  Compton telescope is a promising technology to achieve very high sensitivity
in the soft gamma-ray band (0.1-10 MeV) by utilizing Compton kinematics.
Compton kinematics also enables polarization measurement which will open new
windows to study gamma-ray production mechanism in the universe. CdTe and Si
semiconductor technologies are key technologies to realize the Compton
telescope in which their high energy resolution is crucial for high angular
resolution and background rejection capability. We have assembled a prototype
module using a double-sided silicon strip detector and CdTe pixel detectors. In
this paper, we present expected polarization performance of a proposed mission
(NeXT/SGD). We also report results from polarization measurements using
polarized synchrotron light and validation of EGS4 MC simulation.
