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Hardware: Optical Vector Analyzer Problem: When I compare measurements (GD, PMD, etc) from the OVA text file to measurements that I process from the Jones Matrix data in the OVA text file, I do not get the same results. What is causing the difference? Solution: There are two main reasons that the measurements in the OVA text file may differ between calculated values: 1) removal of the common phase term and 2) filter settings. Common Term Removal The Jones Matrix Phase data that is saved to an OVA text file has a common phase term removed from all elements of the spreadsheet Jones Matrix. This common term is contained in the "Linear Phase Deviation" column of the spreadsheet file. You must add this phase term into the phase of each JM element to get the correct data for processing other parameters. For example, if you have the 4 Phase elements of the Jones Matrix (A, B, C, and D) and the linear phase term (P): Row 1: A1 B1 C1 D1 P1 You would add the Linear Phase Deviation term of each row, to all four JM phases of that row. So you essentially get: Row 1: A1+P1 B1+P1 C1+P1 D1+P1 After adding the linear phase deviation column into the Jones Matrix Phases, the data is then ready for processing.
After adding back the common phase term and removing the smoothing filter, you should have identical measurements and calculations. Related Links: Document ID: 04040076001 Other questions, contact LUNA SUPPORT |
