Propagation characteristics of 2.07 μm fiber laser in weak turbulence condition

Lin Peng; Wang Tianshu; Ma Wanzhuo; Chen Junda; Jiang Huilin

doi:10.12086/oee.2020.190588

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Lin P, Wang T S, Ma W Z, et al. Propagation characteristics of 2.07 μm fiber laser in weak turbulence condition[J]. Opto-Electron Eng, 2020, 47(3): 190588. doi: 10.12086/oee.2020.190588

Citation:

Lin P, Wang T S, Ma W Z, et al. Propagation characteristics of 2.07 μm fiber laser in weak turbulence condition[J]. Opto-Electron Eng, 2020, 47(3): 190588. doi: 10.12086/oee.2020.190588

Propagation characteristics of 2.07 μm fiber laser in weak turbulence condition

1.
National and Local Joint Engineering Research Center of Space Optoelectronics Technology, Changchun University of Science and Technology, Changchun, Jilin 130022, China
2.
College of Opto-Electronic Engineering, Changchun University of Science and Technology, Changchun, Jilin 130022, China

Fund Project: Supported by National Natural Science Foundation of China (61975021)

More Information

Corresponding author: Wang Tianshu, E-mail：wangts@cust.edu.cn

Received Date 29 September 2019

Revised Date 29 November 2019

Published Date 01 March 2020

Abstract

Abstract

We demonstrate an actively mode-locked holmium-doped fiber laser with a central wavelength of 2.07 μm, and the propagation characteristics under weak turbulent condition are analyzed. A segment of 1.5 m holmium-doped fiber is used as gain medium. Actively mode-locked can be realized by introducing periodic intensity modulation into cavity through LiNbO₃ intensity modulator. The nonlinear polarization rotation effect is introduced into the cavity to realize the tunable wavelength of 2058.4 nm~2078.6 nm. Stable mode-locked pulses with fundamental frequency and 10^th, 24^th, 48^th order harmonic operations can be obtained. The signal to noise ratio (SNR) of the corresponding radio frequency (RF) spectrum is 66.79 dB, 61.37 dB, 54.82 dB and 49.66 dB. The stable mode-locked pulse modulated by digital signal and is transmitted in a simulated atmospheric turbulence device. The eye patterns can be obtained at the condition of ΔT=70 ℃, 140 ℃, 210 ℃ and back-to-back (BTB). The SNR at ΔT=210 ℃ decreased 9.14 dB compared with BTB condition.
- fiber laser /
- actively mode-locked /
- free-space optical communication /
- atmospheric turbulence

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References

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Overview

Overview

Overview: In recent years, 2 μm band fiber laser has attracted widespread attention with the advent of thulium-doped fiber and holmium-doped fiber because of its wide application in laser medicine, material processing and Lidar. In addition, the 2 μm laser works in atmospheric window, which lays the potential for free-space optical communication. However, the absorption peaks of many common gas molecules gather at 2 μm, such as H₂O and CO₂. The holmium-doped fiber can radiate laser with wavelength greater than 2 μm, which is more suitable as a gain fiber for optical communication laser source than thulium-doped fiber. There are several researches on holmium-doped fiber laser. In recent years, researchers have published a lot of research on the generation of high repetition frequency mode-locked pulse in 2 μm band. In 2017, Qin et al reported an actively mode-locked picosecond (ps) pulsed laser source with the repetition rate of 1 GHz~6 GHz, the pulse width is 60 ps, and the central wavelength is 1958.5 nm. In 2018, Zeng et al realized the repetition rate of 1.25 GHz, the pulse width is 426 fs with a central wavelength of 1941 nm. However, the study of wavelength greater than 2 μm mainly focuses on the generation of femtosecond pulse with high energy and narrow pulse width. In 2016, Sergei et al reported a passively mode-locked holmium-doped fiber laser based on nonlinear polarization rotation, the central wavelength is 2.9 μm, the pulse energy is 7.6 nJ, and a repetition rate of 43.1 MHz. In 2018, Maria et al built a dispersion-managed holmium-doped fiber laser with a graphene saturable absorber, the relationship between the spectrum of the mode-locked pulse and the total dispersion of the resonant cavity was studied, the output pulse width is 190 fs with a repetition rate of 21 MHz. It can be seen that the reports on mode-locked fiber laser with high repetition rate are still insufficient, and the 2 μm fiber laser for free-space optical communication system has not been reported.

In this paper, we demonstrated an actively mode-locked holmium-doped fiber laser, which can be used in free-space optical communication. By adding nonlinear polarization rotation effect in the cavity to filter out super-mode noise, the stability of mode-locked pulse was improved and the wavelength tunable can be realized. The wavelength tuning range is 2058.4 nm to 2078.6 nm, the repetition rate is 1.008 GHz and the corresponding radio frequency (RF) signal-to-noise ratio can reach 49.66 dB. Moreover, the mode-locked pulse sequence was modulated by the digital signal and transmitted under three different turbulent conditions. The optical signal-to-noise ratio of eye diagram after demodulation is 9.35 dB, 6.83 dB and 4.58 dB, respectively.