| Summary: | This study proposes and experimentally validates a high-power, narrow-spectrum amplified spontaneous emission (ASE) source that effectively suppresses random lasing while maintaining a narrow band. By incorporating filtering technology, the spectral width of the ASE source is compressed from several tens of nanometers to 0.3 nm. The relationship among random lasing, pump power, and erbium-doped fiber (EDF) length is systematically investigated. It is demonstrated that shortening the EDF length effectively inhibits lasing, while a two-stage amplification structure achieves an output power of up to 10 mW. The resulting narrow-spectrum ASE source exhibits a coherence length of approximately 7 mm, as measured by the fiber delay line method, demonstrating strong potential for high-dynamic-range fiber optic sensing applications, particularly in fiber optic hydrophones.
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