Low Absorption Erbium-Doped Fiber for High Performance ASE sources

The amplified spontaneous emission (ASE) source is widely adopted in Fiber Optic Gyroscopes (FOGs) due to its high mean wavelength stability with low temporal coherence. However, the majority of current studies are based on the entire broad ASE spectrum. In practical applications, high-precision ASE sources are often employed after filtering. This study systematically compares the temperature-dependent characteristics of erbium-doped fibers (EDFs) with low and high Er3+ doping concentrations in a bidirectional forward optical path configuration of an ASE source. The optimized low-concentration Er3+-doped EDF was integrated into a filtered ASE source. Experimental results show it achieved a power conversion efficiency of 26.9 % and exhibited a temperature coefficient of 0.107 ppm/°C. Its performance exceeds that of the commercially standard EDF. This study provides important experimental evidence for optimizing ASE sources.