Error sources of chromatic dispersion measurement in dispersion compensating grating

Describes the most important error sources in chromatic dispersion measurements on DCG (dispersion compensating grating). Laser behaviour is an important point to achieve a detailed characterization of group delay ripples. We have measured the group delay response and the existing ripple. The group delay measurements can be influenced by different factors. In our measurements we have identified six different error sources, namely thermal and shot noise, temperature, vibrations, wavelength step accuracy, laser oscillations, and modulation frequency.