| 摘要 |
The embodiments of the present invention disclose a system, a method, and a device for polarization multiplexing. The method includes: splitting a polarization multiplexed optical signal into two optical signals, and performing the following operations respectively on the two optical signals: receiving the optical signal from one branch, rotating a state of polarization of the optical signal in the branch according to a state of polarization rotation control signal, and performing polarization beam splitting on the optical signal of which the state of polarization is rotated to obtain an optical signal with a single state of polarization; and searching for a control quantity according to the optical signal with the single state of polarization, tracking a minimum magnitude of the feedback signal of the control quantity, adjusting the control quantity based on a principle that the magnitude of the feedback signal is minimum, and determining the state of polarization rotation control signal according to the searched or adjusted control quantity. The method further includes: co-direction judgment: after judging that the similarity between the control quantities of the two optical signals meets a predetermined similarity criterion, enabling at least one of the two branches to re-search for the control quantity until the similarity between the control quantities of the two optical signals does not meet the predetermined similarity criterion. The preceding technical solution may substantially prevent the optical signals output by the two branches at a receiving end from having the co-directional state of polarization, without affecting the complexity and implementation cost of the system and the processing time delay of data signals at the receiving end.
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