Radiation-Resistant Er3+-Doped Superfluorescent Fiber Sources

Abstract

The radiation effects of three Er3+-doped superfluorescent fiber sources (SFSs), which are based on three segments of Er-doped fibers with different lengths, are studied experimentally. We observed that the radiation-induced attenuation of the signal light of the 1530 nm band for an SFS is less than that of the 1560 nm band. Thus, the trimming technique of the Gauss-like spectra is investigated to reduce the mean wavelength drift. A filter was customized and used in superfluorescent fiber sources. To further reduce output power loss, the method with feedback control of pump power was adopted in the SFS. Then, the trimming spectral SFS with pump feedback control was tested under irradiation environment at the dose rate of 2.988 Gy/h. The experimental results demonstrate that the mean wavelength drift is <40 ppm and the loss of output power is <0.2 dB under a total dose higher than 1000 Gy. These findings confirm the significance of the method in improving radiation-resistant capabilities of fiber sources under irradiation environments.

Improvement of the Temperature Stability of the Erbium-Doped Superfluorescent Fiber Source by Tuning the Reflectivity of the Fiber End

“…Furthermore, when the ASE passes through the highly-pumped region of the Er fiber (i.e., with a high population inversion), it is simply amplified through the gain given by the emission cross section, with a dominant peak around 1530 nm. On the other hand, the lowly-pumped region of the fiber causes filtering of the ASE by the absorption emission cross section, facilitating a rise and even a possible dominance of the 1560 nm peak [12], [36].…”

“…The diode was driven by a constant current of 100 mA producing a power of 42 mW at the input of the Er-doped fiber. To achieve a high power efficiency [5], [12], we employed 20 meters of weakly-doped fiber I-6 (Fibercore), which absorption and emission spectra are shown in the Fig. 1.…”

“…In a relation to FOGs, typical studied issues of the SFS include maximizing a spectrum width [7]- [9] and flatness [6], [7], [10], [11], minimizing a radiation sensitivity [12], [13], but majority of the studies are dedicated to minimizing a temperature sensitivity [3], [14]- [24]. As the measured angular velocity by the FOG is proportional to the Sagnac phase shift with a scale factor depending on the used wavelength, the SFS mean wavelength stability is the most critical parameter.…”

Experimental–Simulation Analysis of a Radiation Tolerant Erbium-Doped Fiber Amplifier for Space Applications

“…Moreover, thanks to the small size, low weight and low power consumption of REDFs, they are recently finding great use in the context of space missions and satellite communications to ensure free space high-speed data transfer. REDFAs and REDFSs are used as part of space optical communications terminals to enable long-range communications as well as in fiber optic gyroscopes [2][3][4][5][6][7][8].…”

Temperature Influence on the Radiation Responses of Erbium‐Doped Fiber Amplifiers

“…Indeed, these fibers are key elements of amplifiers or laser sources to be implemented in light detection and ranging (LIDAR) systems, inertial navigation systems, or to enhance the intersatellite and satellite–Earth optical communication links. [ 1–5 ] Space environment is associated to both radiations and temperature constraints to which spacecrafts have to survive. Usually, the considered temperature of those devices ranges from −40 to 80 °C but for some of the targeted future space missions, variations from −200 to 300 °C are expected at the satellite level and may lead to more severe constraints.…”