Proceedings PaperPer-port statistical estimation of bit error rate and optical signal-to-noise ratio in DWDM telecommunications
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In telecommunications, the incoming information signal is susceptible to attenuation, noise and jitter. Bit error rate, Q-factor, and signal to noise ratio are three key parameters that determine channel performance. Typical error detecting and correcting codes detect up to sixteen errors and correct up to eight within a block of information. Although this method monitors each channel without service interruption, the detection code has a limited error detection capability and requires several frames (or packets) to estimate bit error rate and thus it takes a relatively long time. Another method is based on “eye diagrams”; however, this requires costly equipment and off-line measurements in addition to service interruption. In this paper, we describe the mathematical background of statistical estimation of eye-diagrams and we present a circuit that automatically estimates BER, SNR, and Q-factor at each port without service interruption. This method is based on statistical sampling and therefore estimates are made in short intervals. In addition, we describe the functional block of a VLSI circuit that estimates the aforementioned performance parameters.