In regard to device null optical fiber type link for compensating or emulation

摘要

Or compensation of PMD effect that occurs in the optical signal transmitted through the fiber-optic link above apparatus for emulation (14), a device for the polarization conversion and (15 to 18) that can be controlled birefringent part (19 to 22) I include the door. Wherein a part or birefringent optical element, one of the polarization conversion controllable devices described above, but each part is preceded rear . And there are at least three, one birefringent part (15 to 18) has a propagation delay different from the other parts at least of these. PMD output, and, the apparatus includes a (24) detector for the control (19 to 22) controllable devices for adjusting the feedback. [Selection] Figure Figure 1