FAQs: ER Measurement
●A: Several General Photonics instruments can measure the polarization extinction ratio of a light source or PM fiber component or system. The ERM-202 polarization extinction ratio meter is a dedicated PER measurement instrument that uses the rotating polarizer method. The POD-201 and PSY-201 polarimeters and the PSGA-101A polarization measurement system can measure PER using the polarimeter method. The PXA-1000 distributed polarization crosstalk analyzer can also measure PER by measuring all crosstalk events that contribute to the PER.
■Q:What is the operating principle of the polarization extinction ratio (PER) meter?
●A: The ERM-202 polarization extinction ratio meter is composed of a rotating polarizer with ultra high PER and a photodetector circuit with low polarization dependent responsivity and very high dynamic range. For every polarizer rotation cycle, the PER meter measures the maximum power Pmax and minimum power Pmin, and calculates and displays the polarization extinction ratio PER=10 log(Pmax/Pmin) and input light power P=Pmax+Pmin. The displayed angle is the orientation angle of the internal polarizer, with respect to the connector key, at which maximum power is detected during each polarizer rotation cycle. Looking into the connector, an angle rotated counterclockwise from the key slot is positive.The 2-input version can measure the ER of two light paths at once and can also compare the power ratio of the two outputs, making it a good choice for characterizing PM components such as PM couplers.
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polarization extinction ratio meter 、 polarimeters 、 polarization measurement system 、 distributed polarization crosstalk analyzer |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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2020/8/6 |
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565 KB |
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