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A challenge is to measure the impairments of few-mode fiber (FMF) for mode division multiplexing (MDM) system, so as to quantify the few-mode fiber and compensate the impairments, and thus improves the transmission performance of MDM system. In this paper, the experimental setup of impairments measurement with the structure of Photonic Lantern and optical circulators is established. Not only the two...
We get the sailing opportunities of YW 21 and YW22 ships, and carry out the marine atmospheric laser communication channel test and terminal verification experiment. We develop the experimental equipment including marine atmospheric laser communication terminal and the atmospheric parameter measuring equipment. The stability and tracking data of the communication terminal are obtained, and the optical...
A system based on fiber spectrometer was designed to detect the concentration of various artificial pigments contained in the solution. Using this system, the absorbance curves of five kinds of artificial colors of lemon yellow, sunset yellow, carmine, bright blue and amaranth were measured, and the absorption coefficient of each pigment at different wavelengths was calculated. The reliability of...
We experimentally demonstrate a feedback-assisted 1.08 Gb/s orbital angular momentum (OAM)-based underwater-to-air wireless optical link with a floating mirror for beam steering. The experimental results show favorable performance of the proposed feedback scheme in the present of the change of water level.
In an infrared tracking measurement system, using inter-image subtraction and position detection method to achieve the goal of automatic capture, using centroid tracking, correlation tracking and edge tracking related goals of automatic tracking, the test of this method with good results in actual use, which provide technical reference for the development and use of infrared tracking measurement system.
In order to conveniently measure the concentration of artificial pigments in different solutions, a portable measurement system was developed based on miniature fiber optic spectrometer (MFOS). With this system, the absorbance curves and the absorption coefficients in the visible band for five kinds of artificial pigments in different solutions were measured and calculated. By measuring the concentration...
This paper presents an automatic optical non-contact measurement method to measure the groove depth, groove number and groove surface area ratio of grooved cigarette filter. After preprocessing of the image of grooved filter, Morphological open operation was used to eliminate false groove detection. Then the contours of outer boundary and grooves were found and the parameters of the filters were calculated...
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