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Polarization change tracking device, received signal processing device and method

A technology for receiving signals and tracking devices, applied in the field of communications, can solve the problems of AEQ performance degradation, AEQ performance degradation, complex polarization changes, etc., to achieve the effects of continuous response, avoiding system performance degradation, and rapid polarization changes

Pending Publication Date: 2022-08-09
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the optical fiber link is affected by lightning strikes, etc., a fast RSOP of Mrad level will be generated, and the performance of AEQ will be significantly reduced
When both RSOP and polarization dependent loss (PDL) exist in the link, the total polarization change will be very complicated, and the performance of AEQ will be further degraded

Method used

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  • Polarization change tracking device, received signal processing device and method
  • Polarization change tracking device, received signal processing device and method
  • Polarization change tracking device, received signal processing device and method

Examples

Experimental program
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Embodiment 1

[0034] An embodiment of the present application provides a polarization change tracking device. For example, the device is provided at an optical receiver end of an optical communication system. The device can be integrated in the optical receiver, or can be set as an independent device.

[0035] figure 1 It is a schematic diagram of the polarization change tracking device according to the first embodiment of the present application. like figure 1 As shown, the polarization change tracking device 100 includes:

[0036] a first estimation unit 101, which is used for estimating the polarization change speed in the link according to the received signal;

[0037] The first setting unit 102, which is used for setting the response coefficient of polarization tracking according to the relationship between the estimated polarization change speed and the preset value, so that the response of polarization tracking and the response of adaptive equalization are continuous; and

[0038]...

Embodiment 2

[0165] An embodiment of the present application further provides a processing apparatus for a received signal. The processing apparatus for a received signal includes the polarization change tracking apparatus according to Embodiment 1. For the specific structure and function of the polarization change tracking apparatus, reference may be made to Embodiment 1. records, and will not be repeated here.

[0166] Figure 11 It is a schematic diagram of the apparatus for processing a received signal according to Embodiment 2 of the present application. like Figure 11 As shown, the processing apparatus 1100 for receiving signals includes:

[0167] A polarization change tracking device 100 that outputs a received signal after polarization change compensation; and

[0168] The adaptive equalizer 200 is configured to perform adaptive equalization processing on the received signal after polarization change compensation, to obtain an adaptively equalized signal.

[0169] In this embo...

Embodiment 3

[0173] An embodiment of the present application further provides an optical receiver, where the optical receiver includes the polarization change tracking device according to Embodiment 1 or the received signal processing device according to Embodiment 2, the polarization change tracking device or For the specific structure and function of the apparatus for processing the received signal, reference may be made to the descriptions in Embodiment 1 and Embodiment 2, and details are not repeated here.

[0174] The description will be given by taking the optical receiver including the processing apparatus for receiving signals according to Embodiment 2 as an example.

[0175] Figure 12 This is a schematic block diagram of the system configuration of the optical receiver according to Embodiment 3 of the present application. like Figure 12 As shown, the optical receiver 1200 includes a polarization change tracking device 100 and an adaptive equalizer 200 .

[0176] like Figure...

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Abstract

The embodiment of the invention provides a polarization change tracking device and a received signal processing device and method. The polarization change tracking method comprises the following steps: estimating a polarization change speed in a link according to a received signal; setting a response coefficient of polarization tracking according to the relationship between the estimated polarization change speed and a preset value, so that the response of polarization tracking is continuous with the response of adaptive equalization; and carrying out polarization change compensation on the received signal according to a set polarization tracking response coefficient.

Description

technical field [0001] The present application relates to the field of communication technology. Background technique [0002] Coherent optical communication system occupies an important position in communication transmission network with the advantages of huge transmission bandwidth, great expansion potential, extremely low transmission loss and low cost. In coherent optical communication systems, polarization multiplexing technology can increase the communication capacity. [0003] Currently, for coherent optical receivers, adaptive equalization (AEQ) is usually used to implement polarization demultiplexing. Commonly used AEQ algorithms, such as constant modulus algorithm (CMA) and direct decision-directed least mean square (DD-LMS), can usually handle tens to hundreds of krads in the link. Rotation of state of polarization (RSOP). When the optical fiber link is affected by lightning strikes, etc., a fast RSOP of Mrad magnitude will be generated, and the performance of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/61
CPCH04B10/6162H04B10/6166H04J14/06
Inventor 李静楠樊洋洋陶振宁
Owner FUJITSU LTD
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