PROBLEM TO BE SOLVED: To provide a PMD (polarization mode dispersion) generation device, capable of generating continuously variable first-order PMD, while generation of second-order PMD is suppressed, and is easy to mount and operates at a high speed and is easy to control.;SOLUTION: A PMD generation device 46 includes a polarization plane controller 12, a unit function block 48 including a first birefringent medium 14, a first mode mixer 16 and a second birefringent medium 18, a second mode mixer 20, and a reflecting mirror 22. An input optical signal 11-1 is input to the polarization plane controller and is adjusted into a state wherein a direction of a coordinate axis designating a main polarization state, which shows a direction of a polarization mode, and a direction of a crystal axis of the first birefringent medium are parallel with each other, and then is input to the first birefringent medium as an input optical signal 13-1. The input optical signal is reciprocated in an optical path passing the unit function block 46 and the second mode mixer 20 and reaching the reflecting mirror 22 to generate and out put a PMD- added optical signal 11-2 to which first-order PMD is added while generation of second-order PMD is suppressed.;COPYRIGHT: (C)2012,JPO&INPIT
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