  We propose and study a method of optical crosstalk suppression for silicon
photomultipliers (SiPMs) using optical filters. We demonstrate that attaching
absorptive visible bandpass filters to the SiPM can substantially reduce the
optical crosstalk. Measurements suggest that the absorption of near infrared
light is important to achieve this suppression. The proposed technique can be
easily applied to suppress the optical crosstalk in SiPMs in cases where
filtering near infrared light is compatible with the application.
