The simplest model for a description of the random distributed feedback (RDFB) Raman fiber laser is a power balance model describing the evolution of the intensities of the waves over the fiber length. The model predicts well the power performances of the RDFB fiber laser including the generation threshold, the output power and pump and generation wave intensity distributions along the fiber. In the present work, we extend the power balance model and modify equations in such a way that they describe now frequency dependent spectral power density instead of integral over the spectrum intensities. We calculate the generation spectrum by using the depleted pump wave longitudinal distribution derived from the conventional power balance model. We found the spectral balance model to be sufficient to account for the spectral narrowing in the RDFB laser above the threshold of the generation.
|Title of host publication||Laser sources and applications II|
|Editors||Jacob I. Mackenzie, Helena JelÍnková, Takunori Taira, Marwan Abdou Ahmed|
|Number of pages||7|
|Publication status||Published - 2014|
|Event||Laser sources and applications II - Brussels, Belgium|
Duration: 14 Apr 2014 → 17 Apr 2014
|Conference||Laser sources and applications II|
|Period||14/04/14 → 17/04/14|
Bibliographical noteIlya D. Vatnik and Dmitry V. Churkin. "Modeling of the spectrum in a random distributed feedback fiber laser within the power balance modes ", Proc. SPIE 9135, Laser Sources and Applications II, 91351Z (May 1, 2014).
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- balance model
- Raman laser
- random laser
- Rayleigh backscattering