Multiwavelength generation in a random distributed feedback fiber laser using an all fiber Lyot filter

Fiber Lasers and Glass Photonics: Materials Through Applications

Gorbunov

Sugavanam

et al. 2018

In present paper correlations between different parts of spectrum of a fiber laser with randomly distributed feedback (RDFL) were experimentally measured directly. Implemented statistical analysis demonstrate weak cross-correlations between different lines in generation spectrum. These correlations were vizualized by plotting 2-D probability density functions. Linear correlation coefficient (Pearson coefficient) was calculated for each pair of spectrum lines.

Section: Simultaneous Measurement Of Different Spectral Lines In Rdflmentioning

confidence: 99%

Revealing spectral cross-correlations in radiation of multiwavelength fiber laser with randomly distributed feedback

Fiber Lasers and Glass Photonics: Materials Through Applications

Gorbunov

Sugavanam

et al. 2018

“…Various aspects of RFL have been studied in recent years. RFL has demonstrated to be tunable [14], multi-wavelength [15][16][17][18], narrow bandwidth [19], cascaded operation to generate high order Stokes wave [20][21][22][23] and high output power [24,25].. However, up till now, there are still a lot of open questions regarding the physics of random lasing in fibers.…”

Section: Introductionmentioning

confidence: 99%

Random distributed feedback Raman fiber laser with polarized pumping

Churkin

et al. 2014

Laser Phys. Lett.

Abstract：In this paper, the polarization properties of random fiber laser operating via Raman gain and random distributed feedback owing to Rayleigh scattering is investigated for the first time. Using polarized pump, the partially polarized generation is obtained with a generation spectrum exhibiting descrete narrow spectral features contrary to the smooth spectrum observed for the unpolarized pump. The threshold, output power, degree of polarization (DOP) and the state of polarization (SOP) of the lasing can be significantly influenced by the SOP of the pump. Fine narrow spectral components are also sensitive to the SOP of the pump wave. Furthermore, we found that random lasing's longitudinal power distribution is different in the case of polarized and unpolarized pumpoing that results in considerable reduction of the generation slope efficiency for the polarized radiation. Our results indicates that polarization effects plays an important role in the performance of the random fiber laser. This work improves the understanding of the physics of random lasing in fibers and makes a step forward towards the establishment of the vector model of random fiber lasers.

“…Up to date, a number of different schemes of random DFB fiber lasers were demonstrated [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] . Namely, random DFB fiber lasers can operate in different spectral bands 12,13 , emit higher order Stokes waves [12][13][14] , be tunable 22,23 and multiwavelength 15,19,21 .…”

Section: Introductionmentioning

confidence: 99%

“…Namely, random DFB fiber lasers can operate in different spectral bands 12,13 , emit higher order Stokes waves [12][13][14] , be tunable 22,23 and multiwavelength 15,19,21 . The noise level of random DFB fiber lasers could be lower than of conventional lasers 27 making them attractive for telecom applications.…”

Section: Introductionmentioning

confidence: 99%

Modeling of the spectrum in a random distributed feedback fiber laser within the power balance modes

Churkin

2014

SPIE Proceedings

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.