Abstract: A transmitter including a digital-to-analog converter (DAC) to generate an analog output corresponding to a transmitted signal. The transmitter further includes an analog-to-digital converter (ADC) coupled to the DAC. The ADC measures the analog output of the DAC to identify a set of digital samples. The ADC identifies, from the set of digital samples, a set of valid samples, wherein each valid sample has a voltage within a voltage range. The ADC extracts one or more signal properties from the set of valid samples.

Abstract: A transmitter including a digital-to-analog converter (DAC) to generate an analog output corresponding to a transmitted signal. The transmitter further includes an analog-to-digital converter (ADC) coupled to the DAC. The ADC measures the analog output of the DAC to identify a set of digital samples. The ADC identifies, from the set of digital samples, a set of valid samples, wherein each valid sample has a voltage within a voltage range. The ADC extracts one or more signal properties from the set of valid samples.

Abstract: Method and system for optimally equalizing distortion of an optical data channel carrying coherent optical signals with a given analog bandwidth B. A receiving end with IQ paths receives signals and a balanced detector detects signals in each path. The bandwidth of the detected signals is reduced by a factor of N by filtering the output of each path using an AAF with a cutoff frequency optimized to the analog bandwidth 2B/N of each path, where the AAF has deterministic attributes and introducing Known ISI. The signal is sampled at the AAF output by an ADC, at a sampling rate of 2B/N. The samples of each path are post-processed by a digital processor operating at a data rate of 2B/N, where post-processing represents the compensation of the distortion and the input data stream is reconstructed by optimally decoding the output of the processor using a decoder, which compensates the ISI.

Abstract: Method and system for optimally equalizing distortion of an optical data channel carrying coherent optical signals with a given analog bandwidth B. A receiving end with IQ paths receives signals and a balanced detector detects signals in each path. The bandwidth of the detected signals is reduced by a factor of N by filtering the output of each path using an AAF with a cutoff frequency optimized to the analog bandwidth 2B/N of each path, where the AAF has deterministic attributes and introducing Known ISI. The signal is sampled at the AAF output by an ADC, at a sampling rate of 2B/N. The samples of each path are post-processed by a digital processor operating at a data rate of 2B/N, where post-processing represents the compensation of the distortion and the input data stream is reconstructed by optimally decoding the output of the processor using a decoder, which compensates the ISI.