METHOD FOR MEASURING DIFFERENTIAL GROUP DELAY OF AN OPTICAL LINK

摘要

The invention concerns a device for measuring differential group delay T₁ in an optical link. In accordance with the invention, the device comprises: in input of said link, a generator (10) for a binary signal sequence at a rate D and a first polarization controller (30) for performing a first scanning of the polarizing states applied to the binary signal of an incoming sequence; in output of said link, a second polarization controller (60) for performing a second scanning of the polarizing states applied to the signal to the signal resulting from the outgoing sequence independently of said first polarizing scanning; an differential group delay emulator (70) for introducing an additional variable differential group delay T₂, and an analyzing device (90) for determining the equality between T₁ + T₂₌1/D on the resulting signal sequence. The invention is applicable to fiber-optic metrology.