PCD-003 and PCD-004 use a breakthrough all-fiber technology to effectively randomize polarization states. Depolarizing by polarization scrambling can remove measurement uncertainties caused by the polarization sensitivity of the fiber sensing system. Based on a patented, award-winning all-fiber technology, PCD-003 and PCD-004 deliver superior performance with extremely low insertion loss, back reflection and residual phase and amplitude modulation. The PCD-004 integrates a microprocessor for easy remote control for customer to get the optimum performance.