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Dispersion-tolerant clock recovery method and system

A clock recovery and dispersion technology, applied in the field of signal processing, can solve problems such as dispersion timing recovery jitter, and achieve the effect of large dispersion

Active Publication Date: 2022-07-08
SUN YAT SEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Still, residual dispersion may still exist and cause jitter in timing recovery

Method used

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  • Dispersion-tolerant clock recovery method and system
  • Dispersion-tolerant clock recovery method and system
  • Dispersion-tolerant clock recovery method and system

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Embodiment Construction

[0049] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0050] First, refer to figure 1 , an embodiment of the present invention provides a dispersion-tolerant clock recovery method, including:

[0051] Over-sampling the input dual-polarization optical signal to obtain sampled data;

[0052] Perform signal autocorrelation processing according to the sampled data to determine delay data points;

[0053] According to the delayed data points, the sampling data is shifted to obtain a first sequence and a second sequence;

[0054] The first autocorrelation sequence is determined by the first sequence, the second autocorrelation sequence is determin...

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Abstract

The invention discloses a dispersion-tolerant clock recovery method and system, provides improved square timing error detection of a cyclic autocorrelation function (CAF) based on a signal, promotes a classical corresponding function, shows larger dispersion tolerance, provides a timing error detection time domain solution of dispersion fault tolerance, and provides a clock recovery method and a clock recovery system of dispersion fault tolerance. The equivalence between the time error detection of the time domain and the frequency domain is re-established in a spectrum-dependent framework. According to the method, common square timing error detection is analyzed from the perspective of a cyclostationary theory, so that the problem of dispersion fault-tolerant timing error detection is naturally solved. By means of the solution, generalized square timing error detection is obtained, large dispersion can be tolerated, dispersion equalization does not need to be carried out in advance, and the method can be widely applied to the technical field of signal processing.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to a dispersion-tolerant clock recovery method and system. Background technique [0002] Coherent optical receivers equipped with analog-to-digital converters (ADCs) and digital signal processing (DSPs) have been the subject of intensive research. Coherent detection of optical signals provides excellent sensitivity and supports the use of complex modulation formats such as polarization division multiplexing (PDM) quadrature phase shift keying (QPSK) and hexadecimal quadrature amplitude modulation (16QAM). These modulation formats allow for exponential increases in optical communication capacity. Meanwhile, in coherent detection, linear transmission impairments such as chromatic dispersion (CD) and polarization mode dispersion (PMD) of the fiber can be equalized by digital signal processing. One of the core tasks of digital signal processing is to synchronize receivers an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/61
CPCH04B10/6161H04B10/6162
Inventor 王大伟梁国伟苏梓康李朝晖
Owner SUN YAT SEN UNIV
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