Effect of Color Center Absorption on Temperature Dependence of Radiation-Induced Attenuation in Optical Fibers at Near Infrared Wavelengths

Effects of color centers absorption on the spectrum of the temperature-dependent radiation-induced attenuation in fiber

“…As reported, the radiation-induced color centers can be coupled to the vibration lattice and their absorption spectrum bands are Gaussian band shape [7,12,13,16]. For the researched spectral range in this paper, the spectrum properties of temperature-dependent RIA in Ge and P codoped fibers are found to depend strongly on three kinds of color centers, namely, P1, Ge-NBOHC, and Ge(X) centers.…”

“…Peak positions (E n ), full width at halfmaximum (ω n ) are the main parameters of the color centers absorption bands. These two parameters of P1, Ge-NBOHC, and Ge(X) centers which were obtained at room temperature are given in Table 1 [7,9,16]. The configurational coordinate model was used to analyze the spectrum properties of the color centers [12][13][14]17].…”

“…Every energy state contains several vibrational levels indicated by the variable n in [14]. According to [7], a large value of S, which is called the Huang-Rhys parameter, is more suitable for us to study the absorption spectra of color centers. The absorption bands of the color centers will become Gaussian-like for large value of S. When the system is at 0 K, electrons will occupy the n 0 vibrational level in the ground state.…”

“…Color centers absorption was found to be a main reason that induces the increase of attenuation in irradiated fibers [7,8]. A series of color centers have been discovered through special spectroscopic techniques, such as in situ absorption measurements, electron paramagnetic resonance, confocal microscopy, and absorption and luminescence on preform [9,10].…”

A Novel Temperature Sensor Based on Temperature-dependent Attenuation at 850nm of Irradiated Ge/P Co-doped Fiber

“…In [19], it has been mentioned that the color center absorption influencing the RIA at 1310 nm in the Ge/P co-doped fiber exhibits monotonic and remarkable temperature dependence. The temperature dependence of the color center absorption is proposed to explain the RIA behavior at the near infrared wavelengths according to the configurational coordinate model [20]. As the absorption bands of many radiation-induced defects are in the ultraviolet and visible ranges and can extend to the near infrared region, the RIA at shorter wavelength is supposed to be more sensitive to temperature.…”