Patent ID: 6888624

Claim:
Method of obtaining accurate polarization dependent loss (PDL) and insertion loss (IL) measurement, taking into account every polarization disturbance having a transfer matrix in a line between generation of known states of polarization and a device under test (DUT), which comprises computing within a desired range of wavelengths the transfer matrix of each polarization perturbing element in the line between the generation of known states of polarization and the DUT using the following equation: â””S ij out â”˜=â””m ij â”˜â””S ij in â”˜ in which â””m ij â”˜ is the transfer matrix of the DUT, â””S ij out â”˜ is the output polarization matrix of each element, and â””S ij in â”˜ is the matrix of input state of polarization of each element, and compensating for errors introduced along the line by said polarization perturbing elements by correcting the above equation as follows: â””S ij out â”˜=â””m ij â”˜|perturbation 1 ||perturbation 2 | . . . â””S ij in â”˜ wherein |perturbation 1 |, |perturbation 2 | . . . are transfer matrices of each polarization perturbing element, thereby obtaining an accurate measurement of the PDL and the IL of the DUT.