CROSS-REFERENCE TO RELATED APPLICATIONS

This application is based on and hereby claims priority to Chinese Application No. 201910183830.5, filed Mar. 12, 2019, in the State Intellectual Property Office of China, the disclosure of which is incorporated herein by reference.

FIELD

This disclosure relates to the field of optical communications, and in particular to a method and apparatus for monitoring the change of the state of polarization (SOP) and a receiver.

BACKGROUND

Dynamic optical networks occupy an important position in communication transmission networks due to their advantages such as high sensitivity, dynamically controllable routing, and flexible and variable capacities, etc. Optical performance detection is an indispensable technique for dynamic optical networks, which is capable of effectively monitoring changes of various parameters of optical communication system, so as to monitor and control the optical communication system in a real-time manner to make it work in an optimal state.

By monitoring the change of state of polarization, it is possible to effectively discover and distinguish risk events, such as fiber bending, jitter, and hits, etc.

It should be noted that the above description of the background is merely provided for clear and complete explanation of this disclosure and for easy understanding by those skilled in the art. And it should not be understood that the above technical solution is known to those skilled in the art as it is described in the background of this disclosure.

SUMMARY

According to an embodiment of this disclosure, there is provided a method for monitoring the change of state of polarization, including where a matrix of equalization filter tap coefficients of a receiver is extracted; an FFT operation of N taps is performed on each path of equalization filter tap coefficients of the matrix to obtain a converted matrix, a sum of each path of equalization filter tap coefficients of the converted matrix being a value of non-zero frequency; and an amount of change of state of polarization is estimated by using at least one path of equalization filter tap coefficients of the converted matrix.

According to an embodiment of this disclosure, there is provided an apparatus for monitoring the change of state of polarization, wherein the apparatus includes a memory and a processor coupled to the memory.

The processor is configured to extract a matrix of equalization filter tap coefficients of a receiver; perform an FFT operation of N taps on each path of the matrix of equalization filter tap coefficients to obtain a converted matrix, a sum of each path of equalization filter tap coefficients of the converted matrix being a value of non-zero frequency; and estimate an amount of change of state of polarization by using at least one path of equalization filter tap coefficients of the converted matrix.

According to an embodiment of this disclosure, there is provided a receiver, including the apparatus as described in the second aspect.

According to an embodiment of this disclosure, there is provided a computer readable program, which, when executed in a receiver, will cause the receiver to carry out the method as described herein.

According to an embodiment of this disclosure, there is provided a medium, including a computer readable program, which will cause a receiver to carry out the method as described herein.

With reference to the following description and drawings, the particular embodiments of this disclosure are disclosed in detail, and the principle of this disclosure and the manners of use are indicated. It should be understood that the scope of the embodiments of this disclosure is not limited thereto. The embodiments of this disclosure contain many alternations, modifications and equivalents within the scope of the terms of the appended claims.

Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments and/or in combination with or instead of the features of the other embodiments.

It should be emphasized that the term “comprises/comprising/includes/including” when used in this specification is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps, components or groups thereof.

