The ultra-wideband fiber light source obtained in this paper has little effect on the output when the fiber bending diameter is greater than 30 mm,and still has a large output power when the bending diameter is 15 mm,which can basically meet the requirements of miniaturized device packaging.By optimizing the fiber length and fiber ion doping concentration,the fiber source can have a good temperature stability of 0.0163 d B / °C in the temperature range of-45 ～ 145 °C.Finally,an ultra-wideband fiber source with high brightness,large bandwidth,good flatness,good bending and temperature stability is obtained.