In our work, the temperature sensing properties and intrinsic mechanism based on a bismuth–erbium co-doped optical fiber (BEDF) were explored. Through temperature sensing experiments, we found that when the 980-nm pump laser was used, the fluorescence intensity ratio (FIR) at 1560 and 1435 nm showed a good linear relationship at different temperatures and its sensitivity reached 0.1151 dB/°C, the accuracy was 0.2°C, and the R2 of the FIR curve is about 0.9923. At the same time, we also proposed a detection algorithm to judge the working state of the sensor. By changing the BEDF coating material while the fiber is being fabricated, the temperature measurement range can be further improved. The optical fiber temperature sensor will have a broader range of applications.
Ultra-wide spectrum light source plays an important role in large capacity fiber optic communication and fiber optic sensing. This paper designed an Er/Bi co-doped fiber, using a single-layer pumping structure on the performance of the designed fiber, which focuses on the pump power, fiber length on the performance of the output spectrum of Er/Bi codoped fiber. The experiment shows that doping formula of Erbium and Bismuth ions is beneficial to improve the intensity of L band emission line, which provides a basis for further revealing the intrinsic mechanism of Bismuth ions near infrared luminescence center. Finally, a high brightness ultra-wide spectrum light source of S+C+L band from 1450nm to 1700nm is obtained from the study of multi-parameter equalization method, in which 5dB bandwidth reached 105nm in the center of 1550nm wavelength, and the fluorescence intensity showed an upward trend after 1650nm wavelength. It can be seen that this light source will have a promising application prospect in the fields of large capacity optical fiber communication system and large capacity optical fiber sensing system.
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