A method and device for monitoring polarization mode dispersion
A polarization mode dispersion, orthogonal polarization technology, applied in the field of communication, can solve the problems of complex and inconvenient implementation of algorithms, and achieve the effect of convenient management and operation, and reliable information source
Active Publication Date: 2019-05-24
HUAWEI TECH CO LTD
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Problems solved by technology
[0009] The present invention provides a method and device for monitoring polarization mode dispersion. The method and device provided by the present invention solve the problem that the existing methods for monitoring polarization mode dispersion have complex algorithms and are inconvenient to implement
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[0078] like Image 6 As shown, an embodiment of the present invention provides a method for monitoring polarization mode dispersion, and the method specifically includes:
[0079] In this embodiment, after the optical signal to be measured is mixed with the first signal and the second signal, the upper sideband signal (ie the first analog electrical signal) and the lower sideband signal (ie the second analog electrical signal) are obtained; After the band signal and the lower sideband signal are converted, the polarization mode dispersion can be obtained through the relevant mathematical operations (the specific implementation principle is as follows: Figure 7 shown).
[0080] Step 601, a first analog electrical signal obtained by coherently mixing the optical signal to be measured and a first optical signal; a second analog electrical signal obtained by coherently mixing the optical signal to be measured and a second optical signal; wherein, The center frequencies of the f...
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The present invention discloses a method and device for monitoring polarization mode dispersion. The method comprises: performing coherent mixing on an optical signal under test with a first optical signal and a second optical signal to obtain a first analog electrical signal and a second analog electrical signal, wherein a center frequency difference between the first optical signal and the second optical signal is equal to a baud rate; converting the first analog electrical signal and the second analog electrical signal into a first digital electrical signal and a second digital electrical signal, wherein the first digital electrical signal and the second digital signal both comprise two orthogonal polarization information pieces; converting the first digital electrical signal and the second digital electrical signal into a first Stokes vector and a second Stokes vector; computing, in a spherical coordinate system, an average rotational angle for the first Stokes vector and the second Stokes vector; and computing polarization mode dispersion according to the average rotational angle. The method and device disclosed in the present invention address the problem in which a complicated algorithm difficult to be implemented is employed in the existing methods of monitoring polarization mode dispersion.
Description
technical field [0001] The present invention relates to the technical field of communications, and in particular, to a method and device for monitoring polarization mode dispersion. Background technique [0002] With the increasing demand for data services, large-capacity and high-speed optical fiber transmission networks have gradually become the main direction of information transmission. In order to better manage and monitor the optical network, among many monitoring parameters, polarization mode dispersion (Polarization Mode Dispersion, PMD) is an important parameter that can reflect the operating state of the optical network. [0003] Polarization mode dispersion refers to the polarization dispersion in the fiber. When a signal pulse is transmitted along an ideal symmetrical circular single-mode fiber without external interference, the optical pulse input by the fiber can be divided into two vertical polarization output pulses, with the same The two pulses are superimp...
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IPC IPC(8): H04B10/079
CPCH04B10/07
Inventor 李朝晖隋琪王大伟
Owner HUAWEI TECH CO LTD