Optical data transfer
In an optical data transfer system, a beam modulator is configured to embed a set of data in an input beam. A multimode optical waveguide network has an in-coupling region for receiving the input beam. The multimode optical waveguide network is configured to guide the input beam to an out-coupling region of the multimode optical waveguide network. A spatial coherent detector is configured to measure a phase and an amplitude of an output optical field at multiple locations. The output optical field is at least partially defined by the input beam and thus exhibiting distortion effects caused by the passage of the beam through the multimode waveguide network. Signal processing is applied to an output of the spatial coherent detector, in order to compensate for the distortion effects, and thereby recover, from the output of the spatial coherent detector, the set of data embedded in the input beam.
1. An optical data transfer system comprising:
a beam modulator configured to embed data in an input beam;
an input waveguide network, formed of a multimode optical waveguide, the input waveguide network having an in-coupling region, the input waveguide network configured to guide the input beam to an out-coupling region of the input waveguide network;
a spatial coherent detector configured to measure a phase and an amplitude of an output optical field at multiple locations, the output optical field being at least partially defined by the input beam and thus exhibiting distortion effects caused, at least in part, by passage of the input beam through the input waveguide network; and
a processor coupled to the spatial coherent detector and structured to compensate for the distortion effects using signal processing applied to an output of the spatial coherent detector, and thereby recover, from the output of the spatial coherent detector, the data embedded in the input beam, wherein the processor is structured to apply the signal processing in dependence on a channel selection associated with the output optical field.
2. The optical data transfer system of claim 1 , wherein the processor is structured to select, from multiple channel models corresponding to different channel selections, a channel model corresponding to the associated channel selection, and apply said signal processing in dependence on the selected channel model.
3. The optical data transfer system of claim 1 , wherein the processor is structured to select, from multiple channel models corresponding to different channel selections, a channel model corresponding to the associated channel selection, and apply said signal processing in dependence on the selected channel model, wherein each channel model comprises signal processing parameters learned for the corresponding channel selection.
4. The optical data transfer system of claim 1 , comprising a holographic recording region, the input waveguide network configured to guide the input beam to the holographic recording region to store the embedded data in a pattern recorded within that region via interference between the input beam and a reference beam, the output optical field created via interaction between the recorded pattern and a reference beam at a later time to read the embedded data from that holographic recording region.
5. The optical data transfer system of claim 1 , comprising a holographic recording region, at least one of the input waveguide network or a reference waveguide network configured to guide a reference beam to the holographic recording region.
6. The optical data transfer system of claim 1 , configured to guide, to the spatial coherent detector, an output beam at least partially defined by the input beam, via one of: the input waveguide network, a reference waveguide network formed of a further multimode optical waveguide, and an output waveguide network formed of a further multimode optical waveguide, wherein the passage of the output beam through at least one of the input, reference, or output waveguide network also contributes to said distortion effects compensated for by the signal processing.
7. The optical data transfer system of claim 1 , wherein at least one of the input waveguide network, a reference waveguide network, or an output waveguide network comprises a guiding element which is responsive to a beam characteristic.
8. The optical data transfer system of claim 1 , wherein compensating for the distortion effects comprises compensating for distortion effects caused by passage of a reference beam through at least one of a reference waveguide network formed of a further multimode optical waveguide or an input waveguide network.
9. An optical data transfer system comprising:
a beam modulator configured to embed data in an input beam;
a spatial coherent detector configured to measure a phase and an amplitude of an optical field of an output beam at multiple locations, the output beam being at least partially defined by the input beam;
an output waveguide network, formed of a multimode optical waveguide, the output waveguide network having an in-coupling region, and being configured to guide the output beam to an out-coupling region of the output waveguide network for receiving at the spatial coherent detector; and
a processor coupled to the spatial coherent detector and structured to compensate, using signal processing applied to an output of the spatial coherent detector, for distortion effects caused, at least in part, by passage of the output beam through the output waveguide network, and thereby recover, from the output of the spatial coherent detector, the data embedded in the input beam, wherein the processor is structured to apply the signal processing in dependence on a holographic recording region being read from.
10. The optical data transfer system of claim 9 , wherein the holographic recording region comprises holographic recording regions, the output waveguide network having a guiding element, which is responsive to a beam characteristic, wherein each of the holographic recording regions is selected to be read from, using the same spatial coherent detector, by at least one of re-configuring the guiding element or modulating the beam characteristic to guide an output beam from a selected holographic recording region to the spatial coherent detector.
11. The optical data transfer system of claim 9 , wherein the holographic recording region is associated with a channel model, and the processor is structured to apply said signal processing using the channel model associated with the holographic recording region being read from.
12. The optical data transfer system of claim 9 , wherein the holographic recording region has a logical address, and a channel model is selected based on a logical address associated with a current read operation and identifying the holographic recording region being read from.
13. The optical data transfer system of claim 9 , wherein the holographic recording region comprises holographic recording regions, at least one of the output waveguide network or a reference waveguide network formed of a further multimode optical waveguide being configured to guide a reference beam to a selected one of the holographic recording regions, wherein passage of the reference beam through at least one of the output or reference waveguide network contributes to said distortion effects compensated for by the signal processing.
14. The optical data transfer system of claim 9 , wherein the holographic recording region comprises holographic recording regions, at least one of the output waveguide network or an input waveguide network formed of a further multimode optical waveguide being configured to guide the input beam to a selected one of the holographic recording regions, wherein passage of the input beam through at least one of the output or input waveguide network contributes to said distortion effects compensated for by the signal processing.
15. An optical data transfer system comprising:
a beam modulator configured to embed data in an input beam;
a spatial coherent detector configured to measure a phase and an amplitude of an output optical field at multiple locations, the output optical field being at least partially defined by the input beam;
a waveguide network, formed of a multimode optical waveguide, the waveguide network having an in-coupling region, and being configured to guide at least one of an output beam or a reference beam to an out-coupling region of the waveguide network; and
a processor coupled to the spatial coherent detector and structured to compensate, using signal processing applied to an output of the spatial coherent detector, for distortion effects caused, at least in part, by passage of at least one of the output beam or the reference beam through the waveguide network, and thereby recover, from the output of the spatial coherent detector, the data embedded in the input beam.
16. The optical data transfer system of claim 15 , wherein the processor is structured to apply the signal processing in dependence on a channel selection associated with the output optical field.
17. The optical data transfer system of claim 15 , wherein the processor is structured to apply the signal processing in dependence on a holographic recording region being read from.
18. The optical data transfer system of claim 15 , wherein the processor is structured to select, from multiple channel models corresponding to different channel selections associated with the output optical field, a channel model corresponding to a channel selection, and apply said signal processing in dependence on the selected channel model.
19. The optical data transfer system of claim 15 , wherein the processor is structured to select, from multiple channel models corresponding to different channel selections associated with the output optical field, a channel model corresponding to a channel selection, and apply said signal processing in dependence on the selected channel model, wherein each channel model comprises signal processing parameters learned for the corresponding channel selection.
20. The optical data transfer system of claim 15 , wherein the processor is structured to apply the signal processing in dependence on a holographic recording region being read from, wherein the holographic recording region is associated with a channel model, and the processor is structured to apply said signal processing using the channel model associated with the holographic recording region being read from.