Patent application number | Description | Published |
20090052910 | Automatic dual receiver in a multi-wavelength fiber optic system - An optical-to-electrical converter may include and/or involve a splitter to separate one or more narrowcast signals from a broadcast signal, at least one broadcast signal receiver to receive the broadcast signal separated from one or more narrowcast signals, at least one narrowcast signal receiver to receive the narrowcast signal separated from the broadcast signal, the narrowcast receiver including an attenuator and a filter, and a controller including logic to dynamically monitor and adjust the attenuator to maintain separation between the broadcast and narrowcast signals. | 02-26-2009 |
20090237285 | DIGITAL TO ANALOG CONVERTER SPUR CANCELLATION - A device includes an upsampling digital-analog converter (DAC) and logic to add a DC offset to a signal input to the DAC, the logic adapted to set the DC signal to cancel a DAC output spur. | 09-24-2009 |
20090237767 | PREDISTORTION USING FPGA - Predistortion logic for an optical communications laser or optical modulator, includes predistortion logic embodied in a field programmable gate array (FPGA). A first analog to digital converter (ADC) provides a representation of an RF signal at an input of the FPGA. A digital to analog converter provides a representation of an output of the FPGA to a laser or modulator. | 09-24-2009 |
20090256655 | Anti-Parallel Pi Pin Attenuator Structure with Improved CSO Performance - An RF attenuator circuit includes an anti-parallel PI structure having an input shunt arm comprising a single PIN diode, and an output shunt arm comprising a single PIN diode configured to have opposite polarity of the PIN diode of the input shunt arm. | 10-15-2009 |
20090263141 | DUAL USE OF TEST POINT POWER MONITOR - A channel alignment system in an optical communication network includes logic to sample power of a quadrature amplitude modulation (QAM) channel at a component downstream from a QAM modulator. The system determines if the sampled channel power has a sufficient level. The system signals power control logic of the QAM modulator to adjust a gain of the sampled channel. | 10-22-2009 |
20120213515 | SERVICE GROUP AGGREGATION - Methods and systems for aggregating service groups are provided. A chain of fiber nodes in a DOCSIS system is formed to aggregate the service groups served by the fiber nodes to form a super-service group. Multiple channels of a multiplexed data stream are used to transmit the signals from the super-service group. By creating a chain of fiber nodes and using multiple channels to transmit the signals from the super-service group, a DOCSIS system can be more efficiently reconfigured to segment a super-service group once the system has become exhausted. | 08-23-2012 |
20130004173 | OVERLAY SYSTEM WITH DIGITAL OPTICAL TRANSMITTER FOR DIGITIZED NARROWCAST SIGNALS - Methods and apparatuses are provided to modify existing overlay system architectures in a cost effective manner to meet the growing demand for narrowcast services and to position the existing overlay systems for additional future modifications. The implementations of the improved overlay system of this disclosure re-digitize narrowcast analog signals after they have been QAM modulated and upconverted to RF frequencies and replace the analog narrowcast transmitters with digital narrowcast transmitters. In the fiber nodes, the received narrowcast signals are converted back to analog signals and combined with analog broadcast signals for transmission to the service groups. | 01-03-2013 |
20130071120 | DIGITIZER FOR USE IN AN OVERLAY SYSTEM WITH DIGITAL OPTICAL TRANSMITTER FOR DIGITIZED NARROWCAST SIGNALS - Methods and apparatuses are provided to digitize an analog multi-channel RF narrowcast signal in an overlay system by dividing the signal into a plurality of subband signals and digitizing each subband signal using practical A/D converters. | 03-21-2013 |
20150050025 | Digitized Broadcast Signals - Methods, systems, and computer-readable media can facilitate digitizing a broadcast transmission and transporting the digitized broadcast transmission along with one or more digitized narrowcast transmissions to a subscriber. In embodiments, a digitized broadcast transmission and one or more digitized narrowcast transmissions can be separately demodulated and the transmissions can be combined at one or more receiving nodes. In embodiments, a digitized broadcast transmission can be combined with one or more digitized narrowcast transmissions. Lossless compression and de-compression techniques can be used to optimally transport digitized broadcast and narrowcast signals. | 02-19-2015 |