Free-space optical communication device
A space communication and optical signal technology, applied in the direction of free space transmission, short-distance systems, electrical components, etc.
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Embodiment 1
[0032] FIG. 1 is a block diagram showing Embodiment 1 of the optical space communication device of the present invention. The optical space communication device 11 of this embodiment includes a light receiving element 12 and a signal selection unit 13 . The light-receiving element 12 receives the communication signal L0, and photoelectrically converts the communication signal L0, which is the light-receiving signal, into an electrical signal S0. The communication signal L0 includes two kinds of infrared light signals L1 and L2 representing different information.
[0033] The infrared optical signals L1 and L2 are, for example, audio signals or music signals, and are optical signals pulse-width-modulated or pulse-density-modulated based on different pieces of information. Then, these infrared light signals L1 and L2 are time-divisionally synthesized to form a communication signal L0. Accordingly, the communication signal L0 includes infrared light signals L1 and L2 representi...
Embodiment 2
[0043] Fig. 3 is a block diagram showing Embodiment 2 of the optical space communication device of the present invention. The optical space communication device 21 of this embodiment includes a light receiving element 22 and a signal selection unit 23 . The light-receiving element 22 receives two kinds of infrared light signals L1 and L2 respectively representing different information, and photoelectrically converts these light-receiving signals, that is, the infrared light signals L1 and L2 into an electrical signal S0 . The signal selection unit 23 receives an electrical signal S0 from the light receiving element 22 , demodulates and separates the signal S1 and the signal S2 from the electrical signal S0 , and selectively outputs the signal S1 , the signal S2 , and the electrical signal S0 .
[0044] The illustrated signal selection unit 23 includes a signal switching unit 231 . Moreover, the signal switching unit 231 can select to output the signal S1 corresponding to the ...
Embodiment 3
[0049] Fig. 4 is a block diagram showing Embodiment 3 of the optical space communication device of the present invention. The optical space communication device 31 of this embodiment includes a light receiving element 32 and a signal selection unit 33 . The light-receiving element 32 receives two kinds of infrared light signals L1 and L2 respectively representing different information, and photoelectrically converts these light-receiving signals, that is, the infrared light signals L1 and L2 into an electrical signal S0 .
[0050] The signal selection unit 33 receives an electrical signal S0 from the light receiving element 32 , demodulates and separates the electrical signal S0 into a signal S1 and a signal S2 , and outputs the signal S1 , the signal S2 , and the electrical signal S0 .
[0051] The infrared optical signals L1 and L2 are optical signals subjected to pulse width modulation or pulse density modulation, and are transmitted respectively. Therefore, the modulation...
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Abstract
Description
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Application Information
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