Eye-safe optical-wireless communication
AssigneeFraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
InventorsRené Kirrbach, Tobias Schneider
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Abstract
A communication node for optical-wireless communication in an optical-wireless communication network has: an input interface configured to receive a data signal, an optical transmitter configured to convert the data signal into an optical signal having an optical power, separation optics configured to spatially divide the optical signal into a plurality of optical partial signals having an associated spectral range to divide the optical power onto the plurality of optical partial signals, wherein the plurality of spectral ranges at least partially match. The communication node is configured to emit the plurality of optical partial signals for optical-wireless communication.
Claims21
A communication node configured for optical-wireless communication in an optical wireless communication network, comprising:
- an input interface configured to receive a data signal;
- an optical transmitter configured to convert the data signal into an optical signal comprising an optical power;
- separation optics element configured to spatially divide the optical signal into a plurality of optical partial signals comprising an associated spectral range to divide the optical power onto the plurality of optical partial signals, the plurality of spectral ranges at least partially coinciding;
- wherein the communication node is configured to provide the plurality of optical partial signals for the optical-wireless communication;
- wherein the plurality of optical partial signals collectively form an overall field of view or illumination area and, as being a plurality of optical partial signals are focused at spatially disjoint locations of an image plane when focused together, when using receiver-side optics or when focusing at or in the human eye.
A method of providing a separation optics element for an optical-wireless communication node comprising a plurality of optically active surfaces, the following being performed for each of the optically active surfaces:
- projecting an inhomogeneous radiation power of an optical emitter onto a projection region by defining a plurality of sub-regions of the projection region such that partial radiation powers of the radiation power incident on the sub-regions are equal within a tolerance range in the plurality of sub-regions;
- defining input angles of radiation power onto the optically active surfaces of the separation optics element and associating a respective output angle each to the plurality of partial radiation powers from the separation optics element, the output angles being derived from the sub-region of the projection region;
- defining the plurality of sub-regions for the optically active surfaces of the separation optics element such that, when the radiation power arrives, the separation optics element transforms the radiation power with the plurality of sub-regions into a partial radiation power for the projection area associated with a respective sub-region to obtain, from an optical signal impinging the separation optics element, a plurality of partial signals that collectively form an overall field of view or illumination area and, as being a plurality of optical partial signals are focused at spatially disjoint locations of an image plane when focused together, when using receiver-side optics or when focusing at or in the human eye;
- and
- manufacturing the separation optics element comprising the plurality of optically active surfaces.
Dependencies are inferred from the claim text.