Differential Group Delay Line (DGD)

The Phoenix Photonics differential group delay (DGD) line utilises a compact high linear birefringence fiber to provide an accurate fixed differential delay. Based on the technology developed to manufacture high performance Lyot depolarizers, precise differential time delay coils are fabricated. Time delays can be selected from fixed delays to customer selectable delays. The Phoenix DGD boasts many features including an all-fiber design, passive operation and low insertion loss. The DGD unit is commonly used in PMD compensation applications, sensing and PMD emulators.