International Business Machines Corporation

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Alessandro Cevrero

Thomas Helmut Toifl

Christian I Menolfi

Pier Andrea Francese

Thomas E Morf

Marcel A Kossel

Daniel Michael Kuchta

Marc Seifried

Yiyu L Chen

Mitch Gusat

A computer-implemented method of controlling communication resources and computation resources of a computerized system includes continually monitoring dual observables. The dual observables include one or more communication observables pertaining to one or more communication channels of the system, and one or more compute observables pertaining to a computational workload execution by a processor of the system. The method also includes jointly adjusting dual resources of the system based on the dual observables monitored, where the dual resources include communication resources for the one or more communication channels, and computation resources for the computational workload execution. Such a method can be used for sprinting both communication and computational resources, in a consistent way, for the system to best cope with temporary situations, in terms of both workload execution and data traffic. The invention is further directed to related systems and computer program products.

Joint control of communication and computation resources of a computerized system

A system and method for a high-speed transmitter comprising a precoder configured to receive a sequence of input symbols and to generate for each received symbol a respective recoded symbol is disclosed. The transmitter includes a recoding unit configured for recoding each current received PAM-M based on the recoded symbol immediately preceding the current recoded symbol at the recoding unit, a shift unit configured for determining a shift value for each current received symbol from the recoding unit based on the symbol received from the recoding unit and immediately preceding the current symbol at the shift unit; and Feed-Forward Equalizer unit for applying the shift values to the respective symbols received from the recoding unit to generate a corresponding sequence of output symbols to be transmitted in an output stream.

PAM-4 transmitter precoder for 1+0.5D PR channels

Devices and methods are provided to reduce the wake-up time of a Vertical Cavity Surface Emitting Laser (VCSEL) used in a data communication link. For example, in one aspect, a method for optical communications includes, in an optical communication device including a light-emitting device, applying a bias current to the light-emitting device and transmitting a pulse to the light-emitting device before transmitting a preamble signal or data signal to the light-emitting device, wherein the pulse has a voltage greater than a highest voltage of the preamble signal or data signal.

VCSEL based optical links in burst mode

Embodiments describe a transadmittance amplifier comprising an inverting output port and a non-inverting output port. The transadmittance amplifier comprising a first differential transistor pair having a first transistor comprising an inverting input port. The first transistor is configured to provide an output current to the inverting output port. A second transistor comprising a non-inverting input port. The second transistor is configured to provide an output current to the non-inverting output port. A second differential transistor pair having a third transistor comprising an inverting input port and a fourth transistor comprising a non-inverting input port. A first current source and a second current source. The transadmittance amplifier comprises a first current mirror which is configured to mirror an output current of the fourth transistor to the inverting output port and a second current mirror which is configured to mirror an output current of the third transistor to the non-inverting output port.

Transadmittance amplifier

Octagonal phase rotator apparatus is provided for producing an output signal that is phase dependent on a digital control code. The apparatus includes an I-mixer, a Q-mixer, and first and second IQ-mixers. The I-mixer is responsive to I-control bits of the digital control code. The Q-mixer is responsive to Q-control bits of the digital control code. The first and second IQ-mixers are respectively responsive to one or more IQ1-control bits and one or more IQ2-control bits of the digital control code. The I-mixer comprises an I-DAC for steering current between a positive phase IP and a negative phase IN of an in-phase (I) signal wherein the one or more I-control bits control switching of a first current unit between IP and IN, and a set of amplifiers for weighting the phases IP and IN, in dependence on current steered to each phase by the I-DAC, to produce a weighted I-signal.

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