Abstract: Systems and methods for restoring or recovering linear polarization state of an optical signal as it exits the far end of an optical fiber are disclosed. The optical signal may have an expected pattern of polarization states through a birefringent material of the optical fiber from a first node to a second node. The optical signal may be received by the second node and resulting polarization states may be measured. In certain non-limiting examples, the measured polarization states may be compared to expected polarization states to determine a characterization angle indicative of an axis of the optical fiber.

Abstract: Systems and methods for restoring or recovering linear polarization state of an optical signal as it exits the far end of an optical fiber are disclosed. The optical signal may have an expected pattern of polarization states through a birefringent material of the optical fiber from a first node to a second node. The optical signal may be received by the second node and resulting polarization states may be measured. In certain non-limiting examples, the measured polarization states may be compared to expected polarization states to determine a characterization angle indicative of an axis of the optical fiber.

Abstract: A fiber optic communication system including a fiber optic link, a transmitter system and a receiver system. The transmitter system includes a laser source producing a light beam, and a polarization controller receiving the light beam and providing an expected pattern of changing states of polarization to the light beam to output light signals into the fiber optic link to cause the expected pattern of changing states of polarization to be transmitted along the fiber optic link. The receiver system is provided with a polarization analyzer, and a light detector. The light detector receives the light signals transmitted by the transmitter, and forwards data indicative of the light signals to the polarization analyzer. The polarization analyzer analyzing the data with an inverse polarization reference frame and generates an alert based on deviations of the data from the expected pattern of changing states of polarization.