Ultra-wide emission in bismuth doped optical fiber has been extremely studied for the development of the laser and amplifier working at near infrared band. In our homemade bismuth/erbium co-doped optical fiber, bismuth active center associated with silica (BAC-Si) has been found that when pumping at its resonant wavelength at 830 nm the NIR emission could be partially bleached. In addition, a self-recovery process has been observed at room temperature. However, the exact mechanism is still unclear. In this work, we have investigated the photo-bleaching effect on the BAC-Si via the pump power, pump wavelength and temperature dependence. Based on analyzing the result using stretched exponential function, it shows that the bleaching effect on BAC-Si has a strong link with the excitation process of Bi ion in BAC-Si. A potential energy curve model is used to illustrate the BAC-Si photo-bleaching process.
A novel discriminative strain and temperature measurement is demonstrated using Brillouin scattering and fluorescence in an erbium-doped fiber (EDF). The fluorescence intensity ratio, calculated using the fluorescence intensities (or powers) at 1530 nm and at 1565 nm, is linearly dependent on temperature with a proportionality constant of 7.5 × 10–4/°C, but is not influenced by strain. By combining the strain- and temperature-dependences of Brillouin frequency shift in EDFs, the applied strain of 0.4% and the temperature of 20.0°C were successfully discriminated with measurement errors of 0.03% and 0.6°C, respectively.
Enhancement of Brillouin scattering signal attenuating along optical fiber due to the inherent propagation loss can extend the sensing range or increase the sensing resolution of Brillouin distributed fiber-optic sensing. In this paper, we demonstrate a scheme to investigate the amplification effect of 980-nm pump on Brillouin gain spectrum in an erbiumdoped optical fiber (EDF). The Brillouin Stokes power is exponentially raised with increasing the pump power, indicating that adjusting the pump power can control the Brillouin signal in an EDF. We also show that drastic enhancement of Brillouin signal should be possible by using a high-power 980-nm pump laser.
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