Crosstalk calibration of multi-pixel photon counters using coherent   states
  We present a novel method of calibration of crosstalk probability for multi-pixel photon counters (MPPCs) based on the measurement of the normalized second-order intensity correlation function of coherent light. The method was tested for several MPPCs, and was shown to be advantageous over the traditional calibration method based on the measurements of the dark noise statistics. The method can be applied without the need of modification for different kinds of spatially resolved single photon detectors. 
Dmitry A. Kalashnikov, Si-Hui Tan, and Leonid A. Krivitsky
quant-ph physics.ins-det