Calculating Group Delay and Chromatic Dispersion from OVA Optical Phase
Short Summary
The OVA calculations for GD and CD are presented, along with a straightforward way for the user to calculate these parameters, starting from the OVA optical phase measurement, with a user-defined optical frequency derivative step size.
Abstract
In the following note, the OVA calculations for GD and CD are presented, along with a straightforward way for the user to calculate these parameters, starting from the OVA optical phase measurement, with a user-defined optical frequency derivative step size. Example measurements are included that illustrate these calculations and practical considerations. It is shown that increasing the optical frequency derivative step size improves noise characteristics; however care must be taken to avoid suppression of actual device characteristics. Insight into the ideal derivative step size for a particular device is provided by inspecting the time domain impulse response. In general, the time domain window width should be set as tightly as possible about the impulse response, being careful to include the entire response. The resultant TDRBW is the maximum derivative step size appropriate for the device.
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