Patzak, E.E.PatzakMeissner, P.P.Meissner2022-03-022022-03-021988https://publica.fraunhofer.de/handle/publica/175485The authors investigate the influence of IF-filtering on the bit error rate floor in optical DPSK-systems; this influence is usually neglected. They show that the IF-filtering leads to a reduction of the error rate floor, so that the linewidth requirements are reduced by a factor of 0.68.enoptical linksoptical modulationphase shift keyingsignal detectionspatial filtersdelay phase shift keyingif-filteringbit error rate floorcoherent optical dpsk-systems621journal article