Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: A method and structure for generation of signal distortion. In a first embodiment, a first signal distortion generator (SDG) receives a pair of balanced input currents +X and −X, each having a same angular frequency &ohgr;. The first SDG generates a pair of output currents +X+&Dgr;X1 and −X+&Dgr;X2, wherein &Dgr;X1−&Dgr;X2=G2X2+G3X3. G2 and G3 are each independent of X, and at least one of G2 and G3 is nonzero. In a second embodiment, a second SDG receives an unbalanced input current P having an angular frequency &ohgr;. The second SDG generates an output current UOUT of a form P+(&agr;P+&bgr;P2+&ggr;P3)/2. &agr;, &bgr;, and &ggr; are each nonzero and each independent of P. The second SDG includes a distortion generating circuit path that has an input impedance ratio of at least 5 and an output impedance ratio of at least 5.

Abstract: The present invention relates generally to an amplifier such as that with the radio frequency (RF) spectrum having a nonlinear feedback loop to cancel out distortions in the input signal, and method therefor.

Abstract: A method and structure for generation of signal distortion. In a first embodiment, a first signal distortion generator (SDG) receives a pair of balanced input currents +X and −X, each having a same angular frequency &ohgr;. The first SDG generates a pair of output currents +X+&Dgr;X1 and −X+&Dgr;X2, wherein &Dgr;X1−&Dgr;X2=G2X2+G3X3. G2 and G3 are each independent of X, and at least one of G2 and G3 is nonzero. In a second embodiment, a second SDG receives an unbalanced input current P having an angular frequency &ohgr;. The second SDG generates an output current UOUT of a form P+(&agr;P+&bgr;P2+&ggr;P3)/2. &agr;, &bgr;, and &ggr; are each nonzero and each independent of P. The second SDG includes a distortion generating circuit path that has an input impedance ratio of at least 5 and an output impedance ratio of at least 5.