Mitigating Noise and OBI in RFoG Networks
AssigneeARRIS Enterprises LLC
InventorsVenkatesh G. Mutalik, Marcel F. Schemmann
Life of this patent
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Abstract
A bi-directional optical transceiver includes multiple single mode optical ports and a multi-mode optical port. A multi-mode optical combiner combines single mode optical signals received at the single mode optical ports into a multi-mode optical signal at the multi-mode optical port. Each single mode optical signal has a distinct optical mode that does not interfere with the optical mode of the other single mode optical signals. A photo detector detects a total optical power of the plurality of single mode optical signals in the multi-mode optical signal. An amplifier is coupled to receive an output of the photo detector.
Claims3
A bi-directional optical transceiver, comprising:
- a plurality of single mode optical ports;
- a multi-mode optical port;
- a multi-mode optical combiner coupled to the plurality of optical ports and configured to combine a plurality of single mode optical signals received at the plurality of single mode optical ports into a multi-mode optical signal at the multi-mode optical port, each single mode optical signal having a distinct optical mode that does not interfere with the optical mode of the other single mode optical signals;
- a photo detector coupled to the multi-mode optical combiner and formed to detect a total optical power of the plurality of single node optical signals in the multi-mode optical signal;
- and
- an amplifier coupled to receive an output of the photo detector.
An optical receiver, comprising:
- a plurality of single mode optical ports;
- a multi-mode photo detector coupled to receive a plurality of single mode optical signals from each of the single mode optical ports, each single mode optical signal having a distinct optical mode that does not interfere with the optical mode of the other single mode optical signals, the optical combiner formed to detect a total optical power of the plurality of single mode optical signals;
- and
- the coupling of single mode optical ports and the photo detector arranged to image each of the plurality of single mode optical signals at a different beam angle from the others.
A radio frequency over glass (RFoG) communication system, comprising:
- a plurality of single mode optical fibers coupled between a digital content distribution headend and a regional distribution node;
- a plurality of multi-mode optical fibers between the regional distribution node and a plurality of customer sites, each multi-mode optical fiber less than half a length of any one of the single mode optical fibers;
- a plurality of multi-mode optical couplers, each formed and arranged to couple a plurality of single mode optical signals from the plurality of single mode optical fibers to one of the multi mode optical fibers, each single mode optical signal having a distinct optical mode that does not interfere with the optical mode of the other single mode optical signals;
- a photo detector coupled to each multi-mode optical fiber and formed to detect a total optical power of a multi mode signal from a multi-mode optical fiber it is coupled with;
- and
- an amplifier coupled to receive an output of each photo detector.
Dependencies are inferred from the claim text.