Autocorrelation bit error detection device and method for optical signal by optical branching method

摘要

To improve the performance for measuring autocorrelation bit errors of optical signals to be measured, an autocorrelation-bit-error detection apparatus of the present invention using an optical branch system first has an optical branch unit for branching an optical signal to be measured into a plurality of branched optical signals, a plurality of light-to-electricity converters for converting a plurality of branched optical signals supplied from the optical branch unit into electrical signals, a plurality of decision circuits for deciding relations between the electrical signals supplied from the light-to-electricity converters and their threshold values, and a detector for detecting autocorrelation bit errors of the optical signal to be measured in accordance with comparison results between the decision circuits.