Abstract: An example system includes a first circuit board having first conductive traces, where a first conductive trace is for conducting an alternating current (AC) digital signal having an edge; a second circuit board having second conductive traces, where a second conductive trace is within a predefined distance of the first conductive trace to produce a contactless coupling with the first conductive trace, and where the contactless coupling enables electrical energy on the first conductive trace to manifest on the second conductive trace as a transient response that is based on the edge; and circuitry to reconstruct the edge based on the transient response from the second conductive trace.

Abstract: An example system includes a first circuit board having first conductive traces, where a first conductive trace is for conducting an alternating current (AC) digital signal having an edge; a second circuit board having second conductive traces, where a second conductive trace is within a predefined distance of the first conductive trace to produce a contactless coupling with the first conductive trace, and where the contactless coupling enables electrical energy on the first conductive trace to manifest on the second conductive trace as a transient response that is based on the edge; and circuitry to reconstruct the edge based on the transient response from the second conductive trace.

Abstract: An example test system includes a circuit to sample a signal that is repetitive in cycles to obtain data; a processor configured to generate an eye diagram based on the data, where the eye diagram represents parametric information about the signal; and a functional test circuit to receive the signal and to perform one or more functional tests on the signal. The test systems is configured to receive the signal from a unit under test and to allow the signal to pass to the functional test circuit inline without changing at least part of the signal.

Abstract: An example optical receiving device includes a photodiode to receive an optical signal, where the photodiode is configured to conduct a current that is based on an optical power of the optical signal, and a radio frequency (RF) gain circuitry to generate one or more analog electrical signals based on the current and based on gain provided by the RF gain circuitry. A power detector is configured to receive an analog electrical signal of the one or more analog electrical signals, to detect alternating current (AC) power of the optical signal based on the analog electrical signal, and to output a signal representing the AC power based on the detecting.

Abstract: An example optical receiving device includes a photodiode to receive an optical signal, where the photodiode is configured to conduct a current that is based on an optical power of the optical signal, and a radio frequency (RF) gain circuitry to generate one or more analog electrical signals based on the current and based on gain provided by the RF gain circuitry. A power detector is configured to receive an analog electrical signal of the one or more analog electrical signals, to detect alternating current (AC) power of the optical signal based on the analog electrical signal, and to output a signal representing the AC power based on the detecting.

Abstract: An example test system includes a circuit to sample a signal that is repetitive in cycles to obtain data; a processor configured to generate an eye diagram based on the data, where the eye diagram represents parametric information about the signal; and a functional test circuit to receive the signal and to perform one or more functional tests on the signal. The test systems is configured to receive the signal from a unit under test and to allow the signal to pass to the functional test circuit inline without changing at least part of the signal.