Compensating for end-to-end group delay ripples
AssigneeVerizon Patent and Licensing Inc.
InventorsTiejun J. Xia, Glenn A. Wellbrock
Life of this patent
Estimating the term…
Abstract
A device may include a group delay monitor and a signal receiver. The group delay monitor may be configured to obtain group delay data corresponding to group delay of an optical signal and provide the group delay data to a signal receiver. The signal receiver configured to obtain a time-domain digital signal corresponding to the optical signal, convert the time-domain digital signal into a frequency-domain signal, apply a digital filter constructed based on the group delay data to the frequency-domain signal to obtain an output signal, and transmit the output signal.
Claims20
A method comprising:
- receiving, at different signal receivers of a device, an optical signal included in network traffic carried via different channels and destined for a client device;
- performing, by the device, in-service measurement of first values of original group delay ripples exhibited over select channels of the different channels of the optical signal without impacting the network traffic;
- determining, by the device, second values of compensating group delay ripples associated with each of the select channels, based on the in-service measurement of the first values;
- generating, based on the second values, the compensating group delay ripples associated with each of the select channels;
- injecting, by the different signal receivers of the device, the compensating group delay ripples into a digital signal, corresponding to the optical signal, to generate an output signal in which the original group delay ripples and the compensating group delay ripples sum to zero;
- and
- transmitting, from the device, the output signal from the device to the client device.
A device comprising:
- a group delay monitor configured to:
- obtain group delay data corresponding to group delay of an optical signal, included in network traffic destined for a client device, without impacting the network traffic;
- provide the group delay data to a signal receiver;
- and
- the signal receiver configured to:
- determine, based on the group delay data, that the group delay of the optical signal corresponds to accumulated group delay ripples;
- obtain a time-domain digital signal corresponding to the optical signal;
- convert the time-domain digital signal, within a time window, into a frequency-domain signal;
- apply a digital filter, constructed based on the group delay data to compensate for the accumulated group delay ripples, to the frequency-domain signal to obtain an output signal in which the accumulated group delay ripples have been removed;
- and
- transmit the output signal to the client device.
A device comprising:
- a plurality of signal receivers, each of the signal receivers configured to:
- obtain, without impacting network traffic destined for a client device, group delay data corresponding to group delay of optical signals, included in the network traffic, input to the signal receivers;
- determine, based on the group delay data, that the group delay corresponds to group delay ripples exhibited in the optical signal;
- configure a digital filter, based on the group delay data, to compensate for the group delay ripples;
- obtain a time-domain digital signal from the optical signal;
- convert the time-domain digital signal into a frequency domain signal;
- apply the digital filter to the frequency domain signal to obtain an output signal in which the group delay ripples have been removed;
- and
- transmit the output signal to the client device.
Dependencies are inferred from the claim text.