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We develop a novel phasor monitor to obtain the constellation diagram from asynchronously sampled data measured by using the delaydetection technique. This phasor monitor consists of three parts; a phaseadjustment-free delay-interferometer, an optical front-end made of three photodetectors, and analog-to-digital (A/D) convertors, and a digital signal processor. We operate the A/D convertor at the sampling rate much slower than the symbol rate and acquire the data asynchronously. However,doi:10.1364/oe.18.021511 pmid:20941048 fatcat:nw5pierl4bdu7lm2ntjpp2eucy