Equalization method and equipment in extreme scenarios in coherent optical fiber polarization division multiplexing system

A polarization division multiplexing and scene technology, applied in polarization multiplexing systems, optical fiber transmission, transmission systems, etc., can solve the problems of fast RSOP, only partial compensation, and inability to compensate for optical signal damage.

CN107809282BActive Publication Date: 2019-08-16BEIJING UNIV OF POSTS & TELECOMM +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2019-08-16

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Abstract

The invention provides an equilibrium method and equipment under an extreme scene in a coherent optical fiber polarization-division multiplexing system. The method comprises the following steps: performing segmented construction on an optical fiber channel with rotation of state of polarization RSOP and polarization division multiplexing PMD joint effect to acquire a signal damage model with two segments of equivalent structures of the PMD before the RSOP; performing window-split interception on a damage signal symbol sequence passing through the optical fiber channel to acquire a window-splitsignal; performing the PMD compensation on the PMD damage of the window-split signal at the frequency domain by using the Kalman filter equilibrium algorithm, and performing the RSOP compensation onthe RSOP damage of the window-split window at the time domain. Under the situations that the speed of the RSOP reaches up to million radians per second and the differential group delay of the PMD is multiple times of the symbol period, the equilibrium compensation work of the signal is finished; the error vector amplitude is much less than the forward error correction tolerance, and performs wellalong the optical signal-to-noise ratio change.
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Description

technical field

[0001] Embodiments of the present invention relate to the technical field of communications, and more specifically, to an equalization method and equipment in extreme scenarios in a coherent optical fiber communication polarization division multiplexing system. Background technique

[0002] Driven by the explosive growth of Internet services, optical communication systems and networks as the transmission backbone network have also developed rapidly. The emergence of technologies such as time division multiplexing (TDM), wavelength division multiplexing (WDM), polarization multiplexing (Polarization division multiplexing, PDM) and high-order modulation formats have greatly improved the capacity of optical communication systems and spectral efficiency. Polarization effects, such as polarization state change (also known as polarization rotation, Rotation of state of polarization, RSOP), polarization mode dispersion (Polarization mode dispersion, PMD), polarizat...

Examples

Embodiment Construction

[0049] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0050] figure 1 It is a schematic flow chart of an equalization method in an extreme scenario in a coherent optical fiber communication polarization division multiplexing system according to an embodiment of the present invention, as shown in figure 1 As shown, an equalization method in extreme scenarios in a coherent optical fiber communication polarization division multiplexing system includes:

[0051] S100, segmenting the optical fiber channel with the joint effect of polarization rotation RSOP and polarization mode dispersion PMD to obtain a signal damage model of an equivalent two-stage structure first with RSOP and then with PMD;

[0052] In the embodiment of the ...