Fade and surge asymmetry of direct single-mode-fiber coupled free-space optical signal under weak atmospheric turbulences

2012 ◽  
Author(s):  
Yoshinori Arimoto
Keyword(s):  
Free Space ◽  
Single Mode ◽  
Optical Signal ◽  
Single Mode Fiber ◽  
Free Space Optical

Free-space to single-mode fiber coupling efficiency with optical system aberration and fiber positioning error under atmospheric turbulence

2021 ◽  
Author(s):  
Yiming Bian ◽  
Yan Li ◽  
Erhu Chen ◽  
Wei Li ◽  
Xiaobin Hong ◽  
...  
Keyword(s):  
Atmospheric Turbulence ◽  
Optical System ◽  
Free Space ◽  
Fiber Optic ◽  
Coupling Efficiency ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Positioning Error ◽  
Free Space Optical ◽  
Statistical Expectation

Abstract Benefiting from the rapid development of fiber-optic devices, high-speed free-space optical communication systems have recently used fiber-optic components. The received laser beam in such a system couples into single-mode fiber (SMF) at the input of the receiver module. This work is oriented to common problems in actual free-space optical coupling systems, such as atmospheric turbulence, optical system aberration, and fiber positioning error. We derive the statistical expectation models of SMF coupling efficiency with optical system aberration in the presence of atmospheric turbulence and the statistical expectation models of SMF coupling efficiency with fiber positioning error in the presence of atmospheric turbulence. The influences of optical system aberration and fiber positioning error on the coupling efficiency under different turbulence strengths are also analyzed in this paper.

Taper Device for Tolerant Coupling of Free-Space Optical Beams Into Single-Mode Fiber

2014 ◽  
Vol 26 (18) ◽  
pp. 1843-1846 ◽  
Author(s):  
Carl M. Weinert ◽  
Stephan Hiegemann ◽  
Nicolas Perlot ◽  
Michael Rohde ◽  
Denny Hoh ◽  
...  
Keyword(s):  
Free Space ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Free Space Optical ◽  
Optical Beams

Switchable and tunable linear cavity erbium-doped fiber laser based on FBGs embedded in Sagnac rings

Laser Physics ◽  
2021 ◽  
Vol 32 (1) ◽  
pp. 015101
Author(s):  
Gangxiao Yan ◽  
Weihua Zhang ◽  
Peng Li ◽  
Qiuhao Jiang ◽  
Meng Wu ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Low Cost ◽  
Single Mode ◽  
Optical Signal ◽  
Single Mode Fiber ◽  
Hole Burning ◽  
Linear Cavity ◽  
Erbium Doped ◽  
Optical Fiber Sensing ◽  
Birefringence Effect

Abstract A switchable and tunable erbium-doped fiber laser with a linear cavity based on fiber Bragg gratings embedded in Sagnac rings is proposed and experimentally verified. Due to the stress birefringence effect and the polarized hole burning effect, which are introduced into the single-mode fiber in the polarization controllers (PCs) by the PCs, the designed laser can achieve seven kinds of laser-states output including three kinds of single-wavelength laser states, three kinds of dual-wavelength laser states and one kind of triple-wavelength laser state. The optical signal-to-noise ratios of the output wavelengths are all higher than 52 dB, and the wavelength shifts are all less than 0.04 nm. Furthermore, the temperature tuning of the wavelength range is also researched, which is about 1.2 nm. Due to advantages, such as low cost, simple structure, easy switching and multiple laser states, the designed laser has great application potential in laser radar, optical fiber sensing and so on.

scholarly journals Microdrilled tapers to enhance optical fiber lasers for sensing

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
R. A. Perez-Herrera ◽  
M. Bravo ◽  
P. Roldan-Varona ◽  
D. Leandro ◽  
L. Rodriguez-Cobo ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Fiber Lasers ◽  
Signal To Noise Ratio ◽  
Power Level ◽  
Single Mode ◽  
Optical Signal ◽  
Single Mode Fiber ◽  
Output Power Level ◽  
Linear Cavity

AbstractIn this work, an experimental analysis of the performance of different types of quasi-randomly distributed reflectors inscribed into a single-mode fiber as a sensing mirror is presented. These artificially-controlled backscattering fiber reflectors are used in short linear cavity fiber lasers. In particular, laser emission and sensor application features are analyzed when employing optical tapered fibers, micro-drilled optical fibers and 50 μm-waist or 100 μm-waist micro-drilled tapered fibers (MDTF). Single-wavelength laser with an output power level of about 8.2 dBm and an optical signal-to-noise ratio of 45 dB were measured when employing a 50 μm-waist micro-drilled tapered optical fiber. The achieved temperature sensitivities were similar to those of FBGs; however, the strain sensitivity improved more than one order of magnitude in comparison with FBG sensors, attaining slope sensitivities as good as 18.1 pm/με when using a 50 μm-waist MDTF as distributed reflector.

Laser injecting method from free space beam to single-mode fiber using single lens

2014 ◽  
Vol 26 (3) ◽  
pp. 31006
Author(s):  
张世强 Zhang Shiqiang ◽  
张政 Zhang Zheng ◽  
蔡雷 Cai Lei ◽  
瞿谱波 Qu Pubo ◽  
贺敏波 He Minbo
Keyword(s):  
Free Space ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Single Lens
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