Experimental observation for multi-mode dynamic output of fiber ring laser based on modulation condition

Tang Kai; Xiao Yanping; Liu Hai; Xia Zhengyi; Li Feng; Wang Cheng

doi:10.12086/oee.2018.180041

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Tang Kai, Xiao Yanping, Liu Hai, et al. Experimental observation for multi-mode dynamic output of fiber ring laser based on modulation condition[J]. Opto-Electronic Engineering, 2018, 45(10): 180041. doi: 10.12086/oee.2018.180041

Citation:

Tang Kai, Xiao Yanping, Liu Hai, et al. Experimental observation for multi-mode dynamic output of fiber ring laser based on modulation condition[J]. Opto-Electronic Engineering, 2018, 45(10): 180041. doi: 10.12086/oee.2018.180041

Experimental observation for multi-mode dynamic output of fiber ring laser based on modulation condition

Institute of Logistics Science and Engineering, Academy of Military Science, Beijing 100166, China

Fund Project: Supported by National Natural Science Foundation for Youth Scientists of China (11404402)

More Information

Corresponding author: Xia Zhengyi, E-mail:zhy_xia@sohu.com

Received Date 23 January 2018

Revised Date 27 March 2018

Published Date 01 October 2018

Abstract

Abstract

In order to detect and analyze the complex multi-mode dynamics of fiber ring laser (FRL), in this experiment, based on the heterodyne detection method together with radio-frequency spectrum, the output of FRL intensities on two kinds of modulation condition are synchronously detected and analyzed. From the low dimension to high dimension chaos, the total intensity and multi-mode characters can be synchronously acquired. These experimental results show the relationships between real-time intensity and frequency evolution behaviors about single mode and total mode. Moreover, according to experimental results, the chaotic characteristics and inner relationships of erbium-doped fiber ring laser (EDFRL) output mode dynamic can be analyzed.
- fiber ring laser /
- multi-mode detection /
- chaotic characteristic analysis /
- frequency dynamic

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References

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Overview

Overview

Overview: Aiming at the phenomena of complex multimode dynamics occurring in practical applications of fiber ring laser (FRLs), this thesis has put forward an improved real-time multichannel frequency-domain monitoring method, which breaks up frequency-domain limitations of traditional measuring tools for laser dynamics. This breakthrough promotes the understanding and analysis on nonlinear dynamics of FRLs from a low dimension to higher, also revealing the complicated correlation between the individual behavior and the collective behavior of dense longitudinal modes and corresponding inherent physics.
The frequency-domain dynamics of laser is a hard problem in the field of optical complex systems. Actually, FRLs belong to a type of optical complex system with large degree of freedom, exhibiting such nonlinear mode dynamics as complex mode hopping, high-dimensional chaos. This thesis adopts erbium doped fiber ring laser (EDFRL) as the research object.
Based on both optical heterodyne and joint time-frequency analysis, a novel frequency-domain method for monitoring multimode dynamics of fiber lasers is proposed. This method has a frequency resolution of kHz-magnitude, and can be used to extract simultaneously the nonlinear time series of multi parameters, i.e., frequency and intensity for dense modes of EDFRL. Experimentally, the frequency-domain dynamics of modulated EDFRL is measured and analyzed, which reveals the complex interaction and evolutional law between the individual behavior and the clustering behavior of modes. The EDFRL with a FBG as wavelength selector is usually considered as a typical single-wavelength laser. However, hundreds of intrinsic modes coexist within the reflective band of FBG and present unsteady multi-longitudinal-mode (MLM) oscillations under autonomous conditions. With the help of optical heterodyne and joint time-frequency analysis method, the fruitful local dynamical phenomenon of the dense modes generated by this kind of EDFRLs are clearly obtained for the first time, which demonstrates that the individual mode shows a typical chaotic behavior whereas the total modes clustering behaves steadily.
A modulated chaotic EDFRL is a typically low-dimensional dynamical system, into which an additional freedom is introduced to realize chaos output. Similarly, this system contains a large number of dense longitudinal modes. Moreover, the dynamics and evolution of these modes in frequency domain are still unclear when the total output of the system is chaotic. By improving the frequency resolution of optical heterodyne and joint time-frequency analysis, the temporal evolution of the frequency, spectrum and intensity of a single mode in chaotic EDFRL are extracted respectively. It is found that when the total intensity exhibits low-dimensional chaos, the frequency modulation and spectral broadening phenomena occur for a single mode in frequency domain, and the mode intensity is characterized by high-dimensional chaos or random fluctuation.