The traditional underwater laser communication system has less electro-optic conversion efficiency,
short lifetime, large volume, low reliability and complex communication systems. Meanwhile, Underwater
communication system with bandwidth above 1Mbps level is in urgent need. To solve these problems, a novel LED
optical communication system is present which based on full-duplex mode. In order to improve the communication
distance and reduce the influence of backscattering and reflection light, a novel method of blue light LED array placement
is proposed. A practical optical attenuation estimation algorithm based on different chlorophyll concentration is used to
evaluate the feasibility of 50m underwater communication link distance. The MATLAB numerical calculation are given.
The simulation results show that the design method of LED array light source proposed in this paper has small size, light
weight and simple structure, which can be applied to underwater optical communication in low channel attenuation, Mbps
level bandwidth and long distance(>50m).
Compared to coherent beam combining, incoherent beam combining can complete the output of high power laser beam with high efficiency, simple structure, low cost and high thermal damage resistance, and it is easy to realize in engineering. Higher target power is achieved by incoherent beam combination which using technology of multi-channel optical path correction. However, each channel forms a spot in the far field respectively, which cannot form higher laser power density with low overlap ratio of faculae. In order to improve the combat effectiveness of the system, it is necessary to overlap different faculae that improve the target energy density. Hence, a novel method for incoherent combining of far-field laser beams is present. The method compromises piezoelectric ceramic technology and evaluation algorithm of faculae coincidence degree which based on high precision multi-channel optical path correction. The results show that the faculae recognition algorithm is low-latency(less than 10ms), which can meet the needs of practical engineering. Furthermore, the real time focusing ability of far field faculae is improved which was beneficial to the engineering of high-energy laser weapon or other laser jamming systems.
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