Chromatic dispersion and DGD measurement of air-guiding photonic bandgap fibers

The basic properties including physical properties and absorption spectrum were measured firstly. Then the chromatic dispersion of air-guiding photonic band-gap fibers (PBGF) was measured with phase-shift method and pulse delay method, from experimental results we can see that their test results are accordant. The differential group delay (DGD) of the PBGF was also measured with a method of Sagnac interferometer. We found that the DGD is in direct proportion to its chromatic dispersion.