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We report on several versions of the calibration and monitoring systemdedicated to scintillator tile calorimeters built within the CALICEcollaboration and intended for future linear collider experiments. Whereas thefirst, a 1 m3 analogue hadron calorimeter prototype, was already built andtested in beam, second-technological prototype-is currently being developed.Both prototypes are based on scintillating tiles that are individually read outby new photodetectors, silicon photomultipliers (SiPMs). Since the SiPMresponse shows a strong dependence on the temperature and bias voltage and theSiPM saturates due to the limited number of pixels, it needs to be monitored.The monitoring system has to have sufficient flexibility to perform severaldifferent tasks. The self-calibration property of the SiPMs can be used for thegain monitoring using a low intensity of the LED light. A routine monitoring ofall SiPMs during test beam operations is achieved with a fixed-intensity lightpulse. The full SiPM response function is cross-checked by varying the lightintensity from zero to the saturation level. We concentrate especially on thelast aspect - the high dynamic range.

Calibration System with Optical Fibers for Calorimeters at Future Linear Collider Experiments