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Turbulent environment can highly affect the performance of free space optical (FSO) communication links. Therefore, how to obtain the turbulence intensity is a very important issue. The paper has shown the detailed analysis to calculate the log irradiance variance (σ2R) along with the experimental verification under an indoor laboratory controlled turbulence condition. This paper verifies the consistency...
Based on the optical characteristics of the solid F-P etalon, the sensitivity to the angle and transmission is discussed. By slightly changing the angle of the incident light, the transmittance waveform of the etalon has a significant phase shift, and which become more and more rapidly with the increase of the angle. Through the stability analysis of transmission waveform in different regions, it...
We report an actively Q-switched fiber laser with cylindrical vector beam emission using a few-mode fiber Bragg grating as mode selection and acousto-optic modulator to achieve the ideal ns pulse. Both radially and azimuthally polarized beams have been obtained by tuning the polarization controllers. The generated Q-switched CVB operates at central wavelength of 1055.6 nm with a spectrum bandwidth...
The absolute distance measurement system based on phase shift and synthetic wavelength is developed. The repetition frequency of 250 MHz and corresponding forth harmonic frequency of a mode-locked erbium-doped fiber laser are used in measurement. The synthetic wavelength in introduced to enlarge the measuring ambiguity range of the system. Moreover, the repetition frequency is modulated by an acoustic...
We experimentally demonstrate visible-light co ding/de co ding utilizing hexadecimal vector beam array for parallel communication link. The hexadecimal base mode is investigated and 128-ary is also available. We present vector beam array carrying 4×6/6×8/12×16 hexadecimal numbers and error-free data stream transmission performance is also demonstrated.
Comparing with uncoated LPFGs, ZnO coated LPFG shows obvious improvement of RI sensitivity between the RI range of 1.4 and 1.62. The proposed structure exhibits a very high sensitivity of 5175 nm/RIU in the RI range from 1.444 to 1.448, and the sensitivity could be further improved by optimizing the thickness of the ZnO thin film.
We propose and demonstrate an all-fiber passively mode-locked laser with pulsed cylindrical vector beam output based on a mode selective coupler (MSC) in a figure-8 cavity, The MSC made of a two mode fiber and a standard single mode fiber is used as both the intracavity transverse mode converter and mode splitter. Through adjusting the polarization state in the laser cavity, both radially and azimuthally...
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