Interrogation of an integrated optic modulator over a low-birefringence fiber using polarization tracking

The remote operations of an integrated optic Mach-Zehnder modulator via a low-birefringence fiber link using an input polarization control scheme is demonstrated. The polarization tracking scheme actively maintains the state of polarization arriving at the modulator in the state required for optimum operation of the device. As the feedback signal is determined by the overall optical throughput of the modulator, no modulation is itself required for the modulator to be set for optimum performance.>