Diverging Beam Optical Communication System
First Claim
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1. An optical wireless communication devices comprising:
- a first optical receiver having a photo-detector with a first field of view and for receiving first data from a first remote source;
a second optical receiver having a photo-detector with a second field of view and for receiving second data from a second remote source, whereby the second field of view is out of line with the first field of view; and
a processing circuit coupled to the first and to the second optical receivers such that each remote source has an optical transmitter generating a diverging beam of light, and means to expand or contract the beam to both modify the signal strength as a ratio to distance and to assist in physically aligning and focusing one of said optical receivers without substantially deflecting the beam of light.
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Abstract
The invention refers to a diverging beam wireless network node including multiple bidirectional point-to-point links, which align between a central hub and dispersed clients. Assuming that the hub is limited in size, the receivers may be in close proximity to one another. In this case, the optical signal from two or more clients, which may have spread significantly in diameter due to angular spread in the transmitted light, may overlap spatially at the hub, causing interference and difficulty in separating the data. The invention solves the problems caused by such interference and permits communication links with low error rate.
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16 Claims
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1. An optical wireless communication devices comprising:
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a first optical receiver having a photo-detector with a first field of view and for receiving first data from a first remote source; a second optical receiver having a photo-detector with a second field of view and for receiving second data from a second remote source, whereby the second field of view is out of line with the first field of view; and a processing circuit coupled to the first and to the second optical receivers such that each remote source has an optical transmitter generating a diverging beam of light, and means to expand or contract the beam to both modify the signal strength as a ratio to distance and to assist in physically aligning and focusing one of said optical receivers without substantially deflecting the beam of light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of communicating with a optical wireless signal, comprising:
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receiving a first optical wireless signal at a first angle from a first remote source; receiving a second optical wireless signal at a second angle that is different than the first angle from a second remote source; and distinguishing between the first optical wireless signal and the second optical wireless signal. - View Dependent Claims (15, 16)
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Specification