Method for separating polarization multiplexing signals on the basis of optical interference effect

Abstract

The invention relates to a method for separating polarization multiplexing signals on the basis of optical interference effect. The method comprises the following steps of: regulating the polarization state of signal light in two polarization channels of a receiving end by using a polarization controller; controlling the polarization controller by detecting the change law of intensity of any path of output light of a polarizing beam splitter; selecting one path of output light of the polarizing beam splitter, splitting the light and using the light as monitoring light; observing the change rate of the intensity of the monitoring light; and regulating the polarization controller to split the two polarization multiplexing channels when the change rate of the intensity of the monitoring light is minimum so that the function of polarization demultiplexing can be achieved. The method carries out demultiplexing by using the optical coherence of the two polarization multiplexing channels on the basis of the optical interference effect and has no requirement for power difference of the two polarization multiplexing channels.

Description

technical field [0001] The invention relates to polarization demultiplexing in an optical fiber transmission system, in particular to a method for separating polarization multiplexing signals based on optical interference effects. It is a new method of polarization demultiplexing. Background technique [0002] In the working mode of the polarization multiplexing system, when a wavelength is transmitted in the optical fiber, it carries two orthogonally polarized optical signals, which doubles the amount of information carried by the light under the condition of one wavelength, and polarization multiplexing is required at the receiving end. Signal separation to distinguish the two channels of polarization multiplexing. Existing patents propose to use the power difference method to demultiplex the polarization multiplexed signal at the receiving end. Since this method requires the polarization multiplexed two polarization channels to be optically decoherent, and requires that ...

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Problems solved by technology

The existing patent proposes to use the power difference method to demultiplex the polarization multiplexed signal at the receiving end. Since this method requires the polarization multiplexed two polarization channels to be optically decoherent, and the optical power of the two polarization channels must be different, it limits occasions of use

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