Abstract
The relative intensity noise (RIN) and relaxation oscillation characteristics of distributed-feedback fiber lasers (DFB-FLs) have been investigated theoretically and experimentally. The effects of Er3+ doping concentration and phase-shift grating parameters such as the coupling coefficient on the RIN and relaxation oscillation characteristics of DFB-FLs are presented by an analytical model. Also, four DFB-FLs with dissimilar coupling coefficients are fabricated and tested to confirm the theoretical results. In addition, the influence of the external environment and the contribution of the pump power fluctuations are analyzed in detail by experiments.
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